Two-particle angular correlations were mea- sured in pp collisions at √s = 7 TeV for pions, kaons, pro- tons, and lambdas, for all particle/anti-particle combinations in the pair. Data for mesons exhibit an expected peak domi- nated by effects associated with mini-jets and are well repro- duced 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 mecha- nisms in the fragmentation process. It currently presents a challenge to Monte Carlo models and its origin remains an open question.

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

Camerini, P.;Fragiacomo, E.;Lea, R.;Luparello, G.;Margagliotti, G. V.;Piano, S.;Rui, R.;Suljic, M.;Zaccolo, V.;
2017-01-01

Abstract

Two-particle angular correlations were mea- sured in pp collisions at √s = 7 TeV for pions, kaons, pro- tons, and lambdas, for all particle/anti-particle combinations in the pair. Data for mesons exhibit an expected peak domi- nated by effects associated with mini-jets and are well repro- duced 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 mecha- nisms in the fragmentation process. It currently presents a challenge to Monte Carlo models and its origin remains an open question.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11368/2915562
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