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Publication - Dr Jeremy Dalseno

    First observation of B+→ D+s K+K decays and a search for B+ → D+s φ decays


    Adinolfi, M, Buchanan, E, Chapman, M, Cook, A, Dalseno, J, Harnew, S, Kariuki, J, Maddrell-Mander, S, Naik, P, Petridis, K, Pomery, G, Price, E, Prouve, C, Quagliani, R, Rademacker, J, Richards, S, Saunders, D, Skidmore, N, Velthuis, J & , 2018, ‘First observation of B+→ D+s K+K decays and a search for B+ → D+s φ decays’. Journal of High Energy Physics, vol 2018.


    A search for B+ → D s + K+K decays is performed using pp collision data corresponding to an integrated luminosity of 4.8 fb−1,
    collected at centre-of-mass energies of 7, 8 and 13 TeV with the LHCb
    experiment. A significant signal is observed for the first time and the
    branching fraction is determined to be


    the first uncertainty is statistical, the second systematic and the
    third due to the uncertainty on the branching fraction of the
    normalisation mode B+→D+sD¯¯¯¯0

    . A search is also performed for the pure annihilation decay B+ → D s + ϕ. No significant signal is observed and a limit of

    B(B+→D+sϕ)<4.9×10−7(4.2×10−7) is set on the branching fraction at 95% (90%) confidence level.

    Full details in the University publications repository