The Benefits of B ---> K* l+ l- Decays at Low Recoil

Abstract

Using the heavy quark effective theory framework put forward by Grinstein and Pirjol we work out predictions for B -> K* l+ l-, l = (e, mu), decays for a softly recoiling K*, i.e., for large dilepton masses sqrt{q^2} of the order of the b-quark mass m_b. We work to lowest order in Lambda/Q, where Q = (m_b, sqrt{q^2}) and include the next-to-leading order corrections from the charm quark mass m_c and the strong coupling at O(m_c^2/Q^2, alpha_s). The leading Lambda/m_b corrections are parametrically suppressed. The improved Isgur-Wise form factor relations correlate the B -> K* l+ l- transversity amplitudes, which simplifies the description of the various decay observables and provides opportunities for the extraction of the electroweak short distance couplings. We propose new angular observables which have very small hadronic uncertainties. We exploit existing data on B -> K* l+ l- distributions and show that the low recoil region provides powerful additional information to the large recoil one. We find disjoint best-fit solutions, which include the Standard Model, but also beyond-the-Standard Model ones. This ambiguity can be accessed with future precision measurements.

31 pages, 8 figures; Instability near minimal recoil from numerics removed, Fig. 1 replaced and minor shifts in short distance uncertainties in SM predictions; typos corrected and references added; main results and conclusions unchanged

References in corpus (5)

• Estimate of BR(B -> X_s gamma) at O(alpha_s^2)
• Measurement of the Differential Branching Fraction and Forward-Backword Asymmetry for B->K(*)l+l-
• Angular Distributions of B -> K ll Decays
• New observables in the decay mode anti-B --> anti-K*0 l+ l-
• An estimate of the B-->K*gamma form factor

Cited by in corpus (120)

• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Angular analysis of the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay using $3\,\mbox{fb}^{-1}$ of integrated luminosity
• Understanding the B->K*mu+mu- Anomaly
• Global analysis of $b\to s\ell \ell$ anomalies
• Optimizing the basis of B->K*ll observables in the full kinematic range
• Measurement of $CP$-averaged observables in the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay
• New physics in $b\to s$ transitions after LHC run 1
• Implications of LHCb measurements and future prospects
• Implications from clean observables for the binned analysis of B -> K*ll at large recoil
• Lattice QCD calculation of form factors describing the rare decays $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ and $B_s\to \varphi {\ell }^{+}{\ell }^{-}$
• On B -> V l l at small dilepton invariant mass, power corrections, and new physics
• On the impact of power corrections in the prediction of B->K*mu+mu- observables
• 50 Years of Quantum Chromodynamics
• Review of Lepton Universality tests in B decays
• Measurement of Branching Fractions and Rate Asymmetries in the Rare Decays B -> K(*) l+ l-
• $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ decays at large recoil in the Standard Model: a theoretical reappraisal
• Comprehensive Bayesian Analysis of Rare (Semi)leptonic and Radiative B Decays
• Complete Anatomy of B -> K*ll and its angular distribution
• $B\to K{\ell }^{+}{\ell }^{-}$ decay at large hadronic recoil
• Theory of B -> K(*)l+l- decays at high q^2: OPE and quark-hadron duality
• Reassessing the discovery potential of the $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ decays in the large-recoil region: SM challenges and BSM opportunities
• Measurements of the Angular Distributions in the Decays B -> K(*) mu+ mu- at CDF
• Measurement of angular parameters from the decay ${\mathrm{B}}^0\to {\mathrm{K}}^{\ast 0}{\mu }^{+}{\mu }^{-}$ in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• Angular analysis of the decay B0 to K*0 mu mu from pp collisions at sqrt(s) = 8 TeV
• More Benefits of Semileptonic Rare B Decays at Low Recoil: CP Violation
• Calculation of $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ and $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$ observables using form factors from lattice QCD
• Rare $B$ Decays as Tests of the Standard Model
• $B\to K{l}^{+}{l}^{-}$ decay form factors from three-flavor lattice QCD
• General Analysis of B -> K^(*) l^+ l^- Decays at Low Recoil
• Towards the Identification of New Physics through Quark Flavour Violating Processes
• Patterns of Flavour Violation in Models with Vector-Like Quarks
• The Decay B --> K l^+ l^- at Low Hadronic Recoil and Model-Independent Delta B = 1 Constraints
• Model-independent constraints on new physics in b --> s transitions
• On transverse asymmetries in B --> K* l+l-
• On the Importance of Electroweak Corrections for B Anomalies
• On the LHCb anomaly in B -> K* l+ l-
• Cornering New Physics in b --> s Transitions
• Phenomenology of semileptonic B-meson decays with form factors from lattice QCD
• $b\to s\ell \ell$ Global Fits after $R_{K_S}$ and $R_{K^{\ast +}}$
• Angular Analysis of the Decay ${\Lambda }_b\to \Lambda (\to N\pi ){\ell }^{+}{\ell }^{-}$
• New Physics in b -> s mu+ mu-: CP-Conserving Observables
• Isospin asymmetries in $B\to (K^{\ast },\rho )\gamma /l^{+}{l}^{-}$ and $B\to K{l}^{+}{l}^{-}$ in and beyond the Standard Model
• Exploring New Physics in the C7-C7' plane
• Angular analysis and branching fraction measurement of the decay B0 to K*0 mu+ mu-
• Standard Model predictions for $B\to K{\ell }^{+}{\ell }^{-}$, $B\to K{\ell }_1^{-}{\ell }_2^{+}$ and $B\to K\nu \bar{\nu }$ using form factors from $N_f=2+1+1$ lattice QCD
• First measurement of the differential branching fraction and $CP$ asymmetry of the $B^{\pm }\to {\pi }^{\pm }{\mu }^{+}{\mu }^{-}$ decay
• Impact of $B\to K_0^{\ast }{\ell }^{+}{\ell }^{-}$ on the New Physics search in $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ decay
• Form factors for semileptonic, nonleptonic and rare $B(B_s)$ meson decays
• EOS -- A Software for Flavor Physics Phenomenology
• B -> K^* Form Factors from Flavor Data to QCD and Back
• Study of the rare semileptonic decays $B_d^0\to K^{\ast }{l}^{+}{l}^{-}$ in scalar leptoquark model
• Disentangling the Decay Observables in $B^{-}\to {\pi }^{+}{\pi }^{-}{\ell }^{-}{\bar{\nu }}_{\ell }$
• Probing anomalous tWb interactions with rare B decays
• Bayesian Fit of Exclusive $b\to s\bar{\ell }\ell$ Decays: The Standard Model Operator Basis
• Supersymmetric constraints from Bs -> mu+mu- and B -> K* mu+mu- observables
• $B\to \pi \ell \ell$ form factors for new-physics searches from lattice QCD
• On the S-wave pollution of B-> K* l+l- observables
• Flavor Anomalies in Heavy Quark Decays
• (A)symmetries of weak decays at and near the kinematic endpoint
• The birds and the Bs in RS: the b to s gamma penguin in a warped extra dimension
• The effect of S-wave interference on the $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ angular observables
• New-physics signals of a model with a vector-singlet up-type quark
• Time dependence in $B\to V\ell \ell$ decays
• Branching ratios, forward-backward asymmetries and angular distributions of $B\to K_2^{\ast }{l}^{+}{l}^{-}$ in the standard model and new physics scenarios
• Lepton polarization asymmetries in rare semi-tauonic $b\to s$ exclusive decays at FCC-$ee$
• The Minimal Flavour Violation benchmark in view of the latest LHCb data
• Extracting Angular Observables without a Likelihood and Applications to Rare Decays
• Using ${\Lambda }_b\to \Lambda {\mu }^{+}{\mu }^{-}$ data within a Bayesian analysis of $|\Delta B|=|\Delta S|=1$ decays
• Neutral Gauge Boson Contributions to the Dimuon Charge Asymmetry in B Decays
• A nonunitary interpretation for a single vector leptoquark combined explanation to the $B$-decay anomalies
• New Physics in Gamma_12^s: (sbar b) (taubar tau) Operators
• Model-independent analysis of $b\to d$ processes
• QCD Factorization for $B\to \pi \pi \ell \nu$ Decays at Large Dipion Masses
• Extracting $B\to K^{\ast }$ Form Factors from Data
• Z-mediated charge and CP asymmetries and FCNCs in $B_{d,s}$ processes
• New Physics Effects and Hadronic Form Factor Uncertainties in B -> K^* l^+ l^-
• Rare b hadron decays at the LHC
• Angular analysis of the decay B${}^{+}$ $\to$ K${}^{\ast }$(892)${}^{+}{\mu }^{+}{\mu }^{-}$ in proton-proton collisions at $\sqrt{s}=$ 8 TeV
• Leptoquark effects on $b\to s\nu \bar{\nu }$ and $B\to K{l}^{+}{l}^{-}$ decay processes
• Squark Flavor Implications from B --> K(*) l+ l-
• Lepton mass effects and angular observables in ${\Lambda }_b\to \Lambda (\to p\pi ){\ell }^{+}{\ell }^{-}$
• Direct determination of Wilson coefficients using $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decays
• The ${\Lambda }_b\to {\Lambda }^{\ast }(1520)(\to N\bar{K}){\ell }^{+}{\ell }^{-}$ decay at low-recoil in HQET
• Zooming in on $B\to K^{\ast }\ell \ell$ decays at low recoil
• Assessing lepton-flavour non-universality from $B\to K^{\ast }\ell \ell$ angular analyses
• $B\to K^{\ast }$ Transition Form Factors and the Semi-leptonic Decay $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$
• Light dark matter, rare $B$ decays with missing energy in $L_{\mu }-L_{\tau }$ model with a scalar leptoquark
• New physics search with flavour in the LHC era
• Studying ${\mathcal{B}}_1({\frac{1}{2}}^{+})\to {\mathcal{B}}_2({\frac{1}{2}}^{+}){\ell }^{+}{\ell }^{-}$ Semi-leptonic Weak Baryon Decays with the SU(3) Flavor Symmetry
• Determination of short- and long-distance contributions in $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decays
• An improved observable for the forward-backward asymmetry in B -> K* l+ l- and Bs -> phi l+ l-
• Decay $B\to K^{\ast }(\to K\pi ){\ell }^{+}{\ell }^{-}$ in covariant quark model
• Constraints on anomalous $tcZ$ coupling from $\bar{B}\to {\bar{K}}^{\ast }{\mu }^{+}{\mu }^{-}$ and $B_s\to {\mu }^{+}{\mu }^{-}$ decays
• Theoretical status of $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$: The path towards New Physics
• Method for an unbinned measurement of the $q^2$ dependent decay amplitudes of ${\bar{B}}^0\to {\bar{K}}^{\ast 0}{\mu }^{+}{\mu }^{-}$ decays
• Progress on semi-leptonic $B_{(s)}$ decays
• Constraints on a New Light Spin-One Particle from Rare b -> s Transitions
• Status of rare exclusive $B$ meson decays in 2018
• Angular analysis of B --> V (--> P_1 P_2) l^+ l^- decays
• The fate of $V_1$ vector leptoquarks: the impact of future flavour data
• Implications from $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ observables using $3{\text{fb}}^{-1}$ of LHCb data
• Contribution of vector resonances to the {\bar B}_d^0 -> {\bar K}^{*0} mu^+ mu^- decay
• Theoretical status of the CKM Matrix
• Signal of right-handed currents using $B\to K^{\ast }{\ell }^{+}{\ell }^{-}$ observables at the kinematic endpoint
• B ->K*ll: The New Frontier of New Physics searches in Flavor
• Investigating New Physics through the Observables of Semileptonic $B_s\to K^{\ast }(\to K\pi ){\mu }^{+}{\mu }^{-}$ Decay
• Challenges for New Physics in the Flavour Sector
• Lattice Calculations of B to K/K*l+l- form factors
• Short-Range Hard-Sphere Potential and Coulomb Interaction: Deser-Trueman Formula for Rydberg States of Exotic Atomic Systems
• Polarized ${\Lambda }_b$ baryon decay to $p\pi$ and a dilepton pair
• Precision Tests in $b\to s{\ell }^{+}{\ell }^{-}$ ($\ell =e,\mu$) at FCC-ee
• Probing new physics effects in ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ decay via model independent approach
• Rare beauty and charm decays at LHCb
• Heavy Flavor Physics at ATLAS and CMS
• $B\to K^{\ast }\ell \ell$ Standard Model contributions -- Zooming in on high $q^2$
• B -> K(*) l+ l- @ Low Recoil and Physics Implications
• Phenomenology of the exclusive rare semileptonic decay B -> K pi l^+ l^-
• Associated Production of Different Flavor Heavy Quarks Through $W^{\prime }$ Bosons at the LHC
• Investigating non-local contributions in $B_s\to \varphi \bar{\ell }\ell$ including higher-twist effects
• The Beauty of Lattice Perturbation Theory: The Role of Lattice Perturbation Theory in B Physics