Observation of $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$

Abstract

We report the first observation of the flavor-changing neutral current decay $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ and an improved measurement of the decay $B\to K{\ell }^{+}{\ell }^{-}$, where $\ell$ represents an electron or a muon, with a data sample of 140 fb${}^{-1}$ accumulated at the ${\rm Y}(4S)$ resonance with the Belle detector at KEKB. The results for the branching fractions are $\mathcal{B}(B\to K^{\ast }{\ell }^{+}{\ell }^{-})=(11.5_{-2.4}^{+2.6}\pm 0.8\pm 0.2)\times 10^{-7}$ and $\mathcal{B}(B\to K{\ell }^{+}{\ell }^{-})=(4.8_{-0.9}^{+1.0}\pm 0.3\pm 0.1)\times 10^{-7}$, where the first error is statistical, the second is systematic and the third is from model dependence.

arXiv comment11 pages, 2 figures, submitted to PRL

References in corpus (18)

• Branching Fraction and Photon Energy Spectrum b -> s gamma
• Quark mass effects in B -> Xs gamma
• A Measurement of the Branching Fraction for the Inclusive B --> X(s) gamma Decays with the Belle Detector
• Improved Model-Independent Analysis of Semileptonic and Radiative Rare B Decays
• Searching for supersymmetry in rare B decays
• QCD Sum Rule Analysis of the Decays $B\to K{\ell }^{+}{\ell }^{-}$ and $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$
• Two-loop virtual corrections to B --> X_s l^+ l^- in the standard model
• Matching Conditions for $b\to s\gamma$ and $b\to sgluon$ in Extensions of the Standard Model
• B -> Xs l+ l- decays in supersymmetry
• Testing the Standard Model in $B\to K^{(\ast )}{\ell }^{+}{\ell }^{-}$
• Observation of the Decay $B\to K{\ell }^{+}{\ell }^{-}$
• $b\to sl\bar{l}$ in the minimal supergravity model
• Measurement of the Electroweak Penguin Process B --> X(s) l+ l-
• A Systematic Analysis of the Exclusive B -> K^* l^+ l^- Decay
• Search for the Flavor-Changing Neutral Current Decays B^+ -> mu^+ mu^- K^+ and B^0 -> mu^+ mu^-K^{*0}
• Rare decays B -> (K, K*) (l+ l-, nu bar{nu}) in the quark model
• Exclusive B-meson Rare Decays and General Relations of Form Factors in Effective Field Theory of Heavy Quarks
• Improved Upper Limits on the FCNC Decays $B\to K{\ell }^{+}{\ell }^{-}$ and $B\to K^{\ast }(892){\ell }^{+}{\ell }^{-}$

Cited by in corpus (64)

• Measurement of the Differential Branching Fraction and Forward-Backword Asymmetry for B->K(*)l+l-
• Physics at Super B Factory
• Flavor Physics in the Quark Sector
• Exclusive radiative and electroweak b->d and b->s penguin decays at NLO
• Discovering New Light States at Neutrino Experiments
• Exclusive rare B -> K*e+e- decays at low recoil: controlling the long-distance effects
• Measurements of branching fractions, rate asymmetries, and angular distributions in the rare decays B --> Kl+l- and B --> K*l+l-
• Theory of B -> K(*)l+l- decays at high q^2: OPE and quark-hadron duality
• Improved Measurement of the Electroweak Penguin Process B->Xsll
• Measurement of the B -> Xs l+ l- branching fraction with a sum over exclusive modes
• b-physics signals of the lightest CP-odd Higgs in the NMSSM at large tan beta
• SM with four generations: Selected implications for rare B and K decays
• Difference in B^+ and B^0 Direct CP Asymmetry as Effect of a Fourth Generation
• Constraints on a very light CP-odd Higgs of the NMSSM and other axion-like particles
• Measurement of Forward-Backward Asymmetry and Wilson Coefficients in $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$
• Search for B -> h(*) nu nubar Decays at Belle
• K1(1270)-K1(1400) Mixing Angle and New-Physics Effects in B to K1 l+ l- Decays
• Analysis of rare (B -> K_0*(1430) l^+ l^- decay) within QCD sum rules
• Double-lepton polarization asymmetries in the (B -> K l^+ l^-) decay beyond the Standard Model
• Polarized lepton pair forward-backward asymmetries in (B -> K^* l^+ l^-) decay beyond the standard model
• Study of $B\to K_0^{\ast }(1430)\ell \bar{\ell }$ Decays
• Polarization effects in exclusive semileptonic (Lambda_b -> Lambda l^+ l^-) decay
• Searching for New Physics in b to s Hadronic Penguin Decays
• Search for the Rare Decays B^+ -> mu^+ mu^- K^+, B^0 -> mu^+ mu^- K^*0(892), and B^0_s -> mu^+ mu^- phi at CDF
• Search for $B\to \pi {\ell }^{+}{\ell }^{-}$ Decays at Belle
• Forward-backward asymmetries in (Lambda_b -> Lambda l^+ l^-) decay beyond the standard model
• Exclusive Semileptonic Rare Decays $B\to K^{(\ast )}{l}^{+}{l}^{-}$ in a SUSY SO(10) GUT
• Constraining new physics with B to K* mu+ mu- in the early LHC era
• Double-lepton polarization asymmetries in Lambda_b -> Lambda l^+ l^- decay
• Lepton polarization effects in "Lambda_b -> Lambda l+l-" decay in family non-universal Z' model
• Double-lepton polarization asymmetries in the Exclusive (B -> rho l^+ l^-) decay beyond the Standard Model
• Exclusive (B -> rho l^+ l^-) decay and Polarized lepton pair forward--backward asymmetries
• Large forward-backward asymmetry in B --> K mu+ mu- from new physics tensor operators
• New physics upper bound on the branching ratio of B_s --> l+ l-
• Search for the Rare Decay B0_s -> phi mu^+ mu- with the D0 Detector
• Model Independent Analysis of the Forward-Backward Asymmetry for the $B\to K_1{\mu }^{+}{\mu }^{-}$ Decay
• Probing extended Higgs sector through rare b --> s mu+ mu- transitions
• (B -> K_2 l^+ l^-) decay beyond the Standard Model
• Analysis of B_s->ϕ\ell^+ \ell^- decay with new physics effects
• Polarized forward-backward asymmetries of leptons in (B_s -> l^+ l^- gamma) decay
• Double-lepton polarizations in (B -> l^+ l^- gamma) decay
• B_s --> mu+ mu- decay in the R-parity violating minimal supergravity
• Low scale Seesaw model and Lepton Flavor Violating Rare B Decays
• Angular distribution of the FCNC process $B_c\to D_s^{\ast }(\to D_s\pi ){\ell }^{+}{\ell }^{-}$
• Imprints of CP violation asymmetries in rare ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decay in family non-universal $Z^{\prime }$ model
• Forward-backward Asymmetry and Branching Ratio of $B \rar K_1 \ell^+ \ell^-$ Transition in Supersymmetric Models
• The Semileptonic $B$ to $K_1(1270,1400)$ Decays in QCD Sum Rules
• Rare decays $B_s\to l^{+}{l}^{-}$ and $B\to K{l}^{+}{l}^{-}$ in \the topcolor-assisted technicolor model
• Custodial bulk Randall-Sundrum model and B->K* l+ l'-
• CP violation in the $B\to K{\ell }^{+}{\ell }^{-}$ decay
• B Physics on the Lattice: Present and Future
• Tensor form factors of $B\to K_1$ transition from QCD light cone sum rules
• Exploring New Physics in transition $b\to s{\ell }^{+}{\ell }^{-}$ through different $B_c\to D_s^{(\ast )}{\ell }^{+}{\ell }^{-}$ observables
• Tension between scalar/pseudoscalar new physics contribution to B_s --> mu+ mu- and B --> K mu+ mu-
• New physics upper bound on the branching ratio of B_s --> l+ l- gamma
• A comparative study on $B \rar K^\ast \ell^+ \ell^-$ and $B \rar K_0^\ast (1430) \ell^+ \ell^-$ decays in the Supersymmetric Models
• The phenomenology of rare and semileptonic B decays
• B \to 0^{+}(1^{+}) + missing energy in Unparticle Physics
• Lepton polarization and CP-violating effects in $\overline{B}\to {\overline{K}}_0^{\ast }(1430){\ell }^{+}{\ell }^{-}$ Decay in Standard and Two Higgs Doublet Model
• Polarized and Unpolarized Lepton Pair Forward-backward Asymmetries in $\overline{B}\to {\overline{K}}_0^{\ast }(1430){\ell }^{+}{\ell }^{-}$ and $\overline{B}\to \overline{K}{\ell }^{+}{\ell }^{-}$ Decays in Two Higgs Doublet Model
• Rare Bc->Ds l^+ l^- decay beyond the standard model
• Study of Form Factors and Observables in $B_c^{-}\to {\bar{D}}^{(\ast )0}{\ell }^{-}{\bar{\nu }}_{\ell }$ and $B_c^{-}\to D^{(\ast )-}{\ell }^{+}{\ell }^{-}$ decays
• New physics search in the LHCb era
• New physics upper bound on the branching ratio of B_s--> l+ l- and B_s--> l+ l- gamma