Study of $\itΛ_{\it{b}}^\rm{0}$ and $\itΞ_{\it{b}}^\rm{0}$ decays to $\Lambda h^{+}{h}^{{}^{\prime }-}$ and evidence for $CP$ violation in $\itΛ_{\it{b}}^\rm{0}\to\itΛ K^+K^-$ decays

Abstract

A study of $\itΛ_{\it{b}}^\rm{0}$ and $\itΞ_{\it{b}}^\rm{0}$ decays to $\Lambda h^{+}{h}^{\prime -}$ $(h^{(\prime )}=\pi ,K)$ is performed using $pp$ collision data collected by the LHCb experiment during LHC Runs 1$-$2, corresponding to an integrated luminosity of $9{\mathrm{fb}}^{-1}$. The branching fractions for these decays are measured using the $\itΛ_{\it{b}}^\rm{0}\to\itΛ_{\it{c}}^+(\to\itΛπ^+)π^-$ decay as control channel. The decays $\itΛ_{\it{b}}^\rm{0}\to\itΛπ^+π^-$ and $\itΞ_{\it{b}}^\rm{0}\to\itΛK^-π^+$ are observed for the first time. For decay modes with sufficient signal yields, $CP$ asymmetries are measured in the full and localized regions of the final-state phase space. Evidence is found for $CP$ violation in the $\itΛ_{\it{b}}^\rm{0}\to\itΛK^+K^-$ decay, interpreted as originating primarily from an asymmetric $\itΛ_{\it{b}}^\rm{0} \to \it{N}^{*+} \it{K}^-$ decay amplitude. The measured $CP$ asymmetries for the other decays are compatible with zero.

All figures and tables, along with any supplementary material and additional information, are available at https://lbfence.cern.ch/alcm/public/analysis/full-details/1624/ (LHCb public pages)

References in corpus (18)

• PYTHIA 6.4 Physics and Manual
• Averages of $b$-hadron, $c$-hadron, and $\tau$-lepton properties as of 2021
• Measurements of $CP$ violation in the three-body phase space of charmless $B^{\pm }$ decays
• Measurement of $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decays
• Precise Measurements of Decay Parameters and $CP$ Asymmetry with Entangled $\Lambda -\bar{\Lambda }$ Pairs
• Study of the kinematic dependences of ${\Lambda }_b^0$ production in $pp$ collisions and a measurement of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{\pi }^{-}$ branching fraction
• Observation of the ${\Lambda }_b^0\to J/\psi p{\pi }^{-}$ decay
• Measurement of the mass and production rate of ${\Xi }_b^{-}$ baryons
• Search for $CP$ violation in ${\Xi }_c^{+}\to p{K}^{-}{\pi }^{+}$ decays using model-independent techniques
• Direct $CP$ violation in charmless three-body decays of $B^{\pm }$ mesons
• Search for $CP$ violation in ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ decays
• Observation of a ${\Lambda }_b^0-{\overline{\Lambda }}_b^0$ production asymmetry in proton-proton collisions at $\sqrt{s}=7\text{ and }8\text{TeV}$
• Measurement of the photon polarization in ${\Lambda }_b\to \Lambda \gamma$ decays
• CP Violation of Baryon Decays with $N\pi$ Scatterings
• Estimates of exchange topological contributions and $CP$-violating observables in ${\Lambda }_b\to \Lambda \varphi$ decay
• Observation of the suppressed ${\Lambda }_b^0\to Dp{K}^{-}$ decay with $D\to K^{+}{\pi }^{-}$ and measurement of its $CP$ asymmetry
• Search for the rare hadronic decay $B_s^0\to p\bar{p}$
• Search for prompt production of pentaquarks in charm hadron final states

Cited by in corpus (9)

• Measurement of $CP$ asymmetries in ${\Lambda }_b^0\to p{h}^{-}$ decays
• Stringent test of $CP$ symmetry in ${\Sigma }^{+}$ hyperon decays
• Remarks on strong phase shifts in weak nonleptonic baryon decays
• Implications of recent LHCb data on CPV in b-baryon four body decays
• Topological amplitudes of bottom baryon decays in the $SU(3{)}_F$ limit
• First evidence of $CP$ violation in beauty baryon to charmonium decays
• $CP$-violation and $U$-spin symmetry in four-body bottom baryon decays
• Partial Wave Analysis of $e^{+}{e}^{-}\to {\pi }^{+}{\pi }^{-}J/\psi$ and Cross Section Measurement of $e^{+}{e}^{-}\to {\pi }^{\pm }{Z}_c(3900{)}^{\mp }$ from 4.1271 to 4.3583 GeV
• Amplitude analysis of the ${\Xi }_c^{+}\to p{K}^{-}{\pi }^{+}$ decay and ${\Xi }_c^{+}$ baryon polarization measurement in semileptonic beauty-hadron decays