Observation of an Exotic S = -2, Q = -2 Baryon Resonance in Proton-Proton Collisions at the CERN SPS

Abstract

Results of resonance searches in the Xi- pi-, Xi- pi+, antiXi+ pi- and antiXi+ pi+ invariant mass spectra in proton-proton collisions at sqrt{s}=17.2 GeV are presented. Evidence is shown for the existence of a narrow Xi- pi- baryon resonance with mass of 1.862+/-0.002 GeV/c^2 and width below the detector resolution of about 0.018 GeV/c^2. The significance is estimated to be 4.0 sigma. This state is a candidate for the hypothetical exotic Xi_(3/2)^-- baryon with S = -2, I = 3/2 and a quark content of (d s d s ubar). At the same mass a peak is observed in the Xi- pi+ spectrum which is a candidate for the Xi_(3/2)^0 member of this isospin quartet with a quark content of (d s u s dbar). The corresponding antibaryon spectra also show enhancements at the same invariant mass.

5 pages, 3 figures

References in corpus (7)

• Evidence for Narrow S=+1 Baryon Resonance in Photo-production from Neutron
• Diquarks and Exotic Spectroscopy
• Exotic Anti-Decuplet of Baryons: Prediction from Chiral Solitons
• Observation of an Exotic $S=+1$ Baryon in Exclusive Photoproduction from the Deuteron
• Observation of a baryon resonance with positive strangeness in K+ collisions with Xe nuclei
• Evidence for the positive-strangeness pentaquark ${\Theta }^{+}$ in photoproduction with the SAPHIR detector at ELSA
• Exotic baryon states in topological soliton models

Cited by in corpus (185)

• Exotics: Heavy Pentaquarks and Tetraquarks
• The Physics of the B Factories
• Baryon spectroscopy
• Production of $\Sigma (1385{)}^{\pm }$ and $\Xi (1530{)}^0$ in proton-proton collisions at $\sqrt{s}=$ 7 TeV
• Evidence for a narrow baryonic state decaying to K0s-p and K0s-pbar in deep inelastic scattering at HERA
• Evidence for a Narrow Anti-Charmed Baryon State
• Reinterpreting several narrow `resonances' as threshold cusps
• Nonstrange and other unitarity partners of the exotic Theta+ baryon
• Detailed Analysis of the Tetraquark Potential and Flip-Flop in SU(3) Lattice QCD
• Hadron Production and Phase Changes in Relativistic Heavy Ion Collisions
• Chiral-Soliton Predictions for Exotic Baryons
• Experimental Search for Pentaquarks
• Z^* Resonances: Phenomenology and Models
• A study of pentaquarks on the lattice with overlap fermions
• The Hadronic Final State at HERA
• Search for ${\Theta }^{+}(1540)$ pentaquark in high statistics measurement of $\gamma p\to {\bar{K}}^0{K}^{+}n$ at CLAS
• First Study for the Pentaquark Potential in SU(3) Lattice QCD
• Limits for the central production of Theta^+ and Xi^{--} pentaquarks in 920 GeV pA collisions
• Where are the missing members of the baryon antidecuplet?
• Possibility of the existence of charmed exotica
• QCD and the Strange Baryon Spectrum
• Search for the ${\Theta }^{+}$ pentaquark in the reactions $\gamma p\to {\bar{K}}^0{K}^{+}n$ and $\gamma p\to {\bar{K}}^0{K}^{0}p$
• Photoproduction of eta-mesons on the deuteron above S11(1535) in the presence of a narrow P11(1670) resonance
• Systematics of Exotic Cascade Decays
• High Statistics Search for the Theta+(1.54) Pentaquark State
• Photoproduction of Xi off nucleons
• Pentaquark Searches at CDF
• Light-Front Approach for Heavy Pentaquark Transitions
• Spectroscopy of pentaquark states
• Strangeness fluctuations and MEMO production at FAIR
• A Naturally Narrow Positive Parity Theta^+
• Exotic and nonexotic magnetic transitions in the context of the SELEX and GRAAL experiments
• Pentaquark Theta^+(1540) production in gamma N --> K Anti-K N
• Search for the Theta+ pentaquark in the gamma d -> Lambda n K+ reaction measured with CLAS
• The static tetraquark and pentaquark potentials
• Anti-charmed pentaquark ${\Theta }_c(3099)$ from QCD sum rules
• Search for a narrow charmed baryonic state decaying to D^*+/- p^-/+ in ep collisions at HERA
• The string-junction picture of multiquark states: an update
• Search for the exotic ${\Xi }^{--}(1860)$ Resonance in 340GeV/c ${\Sigma }^{-}$-Nucleus Interactions
• Pentaquark baryons in SU(3) quark model
• Study the exotic ${\Theta }^{+}$ with polarized photon beams
• Exclusive Photoproduction of the Cascade (Xi) Hyperons
• Extraction of the pion-nucleon sigma-term from the spectrum of exotic baryons
• Octet, decuplet and antidecuplet magnetic moments in the chiral quark soliton model revisited
• On the Existence of Heavy Pentaquarks: The large Nc and Heavy Quark Limits and Beyond
• Baryon Exotics in the Quark Model, the Skyrme Model and QCD
• Experimental Review on Pentaquarks
• Hints for the existence of hexaquark states in the baryon-antibaryon sector
• Strange Pentaquark Hadrons in Statistical Hadronization
• Magnetic Moment of The ${\Theta }^{+}$ Pentaquark State
• Magnetic moments of antidecuplet pentaquarks
• Reviewing the Evidence for Pentaquarks
• Have Pentaquark States Been seen?
• Why $\Xi (1690)$ and $\Xi (2120)$ are so narrow?
• Properties of baryon anti-decuplet
• Are there S=-2 Pentaquarks?
• Evidence for the J^p=1/2^+ narrow state at 1650 MeV in the photoproduction of KLambda
• Search for the Phi(1860) Pentaquark at COMPASS
• Search for pentaquarks decaying to Xi-pi in deep inelastic scattering at HERA
• Heavy Pentaquarks
• CKM Results From CLEO
• Search for an exotic S=-2, Q=-2 baryon resonance at a mass near 1862 MeV in quasi-real photoproduction
• The colour triplet qqqbar cluster and pentaquark models
• Dynamical study of the pentaquark antidecuplet
• Pentaquark searches at FOCUS
• Instanton induced quark dynamics and the pentaquark
• A Diquark Chiral Effective Theory and Exotic Baryons
• The 27-plet Baryons from Chiral Soliton Models
• Exotic Baryons and Monopole Excitations in a Chiral Soliton Model
• Pentaquarks: Review on Models and Solitonic Calculations of Antidecuplet Magnetic Moments
• Prospects for Pentaquark Production at Meson Factories
• Coupled $K^{+}\Lambda$ and $K^0\Lambda$ photoproduction off the nucleon: Consequences from the recent CLAS and MAMI data and the $N(1680)P_{11}$ narrow state
• Spin 3/2 Penta-quarks in anisotropic lattice QCD
• Present status on experimental search for pentaquarks
• Pentaquark Decay Width in QCD Sum Rules
• 1/N Expansion for Exotic Baryons
• The X(3872) Meson and "Exotic" Spectroscopy at CDF II
• Pentaquark ${\Theta }^{\ast }$ States in {27} Baryon Multiplet from Chiral Soliton Model
• Pentaquarks: review of the experimental evidence
• Negative parity pentaquarks in large Nc QCD and quark model
• Triquark correlations and pentaquarks in a QCD sum rule approach
• Axial-vector transitions and strong decays of the baryon antidecuplet in the self-consistent SU(3) chiral quark-soliton model
• A comprehensive search for the Θ^+ pentaquark on the lattice
• Search for a pentaquark decaying to p K_S^0
• Light-Front Approach for Pentaquark Strong Decays
• Isospin Mixing of Narrow Pentaquark States
• A Phenomenological Lagrangian Approach to Two Kaon Photoproduction and Pentaquark Searches
• Even Parity $\Theta$-Pentaquark and Stable Strange Nuclear Matter
• Photoproduction of ${\Theta }^{+}$ and other pentaquark states
• An Experimental Review of the ${\Theta }^{+}$ Pentaquark
• Pentaquarks: Status and Perspectives for Lattice Calculations
• Photoproduction of the Theta^+ resonance on the nucleon in a Regge model
• Quark spin content of the proton, hyperon semileptonic decays, and the decay width of the ${\Theta }^{+}$ pentaquark
• Comparative Regge analysis of $\Lambda ,{\Sigma }^0,\Lambda (1520)$ and ${\Theta }^{+}$ production in $\gamma p$, $\pi p$ and $pp$ reactions
• Search for the Charmed Pentaquark Candidate Theta_c(3100) in e+e- Annihilations at sqrt(s)=10.58 GeV
• Phenomenology of spin 3/2 baryons with pentaquarks
• A Comparative Study of Pentaquark Interpolating Currents
• Spin asymmetries in gamma + N --> K*bar + Theta^+
• High Energy Photoproduction
• Threshold production of the ${\Theta }^{+}$ in a polarized proton reaction
• Two-meson cloud contribution to the baryon antidecuplet binding
• Pentaquark as Kaon-Nucleon Resonance
• Search for Exotic Baryons in 800 GeV pp (rtarrow) pXiPiX
• Photoproduction of pentaquark cascades from nucleons
• Narrow width pentaquarks
• Search for Baryonic Resonances Decaying to Xi pi in Deep-Inelastic Scattering at HERA
• A Mass Inequality for the ${\Xi }^{\ast }$ and ${\Theta }^{+}$ Pentaquarks
• Effects of Instanton Induced Interaction on the Pentaquarks
• Broken SU(3) antidecuplet for ${\Theta }^{+}$ and ${\Xi }_{3/2}$
• Are the anti-charmed and bottomed pentaquarks molecular heptaquarks?
• The discovery and properties of pentaquarks
• Today's View on Strangeness
• Heavy Quark Analogues of the Theta and Their Excitations
• Heavy and Light Pentaquark Chiral Lagrangian
• Search for a pentaquark decaying to Cascade- pi-
• On strange SU(3) partners of Theta+
• On Some properties of Di-hadronic states
• Variational Monte Carlo study of pentaquark states
• Hadronic Decays Involving Heavy Pentaquarks
• Prospects for Pentaquark Searches in $e^{+}{e}^{-}$ Annihilations and $\gamma \gamma$ Collisions
• The anti-decuplet candidate Xi--(1862) as a heptaquark with the overlap of two anti-kaons and a nucleon
• Exotic particle searches with STAR at RHIC
• Strange Exotic States and Compact Stars
• Phenomenological constraints on the Jaffe-Wilczek model of pentaquarks
• Search for Exotic S=-2 Baryons in proton-antiproton Collisions at sqrt(s) = 1.96 TeV
• Flavored exotic multibaryons and hypernuclei in topological soliton models
• Production of the pentaquark ${\Theta }^{+}$ in $np$ scattering
• Moments of inertia, nucleon axial-vector coupling, the {\bf 8}, {\bf 10}, $\overline{10}$ and ${27}_{3/2}$ mass spectrums and the higher SU(3)_f representation mass splittings in the Skyrme model
• Exotic Baryons in Two-Dimensional QCD
• Baryon Spectrum in Large N(C) Chiral Soliton and in Quark Models
• Photoproduction and Radiative Decay of Spin 1/2 and 3/2 Pentaquarks
• Summary of ICHEP 2004
• Mass splittings of the baryon decuplet and antidecuplet with the second-order flavor symmetry breakings within a chiral soliton model
• Search for Pentaquarks in the Hadronic Decays of the Z Boson with the DELPHI Detector at LEP
• The Experimental Search for Pentaquark
• SU(3) constraints on cryptoexotic pentaquarks
• Parity of Anti-Decuplet Baryons Revisited from Chiral Soliton Models
• Stable Pentaquarks from Strange Chiral Multiplets
• Light Scalar Decay in Diquark Chiral Effective Theory
• Electric properties of the baryon anti-decuplet in the SU(3) chiral quark-soliton model
• The exotic baryon mass spectrum and the decuplet-octet and antidecuplet-octet mass difference in the Skyrme model
• Micro-canonical pentaquark production in $\ee$ annihilations
• Upper limits for the photoproduction cross section for the Phi--(1860) pentaquark state off the deuteron
• Calculating loops without loop calculations: NLO computation of pentaquark correlators
• Positive parity pentaquark towers in large Nc QCD
• SU(6), Triquark states, and the pentaquark
• Strangeness and heavy flavor at RHIC: Recent results from PHENIX
• Tetraquark and Pentaquark Systems in Lattice QCD
• Highlights of Recent Results with Clas
• Lower Excitation Spectrum of the Nucleon and Delta in a Relativistic Chiral Quark Model
• Structure and reactions of pentaquark baryons
• Recent results from NA61/SHINE
• The 35-plet Baryons from Chiral Soliton Models
• Structure of light and heavy pentaquarks
• Possible production of exotic baryonia in relativistic heavy-ion collisions
• Pentaquarks in string dynamics
• Pentaquark Masses in Chiral Perturbation Theory
• Prediction of the masses and decay processes of strange, charmed and bottomed pentaquarks from the linear molecular crypto-heptaquark model
• Status of Pentaquark Search at Jlab
• The Skyrme model predictions for the ${27}_{J=3/2}$ mass spectrum and the ${27}_{3/2}$-$\overline{10}$ mass splittings
• Present status of the nonstrange and other flavor partners of the exotic Theta+ baryon
• Determination of the parity of the pentaquark baryons : Theta^+ and Xi_5
• Beyond CP violation: hadronic physics at BaBar
• Quarkonia & Pentaquarks
• Search for an exotic S=-2, Q=-2 baryon resonance in proton-proton interactions at $\sqrt{s_{NN}}$ = 17.3 GeV
• Heavy Antiquark Pentaquarks in the CM and GB Models
• New narrow nucleon resonances $N^{\ast }(1685)$ and $N^{\ast }(1726)$ within the chiral quark-soliton model
• Challenges in Hadron Physics
• Relativistic Calculation of the Width of the Theta (1540) Pentaquark
• Pentaquarks in the medium in the quark-meson coupling model
• Representation Mixing and Exotic Baryons in the Skyrme Model
• Molecular pentaquarks composed of a ground-state octet baryon and a $P-$wave anticharmed meson
• Constituent quark models and pentaquark baryons
• Exotic hadrons from dynamical clustering of quarks in ultrarelativistic heavy ion collisions
• Light Front Approach for Strong and Weak Decays of Pentaquarks
• Statistical hadronization phenomenology in heavy ion collisions at SPS and RHIC energies
• The Pentaquarks in the Linear Molecular Heptaquark Model
• Skyrmions and pentaquarks in the quark-hadron continuity perspective
• The Nucleon and Delta Baryons in the Unified Picture for Hadron Spectra
• Are the Theta+(1540), Xi--(1860) and D*-p(3100) Pentaquarks or Heptaquarks?
• Kinematic selection criteria in a new resonance searches: Application to pentaquark states
• Quark Model and multiquark system
• Spectroscopy in ep collisions at HERA
• Two-meson cloud contribution to the baryon antidecuplet self-energy
• Heavy Pentaquarks in the Diquark Model and the Large N_c Expansion