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001-es BibID:	BIBFORM120549
035-os BibID:	(Scopus)85115323201 (WoS)000704665100006
Első szerző:	Sirunyan, A. M. (fizikus)
Cím:	Observation of forward neutron multiplicity dependence of dimuon acoplanarity in ultraperipheral Pb-Pb Collisions at root{s}_{NN} = 5.02 TeV / A. M. Sirunyan, CMS Collaboration
Dátum:	2021
ISSN:	0031-9007
Megjegyzések:	The first measurement of the dependence of [gamma][gamma]-->[mu]^+[mu]^- production on the multiplicity of neutrons emitted very close to the beam direction in ultraperipheral heavy ion collisions is reported. Data for lead-lead interactions at root{s}_{NN}=5.02 TeV, with an integrated luminosity of approximately 1.5 nb^{-1}, are collected using the CMS detector at the LHC. The azimuthal correlations between the two muons in the invariant mass region 8<m_[mu][mu]<60 GeV are extracted for events including 0, 1, or at least 2 neutrons detected in the forward pseudorapidity range \|[eta]\|>8.3. The back-to-back correlation structure from leading-order photon-photon scattering is found to be significantly broader for events with a larger number of emitted neutrons from each nucleus, corresponding to interactions with a smaller impact parameter. This observation provides a data-driven demonstration that the average transverse momentum of photons emitted from relativistic heavy ions has an impact parameter dependence. These results provide new constraints on models of photon-induced interactions in ultraperipheral collisions. They also provide a baseline to search for possible final-state effects on lepton pairs caused by traversing a quark-gluon plasma produced in hadronic heavy ion collisions.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk Binary alloys Colliding beam accelerators Germanium compounds Heavy ions Ion sources Lead alloys Particle detectors Photons Tellurium compounds Azimuthal correlations Beam direction CMS detectors Heavy-ion collisions Impact-parameter Integrated luminosity Invariant mass Measurements of Neutron multiplicity Pb-Pb collisions
Megjelenés:	Physical Review Letters. - 127 : 12 (2021), p. 1-19. -
További szerzők:	Bartók Márton (fizikus) Karancsi János (1987-) (fizikus) Raics Péter (1944-) (fizikus) Trócsányi Zoltán (1961-) (fizikus) Ujvári Balázs (1977-) (fizikus) CMS Collaboration
Internet cím:	Szerző által megadott URL DOI Intézményi repozitóriumban (DEA) tárolt változat
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