Effects of scalar leptoquark on semileptonic ${\Lambda }_b$ decays

Abstract

We study the scalar leptoquark effects on the rare semileptonic decays of ${\Lambda }_b$ baryon, governed by the quark level transition $b\to s{l}^{+}{l}^{-}$. We estimate the branching ratios, forward-backward asymmetries, lepton polarization parameters and the lepton flavour non-universality effects in these decay channels. We find significant deviations from the corresponding standard model predictions in some of the observables due to leptoquark effects. We also investigate the lepton flavour violating decays ${\Lambda }_b\to \Lambda l_i^{-}{l}_j^{+}$, the branching ratios of which are found to be $\mathcal{O}(10^{-10}-10^{-9})$.

arXiv comment30 pages, 9 figures, version to appear in New Journal of Physics

References in corpus (85)

• Weak Decays Beyond Leading Logarithms
• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Lepton-Flavor Violation via Right-Handed Neutrino Yukawa Couplings in Supersymmetric Standard Model
• Symmetries and Asymmetries of B -> K* mu+ mu- Decays in the Standard Model and Beyond
• Measurement of form-factor independent observables in the decay $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$
• Observation of the rare $B_s^0\to {\mu }^{+}{\mu }^{-}$ decay from the combined analysis of CMS and LHCb data
• B_{s,d} -> l+ l- in the Standard Model with Reduced Theoretical Uncertainty
• Effective Hamiltonian for $B \ra X_s e^+ e^-$ Beyond Leading Logarithms in the NDR and HV Schemes
• Angular analysis of the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay using $3\,\mbox{fb}^{-1}$ of integrated luminosity
• One Leptoquark to Rule Them All: A Minimal Explanation for $R_{D^{(\ast )}}$, $R_K$ and $(g-2{)}_{\mu }$
• A Comparative Study of the Decays $B\to (K,K^{\ast }){\ell }^{+}{\ell }^{-}$ in Standard Model and Supersymmetric Theories
• Explaining $h\to {\mu }^{\pm }{\tau }^{\mp }$, $B\to K^{\ast }{\mu }^{+}{\mu }^{-}$ and $B\to K{\mu }^{+}{\mu }^{-}/B\to K{e}^{+}{e}^{-}$ in a two-Higgs-doublet model with gauged $L_{\mu }-L_{\tau }$
• Violations of lepton flavour and CP in supersymmetric unified theories
• Understanding the B->K*mu+mu- Anomaly
• Dressing L_mu - L_tau in Color
• Model independent constraints on leptoquarks from rare processes
• Flavour-Violating Charged Lepton Decays in Seesaw-Type Models
• Differential branching fractions and isospin asymmetries of $B\to K^{(\ast )}{\mu }^{+}{\mu }^{-}$ decays
• Effective field theory approach to $b\to s\ell {\ell }^{(\prime )}$, $B\to K^{(\ast )}\nu \bar{\nu }$ and $B\to D^{(\ast )}\tau \nu$ with third generation couplings
• Global analysis of $b\to s\ell \ell$ anomalies
• Addressing the LHC flavour anomalies with horizontal gauge symmetries
• Vector leptoquark resolution of $R_K$ and $R_{D^{(\ast )}}$ puzzles
• $R_K$ and future $b\to s\ell \ell$ BSM opportunities
• Measurement of the $B_s^0\to {\mu }^{+}{\mu }^{-}$ branching fraction and search for $B^0\to {\mu }^{+}{\mu }^{-}$ decays at the LHCb experiment
• Implications of lepton flavor universality violations in B decays
• Implications from clean observables for the binned analysis of B -> K*ll at large recoil
• Current status of the Standard Model CKM fit and constraints on $\Delta F=2$ New Physics
• Lepton Polarization in the Decays $B\to X_s{\mu }^{+}{\mu }^{-}$ and $B\to X_s{\tau }^{+}{\tau }^{-}$
• $SU(2)\times U(1)$ gauge invariance and the shape of new physics in rare $B$ decays
• Non-abelian gauge extensions for B-decay anomalies
• On B -> V l l at small dilepton invariant mass, power corrections, and new physics
• A New Parametrization of the Seesaw Mechanism and Applications in Supersymmetric Models
• Anatomy and Phenomenology of mu-tau Lepton Flavour Violation in the MSSM
• On the impact of power corrections in the prediction of B->K*mu+mu- observables
• Lepton-flavour violating $B$ decays in generic $Z^{\prime }$ models
• Comprehensive Bayesian Analysis of Rare (Semi)leptonic and Radiative B Decays
• Testing Supersymmetry with Lepton Flavor Violating tau and mu decays
• Lepton Flavor Non-Universality in B-meson Decays from a U(2) Flavor Model
• Differential branching fraction and angular analysis of the decay $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$
• Analysis of $Λ_b \rar Λ\ell^+ \ell^-$ transition in SM4 using form factors from Full QCD
• ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ form factors, differential branching fraction, and angular observables from lattice QCD with relativistic $b$ quarks
• Predictions for Lepton Flavor Universality Violation in Rare B Decays in Models with Gauged $L_{\mu }-L_{\tau }$
• Scalar leptoquarks and the rare B meson decays
• Lepton flavor non-universality in $b\to s{\ell }^{+}{\ell }^{-}$ processes
• Form Factors for Lambda_b -> Lambda Transitions in SCET
• Flavour Changing Neutral Current Decays of Heavy Baryons: The Case ${\Lambda }_b\to \Lambda \gamma$
• Phenomenology of scalar leptoquarks
• Baryonic Rare Decays of ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$
• Logarithmically Enhanced Corrections to the Decay Rate and Forward Backward Asymmetry in anti-B --> X(s) l+ l-
• On the LHCb anomaly in B -> K* l+ l-
• Composite Leptoquarks at the LHC
• 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
• Leptoquarks, Dark Matter, and Anomalous LHC Events
• Rare Decays of Λ_b->Λ+ γand Λ_b ->Λ+ l^{+} l^{-} in the Light-cone Sum Rules
• Leptoquarks: Neutrino masses and accelerator phenomenology
• Two-Loop Neutrino Mass Generation through Leptoquarks
• Angular Analysis of the Decay ${\Lambda }_b\to \Lambda (\to N\pi ){\ell }^{+}{\ell }^{-}$
• Exclusive Rare Decays of Heavy Baryons to Light Baryons: $Λ_b \ri ghtarrow Λγ$ and ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$
• Limits on scalar leptoquark interactions and consequences for GUTs
• Minimal Flavour Violation for Leptoquarks
• Study of the rare semileptonic decays $B_d^0\to K^{\ast }{l}^{+}{l}^{-}$ in scalar leptoquark model
• Lepton Asymmetries in Heavy Baryon Decays of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$
• Can scalar leptoquarks explain the f_{D_s} puzzle?
• A common origin of $R_K$ and neutrino masses
• Lambda_b -> Lambda l+ l- form factors and differential branching fraction from lattice QCD
• Model independent constraints on leptoquarks from b -> s l+ l- processes
• Leptoquark induced rare decay amplitudes $h\to {\tau }^{\mp }{\mu }^{\pm }$ and $\tau \to \mu \gamma$
• Exclusive (Lambda_b -> Lambda l^+ l^-) decay beyond standard model
• Leptoquark explanation of $h\to \mu \tau$ and muon $(g-2)$
• Model independent analysis of 'Lambda' baryon polarizations in (Lambda_b -> Lambda l^+ l^-) decay
• Are the B decay anomalies related to neutrino oscillations?
• Leptoquarks in FCNC charm decays
• Study of FCNC mediated Z boson effect in the semileptonic rare baryonic decays ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$
• Constraining Scalar Leptoquarks from the K and B Sectors
• Using ${\Lambda }_b\to \Lambda {\mu }^{+}{\mu }^{-}$ data within a Bayesian analysis of $|\Delta B|=|\Delta S|=1$ decays
• Interpreting the CMS ${\ell }^{+}{\ell }^{-}jjE{/}_{\mathrm{T}}$ Excess with a Leptoquark Model
• Study of ${\Lambda }_b\to \Lambda \nu \bar{\nu }$ with Polarized Baryons
• New physics effects in (Lambda_b -> Lambda l^+ l^-) decay with lepton polarizations
• Lepton Flavour Violating tau Decays in the Left-Right Symmetric Model
• T violation in (Lambda_b -> Lambda l^+ l^-) decay beyond standard model
• Minimal Lepton Flavor Violation Implications of the $b\to s$ Anomalies
• Effect of scalar leptoquarks on the rare decays of B_s meson
• Forward-backward asymmetries in (Lambda_b -> Lambda l^+ l^-) decay beyond the standard model
• Effect of FCNC mediated Z boson on lepton flavor violating decays
• Fourth generation effect on ${\Lambda }_b$ decays

Cited by in corpus (17)

• Phenomenology of an $SU(2)\times SU(2)\times U(1)$ model with lepton-flavour non-universality
• Explaining the $R_K$ and $R_{D^{(\ast )}}$ anomalies with vector leptoquarks
• Neutrino mixing and $R_K$ anomaly in $U(1{)}_X$ models: a bottom-up approach
• Model independent New Physics analysis in ${\Lambda }_b\to \Lambda {\mu }^{+}{\mu }^{-}$ decay
• Rare semileptonic $B\to K(\pi )l_i^{-}{l}_j^{+}$ decay in vector leptoquark model
• Reconciling dark matter, $R_{K^{(\ast )}}$ anomalies and $(g-2{)}_{\mu }$ in an $L_{\mu }-L_{\tau }$ scenario
• Boosting vector leptoquark searches with boosted tops
• Dispersive bounds for local form factors in ${\Lambda }_b\to \Lambda$ transitions
• New Physics effects in charm meson decays involving $c\to u{l}^{+}{l}^{-}(l_i^{\mp }{l}_j^{\pm })$ transitions
• Light dark matter, rare $B$ decays with missing energy in $L_{\mu }-L_{\tau }$ model with a scalar leptoquark
• Implications of a Electroweak Triplet Scalar Leptoquark on the Ultra-High Energy Neutrino Events at IceCube
• Lepton flavour violation in rare ${\Lambda }_b$ decays
• Investigating the Production of Leptoquarks by Means of Zeros of Amplitude at Photon Electron Collider
• The ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\mu }^{+}{\mu }^{-}$ decay in the aligned two-Higgs-doublet model
• Analysis of Angular Observables of ${\Lambda }_b\to \Lambda (\to p\pi ){\mu }^{+}{\mu }^{-}$ Decay in Standard and $Z^{\prime }$ Models
• Angular distribution of ${\Lambda }_b^0\to p{K}^{-}{\ell }^{+}{\ell }^{-}$ decays comprising $\Lambda$ resonances with spin up to $\le 5/2$
• Reappraisal of the minimal flavoured $Z^{\prime }$ scenario