Measurement of the underlying event activity using charged-particle jets in proton-proton collisions at sqrt(s) = 2.76 TeV

The CMS collaboration;Basegmez, Suzan;Beluffi, Camille;Bondu, Olivier;Vidal Maroño, Miguel;et.al.
(2015) Journal of High Energy Physics — Vol. 2015, n° 9, p. 137 [1-33] (2015)

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Authors
  • The CMS collaboration
    Author
  • Basegmez, SuzanUCLouvain
    Collaborator
  • Beluffi, CamilleUCLouvain
    Collaborator
  • Bondu, OlivierUCLouvain
    Collaborator
  • Bruno, GiacomoUCLouvain
    Collaborator
  • Castello, RobertoUCLouvain
    Collaborator
  • Caudron, AdrienUCLouvain
    Collaborator
  • Ceard, LudivineUCLouvain
    Collaborator
  • Da Silveira, Gustavo GilUCLouvain
    Collaborator
  • Delaere, Christopheorcid-logoUCLouvain
    Collaborator
  • Favart, DenisUCLouvain
    Collaborator
  • Forthomme, LaurentUCLouvain
    Collaborator
  • Giammanco, Andreaorcid-logoUCLouvain
    Collaborator
  • Hollar, JonathanUCLouvain
    Collaborator
  • Jafari, AbidehUCLouvain
    Collaborator
  • Jez, PavelUCLouvain
    Collaborator
  • Komm, MatthiasUCLouvain
    Collaborator
  • Lemaitre, VincentUCLouvain
    Collaborator
  • Mertens, AlexandreUCLouvain
    Collaborator
  • Nuttens, ClaudeUCLouvain
    Collaborator
  • Perrini, LuciaUCLouvain
    Collaborator
  • Pin, ArnaudUCLouvain
    Collaborator
  • Piotrzkowski, KrzysztofUCLouvain
    Collaborator
  • Popov, AndreyUCLouvain
    Collaborator
  • Quertenmont, LoïcUCLouvain
    Collaborator
  • Selvaggi, MicheleUCLouvain
    Collaborator
  • Vidal Maroño, MiguelUCLouvain
    Collaborator
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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 (abs(eta[jet]) < 2) and with transverse momentum 1<= pt[jet] < 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 pt[jet] in terms of the average multiplicity and scalar sum of transverse momenta (pt) of charged particles, with abs(eta) < 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.
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The CMS collaboration. (2015). Measurement of the underlying event activity using charged-particle jets in proton-proton collisions at sqrt(s) = 2.76 TeV. Journal of High Energy Physics, 2015(9), 137 [1-33]. https://doi.org/10.1007/JHEP09(2015)137 (Original work published 2015)