Flavor Probes of New Physics during LHC Run 2 Period

Abstract

LHC Run 2 would collide at 13 TeV by summer, and collect 100 fb-1 by 2018. With the backdrop of "No New Physics" at Run 1, and the flavor front sharing the disappointment, the energy increase at Run 2 gives us hope, though diminished, for observing New Physics. In this talk, the speaker reviews the current front lines of B_q -> mu+mu-, CPV phase phi_s, and P5' in B -> K*mumu angular observables, as well as the so-called "BaBar anomaly" in B -> D^(*) tau nu, with implications for flavor changing neutral Higgs couplings. The latter brings in the new flavor frontier involving the Top and Higgs, motivating the search for t -> cH as well as H -> mu tau, and we also touch upon t -> cZ, as well as t -> cZ'. The Z' from gauged L_mu - L_tau has two flavor incarnations: that of heavy Z' related to P5', or a very light (< 400 MeV!) Z' related to muon g-2 anomaly (but not both). The latter brings about a potential surprise in the oldest flavor front: kaons. It is found that K_L -> pi0 Z' could "evade" the so-called Grossman-Nir bound, allowing the KOTO experiment to flirt with discovery during LHC Run 2 period, with BaBar/Belle(2), NA62, LHCb all in the game. He closes with some comments on Baryon Number Violation, Origin of Flavor, and Baryon Asymmetry of Universe.