Effect of event selection on jetlike correlation measurement in d+Au collisions at sNN=200 GeV

AbstractDihadron correlations are analyzed in sNN=200 GeV d+Au collisions classified by forward charged particle multiplicity and zero-degree neutral energy in the Au-beam direction. It is found that the jetlike correlated yield increases with the event multiplicity. After taking into account this dependence, the non-jet contribution on the away side is minimal, leaving little room for a back-to-back ridge in these collisions

Beam-energy Dependence Of Charge Balance Functions From Au + Au Collisions At Energies Available At The Bnl Relativistic Heavy Ion Collider

Conselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq)Balance functions have been measured in terms of relative pseudorapidity (Δη) for charged particle pairs at the BNL Relativistic Heavy Ion Collider from Au + Au collisions at sNN=7.7GeV to 200 GeV using the STAR detector. These results are compared with balance functions measured at the CERN Large Hadron Collider from Pb + Pb collisions at sNN=2.76TeV by the ALICE Collaboration. The width of the balance function decreases as the collisions become more central and as the beam energy is increased. In contrast, the widths of the balance functions calculated using shuffled events show little dependence on centrality or beam energy and are larger than the observed widths. Balance function widths calculated using events generated by UrQMD are wider than the measured widths in central collisions and show little centrality dependence. The measured widths of the balance functions in central collisions are consistent with the delayed hadronization of a deconfined quark gluon plasma (QGP). The narrowing of the balance function in central collisions at sNN=7.7 GeV implies that a QGP is still being created at this relatively low energy. © 2016 American Physical Society.942CNPq, Conselho Nacional de Desenvolvimento Científico e TecnológicoMinistry of Education and Science of the Russian FederationMOE, Ministry of Education of the People's Republic of ChinaMOST, Ministry of Science and Technology of the People's Republic of ChinaNRF-2012004024, National Research FoundationNSF, National Stroke FoundationConselho Nacional de Desenvolvimento Científico e Tecnológico (CNPq

Dielectron Azimuthal Anisotropy At Mid-rapidity In Au+au Collisions At Snn =200 Gev

We report on the first measurement of the azimuthal anisotropy (v2) of dielectrons (e+e- pairs) at mid-rapidity from sNN=200 GeV Au+Au collisions with the STAR detector at the Relativistic Heavy Ion Collider (RHIC), presented as a function of transverse momentum (pT) for different invariant-mass regions. In the mass region Mee<1.1 GeV/c2 the dielectron v2 measurements are found to be consistent with expectations from π0,η,ω, and φ decay contributions. In the mass region 1.1<Mee<2.9GeV/c2, the measured dielectron v2 is consistent, within experimental uncertainties, with that from the cc¯ contributions.906Adams, J., (2005) Nucl. Phys. A, 757, p. 102. , NUPABL 0375-9474Arsene, I., (2005) Nucl. Phys. A, 757, p. 1. , NUPABL 0375-9474Adcox, K., (2005) Nucl. Phys. A, 757, p. 184. , NUPABL 0375-9474Back, B.B., (2005) Nucl. Phys. A, 757, p. 28. , NUPABL 0375-9474Rapp, R., Wambach, J., (2002) Adv. Nucl. Phys., 25, p. 1. , 0065-2970David, G., Rapp, R., Xu, Z., (2008) Phys. 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J/ψ Production At Low Pt In Au+au And Cu+cu Collisions At Snn =200 Gev With The Star Detector

The J/ψ pT spectrum and nuclear modification factor (RAA) are reported for pT<5GeV/c and |y|<1 from 0% to 60% central Au+Au and Cu+Cu collisions at sNN=200GeV at STAR. A significant suppression of pT-integrated J/ψ production is observed in central Au+Au events. The Cu+Cu data are consistent with no suppression, although the precision is limited by the available statistics. RAA in Au+Au collisions exhibits a strong suppression at low transverse momentum and gradually increases with pT. The data are compared to high-pT STAR results and previously published BNL Relativistic Heavy Ion Collider results. 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Beam-energy Dependence Of Charge Separation Along The Magnetic Field In Au+au Collisions At Rhic

Local parity-odd domains are theorized to form inside a quark-gluon plasma which has been produced in high-energy heavy-ion collisions. The local parity-odd domains manifest themselves as charge separation along the magnetic field axis via the chiral magnetic effect. The experimental observation of charge separation has previously been reported for heavy-ion collisions at the top RHIC energies. In this Letter, we present the results of the beam-energy dependence of the charge correlations in Au+Au collisions at midrapidity for center-of-mass energies of 7.7, 11.5, 19.6, 27, 39, and 62.4 GeV from the STAR experiment. After background subtraction, the signal gradually reduces with decreased beam energy and tends to vanish by 7.7 GeV. 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Observation Of D0 Meson Nuclear Modifications In Au+au Collisions At Snn =200gev

We report the first measurement of charmed-hadron (D0) production via the hadronic decay channel (D0→K-+π+) in Au+Au collisions at sNN=200GeV with the STAR experiment. The charm production cross section per nucleon-nucleon collision at midrapidity scales with the number of binary collisions, Nbin, from p+p to central Au+Au collisions. The D0 meson yields in central Au+Au collisions are strongly suppressed compared to those in p+p scaled by Nbin, for transverse momenta pT>3GeV/c, demonstrating significant energy loss of charm quarks in the hot and dense medium. An enhancement at intermediate pT is also observed. Model calculations including strong charm-medium interactions and coalescence hadronization describe our measurements.11314Adams, J., (2005) Nucl. Phys., A757, p. 102. , NUPABL 0375-9474Adcox, K., (2005) Nucl. Phys., A757, p. 184. , NUPABL 0375-9474Muller, B., Schukraft, J., Wyslouch, B., (2012) Annu. Rev. Nucl. Part. Sci., 62, p. 361. , ARPSDF 0163-8998Schukraft, J., (2013) Phys. Scr., T158, p. 014003. , PHSTBO 0031-8949Lin, Z., Gyulassy, M., (1995) Phys. Rev. C, 51, p. 2177. , PRVCAN 0556-2813Cacciari, M., Nason, P., Vogt, R., (2005) Phys. Rev. Lett., 95, p. 122001. , PRLTAO 0031-9007Muller, B., (2005) Nucl. Phys., 750, p. 84. , NUPBBO 0375-9474Dokshitzer Y, L., Kharzeev D, E., (2001) Phys. Lett. B, 519, p. 199. , PYLBAJ 0370-2693Armesto, N., Dainese, A., Salgado C, A., Wiedemann U, A., (2005) Phys. Rev. D, 71, p. 054027. , PRVDAQ 1550-7998Abelev B, I., (2007) Phys. Rev. Lett., 98, p. 192301. , PRLTAO 0031-9007Adler S, S., (2006) Phys. Rev. Lett., 96, p. 032301. , PRLTAO 0031-9007Abelev B, I., J. High Energy Phys., 2012 (9), p. 112. , JHEPFG 1029-8479Abelev B, I., (2012) Phys. Rev. Lett., 109, p. 112301. , PRLTAO 0031-9007Djordjevic, M., Gyulassy, M., Wicks, S., (2005) Phys. Rev. Lett., 94, p. 112301. , PRLTAO 0031-9007Adil, A., Vitev, I., (2007) Phys. Lett. B, 649, p. 139. , PYLBAJ 0370-2693Xu, N., Xu, Z., (2003) Nucl. Phys., 715, p. 587c. , NUPBBO 0375-9474Lin Z, W., Molnar, D., (2003) Phys. Rev. C, 68, p. 044901. , PRVCAN 0556-2813Batsouli, S., Kelly, S., Gyulassy, M., Nagle J, L., (2003) Phys. Lett. B, 557, p. 26. , PYLBAJ 0370-2693Greco, V., Ko C, M., Rapp, R., (2004) Phys. Lett. B, 595, p. 202. , PYLBAJ 0370-2693Moore G, D., Teaney, D., (2005) Phys. Rev. C, 71, p. 064904. , PRVCAN 0556-2813Van Hees, H., Greco, V., Rapp, R., (2006) Phys. Rev. C, 73, p. 034913. , PRVCAN 0556-2813He, M., Fries R, J., Rapp, R., (2012) Phys. Rev. C, 86, p. 014903. , PRVCAN 0556-2813He, M., Fries R, J., Rapp, R., (2013) Phys. Rev. Lett., 110, p. 112301. , PRLTAO 0031-9007Gossiaux P, B., Aichelin, J., Gousset, T., Guiho, V., (2010) J. Phys. G, 37, p. 094019. , JPGPED 0954-3899Gossiaux P, B., Nahrgang, M., Bluhm, M., Gousset Th., Aichelin, J., (2013) Nucl. Phys., A904-A905, p. 992c. , NUPBBO 0550-3213Abelev B, I., (2007) Phys. Rev. C, 75, p. 064901. , PRVCAN 0556-2813Abelev B, I., (2006) Phys. Rev. Lett., 97, p. 152301. , PRLTAO 0031-9007Harrison, M., Ludlam, T., Ozaki, S., (2003) Special Issue on RHIC and Its Detectors, 499, pp. 2-3. , edited by, Nucl. Instr. Meth. A, No.Llope W, J., (2004) Nucl. Instrum. Methods Phys. Res., Sect. A, 522, p. 252. , NIMAER 0168-9002Abelev B, I., (2009) Phys. Rev. C, 79, p. 034909. , PRVCAN 0556-2813Adler, C., Denisov, A., Garcia, E., Murray, M., Stroebele, H., White, S., (2001) Nucl. Instrum. Methods Phys. Res., Sect. A, 470, p. 488. , NIMAER 0168-9002http://drupal.star.bnl.gov/STAR/files/future/proposals/tof-5-24-2004.pdf, STAR TOF proposalAnderson, M., (2003) Nucl. Instrum. Methods Phys. Res., Sect. A, 499, p. 659. , NIMAER 0168-9002Adams, J., (2005) Phys. Rev. Lett., 94, p. 062301. , PRLTAO 0031-9007Adamczyk, L., (2012) Phys. Rev. D, 86, p. 072013. , PRVDAQ 1550-7998Bichsel, H., (2006) Nucl. Instrum. Methods Phys. Res., Sect. A, 562, p. 154. , NIMAER 0168-9002Abelev B, I., (2009) Phys. Rev. C, 79, p. 064903. , PRVCAN 0556-2813Aggarwal M, M., (2011) Phys. Rev. C, 84, p. 034909. , PRVCAN 0556-2813Adamczyk, L., (2014) Phys. Rev. Lett., 113, p. 022301. , PRLTAO 0031-9007Beringer, J., (2012) Phys. Rev. D, 86, p. 010001. , (Particle Data Group),. PRVDAQ 1550-7998 10.1103/PhysRevD.86.010001Wilk, G., Wlodarczyk, Z., (2000) Phys. Rev. Lett., 84, p. 2770. , PRLTAO 0031-9007Alberico W, M., Beraudo, A., De Pace, A., Molinari, A., Monteno, M., Nardi, M., Prino, F., (2011) Eur. Phys. J. C, 71, p. 1666. , EPCFFB 1434-6044Alberico W, M., Beraudo, A., De Pace, A., Molinari, A., Monteno, M., Nardi, M., Prino, F., Sitta, M., (2013) Eur. Phys. J. C, 73, p. 2481. , EPCFFB 1434-6044Cao S, S., Qin G, Y., Bass S, A., (2013) Phys. Rev. C, 88, p. 044907. , PRVCAN 0556-2813Sharma, R., Vitev, I., Zhang B, W., (2009) Phys. Rev. C, 80, p. 054902. , PRVCAN 0556-281

Direct virtual photon production in Au+Au collisions at √sNN = 200 GeV

We report the direct virtual photon invariant yields in the transverse momentum ranges 1 6 GeV/c the production follows T A A scaling. Model calculations with contributions from thermal radiation and initial hard parton scattering are consistent ithin uncertainties with the direct virtual photon invariant yield

Di-hadron correlations with identified leading hadrons in 200 GeV Au+Au and d+Au collisions at STAR

The STAR Collaboration presents for the first time two-dimensional di-hadron correlations with identified leading hadrons in 200 GeV central Au+Au and minimum-bias d+Au collisions to explore hadronization mechanisms in the quark gluon plasma. The enhancement of the jet-like yield for leading pions in Au+Au data with respect to the d+Au reference and the absence of such an enhancement for leading non-pions (protons and kaons) are discussed within the context of a quark recombination scenario. The correlated yield at large angles, specifically in the ridge region, is found to be significantly higher for leading non-pions than pions. The consistencies of the constituent quark scaling, azimuthal harmonic model and a mini-jet modification model description of the data are tested, providing further constraints on hadronization