Rare baryon decays Lambda_b -> Lambda l+ l- (l=e, mu, tau) and Lambda_b -> Lambda gamma : Differential and total rates, lepton- and hadron-side forward-backward asymmetries

Abstract

Using the covariant constituent quark model previously developed by us we calculate the differential rate and the forward-backward asymmetries on the lepton and hadron side for the rare baryon decays Lambda_b -> Lambda l+ l- (l=e, mu, tau) and Lambda_b -> Lambda gamma. We use helicity methods to write down a three-fold joint angular decay distribution for the cascade decay Lambda_b -> Lambda (-> p pi-) + J_eff (-> l+ l-). Through appropriate angular integrations we obtain expressions for the rates, the lepton-side forward-backward (FB) asymmetry and the polarization of the daughter baryon Lambda leading to a hadron-side forward-backward asymmetry. We present numerical results on these observables using the covariant quark model and compare our results to the results of other calculations that have appeared in the literature.

36 pages, 26 figures

References in corpus (51)

• Weak Decays Beyond Leading Logarithms
• Heavy baryons
• Probing New Physics Via the Transverse Amplitudes of B0-> K*0(-> K- pi+) l+l- at Large Recoil
• Heavy Baryon Transitions in a Relativistic Three-Quark Model
• Magnetic moments of heavy baryons in the relativistic three-quark model
• Observation of the Baryonic Flavor-Changing Neutral Current Decay Lambda_b -> Lambda mu+ mu-
• Analysis of $Λ_b \rar Λ\ell^+ \ell^-$ transition in SM4 using form factors from Full QCD
• Use and Misuse of QCD Sum Rules in Heavy-to-light Transitions: the Decay $B\to \rho e\nu$ Reexamined
• Strong and Radiative Decays of Heavy Flavored Baryons
• 1/M Corrections to Baryonic Form Factors in the Quark Model
• Form Factors for Lambda_b -> Lambda Transitions in SCET
• Flavour Changing Neutral Current Decays of Heavy Baryons: The Case ${\Lambda }_b\to \Lambda \gamma$
• Baryonic Rare Decays of ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$
• Relativistic constituent quark model with infrared confinement
• Electromagnetic form factors of nucleons in a relativistic three-quark model
• Analysis of the $Λ_{b}\rar Λ\ell^+\ell^- $ decay in QCD
• Rare Decays of Λ_b->Λ+ γand Λ_b ->Λ+ l^{+} l^{-} in the Light-cone Sum Rules
• Effective Lagrangian Approach to Weak Radiative Decays of Heavy Hadrons
• Semileptonic decays of double heavy baryons in a relativistic constituent three-quark model
• Exclusive Rare Decays of Heavy Baryons to Light Baryons: $Λ_b \ri ghtarrow Λγ$ and ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$
• Probing for New Physics in Polarized ${\Lambda }_b$ decays at the Z
• Helicity Analysis of Semileptonic Hyperon Decays Including Lepton Mass Effects
• Quark model description of the tetraquark state X(3872) in a relativistic constituent quark model with infrared confinement
• Semileptonic decays of double heavy baryons
• Heavy-to-light baryonic form factors at large recoil
• The exclusive rare decays B -> K l(bar) l and B_c -> D(D*) l(bar) l in a relativistic quark model
• Radiative decays of double heavy baryons in a relativistic constituent three-quark model including hyperfine mixing
• Semileptonic decays of the light J(P)=1/2(+) ground state baryon octet
• Form factors for semileptonic, nonleptonic and rare $B(B_s)$ meson decays
• One-photon decay of the tetraquark state $X(3872)\to \gamma +J/\psi$ in a relativistic constituent quark model with infrared confinement
• Rare dileptonic decays of Λ_b in a quark model
• Lepton Asymmetries in Heavy Baryon Decays of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$
• PQCD Calculation for ${\Lambda }_b\to \Lambda \gamma$ in the Standard Model
• Factorization of Heavy-to-Light Baryonic Transitions in SCET
• One-Photon Transitions between Heavy Baryons in a Relativistic Three-Quark Model
• Exclusive semileptonic decays of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in supersymmetric theories
• Rare ${\Lambda }_b\to \Lambda$ l${}^{+}$ l${}^{-}$ Decays with Polarized $\Lambda$
• The FORM project
• Light baryons and their electromagnetic interactions in the covariant constituent quark model
• Rare decays of ${\Lambda }_b\to \Lambda \gamma$ and ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in universal extra dimension model
• FCNC $B_s$ and ${\Lambda }_b$ transitions: Standard Model versus a single Universal Extra Dimension scenario
• On the choice of heavy baryon currents in the relativistic three-quark model
• Polarization effects in exclusive semileptonic (Lambda_b -> Lambda l^+ l^-) decay
• Improved Light-cone QCD Sum Rule Analysis Of The Rare Decays ${\Lambda }_b\to \Lambda \gamma$ And ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$
• Weak Radiative Decay Lambda_b to Lambda gamma and Quark-Confined Effects in the Covariant Oscillator Quark Model
• Double Lepton Polarization in ${\Lambda }_b-->\Lambda l^{+}{l}^{-}$ Decay in the Standard Model with Fourth Generations Scenario
• Lambda_b and Lambda_c baryon decays at finite values of heavy quark masses
• Investigation of the ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ transition in universal extra dimension using form factors from full QCD
• Lambda_b -> Lambda l+ l- decay within family non-universal Z' model
• A relativistic quark model with infrared confinement and the tetraquark state
• Measurement of the branching ratio of the decay ${\Xi }^0\to {\Sigma }^{+}{\mu }^{-}{\bar{\nu }}_{\mu }$

Cited by in corpus (69)

• Understanding the B->K*mu+mu- Anomaly
• ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ form factors, differential branching fraction, and angular observables from lattice QCD with relativistic $b$ quarks
• The semileptonic decay Lambda_b -> Lambda_c + tau(-) + antinu_tau in the covariant confined quark model
• Generalised helicity formalism, higher moments and the $B\to K_{J_K}(\to K\pi ){\bar{\ell }}_1{\ell }_2$ angular distributions
• Strong decays of molecular states Zc(+) and Zc'(+)
• ${\Lambda }_c\to N$ form factors from lattice QCD and phenomenology of ${\Lambda }_c\to n{\ell }^{+}{\nu }_{\ell }$ and ${\Lambda }_c\to p{\mu }^{+}{\mu }^{-}$ decays
• Angular moments of the decay ${\Lambda }_b^0\to \Lambda {\mu }^{+}{\mu }^{-}$ at low hadronic recoil
• Semileptonic $D_{(s)}$-meson decays in the light of recent data
• Nonleptonic two-body decays of single heavy baryons ${\Lambda }_Q$, ${\Xi }_Q$, and ${\Omega }_Q$ $(Q=b,c)$ induced by $W$ emission in the covariant confined quark model
• Polarization effects in the cascade decay Lambda_b -> Lambda(-> p pi-) + J/psi(-> l+ l-) in the covariant confined quark model
• Heavy-to-light semileptonic decays of Lambda_b and Lambda_c baryons in the covariant confined quark model
• Measurement of the differential branching fraction of the decay ${\Lambda }_b^0\to \Lambda {\mu }^{+}{\mu }^{-}$
• Selected strong decays of $\eta (2225)$ and $\varphi (2170)$ as $\Lambda \bar{\Lambda }$ bound states
• Semileptonic decays ${\Lambda }_c^{+}\to \Lambda {\ell }^{+}{\nu }_{\ell }(\ell =e,\mu )$ in the covariant quark model and comparison with the new absolute branching fraction measurements of Belle and BESIII
• Investigation of Effects of New Physics in ${\Lambda }_b\to {\Lambda }_c\tau {\bar{\nu }}_{\tau }$ Decay
• Selected strong decay modes of Y(4260)
• Model independent New Physics analysis in ${\Lambda }_b\to \Lambda {\mu }^{+}{\mu }^{-}$ decay
• First observation of the radiative decay ${\Lambda }_b^0\to \Lambda \gamma$
• Effects of scalar leptoquark on semileptonic ${\Lambda }_b$ decays
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• On the meson mass spectrum in the covariant confined quark model
• Radiative decay Y(4260) -> X(3872) + gamma involving hadronic molecular and charmonium components
• Endpoint Relations for Baryons
• On the angular distribution of ${\Lambda }_b\to \Lambda (\to N\pi ){\tau }^{+}{\tau }^{-}$ decay
• Rare ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ and ${\Lambda }_b\to \Lambda \gamma$ decays in the relativistic quark model
• Form factors of the B-S-transitions in the covariant quark model
• Study of $B_s\to {\ell }^{+}{\ell }^{-}\gamma$ decays in covariant quark model
• Angular analysis of the rare decay ${\Lambda }_b\to \Lambda (1520)(\to NK){\ell }^{+}{\ell }^{-}$
• The time-dependent angular analysis of $B_d\to K_S\ell \ell$, a new benchmark for new physics
• Lepton mass effects and angular observables in ${\Lambda }_b\to \Lambda (\to p\pi ){\ell }^{+}{\ell }^{-}$
• The ${\Lambda }_b\to {\Lambda }^{\ast }(1520)(\to N\bar{K}){\ell }^{+}{\ell }^{-}$ decay at low-recoil in HQET
• Weak production of strange and charm ground-state baryons in nuclei
• Weak Radiative Decays of Anti-triplet Bottomed Baryons in Light-Front Quark Model
• Time-reversal asymmetries and angular distributions in ${\Lambda }_b\to \Lambda V$
• Seeking massless dark photons in the decays of charmed hadrons
• Towards an assessment of the ATLAS data on the branching ratio Gamma(Lambda_b(0) -> psi(2S) Lambda(0))/Gamma(Lambda_b(0) -> J/psi Lambda(0))
• Decay $B\to K^{\ast }(\to K\pi ){\ell }^{+}{\ell }^{-}$ in covariant quark model
• Rare ${\Lambda }_b\to n{l}^{+}{l}^{-}$ decays in the relativistic quark-diquark picture
• Radiative decays $D^*_{(s)}\to D_{(s)}γ$ in covariant confined quark model
• Pinning down $|\Delta c|=|\Delta u|=1$ couplings with rare charm baryon decays
• Isospin-violating strong decays of scalar single-heavy tetraquarks
• Prospects for New Physics searches with ${\Lambda }_b\to \Lambda (1520){\ell }^{+}{\ell }^{-}$ decays
• Radiative $b$-baryon decays to measure the photon and $b$-baryon polarization
• Nucleon tensor form factors in a relativistic confined quark model
• Comparative analysis of the ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decay in the SM, SUSY and RS model with custodial protection
• Transition form factors and angular distributions of the ${\mathbf{\Lambda }}_{\mathbf{b}}\to \mathbf{\Lambda }(1520)(\to \mathbf{N}\bar{\mathbf{K}}){\mathbf{\ell }}^{+}{\mathbf{\ell }}^{-}$ decay supported by baryon spectroscopy
• FCNC transitions of ${\Lambda }_b$ to neutron in Bethe-Salpeter equation approach
• Analysis of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ rare decays in a non-universal $Z^{\prime }$ model
• Rare ${\Lambda }_c$ decays and new physics effects
• Rare ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ decay in the Bethe-Salpeter equation approach
• Study of the nonleptonic decay ${\Xi }_c^0\to {\Lambda }_c^{+}{\pi }^{-}$ in the covariant confined quark model
• A detailed study of the ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decays in the Standard Model
• Searching $B_c^{\ast }$ via conservation laws
• A new angle on an old problem: Helicity approach to neutron beta decay in the Standard Model
• Physical observables in the decay ${\Lambda }_b\to {\Lambda }_c(\to \Lambda +\pi )+{\tau }^{-}+{\bar{\nu }}_{\tau }$
• Analysis of Angular Observables of ${\Lambda }_b\to \Lambda (\to p\pi ){\mu }^{+}{\mu }^{-}$ Decay in Standard and $Z^{\prime }$ Models
• Searching for New Physics in Semi-Leptonic Baryon Decays
• Semileptonic baryon decays ${\Xi }_b\to {\Xi }_c{\ell }^{-}{\bar{\nu }}_{\ell }$ in perturbative QCD
• Analysis of the nonleptonic two-body decays of the $\Lambda$ hyperon
• Polarized ${\Lambda }_b$ baryon decay to $p\pi$ and a dilepton pair
• Probing the ATOMKI X17 vector boson using Dalitz decays $V\to P{e}^{+}{e}^{-}$
• ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ as probe of CP-violating New Physics
• New opportunities for rare charm from $Z\to c\bar{c}$ decays
• ${\Xi }_b\to \Xi$ form factors from lattice QCD and Standard-Model predictions for ${\Xi }_b\to \Xi {\mu }^{+}{\mu }^{-}$ and ${\Xi }_b\to \Xi \gamma$ decays
• Probing new physics effects in ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ decay via model independent approach
• Forward-backward asymmetries in ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ in Bethe-Salpeter equation approach
• Baryons and baryoniums in the perspective of QCD sum rules
• Semileptonic neutral current decays of ${\Xi }_b$ with dileptons or dineutrinos in the final state
• Radiative transitions of charmonium states in the covariant confined quark model