Počet záznamů: 1

Analysis of the apparent nuclear modification in peripheral Pb-Pb collisions at 5.02 TeV

SYSNO ASEP	0505689
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Analysis of the apparent nuclear modification in peripheral Pb-Pb collisions at 5.02 TeV
Tvůrce(i)	Acharya, S. (IN) Acosta, F. T. (US) Adamová, Dagmar (UJF-V)_{RID, ORCID, SAI} Bielčík, J. (CZ) Bielčíková, Jana (UJF-V)_{RID, ORCID, SAI} Broz, M. (CZ) Contreras, J. G. (CZ) Horák, D. (CZ) Křížek, Filip (UJF-V)_{RID, ORCID, SAI} Kučera, Vít (UJF-V)_RID Kushpil, Svetlana (UJF-V)_{RID, ORCID, SAI} Lavička, R. (CZ) Mareš, Jiří A. (FZU-D)_{RID, ORCID} Petráček, V. (CZ) Šumbera, Michal (UJF-V)_{RID, ORCID, SAI} Závada, Petr (FZU-D)_{RID, ORCID}
Celkový počet autorů	1012
Zdroj.dok.	Physics Letters. B. - : Elsevier - ISSN 0370-2693 Roč. 793, č. 6 (2019), s. 420-432
Poč.str.	13 s.
Forma vydání	Tištěná - P
Jazyk dok.	eng - angličtina
Země vyd.	NL - Nizozemsko
Klíč. slova	ALICE collaboration ; heavy ion collisions ; transverse momentum
Vědní obor RIV	BG - Jaderná, atomová a mol. fyzika, urychlovače
Obor OECD	Nuclear physics
Vědní obor RIV – spolupráce	Fyzikální ústav - Elementární částice a fyzika vys. energií
CEP	LTT17018 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy
Výzkumná infrastruktura	CERN-CZ - 90058 - Fyzikální ústav AV ČR, v. v. i.
Způsob publikování	Open access
Institucionální podpora	FZU-D - RVO:68378271 ; UJF-V - RVO:61389005
UT WOS	000470064800063
EID SCOPUS	85065671184
DOI	10.1016/j.physletb.2019.04.047
Anotace	Charged-particle spectra at midrapidity are measured in Pb-Pb collisions at the centre-of-mass energy per nucleon-nucleon pair root s(NN) = 5.02 TeV and presented in centrality classes ranging from most central (0-5%) to most peripheral (95-100%) collisions. Possible medium effects are quantified using the nuclear modification factor (R-AA) by comparing the measured spectra with those from proton-proton collisions, scaled by the number of independent nucleon-nucleon collisions obtained from a Glauber model. At large transverse momenta (8 < p(T) < 20 GeV/c), the average R-AA is found to increase from about 0.15 in 0-5% central to a maximum value of about 0.8 in 75-85% peripheral collisions, beyond which it falls off strongly to below 0.2 for the most peripheral collisions. Furthermore, R-AA initially exhibits a positive slope as a function of p(T) in the 8-20 GeV/c interval, while for collisions beyond the 80% class the slope is negative. To reduce uncertainties related to event selection and normalization, we also provide the ratio of R-AA in adjacent centrality intervals. Our results in peripheral collisions are consistent with a PYTHIA-based model without nuclear modification, demonstrating that biases caused by the event selection and collision geometry can lead to the apparent suppression in peripheral collisions. This explains the unintuitive observation that R-AA is below unity in peripheral Pb-Pb, but equal to unity in minimum-bias p-Pb collisions despite similar charged-particle multiplicities.
Pracoviště	Ústav jaderné fyziky
Kontakt	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Rok sběru	2020
Elektronická adresa	https://doi.org/10.1016/j.physletb.2019.04.047

Počet záznamů: 1