Observation of $B_s^0\to K^{\ast \pm }{K}^{\mp }$ and evidence for $B_s^0\to K^{\ast -}{\pi }^{+}$ decays

Abstract

Measurements of the branching fractions of $B_s^0\to K^{\ast \pm }{K}^{\mp }$ and $B_s^0\to K^{\ast \pm }{\pi }^{\mp }$ decays are performed using a data sample corresponding to $1.0{\mathrm{fb}}^{-1}$ of proton-proton collision data collected with the LHCb detector at a centre-of-mass energy of $7\mathrm{TeV}$, where the $K^{\ast \pm }$ mesons are reconstructed in the $K_{\mathrm{S}}^0{\pi }^{\pm }$ final state. The first observation of the $B_s^0\to K^{\ast \pm }{K}^{\mp }$ decay and the first evidence for the $B_s^0\to K^{\ast -}{\pi }^{+}$ decay are reported with branching fractions \begin{eqnarray} {\cal B}(B^0_s \to K^{*\pm}K^\mp) & = & (12.7\pm1.9\pm1.9) \times 10^{-6}, \\ {\cal B}(B^0_s \to K^{*-}π^+) & = & ~(3.3\pm1.1\pm0.5) \times 10^{-6}, \end{eqnarray} where the first uncertainties are statistical and the second are systematic. In addition, an upper limit of $\mathcal{B}(B^0\to K^{\ast \pm }{K}^{\mp })<0.4(0.5)\times 10^{-6}$ is set at $90$ confidence level.

22 pages, 4 figures, published in New J. Phys

References in corpus (24)

• PYTHIA 6.4 Physics and Manual
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of summer 2016
• Performance of the LHCb Vertex Locator
• Differential branching fractions and isospin asymmetries of $B\to K^{(\ast )}{\mu }^{+}{\mu }^{-}$ decays
• Performance of the LHCb Outer Tracker
• Charmless non-leptonic B_s decays to PP, PV and VV final states in the pQCD approach
• Search for the decay $B_s^0\to {\overline{D}}^0{f}_0(980)$
• Measurement of CP violation in the phase space of $B^{\pm }\to K^{\pm }{\pi }^{+}{\pi }^{-}$ and $B^{\pm }\to K^{\pm }{K}^{+}{K}^{-}$ decays
• Measurement of CP violation in the phase space of $B^{\pm }\to K^{+}{K}^{-}{\pi }^{\pm }$ and $B^{\pm }\to {\pi }^{+}{\pi }^{-}{\pi }^{\pm }$ decays
• Measurements of $CP$ violation in the three-body phase space of charmless $B^{\pm }$ decays
• Measurement of CP Asymmetries and Branching Fractions in Charmless Two-Body B-Meson Decays to Pions and Kaons
• Sensitivity of searches for new signals and its optimization
• Measurements of Direct CP-Violating Asymmetries in Charmless Decays of Bottom Baryons
• Improved method for CKM constraints in charmless three-body B and B_s decays
• Amplitude Analysis of B0-->K+ pi- pi0 and Evidence of Direct CP Violation in B--> K* pi decays
• Searches for ${\Lambda }_b^0$ and ${\Xi }_b^0$ decays to $K_{\mathrm{S}}^{0}p{\pi }^{-}$ and $K_{\mathrm{S}}^{0}p{K}^{-}$ final states with first observation of the ${\Lambda }_b^0\to K_{\mathrm{S}}^{0}p{\pi }^{-}$ decay
• Measurement of the time-dependent CP asymmetry in B0 -> J/ψ KS0 decays
• Study of $B_{(s)}^0\to K_{\mathrm{S}}^0{h}^{+}{h}^{\prime -}$ decays with first observation of $B_s^0\to K_{\mathrm{S}}^0{K}^{\pm }{\pi }^{\mp }$ and $B_s^0\to K_{\mathrm{S}}^0{\pi }^{+}{\pi }^{-}$
• Hunting the CKM weak phase with time-integrated Dalitz analyses of Bs -> K pi pi decays
• Measurement of the effective B_s^0 -> J/ψ K_S^0 lifetime
• Evidence for the decay B0 --> K+K-pi0
• Measurement of the charge asymmetry in $B^{\pm }\to \varphi K^{\pm }$ and search for $B^{\pm }\to \varphi {\pi }^{\pm }$ decays
• Constraint on rho-bar, eta-bar from B to K*pi
• Observation of the $B_s^0\to J/\psi K_{\mathrm{S}}^0{K}^{\pm }{\pi }^{\mp }$ decay

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• Updating B --> PP, VP decays in the framework of flavor symmetry
• Precise measurement of the $f_s/f_d$ ratio of fragmentation fractions and of $B_s^0$ decay branching fractions
• Anatomy of $B_s\to PV$ decays and effects of next-to-leading order contributions in the perturbative QCD factorization approach
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• Revisiting $B_s\to PP$ and $PV$ Decays with Contributions from ${\varphi }_{B2}$ with perturbativen QCD approach
• Measurement of branching fraction and final-state asymmetry for the ${\bar{B}}^0\to K_S^0{K}^{\mp }{\pi }^{\pm }$ decay
• The virtual contributions from $K^{\ast }$ in the $B\to K^{\ast }\pi h$ and $B\to K\rho h$ decays