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001-es BibID:	BIBFORM119070
035-os BibID:	(Scopus)85066955176 (WOS)000467735200003
Első szerző:	Aidala, C. A.
Cím:	Measurement of charm and bottom production from semileptonic hadron decays in p + p collisions at root{s} = 200 GeV / C. Aidala, PHENIX Collaboration
Dátum:	2019
ISSN:	2470-0010 2470-0029
Megjegyzések:	Measurements of the differential production of electrons from open-heavy-flavor hadrons with charm-and bottom-quark content in p + p collisions at root s = 200 GeV are presented. The measurements proceed through displaced-vertex analyses of electron tracks from the semileptonic decay of charm and bottom hadrons using the PHENIX silicon-vertex detector. The relative contribution of electrons from bottom decays to inclusive heavy-flavor-electron production is found to be consistent with fixed-order-plus-next-to-leading-log perturbative-QCD calculations within experimental and theoretical uncertainties. These new measurements in p + p collisions provide a precision baseline for comparable forthcoming measurements in A + A collisions.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk LARGE TRANSVERSE-MOMENTUM ROOT-S(NN)=200 GEV AU COLLISIONS
Megjelenés:	Physical Review D. - 99 : 9 (2019), p. 1-21. -
További szerzők:	Dávid Gábor (fizikus) Lovász K. (fizikus) Majoros Tamás (1991-) (mérnök, informatikus) Sun, Zhiyu Tarnai G. Ujvári Balázs (1977-) (fizikus) PHENIX Collaboration
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001-es BibID:	BIBFORM086133
035-os BibID:	(WoS)000476784700007 (Scopus)85069542052
Első szerző:	Bíró Barna
Cím:	A Comparison of the Effects of Neutron and Gamma Radiation in Silicon Photomultipliers / B. Biro, G. David, A. Fenyvesi, J. S. Haggerty, J. Kierstead, E. J. Mannel, T. Majoros, J. Molnar, F. Nagy, S. Stoll, B. Ujvari, C. L. Woody
Dátum:	2019
ISSN:	0018-9499
Megjegyzések:	The effects of radiation damage in silicon photomultipliers (SiPMs) from gamma rays have been measured and compared with the damage produced by neutrons. Several types of multipixel photon counters from Hamamatsu were exposed to gamma rays and neutrons at the Solid State Gamma Ray Irradiation Facility (SSGRIF) at the Brookhaven National Laboratory and the Institute for Nuclear Research (Atomki) in Debrecen, Hungary. The gamma ray exposures ranged from 1 krad to 1 Mrad and the neutron exposures ranged from 10 8 to 10 12 n/cm 2 . The main effect of gamma ray damage is an increase in the noise and leakage current in the irradiated devices, similar to what is seen from neutron damage, but the level of damage is considerably less at comparable high levels of exposure. In addition, the damage from gamma rays saturates after a few hundred krad, while the damage from neutrons shows no sign of saturation, suggestive of different damage mechanisms in the two cases. The change in optical absorption in the window material of the SiPMs due to radiation was also measured. This paper was carried out in order to evaluate the use of SiPMs for particle physics applications with moderate levels of radiation exposures.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	IEEE Transactions On Nuclear Science. - 66 : 7 (2019), p. 1833-1839. -
További szerzők:	Dávid Gábor (fizikus) Fenyvesi András Haggerty, J. S. Kierstead, J. Mannel, Eric J. Majoros Tamás (1991-) (mérnök, informatikus) Molnár József Nagy Ferenc (1984-) (fizikus) Stoll, S. Ujvári Balázs (1977-) (fizikus) Woody, C. L.
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001-es BibID:	BIBFORM119322
035-os BibID:	(cikkazonosító)044912 (WoS)000465169900006 (Scopus)85064855873
Első szerző:	PHENIX Collaboration
Cím:	Nonperturbative-transverse-momentum broadening in dihadron angular correlations in root{s_NN}=200 GeV proton-nucleus collisions / PHENIX Collaboration
Dátum:	2019
ISSN:	2469-9985 2469-9993
Megjegyzések:	The PHENIX collaboration has measured high-P T dihadron correlations in p + p, p + A1, and p + Au collisions at root S-NN = 200 GeV. The correlations arise from inter- and intrajet correlations and thus have sensitivity to nonperturbative effects in both the initial and final states. The distributions of p(out), the transverse-momentum component of the associated hadron perpendicular to the trigger hadron, are sensitive to initial-and final-state transverse momenta. These distributions are measured multidifferentially as a function of x(E), the longitudinal momentum fraction of the associated hadron with respect to the trigger hadron. The near-side p(out) widths, sensitive to fragmentation transverse momentum, show no significant broadening between p + Au, p + A1, and p + p. The away-side nonperturbative p(out) widths are found to be broadened in p + Au when compared to p + p; however, there is no significant broadening in p + A1 compared to p + p collisions. The data also suggest that the away-side p(out) broadening is a function of N-coll, the number of binary nucleon-nucleon collisions, in the interaction. The potential implications of these results with regard to initial- and final-state transverse-momentum broadening and energy loss of partons in a nucleus, among other nuclear effects, are discussed.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk
Megjelenés:	Physical Review C. - 99 : 4 (2019), p. 1-10. -
További szerzők:	Dávid Gábor (fizikus) Lovász K. (fizikus) Majoros Tamás Sun, Z. (fizikus) Tarnai G. Ujvári Balázs (1977-) (fizikus)
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001-es BibID:	BIBFORM120236
035-os BibID:	(Scopus)85057581124 (WoS)000451582500006
Első szerző:	PHENIX Collaboration
Cím:	Pseudorapidity Dependence of Particle Production and Elliptic Flow in Asymmetric Nuclear Collisions of p+Al,p+Au, d+Au, and ^{3}He+Au at root[s_{NN}]=200 GeV / PHENIX Collaboration
Dátum:	2018
ISSN:	0031-9007
Megjegyzések:	Asymmetric nuclear collisions of p + Al, p + Au, d + Au, and He-3 + Au at root S-NN = 200 GeV provide an excellent laboratory for understanding particle production, as well as exploring interactions among these particles after their initial creation in the collision. We present measurements of charged hadron production dN(ch)/d eta in all such collision systems over a broad pseudorapidity range and as a function of collision multiplicity. A simple wounded quark model is remarkably successful at describing the full data set. We also measure the elliptic flow 12 over a similarly broad pseudorapidity range. These measurements provide key constraints on models of particle emission and their translation into flow.
Tárgyszavak:	Természettudományok Fizikai tudományok idegen nyelvű folyóiratközlemény külföldi lapban folyóiratcikk ROOT-S-NN=200 GEV COLLECTIVE FLOW PHENIX D+AU
Megjelenés:	Physical Review Letters. - 121 : 22 (2018), p. 1-10. -
További szerzők:	Dávid Gábor (fizikus) Imrek József (1980-) Lovász K. (fizikus) Majoros Tamás Sun, Zhiyu Tarnai G. Ujvári Balázs (1977-) (fizikus)
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