J.B. Costales
Lawrence Berkeley National Laboratory
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Physical Review C | 1999
L. Ahle; M. J. LeVine; D.S. Woodruff; O. Hansen; W. L. Kehoe; Y. Wang; S.Y. Fung; H.E. Wegner; B. Budick; C. Y. Chi; K. Yagi; D. P. Morrison; P. Rothschild; W. Eldredge; S. Gushue; C.G. Parsons; Y. Wu; F. Videbaek; E. G. Judd; G.H. Xu; R. Morse; J.H. van Dijk; C. Chasman; O. Vossnack; M. J. Tannenbaum; X. Yang; F. Wang; T. Sung; Y. Miake; H. Sakurai
Charged kaon production has been measured in Si+Al and Si+Au collisions at 14.6 A GeV/c, and Au+Au collisions at 11.1 A GeV/c by Experiments 859 and 866 (the E--802 Collaboration) at the BNL AGS. Invariant transverse mass spectra and rapidity distributions for both K+ and K- are presented. The centrality dependence of rapidity-integrated kaon yields is studied. Strangeness enhancement is observed as an increase in the slope of the kaon yield with the total number of participants as well as the yield per participant. The enhancement starts with peripheral Si+Al and Si+Au collisions (relative to N+N) and appears to saturate for a moderate number of participating nucleons in Si+Au collisions. It is also observed to increase slowly with centrality in Au+Au collisions, to a level in the most central Au+Au collisions that is greater than that found in central Si+A collisions. The enhancement factor for
Physics Letters B | 1987
T. Abbott; Y. Akiba; D.E. Alburger; D. Beavis; Russell Richard Betts; M. A. Bloomer; P.D. Bond; C. Chasman; Y.Y. Chu; B.A. Cole; J.B. Costales; H. J. Crawford; J.B. Cumming; R. Debbe; E. Duek; H.A. Enge; J. Engelage; S.Y. Fung; D. Greiner; L. Grodzins; S. Gushue; H. Hamagaki; O. Hansen; P. Haustein; S. Hayashi; S. Homma; H.N. Huang; Y. Ikeda; S. Katcoff; S. Kaufman
K^+
Physical Review Letters | 1996
Y. Akiba; D. R. Beavis; P. Beery; H.C. Britt; B. Budick; C. Chasman; Z. Chen; C. Y. Chi; Y.Y. Chu; Cianciolo; B. A. Cole; J.B. Costales; H. J. Crawford; J.B. Cumming; R. Debbe; J. Engelage; S. Y. Fung; M. Gonin; S. Gushue; H. Hamagaki; O. Hansen; R. Hayano; S. Hayashi; S. Homma; H. Kaneko; J. H. Kang; S. Kaufman; W. L. Kehoe; K. Kurita; R.J. Ledoux
production are 3.0 +-0.2(stat.) +-0.4(syst.) and 4.0 +-0.3(stat.) +-0.5(syst.), respectively, for the most central 7% Si+Au collisions and the most central 4% Au+Au collisions relative to N+N at the correponding beam energy.
Physics Letters B | 1994
T. Abbott; Y. Akiba; David E. Alburger; D. R. Beavis; P. Beery; M. A. Bloomer; P.D. Bond; C. Chasman; Z. Chen; Y.Y. Chu; B.A. Cole; J.B. Costales; H. J. Crawford; J. B. Cumming; R. Debbe; E. Duek; J. Engelage; S. Y. Fung; L. Grodzins; S. Gushue; H. Hamagaki; O. Hansen; P. E. Haustein; S. Homma; H.Z. Huang; Y. Ikeda; J. S. Kang; S. Katcoff; S. Kaufman; R.J. Ledoux
Abstract The first data from a 16O beam of total energy 232 GeV at the BNL Tandem-AGS are reported. A lead-glass array covering the laboratory pseudo-rapidity interval 1.25
Intersections between particle and nuclear physics | 2008
Presented by Yasuo Miake; T. Abbott; Y. Akiba; David E. Alburger; D. R. Beavis; R.R. Betts; M. A. Bloomer; P.D. Bond; C. Chasman; Z. Chen; Y.Y. Chu; B. A. Cole; J.B. Costales; H. J. Crawford; J.B. Cumming; R. Debbe; J. Engelage; S. Y. Fung; L. Grodzins; S. Gushue; H. Hamagaki; O. Hansen; R. Hayano; S. Hayashi; S. Homma; H.Z. Huang; Y. Ikeda; I. Juricic; S. Katcoff; S. Kaufman
Production of the {phi} meson in central Si+Au collisions has been measured by E859 at the Brookhaven Alternating Gradient Synchrotron by selecting events with identified K{sup +}K{sup -} pairs. The mass and width of the {phi}, obtained from the invariant mass distribution of kaon pairs, are consistent with those of free f mesons. The transverse mass and rapidity distributions are presented. The inverse slope parameter for an exponential fit to the invariant transverse mass distribution is 179{+-}10{+-}17 MeV.
Physical Review Letters | 1996
Y. Akiba; D. R. Beavis; P. Beery; H.C. Britt; B. Budick; C. Chasman; Z. Chen; C. Y. Chi; Y.Y. Chu; V. Cianciolo; B. A. Cole; J.B. Costales; H. J. Crawford; J.B. Cumming; R. Debbe; J. Engelage; S. Y. Fung; M. Gonin; S. Gushue; H. Hamagaki; O. Hansen; R. Hayano; S. Hayashi; S. Homma; H. Kaneko; J. H. Kang; S. Kaufman; W. L. Kehoe; K. Kurita; R.J. Ledoux
Abstract Fluctuations in pseudorapidity distributions of charged particles from central collisions of 16 O+Al and 16 O+Cu at 14.6 A GeV/ c are analyzed using scaled factorial moments. A power-law growth of moments with decreasing bin size is observed down to δη ∼ 0.1. About half the measured signal remains after making corrections based on Monte Carlo calculations with Fritiof and GEANT which include γ-conversions, Dalitz decays and detector effects.
Given at | 1996
Baker; S. Kaufman; W. A. Zajc; K. Ashktorab; T. Sung; S. Ueno; J. C. Dunlop; J. H. Thomas; J. Olness; K. Yagi; Y. Miake; M. J. LeVine; H. Xiang; H. Sakurai; H. Hamagaki; H. Liu; Y. Wang; J. H. Kang; Y. Akiba; F. Wang; D. Zachary; S. Y. Fung; D. R. Beavis; H.C. Britt; F. Zhu; K. Shigaki; Y. Wu; A. Kumagai; B. Budick; R. Hayano
Production of light particles (π±,K±,p) has been measured in both Si+A and p+A collisions. Several interesting features have been observed, among which are: the enhanced K+/π+ ratio and the larger 〈mt〉 for K+ and proton. Comparisons between ≊pp, pA and SiA collisions are discussed.
Nuclear Physics | 1995
B. A. Cole; S. Kaufman; W. A. Zajc; L.P. Remsberg; F. Wang; T. Sung; D. P. Morrison; J. Olness; O. Hansen; C.G. Parsons; Y. Miake; M. J. LeVine; Dieter Roehrich; H. Sakurai; H. Hamagaki; W. L. Kehoe; Y. Wang; J. H. Kang; Y. Akiba; D.S. Woodruff; D. Zachary; S. Y. Fung; B. Moskowitz; D. R. Beavis; H.C. Britt; H.E. Wegner; G. S. F. Stephans; Y.D. Wu; B. Budick; C. Y. Chi
Production of the {phi} meson in central Si+Au collisions has been measured by E859 at the Brookhaven Alternating Gradient Synchrotron by selecting events with identified K{sup +}K{sup -} pairs. The mass and width of the {phi}, obtained from the invariant mass distribution of kaon pairs, are consistent with those of free f mesons. The transverse mass and rapidity distributions are presented. The inverse slope parameter for an exponential fit to the invariant transverse mass distribution is 179{+-}10{+-}17 MeV.
Nuclear Physics | 1989
Hideki Hamagaki; T. Abbott; Y. Akiba; David E. Alburger; D. R. Beavis; R.R. Betts; L. Birstein; M. A. Bloomer; P.D. Bond; C. Chasman; Y.Y. Chu; B. A. Cole; J.B. Costales; H. J. Crawford; J.B. Cumming; R. Debbe; E. Duek; J. Engelage; S. Y. Fung; L. Grodzins; S. Gushue; H. Hamagaki; O. Hansen; S. Hayashi; S. Homma; H.Z. Huang; Y. Ikeda; S. Katcoff; S. Kaufman; K. Kimura
Abstract Recent π − π − correlation measurements and deuteron to proton yield ratio measurements for AuAu collisions from Brookhaven E866 are presented. These measurements allow us, with some interpretation, to deduce the size of the participant region in a heavy ion collision. An unpredicted rise of the apparent source size is seen in the π − π − data at midrapidity. No corresponding drop in the deuteron to proton yield ratio is seen. Further experimental study is needed to improve the statistical significance of the correlation result and to determine whether it can be explained by conventional hadronic means.
3rd Conference on the Intersections Between Particle and Nuclear Physics | 1988
T. Abbott; Y. Akiba; David E. Alburger; D. R. Beavis; R.R. Betts; L. Birstein; M. A. Bloomer; P.D. Bond; C. Chasman; Y.Y. Chu; B. A. Cole; J.B. Costales; H. J. Crawford; J.B. Cumming; R. Debbe; E. Duek; J. Engelage; S. Y. Fung; L. Grodzins; S. Gushue; H. Hamagaki; O. Hansen; R. Hayano; S. Hayashi; S. Homma; H.Z. Huang; Y. Ikeda; S. Katcoff; S. Kaufman; K. Kimura
Abstract This paper presents recent results from Experiment 859 at the BNL AGS, focussing on strangeness ( K ± , Λ, Λ ), rare probes ( p , φ) and two-particle correlations. Highlights of the paper include an analysis of the centrality dependence of K ± yields in terms of the number of participants, a brief review of the current status of the E859 Λ and Λ data, an analysis of the target dependence of p yields in terms of p K − ratios, results of a re-analysis of Λ feed-down contamination of p s, a comparison of the cenal SiAu and pp φ yields through the φ K − ratio, an extremely preliminary study of the centrality dependence of the φ line-shape, a summary of the centrality dependence of two-π correlation source sizes, and a comparison of results from two-dimensional analyses of the two-π and two-K + correlation functions.