Insight into particle production mechanisms via angular correlations of identified particles in pp collisions at √s=7 TeV

J. Adam, H.A. Andrews, D. Evans, K.L. Graham, P.G. Jones, A. Jusko, M. Krivda, R. Lietava, O. Villalobos Baillie, N. Zardoshti, ALICE Collaboration

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Abstract

Two-particle angular correlations were measured in pp collisions at √s=7 TeV for pions, kaons, protons, and lambdas, for all particle/anti-particle combinations in the pair. Data for mesons exhibit an expected peak dominated by effects associated with mini-jets and are well reproduced by general purpose Monte Carlo generators. However, for baryon–baryon and anti-baryon–anti-baryon pairs, where both particles have the same baryon number, a near-side anti-correlation structure is observed instead of a peak. This effect is interpreted in the context of baryon production mechanisms in the fragmentation process. It currently presents a challenge to Monte Carlo models and its origin remains an open question.
Original languageEnglish
Article number569
JournalEuropean Physical Journal C
Volume77
Issue number8
Early online date24 Aug 2017
DOIs
Publication statusPublished - Aug 2017

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