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001-es BibID:	BIBFORM125526
035-os BibID:	(WoS)001271471000001 (Scopus)85200812670
Első szerző:	CMS Collaboration
Cím:	Extracting the speed of sound in quark-gluon plasma with ultrarelativistic lead-lead collisions at the LHC / CMS Collaboration
Dátum:	2024
ISSN:	0034-4885
Megjegyzések:	Ultrarelativistic nuclear collisions create a strongly interacting state of hot and dense quark-gluon matter that exhibits a remarkable collective flow behavior with minimal viscous dissipation. To gain deeper insights into its intrinsic nature and fundamental degrees of freedom, we determine the speed of sound in an extended volume of quark-gluon plasma using lead-lead (PbPb) collisions at a center-of-mass energy per nucleon pair of 5.02 TeV. The data were recorded by the CMS experiment at the CERN LHC and correspond to an integrated luminosity of 0.607 nb(-1). The measurement is performed by studying the multiplicity dependence of the average transverse momentum of charged particles emitted in head-on PbPb collisions. Our findings reveal that the speed of sound in this matter is nearly half the speed of light, with a squared value of 0.241 +/- 0.002 (stat) +/- 0.016 9(syst) in natural units. The effective medium temperature, estimated using the mean transverse momentum, is 219 +/- 8 The measured squared speed of sound at this temperature aligns precisely with predictions from lattice quantum chromodynamic (QCD) calculations. This result provides a stringent constraint on the equation of state of the created medium and direct evidence for a deconfined QCD phase being attained in relativistic nuclear collisions.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk CMS QCD equation of state quark-gluon plasma speed of sound ultra-central
Megjelenés:	Reports On Progress In Physics. - 87 : 7 (2024), p. 1-19. -
További szerzők:	Bartók Márton (fizikus) Raics Péter (1944-) (fizikus) Ujvári Balázs (1977-) (fizikus) Zilizi Gyula (1965-) (fizikus)
Internet cím:	DOI Intézményi repozitóriumban (DEA) tárolt változat
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