E-viri
PDF
Recenzirano
Odprti dostop
-
Sirunyan, A.M.; Hartl, C.; Jeitler, M.; Mossolov, V.; Bondu, O.; Chinellato, J.; Aleksandrov, A.; Liu, Z.; Qian, S.J.; Florez, C.; Tuuva, T.; Gras, P.; Chapon, E.; Buttignol, M.; Chabert, E.C.; Fontaine, J.-C.; Pequegnot, A.L.; Popov, A.; Sonnenschein, L.; Nehrkorn, A.; Costanza, F.; Roland, B.; Stefaniuk, N.; Van Onsem, G.P.; Lenz, T.; Vanhoefer, A.; Goldenzweig, P.; Sieber, G.; Wayand, S.; Anagnostou, G.; Sahoo, N.; Keshri, S.; Dutta, D.; Majumder, G.; Bonacorsi, D.; Fanfani, A.; Tuve, C.; Ronchese, P.; Montagna, P.; Martini, L.; Barone, L.; Cenna, F.; Demaria, N.; Mariotti, C.; Della Ricca, G.; Hernandez-Almada, A.; Bialkowska, H.; Kazana, M.; Konecki, M.; Toldaiev, O.; Gavrilenko, M.; Palichik, V.; Konstantinov, D.; Barrio Luna, M.; Flix, J.; Barney, D.; Dupont, N.; Lourenço, C.; Mulders, M.; Perez, E.; Veckalns, V.; Zeuner, W.D.; Donegà, M.; Pandolfi, F.; Quittnat, M.; Candelise, V.; Paganis, E.; Suwonjandee, N.; Newbold, D.M.; Barducci, D.; Shepherd-Themistocleous, C.H.; Henderson, C.; Shalhout, S.; Bhat, P.C.; Kreis, B.; Carver, M.; Bein, S.; Santra, A.; Colafranceschi, S.; Cavanaugh, R.; Xiao, M.; Boren, S.; Toda, S.; Lee, Y.-J.; Stephans, G.S.F.; Alverson, G.; Orimoto, T.; Bylsma, B.; Elmer, P.; Jones, M.; Lath, A.; Saka, H.; Pakhotin, Y.; Melo, A.; Velkovska, J.; Xu, Q.; Barria, P.; Wolfe, E.; Grothe, M.; Levine, A.
Physics letters. B, 02/2017, Letnik: 765, Številka: CJournal Article
Measurements of two- and multi-particle angular correlations in pp collisions at s=5,7, and 13TeV are presented as a function of charged-particle multiplicity. The data, corresponding to integrated luminosities of 1.0pb−1 (5 TeV), 6.2pb−1 (7 TeV), and 0.7pb−1 (13 TeV), 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 v2 of KS0 and Λ/Λ‾ 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 v2 values of charged hadrons (mostly pions), KS0, and Λ/Λ‾, with lighter particle species exhibiting a stronger azimuthal anisotropy signal below pT≈2GeV/c. For 13 TeV data, the v2 signals 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.
