Speaker
Description
18+2'
The large masses of B mesons allow them to decay into baryonic final states. The first observations and studies of such baryonic B decays were performed by the ARGUS and CLEO experiments in the 1990s.
The LHCb collaboration has measured the branching fractions of the decays $B^0$ and $B^0_s \to p \bar{p} p \bar{p}$ to be of the order of $10^{-8}$ using Run 1+2 datasets corresponding to an integrated luminosity of 9 $fb^{-1}$, with significances of 9.3σ and 4.0σ, respectively. In the charm sector, the BESII collaboration observed the kinematically allowed decay $D_{s}^+ \to p \bar{n} $ and has searched for the decay $D_s^+ \to p \bar{p} e^{+} ν_{e}$.
Baryonic B decays provide a unique opportunity to study several interesting phenomena, such as: Threshold enhancement - an effect observed in three- and four-body decay modes as an enhancement near the baryon–antibaryon invariant mass threshold; multiplicity effects - the observed hierarchy between the branching fractions of two-body and multi-body final states.
In this talk, I will summarise the Run 2 LHCb analysis of the decays $B^0$ and $B^0_s \to p \bar{p} p \bar{p}$, and share some perspectives to Run 3.
