Measurement of forward Z -> e(+)e(-) production at root s=8 TeV

LHCB Collaboration, R. Aaij*, B. Adeva, M. Adinolfi, A. Affolder, Z. Ajaltouni, S. Akar, J. Albrecht, F. Alessio, M. Alexander, S. Ali, G. Alkhazov, P. Alvarez Cartelle, A. A. Alves, S. Amato, S. Amerio, Y. Amhis, L. An, L. Anderlini, J. AndersonM. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, A. Artamonov, M. Artuso, E. Aslanides, G. Auriemma, M. Baalouch, S. Bachmann, J. J. Back, A. Badalov, C. Baesso, W. Baldini, R. J. Barlow, C. Barschel, S. Barsuk, W. Barter, V. Batozskaya, V. Battista, A. Bay, Laurence Carson, P. E. L. Clarke, Greig Cowan, Daniel Craik, S. Eisenhardt, Silvia Gambetta, F. Muheim, M. Needham, S. Playfer

*Corresponding author for this work

Research output: Contribution to journalArticlepeer-review

Abstract

A measurement of the cross-section for Z-boson production in the forward region of pp collisions at 8 TeV centre-of-mass energy is presented. The measurement is based on a sample of Z -> e(+)e(-) decays reconstructed using the LHCb detector, corresponding to an integrated luminosity of 2.0 fb(-1). The acceptance is defined by the requirements 2.0 <eta <4.5 and p(T) > 20 GeV for the pseudorapidities and transverse momenta of the leptons. Their invariant mass is required to lie in the range 60-120 GeV. The cross-section is determined to be

sigma(pp -> Z -> e(+)e(-)) = 93.81 +/- 0.41(stat) +/- 1.48(syst) +/- 1.14(lumi) pb,

where the first uncertainty is statistical and the second reflects all systematic effects apart from that arising from the luminosity, which is given as the third uncertainty. Differential cross-sections are presented as functions of the Z-boson rapidity and of the angular variable phi*, which is related to the Z-boson transverse momentum.

Original languageEnglish
Article number109
Pages (from-to)109
Number of pages21
JournalJournal of High Energy Physics
Volume1505
Issue number5
DOIs
Publication statusPublished - 21 May 2015

Keywords

  • Electroweak interaction
  • QCD
  • Forward physics
  • Hadron-Hadron Scattering
  • proton-proton scattering
  • PARTON DISTRIBUTIONS
  • LHC

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