Evidence for a new structure in the $J/\psi p$ and $J/\psi \bar{p}$ systems in $B_s^0\to J/\psi p\bar{p}$ decays

Abstract

An amplitude analysis of flavour-untagged $B_s^0\to J/\psi p\bar{p}$ decays is performed using a sample of $797\pm 31$ decays reconstructed with the LHCb detector. The data, collected in proton-proton collisions between 2011 and 2018, correspond to an integrated luminosity of 9 ${\text{fb}}^{-1}$. Evidence for a new structure in the $J/\psi p$ and $J/\psi \bar{p}$ systems with a mass of $4337{}_{-4}^{+7}{}_{-2}^{+2}\text{MeV}$ and a width of $29{}_{-12}^{+26}{}_{-14}^{+14}\text{MeV}$ is found, where the first uncertainty is statistical and the second systematic, with a significance in the range of 3.1 to 3.7 $\sigma$, depending on the assigned $J^P$ hypothesis.

arXiv commentAll figures and tables, along with any supplementary material and additional information, are available at https://cern.ch/lhcbproject/Publications/p/LHCb-PAPER-2021-018.html (LHCb public pages)

References in corpus (31)

• A Brief Introduction to PYTHIA 8.1
• Hadronic molecules
• Observation of $J/\psi p$ resonances consistent with pentaquark states in ${\Lambda }_b^0\to J/\psi K^{-}p$ decays
• LHCb Detector Performance
• Multiquark Resonances
• Non-Standard Heavy Mesons and Baryons, an Experimental Review
• 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
• Decay Chain Fitting with a Kalman Filter
• Performance of the LHCb Vertex Locator
• Threshold cusps and triangle singularities in hadronic reactions
• Performance of the LHCb Outer Tracker
• Performance of the LHCb muon system
• Evidence of a $J/\psi \Lambda$ structure and observation of excited ${\Xi }^{-}$ states in the ${\Xi }_b^{-}\to J/\psi \Lambda K^{-}$ decay
• Exotic hadrons: review and perspectives
• Observation of a resonance X(1835) in J/ψ--> γπ^+ π^- η^{\prime}
• Selection and processing of calibration samples to measure the particle identification performance of the LHCb experiment in Run 2
• Precision measurement of $CP$ violation in $B_s^0\to J/\psi K^{+}{K}^{-}$ decays
• Observation of B0bar --> D(*)0 p pbar
• Spin-Parity Analysis of ppbar Mass Threshold Structure in J/psi and psi' Radiative Decays
• Low-Mass Baryon-Antibaryon Enhancements in B Decays
• Observation of B+ -> p pbar pi+, B0 -> p pbar K0, and B+ -> p pbar K*+
• Dalitz-plot decomposition for three-body decays
• Exploratory study of possible resonances in the heavy meson - heavy baryon coupled-channel interactions
• Measurements of the branching fractions of $B^{+}\to p\bar{p}{K}^{+}$ decays
• A study of $CP$ violation in $B^{\mp }\to D{h}^{\mp }$ ($h=K,\pi$) with the modes $D\to K^{\mp }{\pi }^{\pm }{\pi }^0$, $D\to {\pi }^{+}{\pi }^{-}{\pi }^0$ and $D\to K^{+}{K}^{-}{\pi }^0$
• Observation of $B_{(s)}^0\to J/\psi p\overline{p}$ decays and precision measurements of the $B_{(s)}^0$ masses
• A novel method to test particle ordering and final state alignment in helicity formalism
• Helicity amplitudes for generic multi-body particle decays featuring multiple decay chains
• $f_J(2220)$ and Hadronic ${\bar{B}}_s^0$ Decays
• Centrifugal-Barrier Effects and Determination of the Interaction Radius

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• An updated review of the new hadron states
• Observation of an exotic narrow doubly charmed tetraquark
• Chiral perturbation theory for heavy hadrons and chiral effective field theory for heavy hadronic molecules
• 50 Years of Quantum Chromodynamics
• Observation of a $J/\psi \Lambda$ resonance consistent with a strange pentaquark candidate in $B^{-}\to J/\psi \Lambda \bar{p}$ decays
• Investigation of magnetic moment of $P_{cs}(4338)$ and $P_{cs}(4459)$ pentaquark states
• Analysis of the $P_{cs}(4338)$ and related pentaquark molecular states via the QCD sum rules
• Heavy Flavour Physics and CP Violation at LHCb: a Ten-Year Review
• Interpretations of the new LHCb $P_c(4337{)}^{+}$ pentaquark state
• Compact hidden charm pentaquark states and QCD isomers
• Fully-charm and -bottom pentaquarks in a Lattice-QCD inspired quark model
• Anticharmed strange pentaquarks from the one-boson-exchange model
• Hidden-charm pentaquark states in a mass splitting model
• Molecular ${\Omega }_{cc}$ , ${\Omega }_{bb}$ and ${\Omega }_{bc}$ states
• $P_c$ states and their open-charm decays with the complex scaling method
• Photo- and electro-production of narrow exotic states: from light quarks to charm and up to bottom
• Doubly charmed pentaquark states in QCD sum rules
• Observation of the ${\Lambda }_{\text{b}}^0$ $\to$ J/$\psi {\Xi }^{-}$K${}^{+}$ decay
• Investigations on the light hadron decays of $Z_b(10610)$ and $Z_b(10650)$
• Investigation of a candidate spin-$\frac{1}{2}$ hidden-charm triple strange pentaquark state $P_{csss}$
• Covalent hadronic molecules induced by shared light quarks
• Unravelling Pentaquarks with Born--Oppenheimer effective theory
• Investigating the transition form factors of ${\Lambda }_b\to {\Lambda }_c(2625)$ and ${\Xi }_b\to {\Xi }_c(2815)$ and the corresponding weak decays with support from baryon spectroscopy
• Bottomonium-like tetraquarks in a chiral quark model
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• The Production of Singly Charmed Pentaquark $\bar{c}qqqq$ from Bottom Baryon
• Production of pentaquarks with hidden charm and double strangeness in ${\Xi }_b$ and ${\Omega }_b$ decays
• Observation of the open-charm tetraquark candidate $T_{cs0}^{\ast }(2870{)}^0$ in the $B^{-}\to D^{-}{D}^0{K}_{\mathrm{S}}^0$ decay
• Measurement of $e^{+}{e}^{-}\to \Lambda \bar{\Lambda }\eta$ from 3.5106 to 4.6988 GeV and study of $\Lambda \bar{\Lambda }$ mass threshold enhancement
• Molecular $P_{\psi }$ pentaquarks from light-meson exchange saturation
• Production mechanism of hidden-charm pentaquark states $P_{c\bar{c}s}$ with strangeness $S=-1$
• Measurement of f${}_1$(1285) production in pp collisions at $\sqrt{\text{s}}$ = 13 TeV
• $P_c(4457)$ interpreted as a $J^P=1/2^{+}$ state by ${\bar{D}}^0{\Lambda }_c^{+}(2595)$-${\pi }^0{P}_c(4312)$ interaction
• The Pentaquark Spectrum from Fermi Statistics
• A Simple Model of Pentaquarks
• Triple-strangeness hidden-charm pentaquarks
• Observation of the ${\Lambda }_b^0\to J/\psi {\Xi }^{-}{K}^{+}$ and ${\Xi }_b^0\to J/\psi {\Xi }^{-}{\pi }^{+}$ decays
• Radiative decay and axial-vector decay behaviors of octet pentaquark states
• Analysis of bound and resonant states of doubly heavy tetraquarks with spin $J\le 2$
• Strong decays of the $P_c(4312)$ and its isospin cousin via the QCD sum rules
• Production of $X_{cs\bar{c}\bar{s}}$ in heavy ion collisions
• Doubly-charmed pentaquark states in a mass splitting model
• First observation of the ${\Lambda }_b^0\to {\Lambda }_c^{+}{D}_s^{-}{K}^{+}{K}^{-}$ decay and search for pentaquarks in the ${\Lambda }_c^{+}{D}_s^{-}$ system
• $D$-wave excited $cs\bar{c}\bar{s}$ tetraquark states with $J^{PC}=1^{++}$ and $1^{+-}$
• Strong decays of the $P_{cs}(4338)$ and its high isospin cousin via the QCD sum rules
• Hidden charm ${\mathcal{P}}_{cs}(4338{)}^0$ production in baryonic $B^{-}\to J/\psi \Lambda \bar{p}$ decay
• Multimodal Fragmentation of All-Heavy Pentaquarks: Uncertainty-Aware Predictions for Hadron Colliders
• Role of the short-range dynamics in simultaneous interpretation of $P_{cs}$ pentaqurks via ${\Xi }_c^{(\prime ,\ast )}{\bar{D}}^{(\ast )}$ molecules
• Possible ${\bar{D}}^{(\ast )}{\Xi }_{cc}^{(\ast )}$ and ${\Xi }_{cc}^{(\ast )}{\Xi }_{cc}^{(\ast )}$ molecules as superflavor partners of $T_{cc}$
• Analytic electromagnetic signatures of compact pentaquark structure: A multi-current QCD light-cone sum rules analysis of the $P_{\psi s}^{\Lambda }$ states
• Searching for a $P_{cs}(4200)$ state in the ${\Lambda }_b\to \varphi {\eta }_c\Lambda$ reaction
• Study of $e^{+}{e}^{-}\to h^{+}{h}^{-}J/\psi (h=\pi ,K,p)$ via initial-state radiation at Belle~II
• Exotic hadrons associated with $b$-quark