Measurement of the forward-backward asymmetry in Z/γ → μ+μ decays and determination of the effective weak mixing angle

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. AndersonG. Andreassi, M. Andreotti, J. E. Andrews, R. B. Appleby, O. Aquines Gutierrez, F. Archilli, P. d’Argent, 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, S. Bifani, N. Farley, P. Griffith, P. Ilten, I. R. Kenyon, C. Lazzeroni, A. Mazurov, J. McCarthy, L. Pescatore, D. Popov, N. K. Watson

Research output: Contribution to journalArticlepeer-review

23 Citations (Scopus)
119 Downloads (Pure)

Abstract

The forward-backward charge asymmetry for the process  qq¯ → Z/γ∗ → µ+µ is measured as a function of the invariant mass of the dimuon system. Measurements are performed using proton proton collision data collected with the LHCb detector at √s=7 and 8 TeV, corresponding to integrated luminosities of 1 fb−1 and 2 fb−1 respectively. Within the Standard Model the results constrain the effective electroweak mixing angle to be sin2θeffW = 0.23142 ± 0.00073 ± 0.00052 ± 0.00056, where the first uncertainty is statistical, the second systematic and the third theoretical. This result is in agreement with the current world average, and is one of the most precise determinations at hadron colliders to date.

Original languageEnglish
Article number190
Number of pages19
JournalJournal of High Energy Physics
Volume2015
Issue number11
DOIs
Publication statusPublished - 27 Nov 2015

Keywords

  • Electroweak interaction
  • Forward physics
  • Hadron-Hadron Scattering

ASJC Scopus subject areas

  • Nuclear and High Energy Physics

Fingerprint

Dive into the research topics of 'Measurement of the forward-backward asymmetry in Z/γ → μ+μ decays and determination of the effective weak mixing angle'. Together they form a unique fingerprint.

Cite this