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Multiplicity dependence of two-particle azimuthal correlations in pp collisions at the LHC

Journal article published in 2013 by Pedro Ladron de Guevara, J. Äystö, K. Šafařík, L. Šándor, M. Šumbera, M. C. S. Williams, Sorin Ion Zgura, Ahn Su, Andrew Marshall Adare, J. D. Tapia Takaki, Martin Alfonso Subieta Vasquez, Awes Tc, Baek Yw, Broker Ta, Browning Ta and other authors.
This paper is available in a repository.
This paper is available in a repository.

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Abstract

We present the measurements of particle pair yields per trigger particle obtained from di-hadron azimuthal correlations in pp collisions at $\sqrt{s} = 0.9$, $2.76$, and $7$ TeV recorded with the ALICE detector. The yields are studied as a function of the charged particle multiplicity. Taken together with the single particle yields the pair yields provide information about parton fragmentation at low transverse momenta, as well as on the contribution of multiple parton interactions to particle production. Data are compared to calculations using the PYTHIA6, PYTHIA8, and PHOJET event generators. ; Comment: 36 pages, 18 captioned figures, 4 tables, authors from page 31, published version, figures at http://aliceinfo.cern.ch/ArtSubmission/node/852