Scaling properties of the mean multiplicity and pseudorapidity density in $e^{-}+e^{+}$, $e^{\pm}$+p, p($\bar{\mathrm{p}}$)+p, p+A and A+A(B) collisions

2); 3); B. Schweid (2); Budapest; Department of Atomic Physics; Hungary (4) Brookhaven National Laboratory; J. Alexander (1); M.Csan\'ad (1; New York; Niseem Magdy (1)

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Scaling properties of the mean multiplicity and pseudorapidity density in e⁻+e⁺, e^(pm)+p, p(bar{p})+p, p+A and A+A(B) collisions

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arxiv 1601.06001 v2 pith:VFKNEVIC submitted 2016-01-22 nucl-ex hep-exhep-phnucl-th

Scaling properties of the mean multiplicity and pseudorapidity density in e⁻+e⁺, e^(pm)+p, p(bar{p})+p, p+A and A+A(B) collisions

Roy A. Lacey (1 , 2) , Peifeng Liu (2) , Niseem Magdy (1) , M.Csan\'ad (1 , 3) , B. Schweid (2) , N. N. Ajitanand (1)

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J. Alexander (1) R. Pak (4) ((1) Department of Chemistry Stony Brook University Stony Brook NY USA (2) Dept. of Physics USA (3) Eotvos University Department of Atomic Physics Budapest Hungary (4) Brookhaven National Laboratory Upton New York USA)

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The pseudorapidity density (dN/deta) for p+p, p+A and A+A(B) collisions, and the mean multiplicity <Nch> for ee, ep, and p+p collisions, are studied for an inclusive range of beam energies (Root_s). Characteristic scaling patterns are observed for both dN/deta and <Nch>, consistent with a thermal particle production mechanism for the bulk of the soft particles produced in all of these systems. They also validate an essential role for quark participants in these collisions. The scaled values for dN/deta and <Nch> are observed to factorize into contributions which depend on log(Root_s) and the number of nucleon or quark participant pairs (Npp). Quantification of these contributions give expressions which serve to systematize dN/deta and <Nch> measurements spanning nearly four orders of magnitude in Root_s, and to predict their values as a function of Root_s and Npp.

Scaling properties of the mean multiplicity and pseudorapidity density in e⁻+e⁺, e^(pm)+p, p(bar{p})+p, p+A and A+A(B) collisions

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