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Publication - Dr Jaap Velthuis

    Measurement of the Ratio of Branching Fractions B (Bc+ →j /ψτ+ντ)/ B (Bc+ →j /ψμ+νμ)

    Citation

    Adinolfi, M, Buchanan, E, Chapman, M, Cook, J, Dalseno, J, Harnew, S, Kariuki, J, Naik, P, Petridis, K, Pomery, G, Prouve, C, Quagliani, R, Rademacker, J, Richards, S, Saunders, D, Skidmore, N, Velthuis, J & , 2018, ‘Measurement of the Ratio of Branching Fractions B (Bc+ →j /ψτ+ντ)/ B (Bc+ →j /ψμ+νμ)’. Physical Review Letters, vol 120.

    Abstract

    A measurement is reported of the ratio of branching fractions R(J/ψ)=B(Bc+→J/ψτ+ντ)/B(Bc+→J/ψμ+νμ), where the τ+ lepton is identified in the decay mode τ+→μ+νμντ. This analysis uses a sample of proton-proton collision data corresponding to 3.0 fb-1 of integrated luminosity recorded with the LHCb experiment at center-of-mass energies of 7 and 8 TeV. A signal is found for the decay Bc+→J/ψτ+ντ at a significance of 3 standard deviations corrected for systematic uncertainty, and the ratio of the branching fractions is measured to be R(J/ψ)=0.71±0.17(stat)±0.18(syst). This result lies within 2 standard deviations above the range of central values currently predicted by the standard model.

    Full details in the University publications repository