Experimental comparison of <math><mtext>J</mtext><mtext>ψ</mtext></math> production by π±, K±, p and p̄ beams at 39.5 GeV/c期刊界 All Journals 搜尽天下杂志传播学术成果专业期刊搜索期刊信息化学术搜索

Experimental comparison of $J ψ$ production by π^±, K^±, p and p̄ beams at 39.5 GeV/c

Authors:	M.J. Corden J.D. Dowell D. Eastwood J. Garvey R.J. Homer M. Jobes I.R. Kenyon T. McMahon R.J. Vallance P.M. Watkins J.A. Wilson J. Gago M. Jung P. Sonderegger D. Treille P.L. Woodworth V. Eckardt J. Fent K.C.T.O. Sumorok

Affiliation:	Birmingham University, Birmingham, UK;CERN, European Organization for Nuclear Research, Geneva, Switzerland;Max Planck Institut für Physik und Astrophysik, München, Germany

Abstract:	Measurements have been made of relative production cross sections of the $J ψ$ by π^±, K^±, p and p? at 39.5 GeV/c incident on copper. $J ψ$ production rates from π^?, K^? and p? are similar. The $J ψ$ relative particle/anti-particle production cross sections for x>0 are $σ(π^{+}) σ(π^{?})=(0.87±0.14)$ , σ(K⁺)/σ(K^?)=(0.85±0.5) and $σ(p) σ(p ?)=(0.15 ±0.08)$ . The small p/p? cross section ratio disagrees with models of J/ψ production by gluon amalgamation.

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