Improved study of a possible Theta+ production in the pp -> p K0 sigma+ reaction with the COSY-TOF spectrometer

Abstract

The pp -> p K0 Sigma+ reaction was investigated with the TOF spectrometer at COSY at 3.059 GeV/c incident beam momentum. The main objective was to clarify whether or not a narrow exotic S = +1 resnance, the Theta+ pentaquark, is populated at 1.53 GeV/c2 in the K0 p subsystem with a data sample of much higher statistical significance compared to the previously reported data in this channel. An analysis of these data does not confirm the existence of the Theta+ pentaquark. This is expressed as an upper limit for the cross section sigma (pp -> p K0 Sigma+) < 0.15 microbarn at the 95 percent confidence level.

11 pages, 5 figures

References in corpus (3)

• Further evidence for formation of a narrow baryon resonance with positive strangeness in K+ collisions with Xe nuclei
• Search for Theta+ via pi- p --> K- X reaction near production threshold
• The narrow pentaquark

Cited by in corpus (6)

• Evidence of the Θ^+ in the γd \to K^+K^-pn reaction
• The energy dependence of the pp->K+ n Sigma+ reaction close to threshold
• Present status on experimental search for pentaquarks
• An explanation why the Theta+ is seen in some experiments and not in others
• Systematic study of pentaquark states: $qqq-q\bar{q}$ configuration
• Baryon-baryon and baryon-antibaryon interaction amplitudes in the spin--momentum operator expansion method