1. Rapidity and centrality dependence of particle production for identified hadrons in Cu+Cu collisions at $\sqrt{s_{NN}} = 200$ GeV
- Author
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BRAHMS Collaboration, Arsene, I. C., Bearden, I. G., Beavis, D., Bekele, S., Besliu, C., Budick, B., B��ggild, H., Chasman, C., Christensen, C. H., Christiansen, P., Dalsgaard, H. H., Debbe, R., Gaardh��je, J. J., Hagel, K., Ito, H., Jipa, A., Johnson, E. B., J��rgensen, C. E., Karabowicz, R., Katrynska, N., Kim, E. J., Larsen, T. M., Lee, J. H., L��vh��iden, G., Majka, Z., Murray, M. J., Natowitz, J., Nielsen, B. S., Nygaard, C., Pal, D., Qviller, A., Rami, F., Ristea, C., Ristea, O., Rohrich, D., Sanders, S. J., Stazel, P., Tveter, T. S., Videb��k, F., Wada, R., Yang, H., Yin, Z., Zgura, I. S., Institut Pluridisciplinaire Hubert Curien (IPHC), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), BRAHMS, Université de Strasbourg (UNISTRA)-Centre National de la Recherche Scientifique (CNRS), Institut Pluridisciplinaire Hubert Curien ( IPHC ), and Centre National de la Recherche Scientifique ( CNRS ) -Université de Strasbourg ( UNISTRA )
- Subjects
velocity ,particle flow: collective phenomena ,Nuclear Theory ,pi ,FOS: Physical sciences ,blast wave ,[PHYS.NEXP]Physics [physics]/Nuclear Experiment [nucl-ex] ,meson ,transverse momentum: momentum spectrum ,nucleus: shadowing ,200 GeV/nucleon ,Nuclear Experiment (nucl-ex) ,[ PHYS.NEXP ] Physics [physics]/Nuclear Experiment [nucl-ex] ,Nuclear Experiment ,numerical calculations ,impact parameter ,initial state ,enhancement ,temperature ,gold ,suppression ,yield ,multiple scattering ,baryon ,freeze-out: kinetic ,p p ,rapidity ,copper ,25.75.Gz ,hydrodynamics ,anti-p: momentum spectrum ,hadron: charged particle ,High Energy Physics::Experiment ,jet: quenching ,particle identification ,absorption ,experimental results ,BRAHMS - Abstract
The BRAHMS collaboration has measured transverse momentum spectra of pions, kaons, protons and antiprotons at rapidities 0 and 3 for Cu+Cu collisions at $\sqrt{s_{NN}} = 200$ GeV. As the collisions become more central the collective radial flow increases while the temperature of kinetic freeze-out decreases. The temperature is lower and the radial flow weaker at forward rapidity. Pion and kaon yields with transverse momenta between 1.5 and 2.5 GeV/c are suppressed for central collisions relative to scaled $p+p$ collisions. This suppression, which increases as the collisions become more central is consistent with jet quenching models and is also present with comparable magnitude at forward rapidity. At such rapidities initial state effects may also be present and persistence of the meson suppression to high rapidity may reflect a combination of jet quenching and nuclear shadowing. The ratio of protons to mesons increases as the collisions become more central and is largest at forward rapidities., 19 pages, 11 figures and 6 tables
- Published
- 2016