Measurements of two-and multi-particle angular correlations in pp collisions at √s=5, 7,and13 TeVare presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0 pb−1(5TeV), 6.2 pb−1(7TeV), and 0.7 pb−1(13TeV), were collected using the CMS detector at the LHC. The second-order (v2) and third-order (v3) azimuthal anisotropy harmonics of unidentified charged particles, as well as v2of K0Sand _/_particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v2values of charged hadrons (mostly pions), K0S, and _/_, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pT≈2 GeV/c. For 13TeV data, the v2signals are also extracted from four-and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.

(2017). Evidence for collectivity in pp collisions at the LHC [journal article - articolo]. In PHYSICS LETTERS. SECTION B. Retrieved from http://hdl.handle.net/10446/140611

Evidence for collectivity in pp collisions at the LHC

Re, V.;Vai, I.;
2017-01-01

Abstract

Measurements of two-and multi-particle angular correlations in pp collisions at √s=5, 7,and13 TeVare presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0 pb−1(5TeV), 6.2 pb−1(7TeV), and 0.7 pb−1(13TeV), were collected using the CMS detector at the LHC. The second-order (v2) and third-order (v3) azimuthal anisotropy harmonics of unidentified charged particles, as well as v2of K0Sand _/_particles, are extracted from long-range two-particle correlations as functions of particle multiplicity and transverse momentum. For high-multiplicity pp events, a mass ordering is observed for the v2values of charged hadrons (mostly pions), K0S, and _/_, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pT≈2 GeV/c. For 13TeV data, the v2signals are also extracted from four-and six-particle correlations for the first time in pp collisions, with comparable magnitude to those from two-particle correlations. These observations are similar to those seen in pPb and PbPb collisions, and support the interpretation of a collective origin for the observed long-range correlations in high-multiplicity pp collisions.
articolo
2017
Khachatryan, V.; Sirunyan, A. M.; Tumasyan, A.; Adam, W.; Asilar, E.; Bergauer, T.; Brandstetter, J.; Brondolin, E.; Dragicevic, M.; Erö, J.; Flechl, ...espandi
(2017). Evidence for collectivity in pp collisions at the LHC [journal article - articolo]. In PHYSICS LETTERS. SECTION B. Retrieved from http://hdl.handle.net/10446/140611
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10446/140611
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