Motivated by flavor non-universality and anomalies in semi-leptonic B-meson decays, we present a general and systematic discussion about how to construct anomaly-free U（1）＇ gauge theories based on an extended stand...Motivated by flavor non-universality and anomalies in semi-leptonic B-meson decays, we present a general and systematic discussion about how to construct anomaly-free U（1）＇ gauge theories based on an extended standard model with only three right-handed neutrinos. If all standard model fermions are vector-like under this new gauge symmetry, the most general family non-universal charge assignments, （a,b,c） for three-generation quarks and （d,e,f） for leptons, need satisfy just one condition to be anomaly-free, a（a＋b＋c）= （d＋e＋f）. Any assignment can be linear combinations of five independent anomaly-free solutions. We also illustrate how such models can generally lead to ttavor-changing interactions and easily resolve the anomalies in B-meson decays. Probes with Bs-Bs mixing, decay into τ±, dilepton and dijet searches at colliders are also discussed.展开更多
基金Supported by the Grant-in-Aid for Innovative Areas(16H06490)
文摘Motivated by flavor non-universality and anomalies in semi-leptonic B-meson decays, we present a general and systematic discussion about how to construct anomaly-free U（1）＇ gauge theories based on an extended standard model with only three right-handed neutrinos. If all standard model fermions are vector-like under this new gauge symmetry, the most general family non-universal charge assignments, （a,b,c） for three-generation quarks and （d,e,f） for leptons, need satisfy just one condition to be anomaly-free, a（a＋b＋c）= （d＋e＋f）. Any assignment can be linear combinations of five independent anomaly-free solutions. We also illustrate how such models can generally lead to ttavor-changing interactions and easily resolve the anomalies in B-meson decays. Probes with Bs-Bs mixing, decay into τ±, dilepton and dijet searches at colliders are also discussed.
