# Determination of the ratio of $b$-quark fragmentation fractions $f_s/f_d$ in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector

Abstract : With an integrated luminosity of 2.47 fb$^{-1}$ recorded by the ATLAS experiment at the LHC, the exclusive decays $B_{s}^{0}\rightarrow J/\psi\phi$ and $B_{d}^{0}\rightarrow J/\psi K^{*0}$ of $B$ mesons produced in $pp$ collisions at $\sqrt{s}=7$ TeV are used to determine the ratio of fragmentation fractions $f_s/f_d$. From the observed yields of 6640 $\pm$ 100(stat) $\pm$ 220(sys) $B_{s}^{0} \rightarrow J/\psi\phi$ events and 36290 $\pm$ 320(stat) $\pm$ 650(sys) $B_{d}^{0}\rightarrow J/\psi K^{*0}$ events, the quantity $\frac{f_s}{f_d}\frac{\mathcal{B}(B_{s}^{0} \rightarrow J/\psi \phi)}{\mathcal{B}(B_{d}^{0} \rightarrow J/\psi K^{*0})}$ is estimated to be 0.199 $\pm$ 0.004(stat) $\pm$ 0.010(sys).
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http://hal.in2p3.fr/in2p3-01185501
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Submitted on : Thursday, August 20, 2015 - 2:23:12 PM
Last modification on : Tuesday, November 5, 2019 - 4:32:43 PM

### Citation

G. Aad, Z. Barnovska, N. Berger, M. Delmastro, L. Di Ciaccio, et al.. Determination of the ratio of $b$-quark fragmentation fractions $f_s/f_d$ in $pp$ collisions at $\sqrt{s}=7$ TeV with the ATLAS detector. Physical Review Letters, American Physical Society, 2015, 115, pp.262001 ⟨10.1103/PhysRevLett.115.262001⟩. ⟨in2p3-01185501⟩

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