Influence of multiplicity and kinematical cuts on Bose-Einstein correlation in π+p at 250 GeV/c

N. M. Agababyan*, I. V. Ajinenko, M. R. Atayan, H. Böttcher, F. Botterweck, M. Charlet, P. V. Chliapnikov, E. A. De Wolf, K. Dziunikowska, A. M F Endler, Z. C. Garutchava, H. R. Gulkanyan, R. Sh Hakobyan, D. Kisielewska, W. Kittel, S. S. Mehrabyan, K. Olkiewicz, E. K. Shabalina, L. N. Smirnova, L. A. TikhonovaA. G. Tomaradze, F. Verbeure

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

23 Scopus citations


The correlation of negative particles at small momentum difference and its dependence on multiplicity and on kinematical cuts is studied in π+p-interactions at 250 GeV/c. In terms of the Kopylov-Podgoretskii{ogonek} parametrization, an average radius of the pion emitting region of rK=1.59±0.14 fm and a life-time (or emission depth) τ=0.83±0.25 fm are found. The Lorentz invariant parametrization of Goldhaber gives rG=0.85±0.04 fm. Assuming two different sources of pions, their radii are estimated as r1=1.75±0.25 fm and r2=0.60±0.08 fm. An angular and multiplicity dependence of the space-time size of the source is observed. The source is elongated along the collision axis and has larger size rK at higher multiplicities. The radius rK decreases with increasing pion pair momentum. The size of the emitting region appears to be larger for low rapidity pions than for pions from the fragmentation region. No evidence is found for a unique reference frame, where the pion source is motionless for each π+p collision, i. e. where the space-time size of the source is definitely smaller than in any other frame.

Original languageEnglish (US)
Pages (from-to)195-210
Number of pages16
JournalZeitschrift für Physik C Particles and Fields
Issue number2
StatePublished - Jun 1993

ASJC Scopus subject areas

  • Physics and Astronomy (miscellaneous)


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