Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC

Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC

A multivariate likelihood method to measure electroweak couplings with the Drell–Yan process at the LHC is presented. The process is described by the dilepton rapidity, invariant mass, and decay angle distributions. The decay angle ambiguity due to the unknown assignment of the scattered constituent...

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Bibliographic Details
Main Authors: Alver, Burak Han, Bendavid, Joshua L., Busza, Wit, Butz, Erik M., Cali, Ivan Amos, Chan, M., Dutta, Valentina, Everaerts, Pieter Bruno Bart, Gomez-Ceballos, Guillelmo, Goncharov, Maxim, Hahn, Kristian Allan, Kim, Y., Klute, Markus, Li, W., Ma, Teng, Nahn, Steven, Paus, Christoph M. E., Ralph, Duncan Kelley, Stephans, George S. F., Sung, Kevin Kai Hong, Wenger, Edward Allen, Xie, Si, Yilmaz, Yetkin, Yoon, A. S., Zanetti, Marco, Velicanu, Dragos Alexandru, Wyslouch, Boleslaw, Rudolph, Matthew Scott, Stoeckli, Fabian, Sumorok, Konstanty C, Wolf, Roger, Yang, Mingming, Bauer, Gerry P, Harris, Philip Coleman, Lee, Yen-Jie, Loizides, Constantinos, Luckey Jr, P David, Roland, Christof E, Roland, Gunther M
Other Authors: Massachusetts Institute of Technology. Department of Physics
Format: Article
Language:en_US
Published: American Physical Society 2012
Online Access:http://hdl.handle.net/1721.1/70112
https://orcid.org/0000-0002-3831-9071
https://orcid.org/0000-0003-3106-4894
https://orcid.org/0000-0001-6332-5839
https://orcid.org/0000-0001-8983-2169
https://orcid.org/0000-0002-1260-777X
https://orcid.org/0000-0002-6047-4211
https://orcid.org/0000-0003-3681-0649
https://orcid.org/0000-0003-2593-7767
https://orcid.org/0000-0002-0869-5631
Description
Summary:A multivariate likelihood method to measure electroweak couplings with the Drell–Yan process at the LHC is presented. The process is described by the dilepton rapidity, invariant mass, and decay angle distributions. The decay angle ambiguity due to the unknown assignment of the scattered constituent quark and antiquark to the two protons in a collision is resolved statistically using correlations between the observables. The method is applied to a sample of dimuon events from proton-proton collisions at √s=7  TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 1.1  fb[superscript -1]. From the dominant uu̅ , dd̅ -->γ[superscript *]/Z-->μ-μ+ process, the effective weak mixing angle parameter is measured to be sin[superscript ⁡2]theta[subscript eff]=0.2287±0.0020(stat.)±0.0025 (syst.). This result is consistent with measurements from other processes, as expected within the standard model.

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