PoS - Proceedings of Science
Volume 380 - Particles and Nuclei International Conference 2021 (PANIC2021) - Flavour physics - CKM and beyond
Subleading contributions in rare semileptonic $B^+ \to \pi^+ \ell^+ \ell^-$ decay
I. Parnova*, A. Ali and A.Y. Parkhomenko
Full text: pdf
Pre-published on: March 16, 2022
Published on:
In the Standard Model, the $b \to s$ and $b \to d$ flavor-changing neutral currents (FCNC) are induced by loop effects. Rare semileptonic $B$-meson decays originated by these currents are standard channels for testing the Standard Model precisely and in searching for possible physics beyond it.
Here, we consider the rare $B^+ \to \pi^+ \ell^+ \ell^-$ decay, where $\ell = \mu,\, \tau$ is a charged lepton, and present its dilepton invariant-mass spectrum and decay rate based on the effective electroweak Hamiltonian approach for the $b \to d \ell^+ \ell^-$ transitions in the Standard Model, taking into account weak annihilation and long-distance contributions, of which the later is from the light vector mesons.
Our prediction for the total branching fraction of $B^+ \to \pi^+ \mu^+ \mu^-$ agrees with the latest LHCb result within the experimental and theoretical uncertainties. Moreover, including the annihilation diagrams and contributions from the $\rho^0$- and $\omega$-resonances together gives better agreement with the experimental data in the low $q^2$-part of the dimuon mass spectrum.
We also present theoretical predictions for the total and partial branching fractions for $B^+ \to \pi^+ \tau^+ \tau^-$ in the Standard Model.
These results are potentially useful in testing the lepton flavor universality in the FCNC $B \to \pi \ell^+ \ell^-$ decays.
DOI: https://doi.org/10.22323/1.380.0158
How to cite

Metadata are provided both in "article" format (very similar to INSPIRE) as this helps creating very compact bibliographies which can be beneficial to authors and readers, and in "proceeding" format which is more detailed and complete.

Open Access
Creative Commons LicenseCopyright owned by the author(s) under the term of the Creative Commons Attribution-NonCommercial-NoDerivatives 4.0 International License.