2,799 research outputs found
Single-spin asymmetry of J/ψ production in p+p, p+Al, and p+Au collisions with transversely polarized proton beams at √sNN=200 GeV
No full textWe report the transverse single-spin asymmetries of J/ψ production at forward and backward rapidity, 1.2This article is published as Aidala, C., Y. Akiba, M. Alfred, V. Andrieux, N. Apadula, H. Asano, B. Azmoun et al. "Single-spin asymmetry of J/ψ production in p+ p, p+ Al, and p+ Au collisions with transversely polarized proton beams at s N N= 200 GeV." Physical Review D 98, no. 1 (2018): 012006. DOI: 10.1103/PhysRevD.98.012006. Posted with permission.</p
Production of π0 and η mesons in Cu+Au collisions at sNN =200 GeV
No full textProduction of π0 and η mesons has been measured at midrapidity in Cu+Au collisions at sNN=200GeV. Measurements were performed in π0(η)→γγ decay channel in the 1(2)-20GeV/c transverse momentum range. A strong suppression is observed for π0 and η meson production at high transverse momentum in central Cu+Au collisions relative to the p+p results scaled by the number of nucleon-nucleon collisions. In central collisions the suppression is similar to Au+Au with comparable nuclear overlap. The η/π0 ratio measured as a function of transverse momentum is consistent with mT-scaling parametrization down to pT=2GeV/c, its asymptotic value is constant and consistent with Au+Au and p+p and does not show any significant dependence on collision centrality. Similar results were obtained in hadron-hadron, hadron-nucleus, and nucleus-nucleus collisions as well as in e+e- collisions in a range of collision energies sNN=3-1800 GeV. This suggests that the quark-gluon-plasma medium produced in Cu+Cu collisions either does not affect the jet fragmentation into light mesons or it affects the π0 and η the same way. © 2018 authors. Published by the American Physical Society. Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article's title, journal citation, and DOI. Funded by SCOAP3
Measurements of μμ pairs from open heavy flavor and Drell-Yan in p + p collisions at √s = 200 GeV
No full textPHENIX reports differential cross sections of mu mu pairs from semileptonic heavy-flavor decays and the Drell-Yan production mechanism measured in p + p collisions at root s = 200 GeV at forward and backward rapidity (1.2 This article is published as Aidala, C., Y. Akiba, M. Alfred, V. Andrieux, N. Apadula, H. Asano, B. Azmoun et al. "Measurements of μ μ pairs from open heavy flavor and Drell-Yan in p+ p collisions at s= 200 GeV." Physical Review D 99, no. 7 (2019): 072003. DOI: 10.1103/PhysRevD.99.072003. Posted with permission.</p
Low-momentum direct-photon measurement in Cu + Cu collisions at √sNN = 200 GeV
No full textWe measured direct photons for pTThis article is published as Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander et al. "Low-momentum direct-photon measurement in Cu+ Cu collisions at s N N= 200 GeV." Physical Review C 98, no. 5 (2018): 054902. DOI: 10.1103/PhysRevC.98.054902. Posted with permission.</p
Measurement of emission-angle anisotropy via long-range angular correlations with high-pT hadrons in d + Au and p + p collisions at √sNN = 200 GeV
No full textWe present measurements of two-particle angular correlations between high-transverse-momentum (2 This article is published as Adare, A., C. Aidala, N. N. Ajitanand, Y. Akiba, H. Al-Bataineh, J. Alexander, M. Alfred et al. "Measurement of emission-angle anisotropy via long-range angular correlations with high-p T hadrons in d+ Au and p+ p collisions at s NN= 200 GeV." Physical Review C 98, no. 1 (2018): 014912. DOI: 10.1103/PhysRevC.98.014912. Posted with permission.</p
Measurement of charm and bottom production from semileptonic hadron decays in p + p collisions at √s = 200 GeV
No full textMeasurements of the differential production of electrons from open-heavy-flavor hadrons with charm- and bottom-quark content in p+p collisions at √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.This article is published as Aidala, C., Y. Akiba, M. Alfred, V. Andrieux, N. Apadula, H. Asano, B. Azmoun et al. "Measurement of charm and bottom production from semileptonic hadron decays in p+ p collisions at s= 200 GeV." Physical Review D 99, no. 9 (2019): 092003. DOI: 10.1103/PhysRevD.99.092003. Posted with permission.</p
High-p(T) charged hadron suppression in Au+Au collisions at root(SNN)=200 GeV
No full textThe PHENIX experiment at the Relativistic Heavy Ion Collider has measured charged hadron yields at midrapidity over a wide range of transverse momenta (0.5 This article is published as Adler, Stephen Scott, S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, J. Alexander, R. Amirikas et al. "High-p T charged hadron suppression in Au+ Au collisions at s N N= 200 GeV." Physical Review C 69, no. 3 (2004): 034910. DOI: 10.1103/PhysRevC.69.034910. Posted with permission.</p
Cross section and transverse single-spin asymmetry of muons from open heavy-flavor decays in polarized p plus p collisions at root s=200 GeV
No full textThe cross section and transverse single-spin asymmetries of mu(-) and mu(+) from open heavy-flavor decays in polarized p + p collisions at root s = 200 GeV were measured by the PHENIX experiment during 2012 at the Relativistic Heavy Ion Collider. Because heavy-flavor production is dominated by gluon-gluon interactions at root s = 200 GeV, these measurements offer a unique opportunity to obtain information on the trigluon correlation functions. The measurements are performed at forward and backward rapidity (1.4 This article is published as Aidala, C., N. N. Ajitanand, Y. Akiba, R. Akimoto, J. Alexander, M. Alfred, K. Aoki et al. "Cross section and transverse single-spin asymmetry of muons from open heavy-flavor decays in polarized p+ p collisions at s= 200 GeV." Physical Review D 95, no. 11 (2017): 112001. DOI:10.1103/PhysRevD.95.112001. Posted with permission.</p
High p(T) direct photon and pi(0) triggered azimuthal jet correlations and measurement of k(T) for isolated direct photons in p plus p collisions at root s=200 GeV
No full textCorrelations of charged hadrons of 1This article is published as Adare, A., S. Afanasiev, C. Aidala, N. N. Ajitanand, Yasuyuki Akiba, H. Al-Bataineh, J. Alexander et al. "High p T direct photon and π 0 triggered azimuthal jet correlations and measurement of k T for isolated direct photons in p+ p collisions at s= 200 GeV." Physical Review D 82, no. 7 (2010): 072001. DOI:10.1103/PhysRevD.82.072001. Posted with permission.</p
Measurement of single electron event anisotropy in Au plus Au collisions at root s(NN)=200 GeV
No full textThe transverse momentum dependence of the azimuthal anisotropy parameter v(2), the second harmonic of the azimuthal distribution, for electrons at midrapidity (vertical bar eta vertical bar This article is published as Adler, S. S., S. Afanasiev, C. Aidala, N. N. Ajitanand, Y. Akiba, J. Alexander, R. Amirikas et al. "Measurement of single electron event anisotropy in Au+ Au collisions at s NN= 200 GeV." Physical Review C 72, no. 2 (2005): 024901. DOI: 10.1103/PhysRevC.72.024901. Posted with permission.</p
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