“School of Particles And Accelerator”

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Paper   IPM / Particles And Accelerator / 11912
School of Particles and Accelerator
  Title:   Expectations for first single-top studies in CMS in proton-proton collisions
  Author(s):  Mojtaba Mohammadi Najafabadi
  Status:   Published
  Journal: Conf. Ser.
  No.:  1
  Vol.:  295
  Year:  2011
  Pages:   012075
  Supported by:  IPM
The first long physics run of LHC is taking place at a center-of-mass energy of 7 TeV, and is expected to continue until an integrated luminosity of 1 inverse femtobarn will have been collected. We present an analysis technique to measure the t-channel cross section for single top-quark production in CMS, that can confirm the recent observation of single-top quark production by the Tevatron experiments. Events leading to a signature of exactly one muon and two jets are selected and specific data-driven methods have been developed to reduce the sensitivity to the unknown level of background contamination. Single top quarks provide the possibility to study the polarization of an " isolated quark". This feature is exploited in the presented analysis for the measurement of SM-like single top; with more statistics, the chiral structure of the W-t-b vertex could be probed via the study of the top polarization and any sizable deviation from the Standard Model expectation would be a hint to new physics beyond the Standard Model.

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