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Invariant mass dependence of particle correlations in π+ p andK + p interactions at 250 GeV/c |
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| Authors: | Ajinenko I V Botterweck F Charlet M Chliapnikov P V De Wolf E A Dziunikowska K Endler A M F Garutchava Z G Gulkanyan G R Karamyan J K Kisielewska D Kittel W Rizatdinova F K Shabalina E K Smirnova L N Tomaradze A Verbeure F |
| Institution: | 3.Department of Physics, University Instelling Antwerpen, B-2610, Wilrijk, Belgium ;5.Institute of Physics and Nuclear Technique of Academy of Mining and Metallurgy and Institute of Nuclear Physics, PL-30055, Krakow, Poland ;9.Nucl. Phys. Institute, Moscow State University, 119899, Moscow, Russia ;2.EC Guest Scientist, University of Nijmegen and NIKHEF-H, NL-6525 ED, Nijmegen, The Netherlands ;1.Institute for High Energy Physics, 142284, Protvino, Russia ;6.Centro Brasileiro de Pesquisas Fisicas, 22290, Rio de Janeiro, Brazil ;7.Institute of High Energy Physics of Tbilisi State University, 380086, Tbilisi, Georgia ;8.Institute of Physics, 375036, Yerevan, Armenia ;10.Inter-University Institute for High Energies, B-1050, Brussels, Belgium ; |
| Abstract: | We study two- and three-particle correlations as a function of invariant mass. Using data on π+ p andK + p collisions at 250 GeV/c, we compare correlation functions and normalised factorial cumulants for various charge combinations. Strong positive correlations are observed only at small invariant masses. The normalised cumulants for “exotic” (??), (++)] and “nonexotic” pairs (+?) and triplets decrease in power-like fashion with increasing invariant mass. The mass dependence is not incompatible with the power-law behaviour as expected in a Dual Mueller-Regge framework. Comparison with FRITIOF reveals strong disagreements, which are due to too large production rates of resonances, such as ρ0 and η, and the absence of a Bose-Einstein low-mass enhancement in JETSET. |
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