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Centrality dependence of dihadron correlations and azimuthal anisotropy harmonics in PbPb collisions at vSNN = 2.76 Tev

Abstract: Measurements from the CMS experiment at the LHC of dihadron correlations for charged particles produced in PbPb collisions at a nucleon?nucleon centre-of-mass energy of 2.76 TeV are presented. The results are reported as a function of the particle transverse momenta (p T) and collision centrality over a broad range in relative pseudorapidity (??) and the full range of relative azimuthal angle (??). The observed two-dimensional correlation structure in ?? and ?? is characterised by a narrow peak at (??,??)?(0,0) from jet-like correlations and a long-range structure that persists up to at least |??|=4. An enhancement of the magnitude of the short-range jet peak is observed with increasing centrality, especially for particles of p T around 1?2 GeV/c. The long-range azimuthal dihadron correlations are extensively studied using a Fourier decomposition analysis. The extracted Fourier coefficients are found to factorise into a product of single-particle azimuthal anisotropies up to p T?3?3.5 GeV/c for at least one particle from each pair, except for the second-order harmonics in the most central PbPb events. Various orders of the single-particle azimuthal anisotropy harmonics are extracted for associated particle p T of 1?3 GeV/c, as a function of the trigger particle p T up to 20 GeV/c and over the full centrality range.

Otras publicaciones de la misma revista o congreso con autores/as de la Universidad de Cantabria

 Autoría: Chatrchyan S., Khachatryan V., Sirunyan A.M., Tumasyan A., Adam W., Bergauer T., Dragicevic M., Erö J., Fabjan C., Friedl M., Frühwirth R., Ghete V.M., Hammer J., Hoch M., Hörmann N., Hrubec J., Jeitler M., Kiesenhofer W., Knapitsch A., Krammer M., Liko D., Mikulec I., Pernicka M., Rahbaran B., Rohringer C., Rohringer H., Schöfbeck R., Strauss J., Taurok A., Teischinger F., Wagner P., Waltenberger W., Walzel G., Widl E., Wulz C.

 Fuente: European Physical Journal C, 2012, 72(5), 2012

Editorial: Springer

 Año de publicación: 2012

Nº de páginas: 26

Tipo de publicación: Artículo de Revista

 DOI: 10.1140/epjc/s10052-012-2012-3

ISSN: 1434-6044,1434-6052

Url de la publicación: https://doi.org/10.1140/epjc/s10052-012-2012-3

Autoría

CHATRCHYAN, S.

JAVIER ANDRES BROCHERO CIFUENTES

SHANHUEI CHUANG

MARTA FELCINI

MARCOS FERNANDEZ GARCIA

PATRICIA LOBELLE PARDO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO

MARIA DEL MAR SOBRON SAÑUDO