Revealing new physics in {varvec{B}}^{0}_{s}rightarrow D_s^{mp } K^{pm } decays

Abstract

The B^0_srightarrow D_s^{mp } K^{pm } system offers a determination of the Unitarity Triangle angle gamma . Intrigued by an LHCb analysis showing a surprisingly large result in tension with information on the Unitarity Triangle and other gamma measurements, we make a transparent study of the measured observables, confirming the LHCb picture. The corresponding gamma puzzle at the 3sigma level would require CP-violating contributions of New Physics, which should also manifest themselves in the corresponding decay branching ratios. Indeed, we find that the rates of the individual B^0_srightarrow D_s^{mp } K^{pm } channels show puzzling patterns, in accordance with similar decays, with tensions up to 4.8sigma , thereby making the situation much more exciting. We present a formalism to include New-Physics effects in a model-independent way and apply it to the data to constrain the corresponding parameters. Interestingly, new contributions of moderate size could accommodate the data. Utilising this formalism in the future high-precision B physics era may allow us to finally establish new sources of CP violation.