${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ as probe of CP-violating New Physics

Abstract

We investigate the possible sizes of all the CP-violating asymmetries offered by the angular distribution of rare decay ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\ell }^{+}{\ell }^{-}$ in the Standard Model and new physics scenarios motivated by the recent $b\to s{\ell }^{+}{\ell }^{-}$ anomalies. We work in a model-independent effective theory framework and discuss the sensitivity of CP asymmetries to new $O_{9,10}$ operators and their chirality flipped counterparts. We find that the size of many of the CP asymmetries can be at the level of a few percent in new physics scenarios consistent with current $b\to s{\ell }^{+}{\ell }^{-}$ data at a level of $1\sigma$. We emphasize that measurements of these CP asymmetries can be used to discriminate different new physics scenarios in $b\to s{\ell }^{+}{\ell }^{-}$.

28 pages, 4 captioned figures; updated NP benchmarks following the latest RK(*) measurements; matches journal version

References in corpus (71)

• Weak Decays Beyond Leading Logarithms
• CP Violation and the CKM Matrix: Assessing the Impact of the Asymmetric B Factories
• Test of lepton universality using $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Test of lepton universality with $B^0\to K^{\ast 0}{\ell }^{+}{\ell }^{-}$ decays
• Measurement of the permanent electric dipole moment of the neutron
• Symmetries and Asymmetries of B -> K* mu+ mu- Decays in the Standard Model and Beyond
• Measurement of form-factor independent observables in the decay $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$
• Systematic approach to exclusive B ->V l^+l^-, V gamma decays
• Weak Radiative B-Meson Decay Beyond Leading Logarithms
• Angular analysis of the $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ decay using $3\,\mbox{fb}^{-1}$ of integrated luminosity
• More Model-Independent Analysis of b->s Processes
• Understanding the B->K*mu+mu- Anomaly
• Search for lepton-universality violation in $B^{+}\to K^{+}{\ell }^{+}{\ell }^{-}$ decays
• Test of lepton universality in beauty-quark decays
• Differential branching fractions and isospin asymmetries of $B\to K^{(\ast )}{\mu }^{+}{\mu }^{-}$ decays
• Global analysis of $b\to s\ell \ell$ anomalies
• Patterns of New Physics in $b\to s{\ell }^{+}{\ell }^{-}$ transitions in the light of recent data
• Angular Distributions of B -> K ll Decays
• Flavour anomalies after the $R_{K^{\ast }}$ measurement
• Angular analysis and differential branching fraction of the decay $B_s^0\to \varphi {\mu }^{+}{\mu }^{-}$
• 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
• $SU(2)\times U(1)$ gauge invariance and the shape of new physics in rare $B$ decays
• Emerging patterns of New Physics with and without Lepton Flavour Universal contributions
• Comprehensive Bayesian Analysis of Rare (Semi)leptonic and Radiative B Decays
• CP Asymmetries in bar B -> bar K* (-> bar K pi) l+ l- and Untagged bar B_s,B_s -> phi (-> K+ K-) l+ l- Decays at NLO
• Calculation of two-loop virtual corrections to b --> s l+ l- in the standard model
• Observation of the Baryonic Flavor-Changing Neutral Current Decay Lambda_b -> Lambda mu+ mu-
• ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ form factors, differential branching fraction, and angular observables from lattice QCD with relativistic $b$ quarks
• Continuing search for new physics in $b\to s\mu \mu$ decays: two operators at a time
• Constraints on Lepton Universality Violation from Rare $B$ Decays
• Global fits to b -> s ll data and signs for lepton non-universality
• Rare $b$ decays meet high-mass Drell-Yan
• On the LHCb anomaly in B -> K* l+ l-
• Implications of new evidence for lepton-universality violation in $b\to s{\ell }^{+}{\ell }^{-}$ decays
• 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
• Angular Distribution and CP Asymmetries in the Decays B->K^-pi^+e^-e^+ and B->pi^-pi^+e^-e^+
• Rare Decays of Λ_b->Λ+ γand Λ_b ->Λ+ l^{+} l^{-} in the Light-cone Sum Rules
• Analysis of the $Λ_{b}\rar Λ\ell^+\ell^- $ decay in QCD
• $b\to s\ell \ell$ Global Fits after $R_{K_S}$ and $R_{K^{\ast +}}$
• Precise Measurements of Decay Parameters and $CP$ Asymmetry with Entangled $\Lambda -\bar{\Lambda }$ Pairs
• Angular Analysis of the Decay ${\Lambda }_b\to \Lambda (\to N\pi ){\ell }^{+}{\ell }^{-}$
• Analytic calculation of two-loop QCD corrections to b\to s\ell^+\ell^- in the high q^2 region
• Exclusive Rare Decays of Heavy Baryons to Light Baryons: $Λ_b \ri ghtarrow Λγ$ and ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$
• Implications for New Physics in $b\to s\mu \mu$ transitions after recent measurements by Belle and LHCb
• New Physics in $b\to s{\mu }^{+}{\mu }^{-}$: Distinguishing Models through CP-Violating Effects
• New Physics in b -> s mu+ mu-: CP-Violating Observables
• Angular moments of the decay ${\Lambda }_b^0\to \Lambda {\mu }^{+}{\mu }^{-}$ at low hadronic recoil
• Rare dileptonic decays of Λ_b in a quark model
• Lepton Asymmetries in Heavy Baryon Decays of ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$
• Rare ${\Lambda }_b\to \Lambda$ l${}^{+}$ l${}^{-}$ Decays with Polarized $\Lambda$
• Model independent analysis of 'Lambda' baryon polarizations in (Lambda_b -> Lambda l^+ l^-) decay
• Model independent New Physics analysis in ${\Lambda }_b\to \Lambda {\mu }^{+}{\mu }^{-}$ decay
• Angular distribution of polarised ${\Lambda }_b$ baryons decaying to $\Lambda {\ell }^{+}{\ell }^{-}$
• Measurement of $CP$ asymmetries in the decays $B^0\to K^{\ast 0}{\mu }^{+}{\mu }^{-}$ and $B^{+}\to K^{+}{\mu }^{+}{\mu }^{-}$
• Bayesian analysis of $b\to s{\mu }^{+}{\mu }^{-}$ Wilson coefficients using the full angular distribution of ${\Lambda }_b\to \Lambda (\to p{\pi }^{-}){\mu }^{+}{\mu }^{-}$ decays
• Using ${\Lambda }_b\to \Lambda {\mu }^{+}{\mu }^{-}$ data within a Bayesian analysis of $|\Delta B|=|\Delta S|=1$ decays
• New physics effects in (Lambda_b -> Lambda l^+ l^-) decay with lepton polarizations
• T violation in (Lambda_b -> Lambda l^+ l^-) decay beyond standard model
• Polarization effects in exclusive semileptonic (Lambda_b -> Lambda l^+ l^-) decay
• Constraints on tensor and scalar couplings from $B\to K\bar{\mu }\mu$ and $B_s\to \bar{\mu }\mu$
• Rare ${\Lambda }_b\to \Lambda l^{+}{l}^{-}$ and ${\Lambda }_b\to \Lambda \gamma$ decays in the relativistic quark model
• On the angular distribution of ${\Lambda }_b\to \Lambda (\to N\pi ){\tau }^{+}{\tau }^{-}$ decay
• Forward-backward asymmetries in (Lambda_b -> Lambda l^+ l^-) decay beyond the standard model
• Lepton mass effects and angular observables in ${\Lambda }_b\to \Lambda (\to p\pi ){\ell }^{+}{\ell }^{-}$
• Enhanced CP asymmetries in $B\to K{\mu }^{+}{\mu }^{-}$
• Double-lepton polarization asymmetries in Lambda_b -> Lambda l^+ l^- decay
• $CP$ violation in $b\to s\ell \ell$: a model independent analysis
• Lepton flavour violation in rare ${\Lambda }_b$ decays
• A detailed study of the ${\Lambda }_b\to \Lambda {\ell }^{+}{\ell }^{-}$ decays in the Standard Model
• Polarized ${\Lambda }_b$ baryon decay to $p\pi$ and a dilepton pair