Abstract
In recent years experiments revealed intriguing hints for new physics (NP) in decays involving and transitions at the and level, respectively. In addition, there are slight disagreements in and observables. While not significant on their own, they point in the same direction. Furthermore, extracted from decays shows a slight tension () with its value determined from Cabibbo-Kobayashi-Maskawa unitarity, and an analysis of BELLE data found an excess in . Concerning NP explanations, the vector leptoquark SU(2) singlet is of special interest since it is the only single particle extension of the standard model which can (in principle) address all the anomalies described above. For this purpose, large couplings to leptons are necessary and loop effects, which we calculate herein, become important. Including them in our phenomenological analysis, we find that neither the tension in nor the excess in can be fully explained without violating bounds from . However, one can account for and data finding intriguing correlations with and . Furthermore, the explanation of predicts a positive shift in and a negative one in , being nicely in agreement with the global fit to data. Finally, we point out that one can fully account for and without violating bounds from , , or processes.
- Received 20 July 2018
DOI:https://doi.org/10.1103/PhysRevLett.122.011805
Published by the American Physical Society under the terms of the Creative Commons Attribution 4.0 International license. Further distribution of this work must maintain attribution to the author(s) and the published article’s title, journal citation, and DOI. Funded by SCOAP3.
Published by the American Physical Society