Abstract
We present a global analysis of the decay using the recent LHCb measurements of the primary observables and . Some of them exhibit large deviations with respect to the Standard Model (SM) predictions. We explain the observed pattern of deviations through a large new physics contribution to the Wilson coefficient of the semileptonic operator . This contribution has an opposite sign to the SM one, i.e., reduces the size of this coefficient significantly. A good description of data is achieved by allowing for new physics contributions to the Wilson coefficients and only. We find a deviation with respect to the SM prediction, combining the large-recoil observables with other radiative processes. Once low-recoil observables are included the significance gets reduced to . We have tested different sources of systematics, none of them modifying our conclusions significantly. Finally, we propose additional ways of measuring the primary observables through new foldings.
- Received 2 August 2013
DOI:https://doi.org/10.1103/PhysRevD.88.074002
© 2013 American Physical Society