Conveners
Vector meson photoproduction
- Aleksandr Bylinkin (University of Bergen (NO))
- Heikki Mäntysaari (University of Jyväskylä)
Vector meson photoproduction
- Michael Murray (The University of Kansas (US))
- Gerardo Herrera Corral (Centro de Investigación y de Estudios Avanzados del IPN (MX))
Vector meson photoproduction
- Jan Cepila (Czech Technical University in Prague (CZ))
- Antoni Szczurek
Vector meson photoproduction
- Cesar Luiz Da Silva (Los Alamos National Laboratory (US))
- Spencer Robert Klein (Lawrence Berkeley National Lab. (US))
I will review calculations of vector meson production in ultra peripheral collisions. I will focus on exclusive J/Psi and rho production at RHIC and LHC and address their potential to elucidate nuclear effects including gluon saturation, as well as nuclear structure, sub-nucleonic fluctuations, and entanglement driven interference effects. I will focus on dipole models and compare to...
In this talk a solution of the target-rapidity Balitsky-Kovchegov (BK) equation will be presented considering the complete impact-parameter dependence, including the orientation of the dipole with respect to the impact-parameter vector. The target-rapidity formulation of the BK equation introduces non-locality in rapidity. Three different prescriptions are considered to take into account the...
We study the coherent photoproduction of light vector mesons in $AA$ collisions using the color dipole approach. We use the Glauber--Gribov formalism, however, it has to be supplemented by the gluon shadowing, since the coherence length of higher dipole Fock states is smaller than the nucleus radius. We fit this gluon shadowing to the deep inelastic structure function $F_2$ (E665) and $\rho$...
In ultra-peripheral collisions (UPCs), the photon fluctuates to a quark-antiquark dipole which then elastically scatters off the nucleus, emerging as vector meson and opposite-charge pseudoscalar meson pair. The excellent particle identification capabilities of ALICE enable the study of photoproduced pi+pi- and K+K- pairs at midrapidity in Pb--Pb collisions at √sNN = 5.02 TeV. We will present...
In this talk, we discuss the exclusive photoproduction of ground and excited states of $\psi(1S,2S)$ and $\Upsilon(1S,2S)$ in ultraperipheral collisions (UPCs). Using the potential approach in order to obtain the vector meson wave function, we find a good agreement of our calculations with data from the LHC and HERA colliders for $J/\psi (1S,2S) $ and $\Upsilon(1S)$ in $\gamma p$ collisions....
Vector meson production in high-energy UPCs is an excellent tool to study the dynamics of small-x gluons inside nuclei. Employing the Color Glass Condensate (CGC) effective field theory, I will describe the impact that gluon saturation has in exclusive and semi-inclusive J/\psi production in UPC reactions.
In the first part of the talk, I will focus on exclusive J/\psi production and show...
Coherent photoproduction has long been studied in UPCs. Although interference between the two nuclear targets has been studied, other quantum mechanical problems have received much less attention. In this talk, I will discuss some open problems, including studying the limits of coherence, and quantum mechanical aspects of multiple vector meson production in a single UPC.
Ultra-strong electromagnetic field in relativistic heavy-ion collisions can generate a large flux of linearly polarized quasi-real photons. Photons emitted by one nucleus can interact with the other whole nucleus or individual nucleons to produce vector meson ($\gamma + A \rightarrow V + A$). On the other hand, interactions between photons emitted by two nuclei can produce lepton pairs...
Exclusive vector meson photoproduction in ultraperipheral heavy-ion collisions is a well-established tool to probe the gluon structure of the colliding nuclei. This talk will focus on the observation of entanglement-enabled spin interference in the ρ0 meson photoproduction, in the form of angular anisotropy. Such an anisotropy appears due to two different factors: the first is that the photons...
Exclusive vector meson photoproduction in ultra-peripheral collisions (UPC)
is a unique tool to study quantum chromodynamics in nucleus-nucleus
collisions. In a UPC, photon induced interaction takes place on one
of the nuclei, while the other is the source of virtual photon. Neutrons
may be emitted from the target nucleus and eventually detected
in a very forward calorimeter. Here we...
Gluons are found to become increasingly dominant constituents of nuclear matter when being probed at higher energies or smaller Bjorken-x values. This has led to the question of the ultimate fate of nuclear gluonic structure at extreme density. In ultraperipheral collisions (UPCs) of relativistic heavy ions, the coherent heavy flavor vector meson production via photon-nuclear interactions is...
In ultra-peripheral collisions (UPCs), exclusive vector meson photoproduction, e.g., $\rho^{0}$ and $J/\psi$, has been considered one of the most sensitive probes to the gluon structure in heavy nuclei. Recently, it was discovered that the linear polarization of the photons involved in these processes can enable measurements of the nuclear geometry through the so-called entanglement-enabled...
Double Parton Scattering (DPS) is a important way for which we can investigate the parton distributions of the proton and the nucleus. Although, we know that such scatterings should occur in high energy collisions, the formalism to describe it lack of answers to questions like --- is there a universal effective cross section? In direction to explore such questions, we investigate DPS in...
We revisit the Wigner function approach to the impact parameter dependent
dilepton pair production developed in [M. Klusek-Gawenda, WS, A. Szczurek Phys.Lett.B 814 (2021) 136114]. We study the distribution of the angle between difference and sum of lepton transverse momenta, and show how it relates to the orbital angular momentum of leptons. The dependence on impact paramter is discussed,...
