Measurement of the weak mixing angle using the forward–backward asymmetry of Drell–Yan events in pp collisions at 8 TeV
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Sirunyan2018_Article_MeasurementOfTheWeakMixingAngl.pdf
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Author(s)
Abercrombie, Daniel Robert
Allen, Brandon Leigh
Azzolini, Virginia
Barbieri, Richard Alexander
Baty, Austin Alan
Bauer, Gerry P
Bi, Ran
Brandt, Stephanie Akemi
Busza, Wit
Cali, Ivan Amos
Date Issued
September 2018
Journal
The European Physical Journal C
Citation
CMS Collaboration, et al. “Measurement of the Weak Mixing Angle Using the Forward–Backward Asymmetry of Drell–Yan Events in pp Collisions at 8 TeV.” The European Physical Journal C, vol. 78, no. 9, Sept. 2018. © 2018 CERN for the benefit of the CMS collaboration
Version
Final published version
Abstract
A measurement is presented of the effective leptonic weak mixing angle (sin[superscript 2] θ[superscript ℓ][subscript eff]) using the forward–backward asymmetry of Drell–Yan lepton pairs (μμ and ee) produced in proton–proton collisions at √s = 8 TeV at the CMS experiment of the LHC. The data correspond to integrated luminosities of 18.8 and 19.6 fb[superscript −1]
in the dimuon and dielectron channels, respectively, containing 8.2 million dimuon and 4.9 million dielectron events. With more events and new analysis techniques, including constraints obtained on the parton distribution
functions from the measured forward–backward asymmetry,
the statistical and systematic uncertainties are significantly reduced relative to previous CMS measurements. The extracted value of sin[superscript 2] θ[superscript ℓ][subscript eff] from the combined dilepton data is sin[superscript 2] θ[superscript ℓ][subscript eff] = 0.23101 ± 0.00036 (stat) ± 0.00018 (syst) ± 0.00016 (theo) ± 0.00031 (parton distributions in proton) = 0.23101 ± 0.00053.
MIT Department
Massachusetts Institute of Technology. Department of Physics
Massachusetts Institute of Technology. Laboratory for Nuclear Science
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Creative Commons Attribution 4.0 International License
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DOI of Published Version
https://doi.org/10.1140/epjc/s10052-018-6148-7
