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Paper   IPM / Particles / 12260
School of Particles and Accelerator
  Title:   Single top quark production in t-channel at the LHC in Noncommutative Space-Time
  Author(s): 
1.  Seyed Yaser Ayazi
2.  Sina Esmaeili
3.  Mojtaba Mohammadi Najafabadi
  Status:   Published
  Journal: Phys. Lett. B
  Vol.:  712
  Year:  2012
  Pages:   93-96
  Supported by:  IPM
  Abstract:
We study the production cross section of the t-channel single top quark at the LHC in the noncommutative space-time. It is shown that the deviation of the t-channel single top cross section from the Standard Model value because of noncommutativity is significant when |θ| >~10−4 GeV−2. Using the present experimental precision in measurement of the t-channel cross section, we apply upper limit on the noncommutative parameter. When a single top quark decays, there is a significant amount of angular correlation, in the top quark rest frame between the top spin direction and the direction of the charged lepton momentum from its decay. We study the effect of noncommutativity on the spin correlation and we find that depending on the noncommutative scale, the angular correlation can enhance considerably. Then, we provide limits on the noncommutative scale for various possible relative uncertainties on the spin correlation measurement

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