Centrality dependence of ψ(2S) suppression in p-Pb collisions at root sNN= 5.02 TeV

Kód výsledku v IS VaVaI

<a href="https://www.isvavai.cz/riv?ss=detail&h=RIV%2F68407700%3A21340%2F16%3A00301116" target="_blank" >RIV/68407700:21340/16:00301116 - isvavai.cz</a>

Výsledek na webu

<a href="http://dx.doi.org/10.1007/JHEP06(2016)050" target="_blank" >http://dx.doi.org/10.1007/JHEP06(2016)050</a>

DOI - Digital Object Identifier

<a href="http://dx.doi.org/10.1007/JHEP06(2016)050" target="_blank" >10.1007/JHEP06(2016)050</a>

Jazyk výsledku

angličtina

Název v původním jazyce

Centrality dependence of ψ(2S) suppression in p-Pb collisions at root sNN= 5.02 TeV

Popis výsledku v původním jazyce

The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy root s<inf>NN</inf> = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges -4.46 &lt; y<inf>cms</inf>&lt; -2.96 and 2.03 &lt; y<inf>cms</inf>&lt; 3.53, down to zero transverse momentum, by reconstructing the ψ(2S) decay to a muon pair. The ψ(2S) production cross section σ<inf>ψ(2S)</inf> is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the ψ(2S) and on the corresponding 1S charmonium state J/ψ is then studied by means of the double ratio of cross sections [σ<inf>ψ(2S)</inf>/σ<inf>J/ψ</inf>]<inf>pPb</inf>/[σ<inf>ψ(2S)</inf>/σ<inf>J/ψ</inf>]<inf>pp</inf> between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of ψ(2S) production relative to the J/ψ at backward (negative) rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward (positive) rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.

Název v anglickém jazyce

Centrality dependence of ψ(2S) suppression in p-Pb collisions at root sNN= 5.02 TeV

Popis výsledku anglicky

The inclusive production of the ψ(2S) charmonium state was studied as a function of centrality in p-Pb collisions at the nucleon-nucleon center of mass energy root s<inf>NN</inf> = 5.02 TeV at the CERN LHC. The measurement was performed with the ALICE detector in the center of mass rapidity ranges -4.46 &lt; y<inf>cms</inf>&lt; -2.96 and 2.03 &lt; y<inf>cms</inf>&lt; 3.53, down to zero transverse momentum, by reconstructing the ψ(2S) decay to a muon pair. The ψ(2S) production cross section σ<inf>ψ(2S)</inf> is presented as a function of the collision centrality, which is estimated through the energy deposited in forward rapidity calorimeters. The relative strength of nuclear effects on the ψ(2S) and on the corresponding 1S charmonium state J/ψ is then studied by means of the double ratio of cross sections [σ<inf>ψ(2S)</inf>/σ<inf>J/ψ</inf>]<inf>pPb</inf>/[σ<inf>ψ(2S)</inf>/σ<inf>J/ψ</inf>]<inf>pp</inf> between p-Pb and pp collisions, and by the values of the nuclear modification factors for the two charmonium states. The results show a large suppression of ψ(2S) production relative to the J/ψ at backward (negative) rapidity, corresponding to the flight direction of the Pb-nucleus, while at forward (positive) rapidity the suppressions of the two states are comparable. Finally, comparisons to results from lower energy experiments and to available theoretical models are presented.

Druh

J_x - Nezařazeno - Článek v odborném periodiku (Jimp, Jsc a Jost)

CEP obor

BG - Jaderná, atomová a molekulová fyzika, urychlovače

OECD FORD obor

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Projekt

Výsledek vznikl pri realizaci vícero projektů. Více informací v záložce Projekty.

Návaznosti

P - Projekt vyzkumu a vyvoje financovany z verejnych zdroju (s odkazem do CEP)<br>S - Specificky vyzkum na vysokych skolach

Rok uplatnění

2016

Kód důvěrnosti údajů

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

Název periodika

Journal of High Energy Physics

ISSN

1029-8479

e-ISSN

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Svazek periodika

2016

Číslo periodika v rámci svazku

6

Stát vydavatele periodika

DE - Spolková republika Německo

Počet stran výsledku

23

Strana od-do

1-23

Kód UT WoS článku

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EID výsledku v databázi Scopus

2-s2.0-84977160646