Abstract
We explore semileptonic decays to the four lightest excited charm mesons, , for nonzero charged lepton mass and for all four-Fermi interactions, including calculation of the and corrections to the heavy quark limit for all form factors. In the heavy quark limit, some form factors are suppressed at zero recoil; therefore, the corrections can be very important. The rates exhibit sensitivities to new physics in mediated decays complementary to the and modes. Since they are also important backgrounds to , the correct interpretation of future semitauonic rate measurements requires consistent treatment of both the backgrounds and the signals. Our results allow more precise and more reliable calculations of these decays and are systematically improvable by better data on the and modes. As an example, we show that the rates are more sensitive to a new tensor interaction than the rates.
- Received 3 December 2017
DOI:https://doi.org/10.1103/PhysRevD.97.075011
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