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Abstract: Event-by-event long-range correlations of azimuthal anisotropy Fourier coefficients
in 8.16 TeV
data, collected by the CMS experiment at the CERN Large Hadron Collider, are extracted using a subevent four-particle cumulant technique applied to very low multiplicity events. Each combination of four charged particles is selected from either two, three, or four distinct subevent regions of a pseudorapidity range from
to 2.4 of the CMS tracker, and with transverse momentum between 0.3 and 3.0 GeV. Using the subevent cumulant technique, correlations between
of different orders are measured as functions of particle multiplicity and compared to the standard cumulant method without subevents over a wide event multiplicity range. At high multiplicities, the
coefficients exhibit an anticorrelation; this behavior is observed consistently using various methods. The
correlation strength is found to depend on the number of subevents used in the calculation. As the event multiplicity decreases, the results from different subevent methods diverge because of different contributions of noncollective or few-particle correlations. Correlations extracted with the four-subevent method exhibit a tendency to diminish monotonically toward the lowest multiplicity region (about 20 charged tracks) investigated. These findings extend previous studies to a significantly lower event multiplicity range and establish the evidence for the onset of long-range collective multiparticle correlations in small system collisions.
Fuente: Physical Review C. 14 January 2021. 103, 014902
Editorial: American Physical Society
Año de publicación: 2021
Nº de páginas: 17
Tipo de publicación: Artículo de Revista
Url de la publicación: https://doi.org/10.1103/PhysRevC.103.014902