scholarly journals Accessing transverse nucleon and gluon distributions in heavy nuclei using coherent vector meson photoproduction at high energies in ion ultraperipheral collisions

2017 ◽  
Vol 95 (2) ◽  
Author(s):  
V. Guzey ◽  
M. Strikman ◽  
M. Zhalov
Keyword(s):  
Vector Meson ◽  
Heavy Nuclei ◽  
Meson Photoproduction ◽  
High Energies ◽  
Gluon Distributions

Exclusive vector meson photoproduction at high energies using the discrete BFKL approach

2020 ◽  
Vol 35 (10) ◽  
pp. 2050057
Author(s):  
Victor P. Goncalves ◽  
Cesar E. Krumreich ◽  
Werner K. Sauter
Keyword(s):  
Vector Meson ◽  
Cross Section ◽  
Phenomenological Study ◽  
Meson Photoproduction ◽  
Nonlinear Saturation ◽  
Text Data ◽  
High Energies ◽  
Bfkl Approach ◽  
Free Parameters ◽  
Saturation Effects

A phenomenological study of the exclusive vector meson photoproduction within the discrete BFKL approach is performed. We estimate the BFKL amplitude in terms of a discrete set of eigenfunctions and use the HERA [Formula: see text] data to constrain the free parameters of the model. As a consequence, we derive a parameter free prediction of the energy dependence of the exclusive vector meson cross section. We demonstrate that the HERA and LHCb data for the exclusive [Formula: see text] and [Formula: see text] photoproduction are quite well describe in a large energy range. However, the model overestimates the precise LHCb data for the smallest values of [Formula: see text], which can be interpreted as an indication of the onset of nonlinear (saturation) effects in the QCD dynamics.

scholarly journals Overview of ALICE results on ultra-peripheral collisions

2019 ◽  
Vol 204 ◽  
pp. 01011
Author(s):  
Evgeny Kryshen
Keyword(s):  
Vector Meson ◽  
Electromagnetic Fields ◽  
Gluon Density ◽  
Heavy Quarkonium ◽  
Meson Photoproduction ◽  
Hadronic Interactions ◽  
Density Distributions ◽  
Peripheral Collisions ◽  
Gluon Distributions ◽  
Nuclear Gluon

Lead nuclei, accelerated at the LHC, are sources of strong electromagnetic fields which can be used to measure photon-induced interactions in a new kinematic regime. These interactions can be studied in ultra-peripheral p–Pb and Pb–Pb collisions where impact parameters are larger than the sum of nuclear radii and hadronic interactions are strongly suppressed. Heavy quarkonium photoproduction is of particular interest since it is sensitive to gluon distributions in target hadrons. An overview of ALICE results on vector meson photoproduction in ultra-peripheral Pb–Pb and p–Pb collisions will be presented. Implications to study gluon density distributions and nuclear gluon shadowing will be discussed.

scholarly journals K0SΣ0 photoproduction at the BGO-OD experiment

2020 ◽  
Vol 241 ◽  
pp. 01009
Author(s):  
Katrin Kohl ◽  
Stefan Alef ◽  
Patrick Bauer ◽  
Reinhard Beck ◽  
Alessandro Braghieri ◽  
...  
Keyword(s):  
Vector Meson ◽  
Momentum Transfer ◽  
Cross Section ◽  
Photon Beam ◽  
Bremsstrahlung Photon ◽  
Meson Photoproduction ◽  
Accelerator Facility ◽  
Transfer Processes

The BGO-OD experiment at the ELSA accelerator facility uses an energy tagged bremsstrahlung photon beam to investigate the excitation structure of the nucleon via meson photoproduction. The setup with a BGO calorimeter surrounding the target and an open dipole spectrometer covering the for ward region is ideally suited for investigating low momentum transfer processes, in particular in strangeness photoproduction. The associated photoproduction of K0S and hyperons is essential to understand the role of K* exchange mech anisms. A cusp-like structure observed in the yp → K0SΣ+ reaction at the K* threshold is described by models including dynamically generated resonances from vector meson-baryon interactions. Such interactions are pre dicted to give a peak like structure in K0SΣ0 photoproduction off the neutron. A very preliminary cross section is determined and compared to the prediction, the results appear to support the model

scholarly journals Color dipole predictions for the exclusive vector meson photoproduction in pp , pPb , and PbPb collisions at run 2 LHC energies

2017 ◽  
Vol 96 (9) ◽  
Author(s):  
V. P. Gonçalves ◽  
M. V. T. Machado ◽  
B. D. Moreira ◽  
F. S. Navarra ◽  
G. Sampaio dos Santos
Keyword(s):  
Vector Meson ◽  
Meson Photoproduction ◽  
Color Dipole

scholarly journals Ultraperipheral vs. Ordinary Nuclear Interactions

Universe ◽  
2019 ◽  
Vol 6 (1) ◽  
pp. 4 ◽  
Author(s):  
I. M. Dremin
Keyword(s):  
Cross Sections ◽  
Heavy Nuclei ◽  
Perturbative Approach ◽  
Hadronic Interactions ◽  
High Energies ◽  
Nuclear Interactions ◽  
The Cross ◽  
Energy Thresholds

It is argued that the cross sections of ultraperipheral interactions of heavy nuclei can become comparable in value to those of their ordinary hadronic interactions at high energies. Simple estimates of corresponding “preasymptotic energy thresholds” are provided. The method of equivalent photons is compared with the perturbative approach. The situation at NICA/FAIR energies is discussed.

scholarly journals Magnetic Field in Nuclear Collisions at Ultra High Energies

Physics ◽  
2019 ◽  
Vol 1 (2) ◽  
pp. 183-193
Author(s):  
Vitalii A. Okorokov
Keyword(s):  
Magnetic Field ◽  
Hard Sphere ◽  
W Boson ◽  
Hadron Collider ◽  
High Energy ◽  
Hard Sphere Model ◽  
Heavy Nuclei ◽  
Proton Proton ◽  
High Energies ◽  
The Magnetic Field

The magnetic field created in proton–proton and nucleus–nucleus collisions at ultra-high energies are studied with models of point-like charges and hard sphere for distribution of the constituents for vacuum conditions. The various beam ions are considered from light to heavy nuclei at energies corresponding to the nominal energies of the proton beam within the projects of further accelerator facilities high-energy Large Hadron Collider (HE-LHC) and Future Circular Collider (FCC). The magnetic-field strength immediately after collisions reaches the value tens of GeV 2 , while in the approach with point-like charges, some overestimate the amplitude of the field in comparison with more realistic hard-sphere model. The absolute value of the magnetic field rapidly decreases with time and increases with growth of atomic number. The amplitude for e B is estimated at level 100 GeV 2 to provide magnitude for quark–quark collisions at energies corresponding to the nominal energies of proton beams. These estimations are close to the range for onset of W boson condensation.

Constraints in vector meson photoproduction

2000 ◽  
Vol 663-664 ◽  
pp. 425c-427c
Author(s):  
W.M. Kloet ◽  
F. Tabakin
Keyword(s):  
Vector Meson ◽  
Meson Photoproduction
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