Conveners
Parallel Session: Parallel Session 1-A
- Youngjoon Kwon (Yonsei University)
Parallel Session: Parallel Session 1-B
- Atsushi Hosaka (Osaka University)
Parallel Session: Parallel Session 2-B
- Yongsun Kim (Sejong University)
Parallel Session: Parallel Session 2-A
- Seung-il Nam (Pukyong National University)
Parallel Session: Parallel Session 3-A
- Wayne Polyzou (University of Iowa)
Parallel Session: Parallel Session 3-B
- James Vary (Iowa State University)
Parallel Session: Parallel Session 4-A
- Jiunn-Wei Chen (National Taiwan University)
Parallel Session: Parallel Session 4-B
- Xingbo Zhao (IMP, CAS)
Parallel Session: Parallel Session 5-B
- Cédric Lorcé (Ecole polytechnique)
Parallel Session: Parallel Session 5-A
- Kirill Semenov-Tian-Shansky (PNPI)
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Farid Salazar (UCLA)30/11/2021, 13:30Contributed talk
Measurements of azimuthal correlations in the production of forward dijets in deep inelastic scattering provide the opportunity to probe the Weizsäcker-Williams gluon transverse momentum dependent (TMD) parton distribution, and the possibility for the discovery of gluon saturation at the future Electron-Ion Collider (EIC). While the TMD factorization is expected to hold near back-to-back...
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Junhao Yin (Korea University)30/11/2021, 13:30Contributed talk
The Belle II experiment at the SuperKEKB energy-asymmetric e+e− collider is an upgrade of the B factory facility at KEK in Tsukuba, Japan. The experiment began operation in 2019 and aims to record a factor of 50 times more data than its predecessor. Belle II is uniquely capable of studying the so-called "XYZ" particles: heavy exotic hadrons consisting of more than three quarks. First...
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Kazuki Kojima (Nagoya University)30/11/2021, 13:50Contributed talk
In the recent years, several measurements of B-decays with flavor changing neutral currents, i.e. $b \to s$ transitions hint at deviations from the Standard Model (SM) predictions. In addition there are discrepancies with the SM predictions in $ b \to c \tau \nu$ decays. The Belle II experiment is a substantial upgrade of the Belle detector and operates at the SuperKEKB energy-asymmetric...
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Ahmad Jafar Arifi (APCTP)30/11/2021, 13:50Contributed talk
In recent years, the radial excitations of heavy hadrons have been identified in experiments. Motivated by that, we have studied their decay properties in the nonrelativistic constituent quark model. It is found that the relativistic correction is essential to explain the large decay width indicating that the relativistic model may be necessary. In this talk, we will discuss our attempt to...
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Chao Shi (Nanjing University of Aeronautics and Astronautics)30/11/2021, 14:10Contributed talk
The light front wave functions (LFWFs) are conventionally obtained by solving the light-cone QCD Hamiltonian. In this talk, I'll demonstrate an alternative approach, which is to extract the leading Fock-state LFWFs (LF-LFWFs) of light and heavy pseudo-scalar and vector mesons from their dynamically solved Bethe-Salpeter wave functions. An important property of these LF-LFWFs is that they imply...
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Shung-Ichi Ando (Sunmoon University )30/11/2021, 14:10Contributed talk
We discuss an application of the cluster effective field theory (EFT) to nuclear reactions at low energies. A target reaction of the present talk is the $E1$ transition of radiative $\alpha$ capture on $^{12}$C, which is a fundamental reaction in nuclear-astrophysics. We review our recent works to construct the cluster EFT for the reaction, fix some of the coupling constants of the effective...
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Sreeraj Nair (The Institute of Modern Physics, Chinese Academy of Sciences)30/11/2021, 14:30Contributed talk
We present the generalized parton distributions (GPDs) of the pion and the kaon in both momentum and position spaces within the basis light-front quantization framework. We obtain these GPDs for the valence quarks from the eigenvectors of a light-front effective Hamiltonian in the valence Fock sector consisting of the holographic quantum chromodynamics (QCD) confinement potential, a...
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Wenyang Qian (Iowa State University)30/11/2021, 14:30Contributed talk
Following our previous work (W. Qian, S. Jia, Y. Li and J.P. Vary, Phys. Rev. C 102, 055207 (2020); arXiv:2005.13806) on light unflavored mesons as a relativistic bound-state problem within the nonperturbative Hamiltonian formalism, we present the numerical calculations on simulated quantum devices using the basis light-front quantization (BLFQ) approach. We implement and compare the...
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Kamil Serafin (Institute of Modern Physics CAS)30/11/2021, 14:50Contributed talk
We present the first results of all-charm tetraquark calculations using many-body basis function approach in the Front Form of Hamiltonian dynamics known as Basis Light-Front Quantization (BLFQ). We numerically find masses of the ground-state tetraquark and three estimates of the lowest two-meson threshold. All degrees of freedom of each quark and antiquark are explicitly taken into account....
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Parada Hutauruk (Pukyong National University)30/11/2021, 14:50Contributed talk
In this talk we study the valence quark and gluon distributions of the pion and kaon in the Nambu-Jona-Lasinio (NJL) model with the help of the proper-time regularization (PTR) scheme that simulates confinement. We then explore the gluon contents of the pion and kaon, that recently attract more attention of hadronic physicist. A comparison with other model and lattice predictions as well as...
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Kihoon Hong (Inha University)30/11/2021, 15:10Contributed talk
The structure of charmonia is usually described by two important physics: Coulomb-like potential arising from one-gluon exchange and quark-confining one to keep the quarks inside charmonia. However, the strength of the strong coupling constant often employed in this potential approach is known to be overestimated. While the effects from the instanton, which is one of the most well-known...
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Zhanwen Zhu (University of Chinese Academy of Sciences)30/11/2021, 15:10Contributed talk
We present recent results of transverse single-spin asymmetries (TSSAs) for inclusive neutral pions using the Forward Meson Spectrometer at STAR in proton-proton collisions at center of mass energies of 200 and 500 GeV. The results from the two energies show that the pion TSSA increases continuously with Feynman-$x$. Comparisons with previous measurements show that the pion TSSA is mostly...
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Zhi Hu (IMPCAS)30/11/2021, 15:25Contributed talk
Basis Light-front Quantization is a method starting from the first-principle Lagrangian to simultaneously get the mass spectrum and internal information of many bound states within a feasible computation time. Among the internal information of bound states, transverse-momentum-dependent PDFs (TMDs) have received increasing attention recently because they provide a full momentum space 3D...
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Bolun Hu (Institute of Modern Physics, Chinese Academy of Sciences)30/11/2021, 15:30Contributed talk
We inverstigate the electron-positron pair production in electric fields with spatio-temporal inhomogeneity using a Hamiltonian method based on light-front quantization. We truncate the Fock space up to the sector containing $4$ pairs of electrons and positrons, by which we can track each particle fully quantum-mechanically. We calculate observables such as the invariant mass and the...
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Yuson Jun (Inha University)30/11/2021, 15:40Contributed talk
A chiral quark-soliton model (CQSM) is a relativistic pion mean-field approach in the large $N_{c}$ limit, which describes baryon as a bound state of the $N_{c}$ valence quarks by the pion mean field. In the infinitely heavy mass limit of the heavy quark, a singly heavy baryon can be viewed as an $N_{c}-1$ chiral soliton with the heavy quark as a static color source. In this framework, we...
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Sudeep Saha (Indian Institute of Technology)30/11/2021, 15:45Contributed talk
We study the gravitational form factors (GFFs) and the mechanical properties like the pressure and shear distributions inside a relativistic spin-$\frac{1}{2}$ composite object like a quark dressed with a gluon, using light-front wave functions. Using the symmetric energy-momentum tensor for QCD, we calculate the analytical expression for the four GFFs $A(q^2)$, $B(q^2)$, $C(q^2)$ and...
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Sungsik Noh (Yonsei University)01/12/2021, 13:30Contributed talk
We improve our previous variational method based nonrelativistic quark model by introducing a complete set of three-dimensional harmonic oscillator bases as the spatial part of the total wave function. After fitting to the masses of the ground state hadrons, we apply our new method to analyzing the doubly heavy tetraquark states $qq'\bar{Q}\bar{Q'}$. In particular, we compare the result for...
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Sungtae Cho (Kangwon National University)01/12/2021, 13:30Contributed talk
We discuss multi-charmed and exotic hadrons in heavy ion collisions by focusing on their production based on both the statistical and coalescence models. Starting from the investigation on estimated yields of multi-charmed hadrons in the statistical hadronization model, we consider transverse momentum distributions of those hadrons produced at quark-hadron phase transition in the coalescence...
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Zhuoran Huang (APCTP)01/12/2021, 13:45Contributed talk
We perform a sensitivity study of an un-binned angular analysis of the $B\to D^*\ell \nu_\ell$ decay, including the contributions from the right-handed current. We show that the angular observable can constrain very strongly the right-handed current without the intervention of the yet unsolved $V_{cb}$ puzzle.
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Denny Sombillo (RCNP, Osaka University and NIP University of the Philippines Diliman)01/12/2021, 13:50Contributed talk
Experimental results from hadron-hadron scatterings or decays are usually interpreted by using some phenomenological models. The conventional model-fitting scheme cannot give us a definitive answer because different models can give almost similar goodness of fit. In our work, we show that deep learning can be used as a unified model-selection tool. We prepared 35 pole-based models and train...
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Usha Kulshreshtha (Kirori Mal College, University of Delhi)01/12/2021, 14:05Contributed talk
In this talk, I would consider the light-front quantization of the Maxwell Chern-Simons Higgs theory using the Hamiltonian and path integral formulations.
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Yang Li (University of Science and Technology of China)01/12/2021, 14:10Contributed talk
We investigate the two-photon transitions $c\bar c \to \gamma^*\gamma$ of the charmonium system in light-front dynamics. The light-front wave functions were obtained from solving the effective Hamiltonian based on light-front holography and one-gluon exchange interaction within the basis light-front quantization approach. We compute the two-photon transition form factors as well as the...
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Hyeon-Dong Son (CENuM, Korea University)01/12/2021, 14:25Contributed talk
We present our recent studies on the quasi-parton distribution functions in the nucleon within the chiral quark-soliton model. We discuss the properties of the isoscalar unpolarized and isovector polarized quasi-PDFs in the large $N_c$ limit, such as the generalized sum-rules and the nucleon momentum evolutions. From the model calculations, we observe that the isoscalar unpolarized quasi quark...
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Lata Thakur (APCTP)01/12/2021, 14:30Contributed talk
We will discuss the effects of bulk viscous quark gluon plasma medium on the quarkonium spectral functions. The bulk viscous correction is incorporated in the distribution functions of thermal quarks and gluons, with which we compute the dielectric permittivity. The modified dielectric permittivity is used to calculate the in-medium heavy quark potential. Using the modified heavy quark complex...
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Ulugbek Yakhshiev (Inha University)01/12/2021, 14:45Contributed talk
We discuss in detail the basic ideas behind the medium modifications of the chiral soliton models. We also demonstrate their applications to study an in-medium baryon properties in different (heavy, light) sectors, nuclear matter properties in different (low, ordinary, high, extreme) density regions, the finite nuclei properties and related phenomena.
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Huimin Yang (Beihang University)01/12/2021, 14:50Contributed talk
We investigate $P$-wave bottom baryons of the $SU(3)$ flavor $\mathbf{6}_F$, and systematically study their $D$-wave decays into ground-state bottom baryons and pseudoscalar mesons. a rather complete study is performed on both mass spectra and decay properties of $P$-wave bottom baryons, using the method of QCD sum rules and light-cone sum rules within the framework of heavy quark effective...
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Jisu Kim (Yonsei University)01/12/2021, 15:05Contributed talk
We calculate the masses of the vector and axial-vector mesons, as well as the nucleon and the delta resonance in the chiral symmetry, restored vacuum. This is accomplished by separating the quark operators appearing in the QCD sum rules for these hadrons into the chiral symmetric and symmetry breaking parts depending on the contributions of the fermion zero modes. We then extract the vacuum...
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Chandan Mondal (Institute of Modern Physics, Chinese Academy of Sciences)01/12/2021, 15:10Contributed talk
We obtain the distribution amplitude (DA) of the pion from its light-front wave functions in the basis light-front quantization framework. This light-front wave function of the pion is given by the lowest eigenvector of a light-front effective Hamiltonian consisting a three-dimensional confinement potential and the color singlet Nambu--Jona-Lasinion interaction both between the constituent...
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Samson Clymton (Inha University)01/12/2021, 15:20Contributed talk
In the present talk, we will show how the axial-vector meson $a_1(1260)$ emerges as a quasi-bound state consisting of the kaon and anti vector kaon or a hadronic molecular state. We first construct a dynamical model for $\pi\rho$ scattering based on the fully off-mass-shell coupled-channel formalism. The model includes both the $\pi\rho$ and $K\bar{K}^*$ channel. The axial-vector meson...
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Tiancai Peng (Lanzhou University)01/12/2021, 15:30Contributed talk
We obtain the masses, the electromagnetic properties, and the parton distribution functions (PDFs) of the baryons (with a strange quark $\Lambda$ and a charm quark $\Lambda_c$, and their isospin triplet baryons) from a light-front effective Hamiltonian in the leading Fock sector. The effective Hamiltonian consists of the confining potential adopted from light-front holography in the transverse...
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Hee-Jin Kim (Inha University)01/12/2021, 15:35Contributed talk
We investigate the single transverse spin asymmetry of the very forward neutral pion production from interferences between $p$, $\Delta(1232)$, $N^*(1535)$ and $\Delta (1700)$ Reggeons. The Born amplitudes for the $p + p^\uparrow \to \pi^0 + X$ are factorized to the proton-pion-baryon vertex and inclusive proton-baryon amplitude $A_{pB \to X}$. The optical theorem leads these amplitudes to be...
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Wayne de Paula (Instituto Tecnologico de Aeronautica)02/12/2021, 09:50Contributed talk
In this talk I will present a dynamical model for the pion based on the solution of the Bethe-Salpeter equation in Minkowski space. For this end, we use the Nakanishi integral representation of the Bethe-Salpeter amplitude. The input of the interaction kernel has the quark and gluon masses, and also a scale parameter related to the extended quark-gluon vertex. Within this model, we obtain the...
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Sophia Chabysheva (University of Idaho)02/12/2021, 09:50Contributed talk
An effective potential between two fixed sources is computed in light-front quantization for a quenched scalar Yukawa theory. The quenching removes pair-production processes that would result in a spectrum unbounded from below. The sources are fixed with respect to ordinary time, but move in the light-front longitudinal direction. The neutral scalar field is represented by a coherent state,...
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Yiyu Zhou (South China Normal University)02/12/2021, 10:10Contributed talk
We made simultaneous extraction of spin averaged and spin dependent PDFs within multistep MC procedures, with combined analysis of inclusive unpolarized and polarized jets from RHIC to Tevatron energies. By analyzing the preliminary results we had, we were able to discuss impact of theory assumptions on $\Delta g$.
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Ruben Sandapen (Acadia University)02/12/2021, 10:10Contributed talk
In this talk, I will argue that the light-front holographic Schrodinger Equation and the `t Hooft Equation are complementary to each other in governing the transverse and longitudinal dynamics of colour confinement in hadrons. Together, they predict remarkably well the light, heavy-light and heavy-heavy hadrons spectroscopic data, with a universal confinement scale in the holographic...
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Lingfeng Li (Brown University)02/12/2021, 10:30Contributed talk
The rare Z hadronic decays and heavy flavored decayes provides new perspectives to probe the quark sector. Here we propose to study various topics for future colliders working at the $Z$ pole. The study will also further motive detector R$\&$D for the FCC-ee, CEPC and other proposed experiments.
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Bruno El-Bennich (Universidade Cruzeiro do Sul)02/12/2021, 10:30Contributed talk
After motivating the origin of hadronic matrix elements in heavy-meson decays with QCD factorization and heavy quark effective theory, we show how to use continuum QCD approaches based on Dyson-Schwinger and Bethe-Salpeter equations to calculate the heavy-light meson spectrum (and also of quarkonia) and their strong decay amplitudes. I will discuss light-front distribution amplitudes which are...
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Dyana Duarte (Instituto Tecnológico de Aeronáutica)02/12/2021, 10:50Contributed talk
In recent years, many efforts have been developed to formulate and solve the Bethe-Salpeter and Dyson-Schwinger equations (DSE) directly in Minkowski space, in contrast to the usual procedure of formulation in the Euclidean space and subsequent extension to Minkowski space, which is the approach used in lattice gauge theories. In this work, the fermion self-energy is calculated from the...
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João Pacheco De Melo (LFTC - Universidade Cruzeiro do Sul / UNICID)02/12/2021, 10:50Contributed talk
In the present work, the electroweak properties of light and charmed $D$ and $D_s$ pseudoscalar mesons are explored with the covariant constituent quark model. The quark-antiquark-meson vertices are assumed to have a symmetric form by the exchange of quark momenta, which is successful in describing the light pseudoscalar meson properties. The flavor decomposition of the elastic...
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Edson Suisso (Instituto Nacional da Propriedade Industrial)02/12/2021, 11:10Contributed talk
In this work we present results on the nucleon axial form factor and on correlations between the static electroweak observables by using a scalar spin coupling between quarks fields and nucleon fields in a constituent light front quark model. In the context of the Bakamjian-Thomas (BT) of the quark spin coupling scheme it was shown that the axial coupling constant, the proton magnetic moment...
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Wilson Araujo (Secretaria da Educação do Estado de São Paulo)02/12/2021, 11:10Contributed talk
The nucleon electromagnetic properties are studied in a constituent light front quark model by using a scalar spin coupling between quarks fields and nucleon fields. We have studied a comparison between one scale wave function and two scale wave function. The introduction of a high momentum scale in the wave function moves the value of the square momentum transfer, in which the zero of...
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Hao-yu Liu (Beijing Normal University)02/12/2021, 11:10Contributed talk
The talk will include our study on the single hadron inclusive production in the forward rapidity region in proton-nucleus collisions. We find the long-standing negative cross section at next-to-leading-order (NLO) is driven by the large negative threshold logarithmic contributions. We established a factorization theorem for resumming these logarithms with systematically improvable accuracy...
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Guangyao Chen (Jacksonville University)02/12/2021, 11:30Contributed talk
We present the construction of a simple-functional form light-front wavefunctions (LFWFs) of charmonium states on a small-sized basis function representation. In this work, we modeled the LFWFs for four charmonium states, $\eta_c$, $J/\psi$, $\psi'$, and $\psi(3770)$ as superpositions of orthonormal basis functions.The basis functions are eigenfunctions of an effective Hamiltonian, which has a...
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Michael Kreshchuk (Lawrence Berkeley National Laboratory)02/12/2021, 11:30Contributed talk
The light-front quantization provides a natural framework for digital quantum simulation of quantum field theory. In our previous work (2002.04016, 2105.10941), we demonstrated this by developing quantum algorithms based on simulating time evolution and adiabatic state preparation. Aiming for near-term devices, in my talk I will explain how to formulate the relativistic bound state problem as...
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Deepasika Dayananda (North Carolina State University)02/12/2021, 11:50Contributed talk
When the electromagnetic field is applied to a charged particle, the particle motion is described by the Lorentz force equation which reveals the connection between the electromagnetic field strength tensor and the Lorentz transformation generators represented by the boost and the rotation. We interpolate the Lorentz force equation between the instant form dynamics and the light-front dynamics...
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Oscar Acevedo (Institute for Theoretical Physics IFT-UNESP)02/12/2021, 11:50Contributed talk
It is well known that light-front field theories suffer from the appearance of higher-order poles when treated in Feynman's approach to perturbative quantum field theory, originated in the non-local terms which arise in Feynman's propagators of some fields in light-front dynamics. The regularization of these terms is a delicate issue, as there are many prescriptions to do it. In null-plane...
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Hariprashad Ravikumar (New Mexico State University)02/12/2021, 12:05Contributed talk
The instant form and the front form of relativistic dynamics introduced by Dirac in 1949 can be interpolated by introducing an interpolation angle parameter $\delta$ spanning between the instant form dynamics (IFD) at $\delta=0$ and the front form dynamics, which is now known as the light-front dynamics (LFD) at $\delta=\frac{\pi}{4}$. We extend the Poincar\'e algebra interpolation between...
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Jurandi Leão (Instituto Federal São Paulo (IFSP) and LFTC - UCS/ UNICID)02/12/2021, 12:05Contributed talk
The pion plays a special role in the understanding of QCD, the main one is its Goldstone boson nature, associated with the origin of the mass from the dynamical chiral symmetry breaking. One of the possible ways to get information about its substructure, in terms of the degrees of freedom of QCD, quarks and gluons, is from the study of the elastic electron-pion scattering. Because the pion...
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Binbin Liu (Beihang University)02/12/2021, 13:30Contributed talk
Light-front dynamics (LFD) has been of particular interests in hadron physics with the effort of developing the 3D femtography of the nucleon. In this respect, it is important to trace the instantaneous contribution to the fermion propagator in the LFD which involves the constraint degrees of freedom of the fermion. Interpolating the ordinary instant form dynamics (IFD) to the LFD in quantum...
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Bailing Ma (North Carolina State University)02/12/2021, 13:30Contributed talk
We investigate the ``scalar pion'' $\to \gamma^*\gamma^*$ transition form factor for the two emitted virtual photons of momentum squares $q^2$ and $q'^2$ in both space-like and time-like regions. In 1+1 dimensional scalar field model, we use the direct method in the light-front dynamics (LFD) to access the time-like region without resorting to analytic continuation. In particular, we define...
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JungMin Suh (Inha University)02/12/2021, 13:45Contributed talk
In the present talk, we provide the results for the axial-vector transition form factors $C_{5}^{A}(Q^{2})$ from the baryon decuplet to the baryon octet, based on a pion mean-field approach, taking into account the rotational $1/N_{c}$ corrections and the effects of flavor SU(3) symmetry breaking. We obtain all possible axial-vector transition form factors for both the strange-conserving and...
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Anshika Bansal (Physical Research Laboratory)02/12/2021, 13:45Contributed talk
The proton decay is forbidden in the standard model of particle physics. Hence, any signature of proton decay will be a clear signal of new physics beyond the standard model. In this talk, we discuss the $p\rightarrow e^+ \gamma$ decay. It is mediated by the baryon number violating operators of dimension 6 and includes two form factors. We discuss these form factors in the framework of light...
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Daya Shankar Kulshreshtha (University of Delhi)02/12/2021, 14:00Contributed talk
In this talk, we consider a light-front supersymmetric field theory described by the Wess-Zumino model (WZM) which remains invariant under rigid/global supersymmetry transformations (that rotate bosons into fermions and fermions into bosons). The theory satisfies the super Poincare algebra (SPA) and has a non-manifest supersymmetry (different from the superfield formalism). The instant-form...
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Zhi-Min Zhu (Institution of Modern Physics, Chinese Academy of Science)02/12/2021, 14:00Contributed talk
We investigate the leading-twist transverse-momentum-dependent distribution functions (TMDs) for the $\Lambda^0$ and the $\Lambda_c$ heavy baryon, a spin-1/2 composite system consisting of two light quarks ($u$ and $d$) and a heavy quark s/c, using the basis light-front quantization (BLFQ) framework. The light-front wave functions of the heavy baryon in the leading Fock sector are obtained...
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Nam-Yong Ghim (Inha University)02/12/2021, 14:15Contributed talk
Within the context of the in-medium modified chiral soliton model, we present a recent results for the characteristics of baryonic matter. The model's intrinsic parameters are derived by reproducing nuclear matter properties near the saturation density and fitted by using nuclear phenomenology at the nonstrange sector. We obtain an equation of state that is consistent with numerous...
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Bheemsehan Gurjar (Indian institute of technology Kanpur)02/12/2021, 14:20Contributed talk
In this talk, I would like to present some trivial and non-trivial relations between transverse momentum-dependent parton distributions (TMDs) and generalized parton distributions (GPDs) in a light-front quark-diquark model motivated by soft-wall AdS/QCD. And I will show that the relation between the Sivers function and GPD $E^{q}$ can be obtained in terms of the Lensing function and I will...
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Ho-Yeon Won (Inha University)02/12/2021, 14:30Contributed talk
We discuss how the masses of the singly heavy baryons undergo changes in nuclear matter within the framework of a medium-modified SU(3) chiral soliton model. In order to incorporate a heavy quark inside a singly heavy baryon, we introduce the heavy mesons with heavy-quark spin-flavor symmetry considered. We first reproduce bulk properties of nuclear matter such as the saturation energy and...
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Siqi Xu (IMP, CAS)02/12/2021, 14:35Contributed talk
We obtain the light-front wavefunctions (LFWFs) of the nucleon from the light-front quantum chromodynamics (QCD) Hamiltonian, determined for its constituent three-quarks and three-quarks-gluon Fock components, together with a three-dimensional confinement. The eigenvectors of the light-front effective Hamiltonian provide a good quality description of the nucleon electromagnetic and axial form...
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Emanuel Ydrefors (Instituto Tecnologico de Aeronautica)02/12/2021, 14:45Contributed talk
Understanding the structure and dynamics of the proton constitute one of the most important challenges in hadron physics. From the theoretical point of view, one of the challenges is to extract from Lattice QCD calculations, performed in Euclidean space, Minkowskian quantities such as the proton parton distribution function. Due to the inherent difficulties associated with the mapping of...
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Suchismita Sahoo (Central University of Karnataka)02/12/2021, 14:50Contributed talk
We analyse the rare semileptonic decays of $B$ meson to axial vector mesons $K_1(1270)$ and $K_1(1400)$ mediated by the flavor changing neutral current $b \to s ll$ quark level transition, in an effective field theory approach. We perform a global fit to all the relevant and up-to-date $b \to sl^+ l^-$ data for various sets of (axial)vector couplings. We then look over the implications of the...
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Khépani Raya Montaño (University of Granada)02/12/2021, 15:30Contributed talk
How the bulk of the Universe's visible mass emerges and how it is manifest in the existence and structure of hadrons are fundamental questions yet to be answered. Understanding the underlying mechanisms requires being able to explain the structural properties of the pion and kaon. In this talk, we shall discuss many aspects on the internal structure of pion and kaon, as reveales by their...
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Enrique Ruiz Arriola (Universidad de Granada)02/12/2021, 15:30Contributed talk
Following simple large Nc arguments and perturbative QCD constraints complemented with uncertainty estimates based on the idea of meson dominance and the half-width rule, we describe the pseudoscalar form factors of the nucleon. We analyze their implications in the space-like region at intermediate and low energies and compare to recent lattice QCD determinations. Our analysis allows for a...
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Mikhail Altaisky (Space Research Institute RAS)02/12/2021, 15:50Contributed talk
We analyse the use of wavelet transform in quantum field theory models written in light-cone coordinates. In a recent paper [W.N Polyzou, Phys. Rev. D 101(2020) 096004] the author used $x^+$ variable as 'time', and applied wavelet transform to the 'spatial' coordinates only. This makes the theory asymmetric with respect to space and time coordinates. In present contribution we generalize the...
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Francesco Giovanni Celiberto (ECT*/FBK Trento & INFN-TIFPA)02/12/2021, 15:50Contributed talk
We present exploratory studies of the 3D gluon content of the proton, as a result of analyses on leading-twist transverse-momentum-dependent (TMD) gluon distribution functions, calculated in a spectator model for the parent proton. Our formalism embodies a fit-based parameterization for the spectator-mass density, suited to describe both the small- and the moderate-x regime. Particular...
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Dmitri Melikhov (HEPHY, Vienna, Austria and SINP, Moscow, Russia)02/12/2021, 16:10Contributed talk
Nonfactorizable corrections induced by charm-quark loops in exclusive FCNC $B$-decays (i.e. $B$-decays induced by flavour-changing neutral currents) are discussed. We show that a consistent calculation of the appropriate QCD correlation function requires the full generic three-particle distribution amplitude (3DA) $\langle 0|\bar q(y)G_{\mu\nu}(x)b(0)|B(p)\rangle$ with non-aligned arguments:...
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Giovanni Salme' (Istituto Nazionale di Fisica Nucleare)02/12/2021, 16:10Invited talk
The semi-inclusive correlator for a $J =1/2$ bound-system, composed by A spin-$1/2$ fermions, is linearly expressed in terms of the light-front Poincare' covariant spin-dependent spectral function, in valence approximation. The light-front spin-dependent spectral function is fully determined by six scalar functions that allow for a complete description of the six T-even transverse-momentum...
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Nikolay Kivel (Technische Universitaet Muenchen)02/12/2021, 16:30Contributed talk
The $J/\psi$ decays into octet baryon-antibaryons pairs is studied using the QCD factorisation framework. The power suppressed corrections are calculated for the first time using higher twist baryon light-cone distribution amplitudes. The obtained results are used for a phenomenological analysis of experimental data. It is found that the polarisation parameter $\alpha_B$ can be described ...
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Meijian Li (University of Jyväskylä)02/12/2021, 16:30Contributed talk
We develop a numerical method to nonperturbatively study scattering and gluon emission of a quark from a colored target using a light-front Hamiltonian approach. The target is described as a classical color field, as in the color glass condensate effective theory. The Fock space of the scattering system is restricted to the $|q \rangle +|qg \rangle$ sectors, but the time evolution of this...
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Valentina Mantovani Sarti (Technische Universitaet Muenchen)02/12/2021, 16:50Contributed talk
Systems as $\mathrm{K^- p}$ and baryon--antibaryon ($\mathrm{B\overline{B}}$) are both characterised by the presence, already at the production threshold, of strong inelastic channels which can affect the properties and the formation of bound states and resonances. In the $\mathrm{\overline{K}N}$ system, the $\Lambda(1405)$ arises from the interplay between the $\mathrm{\overline{K}N}$ and the...
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Gennady Lykasov (Joint Institute for Nuclear Research)02/12/2021, 16:50Contributed talk
A brief overview of the experimental evidence for the non-zero intrinsic charm (IC) contribution to the proton PDF is presented. The effect of intrinsic heavy quarks on the production of vector bosons accompanied by $c$ and $b$ jets in $pp$ collisions at the LHC is then investigated. The calculations are performed within the combined QCD approach, based on $k_T$-factorization at small...
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Semen Turchikhin (Joint Institute for Nuclear Research)02/12/2021, 17:10Contributed talk
Recent results from the proton-proton collision data taken by the ATLAS experiment on charmonium production and on B_c production and decays will be presented. The measurement of the associated production of the $J/\psi$ meson and a gauge boson, including the separation of single and double parton scattering components, will be discussed. The measurement of $J/\psi$ and $\psi(2S)$ differential...
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Artem Uskov (Budker Institute of Nuclear Physics)02/12/2021, 17:10Contributed talk
We studied the process $e^+e^- → KK\pi$ with the СMD-3 detector at the electron-positron collider VEPP-2000. The statistics collected by the СMD-3 detector in the energy range of $1.2-2$ GeV during the 2011, 2012, 2017, 2019 runs, with a total luminosity integral of $\sim120pb^{-1}$, was used for the analysis. The measured cross-section is crucial for the physics of light hadrons from $u, d,...
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June-Young Kim (Ruhr-University Bochum)02/12/2021, 17:25Contributed talk
In this talk, we present recent results of the leading-twist distribution amplitudes for the nucleon and $\Delta$ baryon within the framework of the chiral quark-soliton model. We first construct the light-cone wave functions to the five-quark state. By employing them, we then obtain the distribution amplitudes in the leading-twist accuracy. We find that it is essential to consider the...
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Ilia Belov (M.V. Lomonosov Moscow State University)02/12/2021, 17:30Contributed talk
In this talk we discuss the nonfactorizable charm-loop effect in the rare FCNC decay $B_s \to \gamma \gamma$. The nonfactorizable contribution comes from the soft gluon emission from c-quark loop. The rigorous calculation requires the knowledge of three particle DA with three independent coordinates. We properly study the influence of three particle DA form on the amplitude by the case of $B_s...
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Miguel Echevarria (University of the Basque Country UPV/EHU)02/12/2021, 17:40Contributed talk
I will discuss the extension of the nucleon spin sum rule to QCD$\times$QED. I will present the QED corrections to the evolution of the quark and gluon helicity and orbital-angular-momentum (OAM) distributions, which are calculated for the first time, and the necessary inclusion of photon and lepton helicity and OAM distributions.
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Hiren Kakkad (AGH University of Science and Technology)02/12/2021, 17:45Contributed talk
We derive a new classical action for gluodynamics by canonically transforming the light cone Yang-Mills action, where the solutions to the field transformations are directly related to the straight infinite Wilson line functionals defined on the constant light-cone time $x^+$. One of the key features of the new action is that it has no triple gluon vertices, because they have been effectively...
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