[Seminars] HEP lunch talk today - Matt Bellis

Antonio Boveia boveia at hep.uchicago.edu
Mon Feb 7 09:28:54 CST 2011

The lunch speaker today is Matt Bellis from Stanford. He'll discuss "A search for baryon and lepton number violation in B decays using the BaBar dataset." Join us in HEP 323 at 12:15pm.


> From 1999-2008, the BaBar experiment collected data from e+e− colli- sions running at the Υ(4S) resonance. This provided analysts with 1 billion B mesons with which to probe a wide variety of physics. This talk will present the results of a search for a B meson decaying to a baryon and a lepton, where the baryon is either a Λc or Λ, and the lepton is a muon or an electron. This is the first search for these processes and observation of a signal would indicate new physics beyond the standard model. The search is performed using a blind analysis technique, whereby the signal region of interest is hidden from the analysts until the very end. No significant sig- nal is observed in any of the decay modes, and upper limits in the range (3.2 − 520) × 10−8 are set on the branching fractions at the 90% confidence level.

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