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Title

Ratios of charged antiparticles to particles near midrapidity in Au + Au collisions at square root SNN = 200 GeV

Author(s)

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

Abstract

The ratios of charged antiparticles to particles have been obtained for pions, kaons, and protons near midrapidity in central Au+Au collisions at sqrt[sNN]=200 GeV. Ratios of 〈π-〉/〈π+〉=1.025±0.006(stat.)±0.018(syst.), 〈K-〉/〈K+〉=0.95±0.03(stat.)±0.03(syst.), and 〈p̅ 〉/〈p〉=0.73±0.02(stat.)±0.03(syst.) have been observed. The 〈K-〉/〈K+〉 and 〈p̅ 〉/〈p〉 ratios are consistent with a baryochemical potential μB of 27 MeV, roughly a factor of 2 smaller than in sqrt[sNN]=130 GeV collisions. The data are compared to results from lower energies and model calculations. Our accurate measurements of the particle ratios impose stringent constraints on current and future models dealing with baryon production and transport.

Publication type

Journal article

Source

Physical Review C: Nuclear Physics, Vol. 67, no. 2 (Feb 2003), pp. 219011-219015

Publication year

2003

FOR Code(s)

0202 Atomic, Molecular, Nuclear, Particle and Plasma Physics

Keyword(s)

Antiparticles;  Au+Au collisions;  Baryon production;  Particle ratios;  Particles

Publisher

American Physical Society

ISSN

0556-2813

Publisher URL

http://dx.doi.org/10.1103/PhysRevC.67.021901

Copyright

Copyright © 2003 American Physical Society. The accepted manuscript is reproduced in accordance with the copyright policy of the publisher.

Full text

Peer reviewed