Počet záznamů: 1

Observation of Excess J/psi Yield at Very Low Transverse Momenta in Au plus Au Collisions at root S-NN =200 GeV and U+U Collisions at root S-NN =193 GeV

SYSNO ASEP	0509904
Druh ASEP	J - Článek v odborném periodiku
Zařazení RIV	J - Článek v odborném periodiku
Poddruh J	Článek ve WOS
Název	Observation of Excess J/psi Yield at Very Low Transverse Momenta in Au plus Au Collisions at root S-NN =200 GeV and U+U Collisions at root S-NN =193 GeV
Tvůrce(i)	Adam, J. (US) Adamczyk, L. (PL) Adams, J. R. (US) Adkins, J. K. (US) Agakishiev, G. (RU) Bielčík, J. (CZ) Bielčíková, Jana (UJF-V)_{RID, ORCID, SAI} Federič, Pavol (UJF-V)_{ORCID, SAI} Chaloupka, P. (CZ) Holub, L. (CZ) Kocan, M. (CZ) Kosarzewski, L. K. (CZ) Kramárik, L. (CZ) Líčeník, R. (CZ) Matonoha, O. (CZ) Moravcová, Z. (CZ) Rusňák, Jan (UJF-V)_{RID, ORCID, SAI} Rusňáková, O. (CZ) Šimko, Miroslav (UJF-V)_{ORCID, SAI} Šumbera, Michal (UJF-V)_{RID, ORCID, SAI} Vaněk, Jan (UJF-V)_{ORCID, SAI}
Celkový počet autorů	335
Číslo článku	132302
Zdroj.dok.	Physical Review Letters. - : American Physical Society - ISSN 0031-9007 Roč. 123, č. 13 (2019)
Poč.str.	8 s.
Forma vydání	Tištěná - P
Jazyk dok.	eng - angličtina
Země vyd.	US - Spojené státy americké
Klíč. slova	STAR collaboration ; heavy ion collisions
Vědní obor RIV	BF - Elementární částice a fyzika vys. energií
Obor OECD	Particles and field physics
CEP	LTT18002 GA MŠMT - Ministerstvo školství, mládeže a tělovýchovy
Způsob publikování	Open access
Institucionální podpora	UJF-V - RVO:61389005
UT WOS	000488270200018
EID SCOPUS	85073061405
DOI	10.1103/PhysRevLett.123.132302
Anotace	We report on the first measurements of J/psi production at very low transverse momentum (p(T) < 0.2 GeV/c) in hadronic Au + Au collisions at root S-NN = 200 GeV and U + U collisions at ONN = 193 GeV. Remarkably, the inferred nuclear modification factor of J/psi at midrapidity in Au + Au (U + U) collisions reaches about 24 (52) for p(T) < 0.05 GeV/c in the 60%-80% collision centrality class. This noteworthy enhancement cannot be explained by hadronic production accompanied by cold and hot medium effects. In addition, the dN/dt distribution of J/psi for the very low p(T) range is presented for the first time. The distribution is consistent with that expected from the Au nucleus and shows a hint of interference. Comparison of the measurements to theoretical calculations of coherent production shows that the excess yield can be described reasonably well and reveals a partial disruption of coherent production in semicentral collisions, perhaps due to the violent hadronic interactions. Incorporating theoretical calculations, the results strongly suggest that the dramatic enhancement of J/psi yield observed at extremely low p(T) originates from coherent photon-nucleus interactions. In particular, coherently produced J/psi in violent hadronic collisions may provide a novel probe of the quark-gluon plasma.
Pracoviště	Ústav jaderné fyziky
Kontakt	Markéta Sommerová, sommerova@ujf.cas.cz, Tel.: 266 173 228
Rok sběru	2020
Elektronická adresa	https://doi.org/10.1103/PhysRevLett.123.132302

Počet záznamů: 1