Particle production at very low transverse momenta in Au+Au collisions at √sNN=200 GeV

B. B. Back, M. D. Baker, M. Ballintijn, D. S. Barton, R. R. Betts, A. A. Bickley, R. Bindel, A. Budzanowski, W. Busza, A. Carroll, M. P. Decowski, E. García, N. George, K. Gulbrandsen, S. Gushue, C. Halliwell, J. Hamblen, G. A. Heintzelman, C. Henderson, D. J. HofmanR. S. Hollis, R. Hołyński, B. Holzman, A. Iordanova, E. Johnson, J. L. Kane, J. Katzy, N. Khan, W. Kucewicz, P. Kulinich, C. M. Kuo, W. T. Lin, S. Manly, D. McLeod, A. C. Mignerey, R. Nouicer, A. Olszewski, R. Pak, I. C. Park, H. Pernegger, C. Reed, L. P. Remsberg, M. Reuter, C. Roland, G. Roland, L. Rosenberg, J. Sagerer, P. Sarin, P. Sawicki, W. Skulski, S. G. Steadman, P. Steinberg, G. S.F. Stephans, A. Sukhanov, J. L. Tang, A. Trzupek, C. Vale, G. J. Van Nieuwenhuizen, R. Verdier, F. L.H. Wolfs, B. Wosiek, K. Woźniak, A. H. Wuosmaa, B. Wysłouch

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Abstract

We present results on charged particle production at very low transverse momenta in the 15% most central Au+Au collisions at √sNN=200 GeV obtained with the PHOBOS detector at the Relativistic Heavy Ion Collider. The invariant yields were measured at midrapidity in the transverse momentum ranges from 30 to 50 MeV/c for charged pions, 90 to 130 MeV/c for charged kaons and 140 to 210 MeV/c for protons and antiprotons. No significant enhancement in low transverse momentum particle production is observed as compared to extrapolations of identified particle spectra measured at an intermediate p T range. The spectra tend to flatten at low pT, consistent with the expectations of transverse expansion of the system.

Original languageEnglish
Article number051901
Pages (from-to)051901-1-051901-4
JournalPhysical Review C - Nuclear Physics
Volume70
Issue number5
DOIs
StatePublished - Nov 2004

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