Time-reversal asymmetries in semileptonic decays
Chao-Qiang Geng (School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China and University of Chinese Academy of Sciences, 100190 Beijing, China); Xiang-Nan Jin (School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China and University of Chinese Academy of Sciences, 100190 Beijing, China); Chia-Wei Liu (School of Fundamental Physics and Mathematical Sciences, Hangzhou Institute for Advanced Study, University of Chinese Academy of Sciences, Hangzhou 310024, China and University of Chinese Academy of Sciences, 100190 Beijing, China)
We study the decays of with , , , where and are the daughter baryon and the rest of the particles in cascade decays, respectively. In particular, we examine the full angular distributions with polarized and lepton mass effects, in which the time-reversal asymmetries are identified. We concentrate on the decay modes of to demonstrate their experimental feasibility. We show that the observables associated with the time-reversal asymmetries are useful to search for new physics as they vanish in the standard model. We find that they are sensitive to the right-handed current from new physics, and possible to be observed at LHCb.