Evidence for collectivity in pp collisions at the LHC

Multiplicity (mathematics)
DOI: 10.1016/j.physletb.2016.12.009 Publication Date: 2016-12-13T23:18:33Z
AUTHORS (2258)
ABSTRACT
Measurements of two- and multi-particle angular correlations in pp collisions at sqrt(s) = 5, 7, 13 TeV are presented as a function charged-particle multiplicity. The data, corresponding to integrated luminosities 1.0 inverse picobarn (5 TeV), 6.2 picobarns (7 0.7 (13 were collected using the CMS detector LHC. second-order (v[2]) third-order (v[3]) azimuthal anisotropy harmonics unidentified charged particles, well v[2] K0 short Lambda/anti-Lambda extracted from long-range two-particle functions particle multiplicity transverse momentum. For high-multiplicity events, mass ordering is observed for values hadrons (mostly pions), short, Lambda/anti-Lambda, with lighter species exhibiting stronger signal below pt about 2 GeV/c. signals also four- six-particle first time collisions, comparable magnitude those correlations. These observations similar seen pPb PbPb support interpretation collective origin collisions.
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