Study of the underlying event at forward rapidity in pp collisions at √s=0.9,2.76, and 7 TeV
Name
Chatrchyan2013_Article_StudyOfTheUnderlyingEventAtFor.pdf
Description
Published version
Size
712.88 KB
Format
Unknown
Checksum (MD5)
f7b5e8a7aaf62847c1bcef8d96b5bb6c
Author(s)
The CMS Collaboration
Apyan, Aram
Bauer, Gerry P
Busza, Wit
Butz, Erik M.
Cali, Ivan Amos
Chan, M.
Dutta, Valentina
Gomez-Ceballos, Guillelmo
Goncharov, Maxim
Date Issued
2013
Journal
Journal of High Energy Physics
Publisher
Springer Science and Business Media LLC
Citation
Chatrchyan, S., et al. "Study of the Underlying Event at Forward Rapidity in Pp Collisions at Root S=0.9, 2.76, and 7 Tev." Journal of High Energy Physics 4 (2013): 36.
Version
Final published version
Abstract
© 2013, CERN. 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 (|ηjet| < 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, pT, at three different pp centre-of-mass energies (√s = 0.9, 2.76, and 7TeV). 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 pT at each ^fs 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.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
Terms of Use
Creative Commons Attribution 4.0 International license
Persistent DSpace Link
DOI of Published Version
https://doi.org/10.1007/JHEP04(2013)072
