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Speaker: Slavomira Stefkova (Karlsruhe Institute of Technology) – Title: Glimpse of a Rare B Decay with Two Invisible Neutrinos at Belle II
April 11 @ 4:00 pm - 5:00 pm
Research Progress Meeting
Date: April 11, 2024
Time: 4:00- 5:00 pm
Location: Sessler Conference Room- 50A-5132 [In-Person and HYBRID]
Speaker: Slavomira Stefkova (Karlsruhe Institute of Technology)
Title: Glimpse of a Rare B Decay with Two Invisible Neutrinos at Belle II
Abstract: The decay of B+→K+νν̄ is mediated by flavor-changing neutral current. In the Standard Model, the rate for this elusive process is predicted to be 6×10^-6, while enhancements are foreseen in many New Physics models. Searching for B+→K+νν̄ decays is, however, experimentally challenging as this decay is not only rare but also contains two neutrinos, leaving no signature in the detector. In this talk, I will show you details of the newest measurement of the rate of B+→K+νν̄ decays, which is based on 362 fb^-1 of SuperKEKB electron-positron collision data collected at the Upsilon(4S) resonance by the Belle II experiment in Tsukuba, Japan. Using two different but complementary reconstruction techniques, we found, for the first time, evidence for the B+→K+νν̄ process. At the end of my talk, I will highlight other future opportunities in B-decays with invisible signatures.
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https://lbnl.zoom.us/j/98854322464?pwd=K2tKUm1VZjRlV1J5RHE3cXdHQzRxdz09
Meeting ID: 988 5432 2464
Passcode: 142239