Insight into particle production mechanisms via angular correlations of identified particles in pp collisions at $\sqrt{s}=7$ TeV

Abstract : Two-particle angular correlations were measured in pp collisions at $\sqrt{s} = 7$ TeV. The analysis was carried out 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.
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Submitted on : Tuesday, January 3, 2017 - 2:12:43 PM
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J. Adam, J.C. Hamon, B. Hippolyte, C. Kuhn, A. Maire, et al.. Insight into particle production mechanisms via angular correlations of identified particles in pp collisions at $\sqrt{s}=7$ TeV. European Physical Journal C: Particles and Fields, Springer Verlag (Germany), 2017, 77, pp.569. ⟨10.1140/epjc/s10052-017-5129-6⟩. ⟨in2p3-01425231⟩

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