Speaker
Diego Guadagnoli
(Annecy, LAPTH)
Description
Kinematic variables designed for pairwise decays to partly undetected final states---the mother of which variables is perhaps the Cambridge M_{(T)2}---have been extensively used in high-p_T collider searches, in particular of supersymmetry. A new range of potential applications at flavour facilities was recently pointed out in 2106.16236.
We discuss two novel constraints that can be imposed on M_2. We apply them to the benchmark search B -> K tau mu at Belle II. We show that the strategy allows to fully close the kinematics in semi-leptonic tag events, making them as efficient as hadronic tag ones, and effectively doubling the statistics.
