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

Submission Date: 
Article Information
Submission Form
7 TeV
Abstract Plain Text: 
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.