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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
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
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

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