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Publication - Professor Jonas Rademacker

    First observation of forward Z→bb¯ production in pp collisions at √s=8 TeV

    Citation

    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 forward Z→bb¯ production in pp collisions at √s=8 TeV’. Physics Letters B, vol 776., pp. 430-439

    Abstract

    The decay





    Z→bb¯
    is reconstructed in pp collision data, corresponding to 2 fb−1 of integrated luminosity, collected by the LHCb experiment at a centre-of-mass energy of





    s=8
    TeV. The product of the Z production cross-section and the





    Z→bb¯
    branching fraction is measured for candidates in the fiducial region defined by two particle-level b-quark jets with pseudorapidities in the range









    2.2<η<4.2
    , with transverse momenta





    pT>20
    GeV and dijet invariant mass in the range










    45<mjj<165
    GeV. From a signal yield of








    5462±763





    Z→bb¯
    events, where the uncertainty is statistical, a production cross-section times branching fraction of









    332±46±59
    pb is obtained, where the first uncertainty is statistical and the second systematic. The measured significance of the signal yield is 6.0 standard deviations. This measurement represents the first observation of the





    Z→bb¯
    production in the forward region of pp collisions.

    Full details in the University publications repository