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Measurement of the underlying event activity using charged-particle jets in proton-proton collisions at vs=2.76 TeV

Abstract: A measurement of the underlying event (UE) activity in proton-proton collisions is performed using events with charged-particle jets produced in the central pseudorapidity region (|?jet| < 2) and with transverse momentum 1 = pTjet < 100 GeV. The analysis uses a data sample collected at a centre-of-mass energy of 2.76 TeV with the CMS experiment at the LHC. The UE activity is measured as a function of pTjet in terms of the average multiplicity and scalar sum of transverse momenta (pT) of charged particles, with |?| < 2 and pT > 0.5 GeV, in the azimuthal region transverse to the highest pT jet direction. By further dividing the transverse region into two regions of smaller and larger activity, various components of the UE activity are separated. The measurements are compared to previous results at 0.9 and 7 TeV, and to predictions of several Monte Carlo event generators, providing constraints on the modelling of the UE dynamics.

 Fuente: Journal of High Energy Physics, Vol. 2015, Num. 9, Art. Num. 137

 Editorial: Springer Verlag

 Fecha de publicación: 01/09/2015

 Nº de páginas: 33

 Tipo de publicación: Artículo de Revista

 DOI: 10.1007/JHEP09(2015)137

 ISSN: 1126-6708,1029-8479

 Proyecto español: FPA2014-55295-C3-1-R ; FPA 2011-28694-C02-01

 Url de la publicación: https://doi.org/10.1007/JHEP09(2015)137

Autoría

KHACHATRYAN, VLADIMIR

JUAN RAMON CASTIÑEIRAS DE SAA

PABLO DE CASTRO MANZANO

MARCOS FERNANDEZ GARCIA

ALBERTO GRAZIANO

MARIA AMPARO LOPEZ VIRTO

RAFAEL JOSE MARCO DE LUCAS

FRANCISCA JAVIELA MUÑOZ SANCHEZ

ANA YAIZA RODRIGUEZ MARRERO