Search for exotic baryons with hidden strangeness in proton diffractive production at the energy of 70 GeV

We utilize existing inclusive data on K + -meson momentum spectra of the reaction pp→K + X at Tp = 2.3 -2.85 GeV to deduce total cross sections for pp→K + Σ + n. The method used to extract those cross sections is explained and discussed in detail. Our result for Tp = 2.85 GeV is consistent with the data point from a direct measurement at the same beam energy. The cross section obtained for Tp = 2.3 GeV is with 13.7 ± 2.3 µb considerably smaller than the value found in a recent experiment by the COSY-11 Collaboration at a somewhat lower beam energy, indicating that the pp→K + Σ + n reaction cross section could exhibit a rather unusual energy dependence. PACS. 13.75.Ev Hyperon-nucleon interactions -13.75.Jz Kaon-baryon interactions -14.20.Gk Baryon resonances with S=0 -25.40.Ny Resonance reactions

show abstract

“…An indication for a possible crypto-exotic baryon was also reported in Ref. [36], based on an analysis of the Σ 0 K + invariant mass spectrum.…”

Section: Resultssupporting

confidence: 66%

The pp→K+ Σ +n cross-section from missing-mass spectra

et al. 2007

View full text Add to dashboard Cite

show abstract

“…The high-statistics study of Ref. [93] of the Σ 0 K + mass spectrum indicates two exotic states with M = 1807±7 MeV, Γ = 62±19 MeV and M = 1986±6 MeV, Γ = 91±20 MeV.…”

Section: Speculationsmentioning

confidence: 93%

“…Experimental observations for the B φ candidates were reported in Refs. [88,89,90,91,92,93]. The high-statistics study of Ref.…”

Section: Speculationsmentioning

confidence: 99%

φ-meson photoproduction from nuclei

et al. 2006

View full text Add to dashboard Cite

We study coherent and incoherent φ-meson photoproduction from nuclei. The available data are analyzed in terms of single and coupled channel photoproduction. It is found that the data on coherent photoproduction can be well reproduced within a single channel optical model and show only little room for ω − φ mixing. These data indicate a normal distortion of the φ-meson in nuclei, which is compatible with the results obtained through the vector meson dominance model. The data on incoherent φ-meson photoproduction show an anomalous A-dependence resulting in a very strong φ-meson distortion. These data can be explained by a coupled channel effect through the dominant contribution from the ω → φ or π→φ transition or, more speculative, through the excitation of a cryptoexotic B φbaryon. PACS. 11.80.Gw Multichannel scattering -12.40.Vv Vector-meson dominance -13.60.-r Photon and charged-lepton interactions with hadrons -25.20.Lj Photoproduction reactions

show abstract

“…Experimental limits for the B φ candidates were reported in Refs. [31,35,36,37,38,39]. There are two independent observations of a narrow peak in the Σ(1385) 0 K + spectra, the first one with a mass M = 2050±6 MeV and width Γ ≤ 50±19 MeV [37] and the second one with M = 1956 +8 −6 MeV and Γ =27 ± 15 MeV [35].…”

Section: Speculations On Exotic Baryonsmentioning

confidence: 99%

“…The high-statistics study of Ref. [39] of the Σ 0 K + mass spectrum indicates two exotic states with M = 1807±7 MeV, Γ = 62±19 MeV and M = 1986±6 MeV, Γ = 91±20 MeV.…”

Section: Speculations On Exotic Baryonsmentioning

confidence: 99%

Aspects of φ-meson production in proton-proton collisions

2006

View full text Add to dashboard Cite

Abstract. We analyze near-threshold cross section data for the reaction pp→ppφ published by the DISTO collaboration and recent, still preliminary results presented by the ANKE Collaboration. We formulate a procedure to evaluate the OZI ratio at low energies by taking into account corrections from the kinematics and the final-state interaction. Combining the new data with the few measurements available at higher energies we give a limit for the OZI rule violation and estimate the possible contribution from a five-quark baryonic resonance coupled to the φp system.

show abstract

Search for exotic baryons with hidden strangeness in proton diffractive production at the energy of 70 GeV

Cited by 7 publications

References 12 publications

The pp→K+ Σ +n cross-section from missing-mass spectra

The pp→K+ Σ +n cross-section from missing-mass spectra

φ-meson photoproduction from nuclei

Aspects of φ-meson production in proton-proton collisions

Contact Info

Product

Resources

About