Study of the underlying event at forward rapidity in pp collisions at √s= 0.9, 2.76, and 7 TeV

S Chatrchyan; J. A Brochero Cifuentes; I. J Cabrillo; Alicia Calderon; S. H Chuang; J Duarte Campderros; Marta Felcini; M Fernández; G Gómez; J González Sánchez; A Graziano; C Jorda; A López Virto; Jesús Marco; Rafael Marco; Celso Martínez-Rivero; Francisco Matorras; F. J Muñoz Sánchez; Teresa Rodrigo; Ana Y Rodríguez Marrero; Alberto Ruiz Jimeno; Luca Scodellaro; Iván Vila; Rocío Vilar; CMS Collaboration

doi:10.1007/JHEP04(2013)072

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Study of the underlying event at forward rapidity in pp collisions at √s= 0.9, 2.76, and 7 TeV

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Study of the underlying event at forward rapidity in pp collisions at √s= 0.9, 2.76, and 7 TeV

S Chatrchyan, J. A Brochero Cifuentes, I. J Cabrillo, Alicia Calderon, S. H Chuang, J Duarte Campderros, Marta Felcini, M Fernández, G Gómez, J González Sánchez, …

The journal of high energy physics, Vol.2013(4), 72

01/01/2013

DOI: 10.1007/JHEP04(2013)072

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Abstract

The underlying event activity in proton-proton collisions at forward pseudo-rapidity (−6.6 < η < −5.2) is studied with the CMS detector at the LHC, using a novel observable: the ratio of the forward energy density, dE/dη, for events with a charged-particle jet produced at central pseudorapidity (|η jet| < 2) to the forward energy density for inclusive events. This forward energy density ratio is measured as a function of the central jet transverse momentum, p T, at three different pp centre-of-mass energies (s√=0.9, 2.76, and 7 TeV). In addition, the s√ evolution of the forward energy density is studied in inclusive events and in events with a central jet. The results are compared to those of Monte Carlo event generators for pp collisions and are discussed in terms of the underlying event. Whereas the dependence of the forward energy density ratio on jet p T at each s√ separately can be well reproduced by some models, all models fail to simultaneously describe the increase of the forward energy density with s√ in both inclusive events and in events with a central jet.

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Title: Subtitle: Study of the underlying event at forward rapidity in pp collisions at √s= 0.9, 2.76, and 7 TeV
Creators: S Chatrchyan
J. A Brochero Cifuentes
I. J Cabrillo
Alicia Calderon
S. H Chuang
J Duarte Campderros
Marta Felcini
M Fernández
G Gómez
J González Sánchez
A Graziano
C Jorda
A López Virto
Jesús Marco
Rafael Marco
Celso Martínez-Rivero
Francisco Matorras
F. J Muñoz Sánchez
Teresa Rodrigo
Ana Y Rodríguez Marrero
Alberto Ruiz Jimeno
Luca Scodellaro
Iván Vila
Rocío Vilar
CMS Collaboration
Contributors: Y Onel (Contributor) - University of Iowa, Physics and Astronomy
Resource Type: Journal article
Publication Details: The journal of high energy physics, Vol.2013(4), 72
DOI: 10.1007/JHEP04(2013)072
ISSN: 1126-6708
eISSN: 1029-8479
Publisher: Springer
Language: English
Date published: 01/01/2013
Academic Unit: Physics and Astronomy
Record Identifier: 9984200057402771

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