# 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).
Type de document :
Article dans une revue
Physical Review Letters, American Physical Society, 2015, 115, pp.262001 〈10.1103/PhysRevLett.115.262001〉

http://hal.in2p3.fr/in2p3-01185501
Contributeur : Claudine Bombar <>
Soumis le : jeudi 20 août 2015 - 14:23:12
Dernière modification le : mardi 24 juillet 2018 - 15:46:14

### 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〉

### Métriques

Consultations de la notice