Evidence of a $J/\psi \Lambda$ structure and observation of excited ${\Xi }^{-}$ states in the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay

Abstract

First evidence of a structure in the $J/\psi \Lambda$ invariant mass distribution is obtained from an amplitude analysis of ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decays. The observed structure is consistent with being due to a charmonium pentaquark with strangeness. Its mass and width are determined to be $4458.8\pm 2.9{}_{-1.1}^{+4.7}$MeV and $17.3\pm 6.5{}_{-5.7}^{+8.0}$MeV, where the quoted uncertainties are statistical and systematic, respectively. The structure is also consistent with being due to two resonances. In addition, the narrow excited ${\Xi }^{-}$ states, $\Xi (1690{)}^{-}$ and $\Xi (1820{)}^{-}$, are seen for the first time in a ${\Xi }_b^{-}$ decay, and their masses and widths are measured with improved precision. The analysis is performed using $pp$ collision data corresponding to a total integrated luminosity of 9fb${}^{-1}$, collected with the LHCb experiment at centre-of-mass energies of $7$, $8$ and $13$TeV.

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-2020-039.html (LHCb public pages)

References in corpus (27)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• A Brief Introduction to PYTHIA 8.1
• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• LHCb Detector Performance
• PHOTOS Monte Carlo: a precision tool for QED corrections in Z and W decays
• sPlot: a statistical tool to unfold data distributions
• TMVA - Toolkit for Multivariate Data Analysis
• Observation of a narrow pentaquark state, $P_c(4312{)}^{+}$, and of two-peak structure of the $P_c(4450{)}^{+}$
• The LHCb Trigger and its Performance in 2011
• Prediction of narrow $N^{\ast }$ and ${\Lambda }^{\ast }$ resonances with hidden charm above 4 GeV
• Decay Chain Fitting with a Kalman Filter
• Mass distributions marginalized over per-event errors
• Model-independent evidence for $J/\psi p$ contributions to ${\Lambda }_b^0\to J/\psi p{K}^{-}$ decays
• Prediction of hidden charm strange molecular baryon states with heavy quark spin symmetry
• Spectrum of the strange hidden charm molecular pentaquarks in chiral effective field theory
• Compact pentaquark structures
• Looking for a hidden-charm pentaquark state with strangeness $S=-1$ from ${\Xi }_b^{-}$ decay into $J/\psi K^{-}\Lambda$
• Possible strange hidden-charm pentaquarks from ${\Sigma }_c^{(\ast )}{\bar{D}}_s^{\ast }$ and ${\Xi }_c^{{(}^{\prime },\ast )}{\bar{D}}^{\ast }$ interactions
• Coupled-Channel Model for $\bar{K}N$ Scattering in the Resonant Region
• sFit: a method for background subtraction in maximum likelihood fit
• Measurement of the cross section for $e^{+}{e}^{-}\to {\Xi }^{-}{\bar{\Xi }}^{+}$ and observation of an excited $\Xi$ baryon
• Observation of $\Xi (1620{)}^0$ and evidence for $\Xi (1690{)}^0$ in ${\Xi }_c^{+}\to {\Xi }^{-}{\pi }^{+}{\pi }^{+}$ decays
• Decay behaviors of possible ${\Lambda }_{c\bar{c}}$ states in hadronic molecule pictures
• Dalitz-plot decomposition for three-body decays
• Observation of the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay
• Measurements of $\psi (3686)\to K^{-}\Lambda {\bar{\Xi }}^{+}+c.c.$ and $\psi (3686)\to \gamma K^{-}\Lambda {\bar{\Xi }}^{+}+c.c$
• A novel method to test particle ordering and final state alignment in helicity formalism

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