ALICE measurements of coherent p0 photoproduction in Pb–Pb ultra-peripheral collisions

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F20%3A00347591" target="_blank" >RIV/68407700:21340/20:00347591 - isvavai.cz</a>

Result on the web

<a href="https://doi.org/10.22323/1.382.0225" target="_blank" >https://doi.org/10.22323/1.382.0225</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.22323/1.382.0225" target="_blank" >10.22323/1.382.0225</a>

Result language

angličtina

Original language name

ALICE measurements of coherent p0 photoproduction in Pb–Pb ultra-peripheral collisions

Original language description

The powerful photon fluxes of relativistic nuclei provide the possibility to study photonuclear and two-photon interactions in ultra-peripheral collisions (UPC), where the nuclei do not overlap and no strong nuclear interactions occur. Within the Vector Meson Dominance Model (VDM), the p0 contribution dominates the QCD part of the photon structure function. The y + A -> p0 + A process in heavy-ion UPC is an excellent tool to test the black disk regime, where the target nucleus appears like a black disk and the total p0 + A cross section reaches its limit. RHIC and first LHC results have deviated from some Glauber+VDM calculations, which thus call for new data. The ALICE Collaboration reports [1] the first measurements of coherent rho photoproduction accompanied by electromagnetic dissociation (EMD) with data taken at root sNN = 5.02 TeV. The rapidity-dependent cross section of coherent p0 photoproduction is measured and it is compared with theoretical models. In addition, a resonance-like structure around 1.7 GeV/c2 is observed.

Czech name

—

Czech description

—

Type

D - Article in proceedings

CEP classification

—

OECD FORD branch

10301 - Atomic, molecular and chemical physics (physics of atoms and molecules including collision, interaction with radiation, magnetic resonances, Mössbauer effect)

Project

<a href="/en/project/GA18-07880S" target="_blank" >GA18-07880S: Searching for signatures of saturation: energy dependence of J/Psi photoproduction with ALICE proton - lead data</a><br>

Continuities

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)

Publication year

2020

Confidentiality

S - Úplné a pravdivé údaje o projektu nepodléhají ochraně podle zvláštních právních předpisů

Article name in the collection

Proceedings of Science

ISBN

—

ISSN

1824-8039

e-ISSN

—

Number of pages

6

Pages from-to

—

Publisher name

Sissa Medialab Srl

Place of publication

Trieste

Event location

Paris

Event date

May 25, 2020

Type of event by nationality

WRD - Celosvětová akce

UT code for WoS article

—