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Paper   IPM / Particles / 12143
School of Particles and Accelerator
Title:   Measurement of the weak mixing angle with the Drell-Yan process in proton-proton collisions at the LHC
Author(s):
 1 Hessamadin Arfaei 2 Hamed Bakhshiansohi 3 Seyed Mohsen Etesami 4 Ali Fahim 5 Majid Hashemi 6 Hoda Hesari 7 Abideh Jafari 8 Mohsen Khakzad 9 A Mohammadi 10 Mojtaba Mohammadi Najafabadi 11 Saeid Paktinat 12 Batool Safarzadeh 13 Maryam Zeinali
Status:   Published
Journal: Phys. Rev. D
No.:  112002
Vol.:  84
Year:  2011
Supported by:  IPM
Abstract:
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 sqrt(s)= 7 TeV collected by the CMS experiment at the LHC, corresponding to an integrated luminosity of 1.1 fb-1 . From the dominant uu-, dd - g* /Z - m- m+ process, the effective weak mixing angle parameter is measured to be sin 2qeff = 0.2287 +- 0.0020 (stat.)+- 0.0025 (syst.). This result is consistent with measurements from other processes, as expected within the standard model