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Paper   IPM / Particles / 13527
School of Particles and Accelerator
  Title:   Direct photon production as a probe of quarks chromoelectric and chromomagnetic dipole moments at the LHC
1.  Hoda Hesari
2.  Mojtaba Mohammadi Najafabadi
  Status:   Published
  Journal: Phys. Rev. D
  No.:  057502
  Vol.:  91
  Year:  2015
  Supported by:  IPM
In this paper we show that the y+jet invariant mass distribution in proton-proton collisions at the LHC is significantly sensitive to the quarks chromoelectric (K) and chromomagnetic (K) dipole moments. It is shown that the presence of K or K leads to an increment of the cross section of y+jet process in particular in the tail of y+jet invariant mass distribution. Using the measured y+jet invariant mass distribution by the CMS experiment at the center-of-mass energy of 8 TeV, we derive bounds on the quarks chromoelectric and chromomagnetic dipole moments. In extraction of the limits, we consider both theoretical and systematic uncertainties. The uncertainties originating from variation of the renomalization/factorization scales and the choice of proton parton distribution functions are taken into account as a function of the y+jet invariant mass. We exclude K or K above 10-5 at 95

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