Lepton polarization asymmetries in rare semi-tauonic $$ b rightarrow s $$ exclusive decays at FCC- ee |
| |
Authors: | J. F. Kamenik S. Monteil A. Semkiv L. Vale Silva |
| |
Affiliation: | 1.Jo?ef Stefan Institute,Ljubljana,Slovenia;2.Faculty of Mathematics and Physics,University of Ljubljana,Ljubljana,Slovenia;3.Université Clermont Auvergne, CNRS/IN2P3, LPC,Clermont-Ferrand,France;4.Taras Shevchenko National University of Kyiv,Kyiv,Ukraine |
| |
Abstract: | We consider measurements of exclusive rare semi-tauonic b-hadron decays, mediated by the (b rightarrow s tau ^+ tau ^-) transition, at a future high-energy circular electron–positron collider (FCC-ee). We argue that the high boosts of b-hadrons originating from on-shell Z boson decays allow for a full reconstruction of the decay kinematics in hadronic (tau ) decay modes (up to discrete ambiguities). This, together with the potentially large statistics of (Zrightarrow bbar{b}), opens the door for the experimental determination of (tau ) polarizations in these rare b-hadron decays. In the light of the current experimental situation on lepton flavor universality in rare semileptonic B decays, we discuss the complementary short-distance physics information carried by the (tau ) polarizations and suggest suitable theoretically clean observables in the form of single- and double-(tau ) polarization asymmetries. |
| |
Keywords: | |
本文献已被 SpringerLink 等数据库收录! |
|