Determination of the ratio of b -quark fragmentation fractions f s /f d in pp collisions at √s =7 TeV with the ATLAS detector

ATLAS, Collaboration; Beck, Hans Peter; Cervelli, Alberto; Ereditato, Antonio; Haug, Sigve; Kabana, Sonja; Meloni, Federico; Mullier, Geoffrey André Adrien; Pretzl, Klaus-Peter; Stramaglia, Maria Elena; Stucci, Stefania; Weber, Michael (2015). Determination of the ratio of b -quark fragmentation fractions f s /f d in pp collisions at √s =7 TeV with the ATLAS detector. Physical review letters, 115(26), p. 262001. American Physical Society 10.1103/PhysRevLett.115.262001

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With an integrated luminosity of 2.47 fb⁻¹ recorded by the ATLAS experiment at the LHC, the exclusive decays B 0 s →J/ψϕ and B 0 d →J/ψK ∗0 of B mesons produced in pp collisions at √s=7 TeV are used to determine the ratio of fragmentation fractions f s /f d . From the observed B 0 s →J/ψϕ and B 0 d →J/ψK ∗0 yields, the quantity f s f d B(B 0 s →J/ψϕ)B(B 0 d →J/ψK ∗0 ) is measured to be 0.199 ± 0.004(stat) ± 0.008(sys). Using a recent theory prediction for B(B 0 s →J/ψϕ)B(B 0 d →J/ψK ∗0 ) yields f s f d = 0.240 ± 0.004(stat) ± 0.010(sys) ± 0.017(th). This result is based on a new approach that provides a significant improvement of the world average.

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