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The three day long "International Workshop on Hadron Structure and Spectroscopy 2023" (IWHSS-2023) is taking place in Prague from June 26th to 28th in fully in-person mode. It is going to be followed by the COMPASS Collaboration meeting on June 29th and 30th.
IWHSS-2023 is the 19th workshop in the series of annual workshops on Hadron Structure and Spectroscopy, with most recent editions being the IWHSS-2022 (CERN, celebration of 25 years since COMPASS approval and 20 years since the first data taking), IWHSS-2020 (remote due to COVID-19), IWHSS-2019 (Aveiro, Portugal) and IWHSS-2018 (Bonn, Germany).
The scientific programme of the workshop will be traditionally focused on the following topics:
The workshop is organized by the Czech group at COMPASS, representing the Faculty on Nuclear Sciences and Physical Engineering of the Czech Technical University and the Faculty of Mathematics and Physics of the Charles University.
Registration fees:
The goal of LHCspin is to develop, in the next few years, innovative solutions and cutting-edge technologies to access spin physics in high-energy polarized fixed-target collisions, by exploring a unique kinematic regime given by the LHC beam and by exploiting new probes. This ambitious task poses its basis on the recent installation of SMOG2, the unpolarized gas target in front of the LHCb spectrometer. Specifically, the unpolarized target, already itself a unique project, will allow to carefully study the dynamics of the beam-target system, and clarify the potentiality of the entire system, as the basis for an innovative physics program at the LHC. The forward geometry of the LHCb spectrometer (2<𝜂<5) is perfectly suited for the reconstruction of particles produced in fixed-target collisions. This configuration, with center-of-mass energies ranging from 115 GeV in pp interactions to 72 GeV in collisions with nuclear beams, allows to cover a wide backward rapidity region, including the poorly explored high x-Bjorken and high x-Feynman regimes. With the instrumentation of the proposed target system, LHCb will become the first experiment delivering simultaneously unpolarized beam-beam collisions at √s=14 TeV and both polarized and unpolarized beam-target collisions. The status of the project is presented along with a selection of physics opportunities.
We present a calculation of the azimuthal asymmetries in back-to-back production of $J/\psi - \mathrm{jet}$ and $J/\psi-\gamma$ in eP collision. We use NRQCD to estimate the $J/\psi$ production, and assume TMD factorization for the back-to-back kinematics. We show that these asymmetries will be useful for probing the the gluon TMDs, like the linearly polarizaed gluon TMD, in unpolarized scattering, and gluon Sivers function, when the proton is transversely polarized. We give estimates of the upper bound of the asymmetries, as well as using different parametrizations of the gluon TMDs. We investigate the effect of TMD evolution on the asymmetry.
Recent advancements have facilitated the approximate computation of light-cone correlation functions in lattice QCD through the evaluation of their Euclidean counterparts. In this presentation, we will provide a brief overview of these significant developments that have direct implications for Generalized Parton Distributions (GPDs). Additionally, we will delve into our latest work, where we have developed a formalism aimed at enhancing the efficiency of lattice calculations for GPDs.
The near threshold region of heavy quarkonium has received a lot of attention with possible applications to a wide breadth of physics. I will discuss the recent JPAC analysis of new Jefferson Lab data from the GlueX and Jpsi-007 experiments. I will discuss the still wide array of physics scenarios that may underpin the near threshold data including strong coupled channel effects to open charm states and the existence of hidden charm pentaquarks. I highlight the need to disentangle the competing dynamical processes especially as it relates to extracting meaningful quantities related to nucleon structure and or exotic hadrons.