1. Measuring CP violation in rare $W$ decays at the LHC
- Author
-
Peng-Cheng Lu, Zong-Guo Si, Zhe Wang, and Xing-Hua Yang
- Subjects
Nuclear and High Energy Physics ,High Energy Physics - Phenomenology ,High Energy Physics - Phenomenology (hep-ph) ,Physics::Instrumentation and Detectors ,High Energy Physics::Phenomenology ,FOS: Physical sciences ,Astronomy and Astrophysics ,High Energy Physics::Experiment ,Instrumentation - Abstract
Heavy Majorana neutrinos beyond the standard model can simultaneously explain the origin of tiny neutrino masses and matter-antimatter asymmetry in our Universe. The existence of heavy Majorana neutrinos will also lead to lepton number violation and the rare lepton-number-violating $W$ decays are possible. With contributions from two different Majorana neutrinos, a nonzero CP asymmetry may be generated from the rate difference between $W$ decay and its CP-conjugate process. The aim of this paper is to investigate the prospects for measuring CP violation in rare $W$ decays via Majorana neutrinos at the LHC. Our calculations show that the induced CP asymmetry is independent of the Majorana neutrino mass for $10~ \rm GeV < m_N < 70 ~\rm GeV$. Such a CP asymmetry if observed, would in turn provide unambiguous evidence of new physics beyond the standard model., 15 pages,6 Figures, 1 Table
- Published
- 2022