4–11 Jul 2018
COEX, SEOUL
Asia/Seoul timezone

Search for the rare decay $B \to \Lambda \bar{p} \nu \bar{\nu}$

5 Jul 2018, 14:20
20m
102 (COEX, Seoul)

102

COEX, Seoul

Parallel Quark and Lepton Flavor Physics Quark and Lepton Flavor Physics

Speaker

Robert Seddon (McGill University)

Description

We search for the rare flavor-changing neutral current process $B^- \to \Lambda \bar{p} \nu \bar{\nu}$ using data from the BABAR experiment. A total of 424fb$^{−1}$ of $e^+e^−$ collision data collected at the center-of-mass energy of the $\Upsilon(4S)$ resonance is used in this study, corresponding to a sample of $(471\pm3)\times 10^6$ $B-\bar{B}$ pairs. Signal $B^- \to \Lambda \bar{p} \nu \bar{nu}$ candidates are identified by first exclusively reconstructing a $B^+$ decay in one of many possible decays to hadronic final states, then examining detector activity that is not associated with this reconstructed $B^-$ decay for evidence of a signal decay. The data yield is found to be consistent with the expected background contribution under a null signal hypothesis, resulting in an estimated branching fraction of $\cal{B}(B^-\to\Lambda\bar{p}\nu\bar{\nu}) = (0.4\pm1.1\pm0.6)\times10^{−5}$, where the uncertainties are statistical and systematic, respectively. An upper limit of $\cal{B}(B^-\to\Lambda\bar{p}\nu\bar{\nu}) < 3.0\times10^{−5}$ at the $90\%$ confidence level is determined.

Primary authors

Fabio Anulli (Sapienza Universita e INFN, Roma I (IT)) Robert Seddon (McGill University)

Presentation materials