Maqola

Measurement of pion enhancement at low transverse momentum and of the Δ resonance abundance in Si-nucleus collisions at AGS energy

J. BarretteMcGill University, Montreal, CanadaR. BellwiedWayne State University, Detroit, MI 48202, USAP. Braun‐MunzingerSUNY, Stony Brook, NY 11794, USAW. ClelandUniversity of Pittsburgh, Pittsburgh, PA 15260, USAT. M. CormierWayne State University, Detroit, MI 48202, USAG. DavidSUNY, Stony Brook, NY 11794, USAJ. DeeSUNY, Stony Brook, NY 11794, USAG. DieboldYale University, New Haven, CT 06511, USAO. DietzschUniversity of São Paulo, São Paulo, BrazilJ. V. GermaniYale University, New Haven, CT 06511, USAS. GilbertMcGill University, Montreal, CanadaS. V. GreeneYale University, New Haven, CT 06511, USAJ. R. HallUniversity of New Mexico, Albuquerque, NM 87131, USAT. K. HemmickSUNY, Stony Brook, NY 11794, USAN. HerrmannGesellschaft für Schwerionenforschung, Darmstadt, GermanyB. HongSUNY, Stony Brook, NY 11794, USAK. JayanandaUniversity of Pittsburgh, Pittsburgh, PA 15260, USAD. KrausUniversity of Pittsburgh, Pittsburgh, PA 15260, USAB. S. KumarYale University, New Haven, CT 06511, USAR. LacasseMcGill University, Montreal, CanadaD. Lissauer[Brookhaven National Laboratory]W. J. LlopeStony Brook UniversityT. Ludlam[Brookhaven National Laboratory]S. McCorkle[Brookhaven National Laboratory]R. MajkaYale University ;S. K. MarkMcGill UniversityJ. T. MitchellYale University ;Moorthy S. MuthuswamyStony Brook UniversityE. O’Brien[Brookhaven National Laboratory]C. A. PruneauMcGill UniversityM. N. RaoStony Brook UniversityF. S. RotondoYale University ;N. C. daSilvaUniversidade de Sao Paulo#TAB#D. U. J. SonnadaraUniversity of PittsburghJ. StachelStony Brook UniversityH. Takai[Brookhaven National Laboratory]E. M. TakaguiUniversity of PittsburghT. G. Throwe[Brookhaven National Laboratory]G. WangMcGill UniversityDouglas A. WolfeC. L. Woody[Brookhaven National Laboratory]N. XuStony Brook UniversityY. ZhangStony Brook UniversityZ. ZhangUniversity of PittsburghC. ZouStony Brook University

1995en

ABI

Annotatsiya

We present measurements of pion transverse momentum (pt) spectra in central Si-nucleus collisions in the rapidity range 2.0 < y < 5.0 for pt down to and including pt = 0. The data exhibit an enhanced pion yield at low pt compared to what is expected for a purely thermal spectral shape. This enhancement is used to determine the Δ resonance abundance at freeze-out. The results are consistent with a direct measurement of the Δ resonance yield by reconstruction of proton-pion pairs and imply a temperature of the system at freeze-out close to 140 MeV.

Identifikatorlar

DOI: 10.1016/0370-2693(95)00329-j

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