First measurement of coherent rho(0) photoproduction in ultra-peripheral Xe-Xe collisions at root s(NN)=5.44 TeV

Result code in IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68378271%3A_____%2F21%3A00548948" target="_blank" >RIV/68378271:_____/21:00548948 - isvavai.cz</a>

Alternative codes found

RIV/61389005:_____/21:00548948

Result on the web

<a href="https://doi.org/10.1016/j.physletb.2021.136481" target="_blank" >https://doi.org/10.1016/j.physletb.2021.136481</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1016/j.physletb.2021.136481" target="_blank" >10.1016/j.physletb.2021.136481</a>

Result language

angličtina

Original language name

First measurement of coherent rho(0) photoproduction in ultra-peripheral Xe-Xe collisions at root s(NN)=5.44 TeV

Original language description

The first measurement of the coherent photoproduction of rho(0) vector mesons in ultra-peripheral Xe- Xe collisions at root s(NN) = 5.44 TeV is presented. This result, together with previous HERA gamma p data and gamma-Pb measurements from ALICE, describes the atomic number (A) dependence of this process, which is particularly sensitive to nuclear shadowing effects and to the approach to the black-disc limit of QCD at a semi-hard scale. The cross section of the Xe + Xe -> rho(0) + Xe + Xe process, measured at midrapidity through the decay channel rho(0)-> pi(+)pi(-), is found to be d sigma/dy = 131.5 +/- 5.6(stat.)(-16.9)(+17.5) (syst.) mb. The ratio of the continuum to resonant contributions for the production of pion pairs is also measured. In addition, the fraction of events accompanied by electromagnetic dissociation of either one or both colliding nuclei is reported. The dependence on A of cross section for the coherent rho 0 photoproduction at a centre-of-mass energy per nucleon of the gamma A system of W gamma A,n = 65 GeV is found to be consistent with a power-law behaviour sigma (gamma A -> rho(0) A) proportional to A(alpha) with a slope alpha = 0.96 +/- 0.02(syst.). This slope signals important shadowing effects, but it is still far from the behaviour expected in the black-disc limit.

Czech name

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Czech description

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Type

J_imp - Article in a specialist periodical, which is included in the Web of Science database

CEP classification

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OECD FORD branch

10303 - Particles and field physics

Project

<a href="/en/project/LTT17018" target="_blank" >LTT17018: Getting new knowledge of the microworld using the CERN infrastructure</a><br>

Continuities

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

Publication year

2021

Confidentiality

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

Name of the periodical

Physics Letters. B

ISSN

0370-2693

e-ISSN

1873-2445

Volume of the periodical

820

Issue of the periodical within the volume

SEP

Country of publishing house

NL - THE KINGDOM OF THE NETHERLANDS

Number of pages

12

Pages from-to

136481

UT code for WoS article

000713101800035

EID of the result in the Scopus database

2-s2.0-85111237259