Search for Cp Violation in Top-Pair Events with Lepton+Jets Channel at √s=8TeV
Jui-Fa Tsai1*, Kai-Feng Chen1
1Department of Physics, National Taiwan University, Taipei, Taiwan
* presenting author:Jui-Fa Tsai, email:alpha78718@hep1.phys.ntu.edu.tw
We present the first measurement at the LHC of CP-violation asymmetries in ttbar events based on the T-odd triple product correlations. The analyzed data are collected by the CMS experiment from pp collisions at a center-of-mass energy √s=8 TeV and correspond to an integrated luminosity of 19.7 fb−1. The T-odd observables are measured using the linearly independent four-momentum vectors associated with the top quark production and decay. The measured asymmetries show no evidence for CP-violation effects in ttbar events, in agreement with the standard model prediction.


Keywords: cp violation , cms, lhc, top quark