First observation of the rare purely baryonic decay $B^0\to p\bar{p}$

Abstract

The first observation of the decay of a $B^0$ meson to a purely baryonic final state, $B^0\to p\bar{p}$, is reported. The proton-proton collision data sample used was collected with the LHCb experiment at center-of-mass energies of 7 and 8 TeV and corresponds to an integrated luminosity of 3.0 fb${}^{-1}$. The branching fraction is determined to be $$\mathcal{B}(B^0\to p\bar{p})=(1.25\pm 0.27\pm 0.18)\times 10^{-8},$$ where the first uncertainty is statistical and the second systematic. The decay mode $B^0\to p\bar{p}$ is the rarest decay of the $B^0$ meson observed to date. The decay $B_s^0\to p\bar{p}$ is also investigated. No signal is seen and the upper limit $\mathcal{B}(B_s^0\to p\bar{p})<1.5\times 10^{-8}$ at 90% confidence level is set on the branching fraction.

'All figures and tables, along with any supplementary material and additional information, are available at https://lhcbproject.web.cern.ch/lhcbproject/Publications/LHCbProjectPublic/LHCb-PAPER-2017-022.html

References in corpus (6)

• PYTHIA 6.4 Physics and Manual
• Performance of the LHCb Vertex Locator
• Direct CP violation in $B^{\pm }\to p\bar{p}{K}^{(\ast )\pm }$
• Violation of PCAC and two-body baryonic $B$ and $D_s$ decays
• On the smallness of Tree-dominated Charmless Two-body Baryonic $B$ Decay Rates
• Search for B^0-> p p-bar, Lambda Lambda-bar and B^+ -> p Lambda-bar at Belle

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• Study of charmless two-body baryonic $B$ decays
• Angular asymmetries in $B\to \Lambda \bar{p}M$ decays
• Hadronic rescattering to solve helicity puzzle in $B^{+}\to p\bar{p}{\pi }^{+}(K^{+})$ decays
• Observation of the rare baryonic decay $B^{+}\to p\bar{\Lambda }$ and measurement of its weak decay parameter