Search for $CP$ violation in ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ decays

Abstract

A search for $CP$ violation in charmless three-body ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ decays is performed using $pp$ collision data recorded with the LHCb detector, corresponding to integrated luminosities of $1{\text{fb}}^{-1}$ at a centre-of-mass energy $\sqrt{s}=7\text{TeV}$, $2{\text{fb}}^{-1}$ at $\sqrt{s}=8\text{TeV}$ and $2{\text{fb}}^{-1}$ at $\sqrt{s}=13\text{TeV}$. A good description of the phase-space distribution is obtained with an amplitude model containing contributions from $\Sigma (1385)$, $\Lambda (1405)$, $\Lambda (1520)$, $\Lambda (1670)$, $\Sigma (1775)$ and $\Sigma (1915)$ resonances. The model allows for $CP$-violation effects, which are found to be consistent with zero. The branching fractions of ${\Xi }_b^{-}\to \Sigma (1385)K^{-}$, ${\Xi }_b^{-}\to \Lambda (1405)K^{-}$, ${\Xi }_b^{-}\to \Lambda (1520)K^{-}$, ${\Xi }_b^{-}\to \Lambda (1670)K^{-}$, ${\Xi }_b^{-}\to \Sigma (1775)K^{-}$ and ${\Xi }_b^{-}\to \Sigma (1915)K^{-}$ decays are also reported. In addition, an upper limit is placed on the product of ratios of ${\Omega }_b^{-}$ and ${\Xi }_b^{-}$ fragmentation fractions and the ${\Omega }_b^{-}\to p{K}^{-}{K}^{-}$ and ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ branching fractions.

arXiv commentAll figures and tables, along with machine-readable versions and any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2020-017.html (LHCb public pages)

References in corpus (54)

• XGBoost: A Scalable Tree Boosting System
• TensorFlow: Large-Scale Machine Learning on Heterogeneous Distributed Systems
• PYTHIA 6.4 Physics and Manual
• PYTHIA 6.2 Physics and Manual
• A Brief Introduction to PYTHIA 8.1
• Big-Bang Nucleosynthesis
• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• LHCb Detector Performance
• Efficient, reliable and fast high-level triggering using a bonsai boosted decision tree
• Mass distributions marginalized over per-event errors
• Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2
• Evidence for exotic hadron contributions to ${\Lambda }_b^0\to J/\psi p{\pi }^{-}$ decays
• Dalitz analysis of the three-body charmless decays B+=>K+Pi+Pi- and B+=>K+K+K-
• First observation of CP violation in the decays of Bs mesons
• Amplitude analysis of $B^{+}\to J/\psi \varphi K^{+}$ decays
• Dalitz plot analysis of $B_s^0\to {\bar{D}}^0{K}^{-}{\pi }^{+}$ decays
• Measurement of CP violation in the phase space of $B^{\pm }\to K^{\pm }{\pi }^{+}{\pi }^{-}$ and $B^{\pm }\to K^{\pm }{K}^{+}{K}^{-}$ decays
• Measurement of CP violation in the phase space of $B^{\pm }\to K^{+}{K}^{-}{\pi }^{\pm }$ and $B^{\pm }\to {\pi }^{+}{\pi }^{-}{\pi }^{\pm }$ decays
• Measurements of $CP$ violation in the three-body phase space of charmless $B^{\pm }$ decays
• Measurement of b-hadron fractions in 13 TeV pp collisions
• Measurement of $CP$ asymmetry in $D^0\to K^{-}{K}^{+}$ and $D^0\to {\pi }^{-}{\pi }^{+}$ decays
• Study of CP violation in Dalitz-plot analyses of B0 --> K+K-KS, B+ --> K+K-K+, and B+ --> KSKSK+
• Measurement of the $b$-quark production cross-section in 7 and 13 TeV $pp$ collisions
• Measurement of the Λ_b^0, Ξ_b^- and Ω_b^- baryon masses
• Precision measurement of D meson mass differences
• Study of the $D^{0}p$ amplitude in ${\Lambda }_b^0\to D^{0}p{\pi }^{-}$ decays
• Measurements of the Lambda_b0 -> J/psi Lambda decay amplitudes and the Lambda_b0 polarisation in pp collisions at sqrt(s) = 7 TeV
• Measurement of CP Asymmetries and Branching Fractions in Charmless Two-Body B-Meson Decays to Pions and Kaons
• Measurement of B meson production cross-sections in proton-proton collisions at sqrt(s)= 7 TeV
• Amplitude analysis of the $B^{+}\to {\pi }^{+}{\pi }^{+}{\pi }^{-}$ decay
• Measurements of Branching Fractions and Direct CP Asymmetries for B -> K pi, B->pi pi and B->to KK Decays
• Observation of several sources of $CP$ violation in $B^{+}\to {\pi }^{+}{\pi }^{+}{\pi }^{-}$ decays
• Observation of CP violation in B^0 -> eta' K^0 Decays
• Precision measurement of the mass and lifetime of the ${\Xi }_b^0$ baryon
• How good are your fits? Unbinned multivariate goodness-of-fit tests in high energy physics
• Amplitude analysis of $B^{\pm }\to {\pi }^{\pm }{K}^{+}{K}^{-}$ decays
• Measurements of Direct CP-Violating Asymmetries in Charmless Decays of Bottom Baryons
• Amplitude Analysis of the Decay B+- -> pi+- pi+- pi-+
• Observation of CP violation in B+ to DK+ decays
• Precision measurement of the mass and lifetime of the Xi_b^- baryon
• Measurement of the CP Violation Parameters in B0 -> pi+ pi- Decays
• Searches for ${\Lambda }_b^0$ and ${\Xi }_b^0$ decays to $K_{\mathrm{S}}^{0}p{\pi }^{-}$ and $K_{\mathrm{S}}^{0}p{K}^{-}$ final states with first observation of the ${\Lambda }_b^0\to K_{\mathrm{S}}^{0}p{\pi }^{-}$ decay
• Measurement of $CP$ asymmetries in two-body $B_{(s)}^0$-meson decays to charged pions and kaons
• Dalitz-plot decomposition for three-body decays
• Observations of ${\Lambda }_b^0\to \Lambda K^{+}{\pi }^{-}$ and ${\Lambda }_b^0\to \Lambda K^{+}{K}^{-}$ decays and searches for other ${\Lambda }_b^0$ and ${\Xi }_b^0$ decays to $\Lambda h^{+}{h}^{\prime -}$ final states
• Measurement of the mass and production rate of ${\Xi }_b^{-}$ baryons
• Search for $CP$ violation and observation of $P$ violation in ${\Lambda }_b^0\to p{\pi }^{-}{\pi }^{+}{\pi }^{-}$ decays
• Search for CP violation using triple product asymmetries in ${\Lambda }_b^0\to p{K}^{-}{\pi }^{+}{\pi }^{-}$, ${\Lambda }_b^0\to p{K}^{-}{K}^{+}{K}^{-}$ and ${\Xi }_b^0\to p{K}^{-}{K}^{-}{\pi }^{+}$ decays
• Measurement of the ${\Lambda }_b^0\to J/\psi \Lambda$ angular distribution and the ${\Lambda }_b^0$ polarisation in $pp$ collisions
• Observation of the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay
• Search for $CP$ violation in ${\Lambda }_b^0\to p{K}^{-}$ and ${\Lambda }_b^0\to p{\pi }^{-}$ decays
• Observation of the decay ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$
• Measurements of $CP$ asymmetries in charmless four-body ${\Lambda }_b$ and ${\Xi }_b^0$ decays
• Efficient description of experimental effects in amplitude analyses

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• Observation of the ${\Xi }_{\mathrm{b}}^{-}$ $\to$ $\psi$(2S)${\Xi }^{-}$ decay and studies of the ${\Xi }_{\mathrm{b}}$(5945)${}^0$ baryon in proton-proton collisions at $\sqrt{s}$ = 13 TeV
• Study of the resonance contributions in the ${\Xi }_b^{-}\to p{K}^{-}{K}^{-}$ decay
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• First evidence of $CP$ violation in beauty baryon to charmonium decays
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