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Measurement of the weak mixing angle using the forward-backward asymmetry of Drell-Yan events in pp collisions at $\sqrt{s}=13\,\text {TeV}$


CMS Collaboration; Canelli, Florencia; Kilminster, Benjamin; Aarestad, Thea; Brzhechko, Danyyl; Caminada, Lea; De Cosa, Annapaoloa; Del Burgo, Riccardo; Donato, Silvio; Galloni, Camilla; Hreus, Tomas; Leontsinis, Stefanos; Mikuni, Vinicius Massami; Neutelings, Izaak; Rauco, Giorgia; Robmann, Peter; Salerno, Daniel; Schweiger, Korbinian; Seitz, Claudia; Takahashi, Yuta; Wertz, Sebastien; Zucchetta, Alberto (2018). Measurement of the weak mixing angle using the forward-backward asymmetry of Drell-Yan events in pp collisions at $\sqrt{s}=13\,\text {TeV}$. European Physical Journal B: Condensed Matter and Complex Systems, C78(9):701.

Abstract

A measurement is presented of the effective leptonic weak mixing angle $\sin ^2\theta ^{\ell }_{\text {eff}}$ using the forward–backward asymmetry of Drell–Yan lepton pairs ($μμ$ and $e e$) produced in proton–proton collisions at $\sqrt s =8TeV$ at the CMS experiment of the LHC. The data correspond to integrated luminosities of $18.8$ and $19.6fb^{−1}$ 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 $\sin ^2\theta ^{\ell }_{\text {eff}}$from the combined dilepton data is $\sin ^2\theta ^{\ell }_{\text {eff}} =0.23101\pm 0.00036\,\text {(stat)} \pm 0.00018\,\text {(syst)} \pm 0.00016\,\text {(theo)} \pm 0.00031\,\text {(parton distributions in proton)}=0.23101 \pm 0.00053$.

Abstract

A measurement is presented of the effective leptonic weak mixing angle $\sin ^2\theta ^{\ell }_{\text {eff}}$ using the forward–backward asymmetry of Drell–Yan lepton pairs ($μμ$ and $e e$) produced in proton–proton collisions at $\sqrt s =8TeV$ at the CMS experiment of the LHC. The data correspond to integrated luminosities of $18.8$ and $19.6fb^{−1}$ 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 $\sin ^2\theta ^{\ell }_{\text {eff}}$from the combined dilepton data is $\sin ^2\theta ^{\ell }_{\text {eff}} =0.23101\pm 0.00036\,\text {(stat)} \pm 0.00018\,\text {(syst)} \pm 0.00016\,\text {(theo)} \pm 0.00031\,\text {(parton distributions in proton)}=0.23101 \pm 0.00053$.

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Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2018
Deposited On:19 Feb 2019 10:37
Last Modified:19 Sep 2019 10:41
Publisher:Springer
ISSN:1434-6028
OA Status:Green
Publisher DOI:https://doi.org/10.1140/epjc/s10052-018-6148-7

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