Conveners
Heavy Flavour
- Diego Milanés (Universidad Nacional de Colombia )
- Jhovanny Andrés Mejia Guisao (Universidad de Antioquia)
La universalidad leptónica implica que los bosones gauge están acoplados por igual a las tres familias de leptones. Esta característica está implícita en el modelo estándar el cual es nuestro modelo actual en física de partículas. Los test de universalidad leptónica consisten en encontrar alguna anomalía con respecto a lo predicho por el modelo estándar, por esta razón estamos interesados en...
Experimental measurements collected by the BABAR, Belle, and LHCb experiments on different observables associated with semileptonic $B$ meson decays, indicate the existence of disagreement with the Standard Model (SM) predictions. We reexamine the new physics scenario in which the SM is extended by a singlet vector leptoquark (LQ) with a TeV-scale mass to accommodate the above mentioned...
Based on the generalized quantum electrodynamics expression for the Podolsky propagator, which preserves gauge invariance for massive photons, we propose a model for the massive gluon propagator that reproduces well-known features of established strong-interaction models in the framework of the Dyson-Schwinger equation. By adjusting the Podolsky mass and the coupling strength we thus construct...
We study the nonleptonic weak decays V_1→ V_2 M, where V_1 is a vector heavy meson as D_((s))^,J/Ψ,B_((s))^,B_c^*,Υ(1S); V_2 is a vector meson and M is a pseudoscalar or vector meson. We calculate the tree-level contribution to these decays given by the transition vector-to-vector, V_1 → V_2, using the covariant light-front quark model to evaluate the form factors. We find that some...
The description of some $B^{+}$ meson production studies is presented, which are based on an event sample of pPb collisions at a center-of-mass energy of $\sqrt{s_{NN}} = 8.16$ TeV, collected by CMS detector at the CERN LHC during 2016 and corresponding to an integrated luminosity of $189.7$ nb$^{ - 1}$. The $B^{+}\rightarrow J/\psi \ K^{+}$ and $J/\psi \rightarrow \mu^{+}\mu^{-}$ decays are...
Preliminary results about the prompt production of some heavy quarkonium states are presented, which are based on an event sample of pPb collisions at a center-of-mass energy of 8.16 TeV, collected by CMS detector during 2016 and corresponding to an integrated luminosity of 180 nb$^{-1}$. $\chi_{c1}\rightarrow$ J/$\psi \gamma$ and $\chi_{c1}\rightarrow$ J/$\psi \gamma$ decays are used for...
A new era for the exploration of hadron structure has begun with the Jefferson Lab 12 GeV program and the planned Electron Ion Collider. The new generation of experiments will allow us to probe the quantum correlation function (QCFs) of quarks and gluons that emerges from the theory of strong interactions. Since these QCFs are not direct physical observables, the experimental data needs to be...
The charmonium decay and production can be modeled using nonrelativistic QCD factorization. This factorization consists of some long-distance matrix elements and a set of constants that must be fixed by the short-distance dynamics. The current work is focused on reviewing the short distance constants’ computation for the B decays into charmonium at NLO using covariant projectors, and their...
The selection of $D^{+}\longrightarrow K^{−}K^{+}K^{+}$ candidates is performed using a multivariate analysis. The study is based on a sample of pp-collision data, collected at a centre-of-mass energy of 13 TeV with the LHCb detector in 2016. Different multivariate classifiers are considered and their signal-background discrimination performance is evaluated. The signal significance is...
In recent years, evidence of Lepton Flavour Universality Violation has been observed in semi-leptonic decays associated with the charged-current transition 𝑏→𝑐𝑙𝜈 ̅ by BABAR, Belle and LHCb experiments, up to 3 standard deviations (3σ). While for the neutral-current transition 𝑏𝑏 ̅→𝑙^+ 𝑙^−, the BABAR collaboration in 2020 reported a discrepancy of 1.8σ in the leptonic decay of the ϒ(3s) meson....
Heavy mesons (quarkonia) behavior is a challenge because of the limitations of the QCD theory at low energies; that is why We propose as a simple approximation to use a nonrelativistic Hamiltonian, which has two divisions: for the close interaction, the Hulthen potential and the distant interaction a root confining potential, theses contributions are neccesary to determine the mass spectra of...
The modeling of heavy hadrons into light ones’ decay modes presents a problem, the weak dynamics factorization. There are some proposals for it, for instance, the MMM (Multi Meson Model) applied to D-> KKK, models the weak part of the amplitude using D's decay constant and its momentum. This is possible as long as the main contribution to the amplitude comes from the annihilation topology, D->...
I will present a simple exploration to the physics of charmonium, i.e., mesonic states which are not simply charm - anticharm configurations. I will describe the most popular configurations proposed for these states. I will then show how these states can be produced in hadronic collisions and in heavy ion collisions, both in central and peripheral reactions.\
A review of the states for the...
Se presenta un estudio preliminar sobre la violación de la simetría CP en los decaimientos de los mesones D^+\rightarrow K^+K^-K^+\ \ y\ \ D^-\rightarrow K^-K^+K^-, donde a partir de un Monte Carlo se hace una simulación de estos decaimientos en un Dalitz Plot, y se realiza mediante el modelo Isobar un análisis de la amplitud para los decaimientos del D^+ y D^-.
