First Observation of the Rare Purely Baryonic Decay B0→pp.

M. Adinolfi, M. Alexander, S. Ali, A. A. Alves, J. E. Andrews, R. J. Barlow, S. Benson, T. Blake, E. Bowen, E. Buchanan, C. Burr, S. Chen, S. F. Cheung, P. E.L. Clarke, J. Cogan, V. Cogoni, P. Collins, G. Coombs, J. Dalseno, A. DavisL. De Paula, L. Douglas, H. M. Evans, T. Evans, D. Ferguson, M. Frank, J. Fu, V. Gibson, X. Han, S. T. Harnew, J. Harrison, M. Hatch, J. He, L. Henry, D. Hill, D. Johnson, J. M. Kariuki, U. Marconi, P. Naik, K. Petridis, G. J. Pomery, C. Prouve, R. Quagliani, J. H. Rademacker, V. Rives Molina, D. M. Saunders, N. Skidmore, J. J. Velthuis, C. Wallace, F. F. Wilson, LHCb Collaboration

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The first observation of the decay of a B0 meson to a purely baryonic final state, B0→pp, 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 B(B0→pp)=(1.25±0.27±0.18)×10-8, where the first uncertainty is statistical and the second systematic. The decay mode B0→pp is the rarest decay of the B0 meson observed to date. The decay Bs0→pp is also investigated. No signal is seen and the upper limit B(Bs0→pp)<1.5×10-8 at 90% confidence level is set on the branching fraction.

Original languageEnglish
Article number232001
JournalPhysical Review Letters
Issue number23
Publication statusPublished - 4 Dec 2017

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    Bristol Consolidated Grant 2015-9

    Goldstein, J.


    Project: Research

    Cite this

    Adinolfi, M., Alexander, M., Ali, S., Alves, A. A., Andrews, J. E., Barlow, R. J., Benson, S., Blake, T., Bowen, E., Buchanan, E., Burr, C., Chen, S., Cheung, S. F., Clarke, P. E. L., Cogan, J., Cogoni, V., Collins, P., Coombs, G., Dalseno, J., ... LHCb Collaboration (2017). First Observation of the Rare Purely Baryonic Decay B0→pp. Physical Review Letters, 119(23), [232001].