The first observation of the decay $\kstarkstar$ is reported using 35\invpb of data collected by LHCb in proton-proton collisions at a centre-of-mass energy of 7 TeV. A total of $49.8 \pm 7.5$ $B^0_s \rightarrow (K^+\pi^-)(K^-\pi^+)$ events are {observed within $\pm 50 \mevcc$ of the \Bs mass and $746 \mevcc < m_{K\pi}< 1046 \mevcc$, mostly coming from a resonant $\kstarkstar$ signal.} The branching fraction and the \CP-averaged \Kstarz longitudinal polarization fraction are measured to be {$\BR(\kstarkstar) = (2.81 \pm 0.46 ({\rm stat.}) \pm 0.45 ({\rm syst.}) \pm 0.34\, (f_s/f_d))\times10^{-5}$} and $f_L = 0.31 \pm 0.12 ({\rm stat.}) \pm 0.04 ({\rm syst.})$

Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., et al. (2012). First observation of the decay $\mathbf{B^0_s \rightarrow K^{*0}\bar{K}^{*0}}$,. PHYSICS LETTERS. SECTION B, 709(1-2), 50-58 [10.1016/j.physletb.2012.02.001].

First observation of the decay $\mathbf{B^0_s \rightarrow K^{*0}\bar{K}^{*0}}$,

CALVI, MARTA;FANCHINI, ERICA;GIACHERO, ANDREA;
2012

Abstract

The first observation of the decay $\kstarkstar$ is reported using 35\invpb of data collected by LHCb in proton-proton collisions at a centre-of-mass energy of 7 TeV. A total of $49.8 \pm 7.5$ $B^0_s \rightarrow (K^+\pi^-)(K^-\pi^+)$ events are {observed within $\pm 50 \mevcc$ of the \Bs mass and $746 \mevcc < m_{K\pi}< 1046 \mevcc$, mostly coming from a resonant $\kstarkstar$ signal.} The branching fraction and the \CP-averaged \Kstarz longitudinal polarization fraction are measured to be {$\BR(\kstarkstar) = (2.81 \pm 0.46 ({\rm stat.}) \pm 0.45 ({\rm syst.}) \pm 0.34\, (f_s/f_d))\times10^{-5}$} and $f_L = 0.31 \pm 0.12 ({\rm stat.}) \pm 0.04 ({\rm syst.})$
Articolo in rivista - Articolo scientifico
LHCb; B Physics
English
2012
709
1-2
50
58
none
Aaij, R., Abellan Beteta, C., Adeva, B., Adinolfi, M., Adrover, C., Affolder, A., et al. (2012). First observation of the decay $\mathbf{B^0_s \rightarrow K^{*0}\bar{K}^{*0}}$,. PHYSICS LETTERS. SECTION B, 709(1-2), 50-58 [10.1016/j.physletb.2012.02.001].
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/10281/45997
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