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Peter Hurck (University of Glasgow (GB))03/04/2024, 11:00
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Stefan Wallner (Max Planck Institute for Physics)03/04/2024, 11:30
While the excitation spectrum of light-meson, which are composed of up and down quarks, is already mapped out rather well, the strange-meson spectrum still holds many surprises that we need to discovered. At the COMPASS experiment at CERN, we study the spectrum of strange mesons using a negative kaon beam. The flagship channel is the decay to the $K^−\pi^−\pi^+$ final state, for which COMPASS...
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Marco Maggiora (Universita e INFN Torino (IT))03/04/2024, 12:00
At BESIII, the lineshapes of e+e- ->phi eta', phi eta, KK, omega pi0, eta pipi, omega pipi are measured from 2.0 to 3.08 GeV, where resonant structures are observed in these processes. Multiple lineshapes of intermediate state are obtained by a partial wave analysis of e+e- ->K+ K- pi0 pi0, K+K- pi0 and the structures observed provide essential input to understand the nature of phi2170. ...
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Hao Li03/04/2024, 13:30
We have investigated the spin structure of photoproduced hyperon pairs for the first time. At Jefferson Lab, we have collected data on the reactions $\gamma p \rightarrow \overline{\Lambda}\Lambda p$ (with $\Lambda \rightarrow \pi^- p, \overline{\Lambda} \rightarrow \pi^+ \overline{p}$) from the threshold up to a beam photon energy of 11.4 GeV. Phenomenological models have been developed to...
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Dr Mark Peter Whitehead (University of Glasgow (GB))03/04/2024, 14:00
I will discuss contributions from LHCb to strange hadron spectroscopy to date, and try to motivate and discuss future expansions of such programmes with the LHCb upgrade and LHCb Upgrade II detectors. The enormous data samples expected will bring opportunities for further contributions that will be covered.
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Kiyoshi Tanida03/04/2024, 14:30
I will talk on recent results on hyperon spectroscopy from the Belle experiment. The results include $\Lambda(1670)$, $\Sigma(1435)$, $\Xi(1620/1690)$, and $\Omega(2012)$. I will also discuss future prospects of the Belle II experiment.
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Christopher Thomas (University of Cambridge)03/04/2024, 15:30
I will provide an overview of some recent work on the spectroscopy and interactions of hadrons using first-principles lattice QCD calculations. Progress will be illustrated with a few examples of calculations of the masses and other properties of hadron resonances, including the coupling of a resonance to a photon, and scattering amplitudes. I will comment on the phenomenology suggested by the...
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Inti Lehmann03/04/2024, 16:00
I plan to give an overview of GSI and FAIR, its science scope, the current status of the FAIR construction, the next steps and current developments.
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Peter Hurck (University of Glasgow (GB))03/04/2024, 16:30
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Ales Cieply (Nuclear Physics Institute, Rez, Czechia)04/04/2024, 09:30
The measurements of $\pi\Sigma$ mass distributions in the $\gamma p \rightarrow K^{+}\pi\Sigma$ photoproduction reaction [1] probe the energy region of the $\Lambda(1405)$ resonance, just below the $\bar{K}N$ threshold, and provide new challenges for the theoretical models of $\pi\Sigma - \bar{K}N$ coupled channels interactions. Adopting the photoproduction model presented in [2, 3] and the...
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Dr Yuki Kamiya (Bonn University)04/04/2024, 10:00
In the KbarN-piSigma coupled-channel system, two resonance states of the Lambda(1405) and Lambda(1380) states are considered to appear in the same physical Riemann sheets. To investigate the origin of these states, the detailed knowledge on the interaction is required. In this talk, we discuss the pole positions at the unphysical quark masses which can be accessed in the lattice QCD...
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Barbara Alexandra Cid Mora04/04/2024, 11:00
This talk presents results of the first coupled-channel meson-baryon $\pi\Sigma - \bar{K}N$ computation from lattice QCD in the $\Lambda(1405)$ region. Correlation functions were calculated using a single ensemble with pion mass $m_{\pi}= 200$ MeV and kaon mass $m_{\mathrm{K}}= 487$ MeV, and included single- and multi-hadron operators. Once the finite-volume energy spectra were reliably...
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Raquel Molina Peralta04/04/2024, 11:30
We recall that the chiral unitary approach for the interaction of pseudoscalar mesons with the baryons of the decuplet predicts two states for the $\Xi(1820)$ resonance, one with a narrow width and the other one with a large width. We contrast this fact with the recent BESIII measurement of the $K^-\Lambda$ mass distribution in the $\psi(3686)$ decay to $K^-\Lambda \bar{\Xi}^+$, which demands...
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Dr Thomas Jude (The University of Bonn)04/04/2024, 14:00
The existence of exotic multi-quark states beyond the conventional valence three quark and quark-antiquark systems has been unambiguously confirmed in the heavy quark sectors. Such states could manifest as single colour bound objects, or evolve from meson-baryon and meson-meson interactions, creating molecular like systems and re-scattering effects near production thresholds. Equivalent...
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Jesse Hernandez (Florida State University)04/04/2024, 14:30
The GlueX experiment in Hall D at Jefferson Lab has amassed high-statistics data on photoproduction processes. By leveraging the high-intensity linearly polarized photon beam the hyperon program at GlueX has made many contributions to this sector. With these results, contributions that advance the GlueX mission of understanding hadrons have been achieved through measurements of various...
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Kiyoshi Tanida04/04/2024, 15:30
I will talk on the results from recent experiments in J-PARC and discuss on future prospects on hyperon spectroscopy. The talk will cover:
- E31: $\Lambda(1405)$ by $d(K^-,NY\pi)$ reactions
- E42: H-dibaryon search in $^{12}C(K^-,K^+)$ reaction
- E72: Search for the new exotic hyperon $\Lambda(1665)$
- Some other experiments under planning
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Dr Stuart Fegan (University of York)04/04/2024, 16:00
Commissioned in 2017, the CLAS12 spectrometer is the flagship detector system in Hall B at Jefferson Lab, replacing the previous spectrometer, CLAS, which operated from 1997 until 2012. CLAS12 enables large acceptance studies of electron-induced reactions using the now energy-doubled CEBAF electron beam, with access to quasi-real photoprodcution processes via the low-Q2 Forward Tagger. This...
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Peter Hurck (University of Glasgow (GB))04/04/2024, 16:30
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Eulogio Oset05/04/2024, 09:30
I shall report on recent calculations of the correlation functions for the coupled channels K lambda, K Sigma, Eta N, using input from the chiral unitary approach. Then I will face the inverse problem, starting from these correlations and assuming present experimental errors in this type of correlation functions, I will show how one can learn about dynamics of the interaction of particles,...
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Annika Thiel (University of Bonn (DE))05/04/2024, 10:00
The spectrum of excited $\Sigma$ and $\Lambda$ states is sparse with only few additions from last decade. Recently, ideas are developed how to identify the missing states using polarized photons and polarized targets. Two differents experiments are currently investigating the measurement of polarization observables for hyperon photoproduction, the CBELSA/TAPS experiment at ELSA and the GlueX...
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Adam Szczepaniak (Indiana University)05/04/2024, 11:00
I discus the importance of peripheral (photo)production in production of resonances.
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Prof. Jozef Dudek05/04/2024, 11:30
Our theoretical and experimental understanding of the spectrum of meson resonances with $J^{PC}=(1,2,3)^{--}$ heavier than the $\phi(1020)$ is relatively weak. While there is strong evidence for fairly narrow isovector and isoscalar $3^{--}$ states, there are no good $2^{--}$ candidates, and the $1^{--}$ sector, where resonances may be broad and are expected to overlap, is rather confused. The...
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Megumi Naruki05/04/2024, 13:00
It has been 15 years since J-PARC started operating. J-PARC is a research complex to cover particle, hadron, nuclear and condensed matter physics. At the Hadron Hall, intense pion and/or kaon beams up to 2 GeV/c enable us to study hypernucleus, exotic hadron and hyperon scattering. Recently the new beamline, names as the high-momentum beamline has been constructed to deliver primary protons up...
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Stuart Fegan (University of York)05/04/2024, 13:30
The KLong Experiment in Jefferson Lab Hall D will use a secondary beam of neutral kaons and the GlueX experimental setup to perform strange hadron spectroscopy. By achieving a flux on the order of $1\times10^4$ $K_L$ /sec, KLF will allow a broad range of measurements that improve the statistics of previous world data by several orders of magnitude.
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The experiment will measure both...
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