||Insight into particle production mechanisms via angular correlations of identified particles in pp collisions at s√=7 TeV
ALICE Collaboration ,
Busch , O. ,
Chujo , T. ,
Esumi, S.Miake, Y.
The European physical journal. C
, p.569 , 2017-08 , Springer
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.