Conveners
Gamma-Hadron Collisions
- Marco Battaglieri (GE)
- Aurore Courtoy (Instituto de Física, UNAM)
Gamma-Hadron Collisions
- Aurore Courtoy (Instituto de Física, UNAM)
- Marco Battaglieri (GE)
Gamma-Hadron Collisions
- Aurore Courtoy (Instituto de Física, UNAM)
- Marco Battaglieri (GE)
In this talk we will review some recent progress on light quark spectroscopy
coming from $\eta$ and $\eta$' physics.
I will review the status of heavy quark spectroscopy, in particular the XYZ and pentaquark candidates.
Various measurements of photoproduction in lepton-nucleon interactions are presented, along with their theoretical interpretations. These include spin-independent measurements of inclusive charm and beauty production, isolated photons and jets as well as exclusively produced hadrons. Results of hadron photoproduction in data taken with polarised leptons and nucleons are shown also.
There may exist new sub-GeV particles, χ, which are electrically neutral but couple to the electromagnetic current via higher-dimensional operators. This talk focus on the possible detection of light state coupled to the photon through magnetic- and electric-dipole moments, or carrying an anapole moment or charge radius.
New constraints, as well as future sensitivities, on the existence of...
In this talk we review the recent progress on the numerical determination of the hadronic contributions to the anomalous magnetic moment of the muon and we discuss the role of experimental data on the accuracy of its determination. Special emphasis on the light-by-light scattering contribution and on its main contribution, the pseudoscalar piece, is made. A state-of-the-art deviation between...
The gravitational form factors of hadrons can be studied through hard-exclusive reactions, give access to the "last global unknown property" D-term, and promise insights on the internal forces inside hadrons from a unique perspective through their interpretation in terms of energy-momentum tensor densities. The current experimental and theoretical status is reviewed.
Measurement of open charm and beauty production cross sections in ep deep inelastic scattering (DIS) at HERA from the H1 and ZEUS Collaborations are combined. Reduced cross sections are obtained in a restricted kinematic range. Perturbative QCD calculations are compared to the combined data. Next-to-leading order QCD analysis is performed using these data together with combined inclusive HERA...
The 2015 LHCb discovery of an exotic structure (denoted by $P_c^+$) decaying in $J/\psi \,p$ and conjectured to be a penta-quark state has triggered a renewed interest in the possible existence of multiquark states not predicted by the naive quark model. In this talk we present some considerations on $P_c$ photo-production experiments, aimed at testing its multi-quark interpretation in the...
Vector mesons are plenteously produced in ultra-peripheral collisions where the impact parameter is larger than the sum of the radii of the two projectiles, implying that electromagnetic induced processes become dominant.
Light vector meson photoproduction cross sections can be used to study Glauber-Gribov shadowing effects at the hadronic level while the photoproduction of heavy vector...
The LHCb collaboration has measured central exclusive production of J/ψ, ψ(2S), and Υ mesons as well as J/ψJ/ψ and J/ψψ(2S) meson pairs in proton-proton collisions. The analyses of Υ and charmonium pairs are performed at the centre-of-mass energies of 7 TeV and 8 TeV, and those of J/ψ and ψ(2S) are done at 7 TeV and 13 TeV. The analysis at 13 TeV involves the usage of new shower counters....
Since 2010 two detectors, CMD-3 and SND, have been collecting statistics at the electron-positron collider VEPP-2000. The collected integrated luminosity is about 200 pb$^{-1}$ for each detector in the wide c.m. energy range from 0.32 up to 2 GeV. The current status of analysis as well as recent results are reported. Special attention is paid to the studies of e^+e^- \to \pi^+\pi^-,...
