HEP / Particle Astro seminar

Wed, Apr 24, 2024 4:00 pm - 5:00 pm
PSC 3150


Speaker:  Claudia Cecchi (Perugia)

Title:  B+-> k+ nu nu and other highlights from Belle II experiment at SuperKEKB.

Abstract:  The Belle II detector, at the SuperKEKB accelerator (Tsukuba, Japan) started taking data in 2019 with the goal of extending the physics reach of its predecessor, Belle, by collecting 50 ab^-1 of data reaching the design luminosity of the machine of 6 * 10^35 cm^-2 s^-1.  With this data set Belle II will be able to explore flavor physics with B, charmed mesons, and tau leptons.  Belle II has also a unique capability to search for low-mass dark matter and low-mass mediators.In this seminar we will survey selected physics highlights from the Belle II experiment, based on the Run1 data set corresponding to 362 fb^−1, concentrating in particular on our recent measurement of B^+ --> k^+ nu nu.  The decay  B^+ --> k^+ nu nu is mediated by a flavor-changing neutral current with a predicted branching fraction, in the Standard Model, of about 6 * 10^-5, while enhancements are foreseen in New Physics scenarios.  The status and schedule of the experiment after the Long Shutdown 1 (LS1), from July 2022 to December 2023, is also presented.