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

Kód výsledku v 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>

Výsledek na webu

<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>

Jazyk výsledku

angličtina

Název v původním jazyce

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

Popis výsledku v původním jazyce

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.

Název v anglickém jazyce

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

Popis výsledku anglicky

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.

Druh

D - Stať ve sborníku

CEP obor

—

OECD FORD obor

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

Projekt

<a href="/cs/project/GA18-07880S" target="_blank" >GA18-07880S: Hledání projevů saturace: závislost fotoprodukce částice J/Psi na energii s použitím dat ze srážek proton - olovo na ALICE</a><br>

Návaznosti

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

Rok uplatnění

2020

Kód důvěrnosti údajů

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

Název statě ve sborníku

Proceedings of Science

ISBN

—

ISSN

1824-8039

e-ISSN

—

Počet stran výsledku

6

Strana od-do

—

Název nakladatele

Sissa Medialab Srl

Místo vydání

Trieste

Místo konání akce

Paris

Datum konání akce

25. 5. 2020

Typ akce podle státní příslušnosti

WRD - Celosvětová akce

Kód UT WoS článku

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