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SUMMARY:Making the Unseen Seen: Rare B Decays with Invisible Signatures - 
 Dr Sally Stefkova\, Karlsruhe Institute of Technology
DTSTART:20260326T110000Z
DTEND:20260326T120000Z
UID:TALK245458@talks.cam.ac.uk
CONTACT:Matthew Kenzie
DESCRIPTION:Rare B-meson decays with invisible signatures are sensitive pr
 obes of physics beyond the Standard Model. The flavor-changing neutral cur
 rent decay B⁺ → K⁺ νν̄ is theoretically clean\, with a predicted 
 branching fraction of ~5×10−6 in the Standard Model. Various New Physic
 s scenarios\, including those involving dark matter candidates\, could sig
 nificantly enhance this rate. The most recent Belle II measurement reports
  a 4.6-fold enhancement over the Standard Model with compatibility of only
  2.7σ\,  providing an intriguing hint of New Physics.\nThis experimentall
 y challenging measurement is presented\, highlighting innovative methods f
 or background suppression and improved signal efficiency. A novel framewor
 k for reinterpretation of this measurement under alternative signal kinema
 tics is also introduced\, enabling robust tests of a broad class of New Ph
 ysics models.\nFinally\, the future prospects for this golden channel and 
 related B-meson decays with similar signatures are discussed. In that cont
 ext\, recent improvements in graph neural network–based methods for disp
 laced track and vertex reconstruction are highlighted.\nThese innovations 
 not only advance studies of B-meson decays at Belle II\, but also provide 
 broadly applicable tools for LHCb and beyond.
LOCATION:Lecture Theatre\, Level 2\, Ray Dolby Centre\, Cavendish Laborato
 ry\, JJ Thomson Avenue\, CB3 0US
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