| HAL : in2p3-00698159, version 1 |
| arXiv : 1205.3422 |
| DOI : 10.1007/JHEP07(2012)133 |
| Fiche détaillée | Récupérer au format |
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| Journal of High Energy Physics 07 (2012) 133 |
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| Measurement of the isospin asymmetry in $B \to K^{(*)}\mu^+\mu^-$ decays |
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| LHCb Collaboration(s) |
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| (2012) |
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| The isospin asymmetries of $B \to K^{(*)}\mu^+\mu^-$ decays and the partial branching fractions of $B^0 \to K^0\mu^+\mu^-$ and $B^+ \to K^{*+}\mu^+\mu^-$ are measured as a function of the di-muon mass squared $q^2$ using an integrated luminosity of 1.0 fb$^{-1}$ collected with the LHCb detector. The $B \to K\mu^+\mu^-$ isospin asymmetry integrated over $q^2$ is negative, deviating from zero with over 4 $\sigma$ significance. The $B \to K^{*}\mu^+\mu^-$ decay measurements are consistent with the Standard Model prediction of negligible isospin asymmetry. The observation of the decay $B^0 \to K^0_{\rm\scriptscriptstyle S}\mu^+\mu^-$ is reported with 5.7 $\sigma$ significance. Assuming that the branching fraction of $B^0 \to K^0\mu^+\mu^-$ is twice that of $B^0 \to K^0_{\rm\scriptscriptstyle S}\mu^+\mu^-$, the branching fractions of $B^0 \to K^0\mu^+\mu^-$ and $B \to K^{*+}\mu^+\mu^-$ are found to be ($0.31^{+0.07}_{-0.06}) \times 10^{-6}$ and ($1.16\pm0.19) \times 10^{-6}$, respectively. |
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| Thème(s) | : | Physique/Physique des Hautes Energies - Expérience |
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| Lien vers le texte intégral : |
| in2p3-00698159, version 1 | |
| http://hal.in2p3.fr/in2p3-00698159 | |
| oai:hal.in2p3.fr:in2p3-00698159 | |
| Contributeur : Françoise Marechal | |
| Soumis le : Mercredi 16 Mai 2012, 14:02:56 | |
| Dernière modification le : Mardi 6 Novembre 2012, 15:17:23 | |