On the SigmaN cusp in the pp -> pK+Lambda reaction

Abstract

Measurements of the $pp\to p{K}^{+}\Lambda$ reaction at $T_p$ = 2.28 GeV have been carried out at COSY-TOF. In addition to the $\Lambda p$ FSI and $N^{\ast }$ resonance excitation effects a pronounced narrow structure is observed in the Dalitz plot and in its projection on the $p\Lambda$-invariant mass. The structure appears at the $pp\to$N$K^{+}\Sigma$ threshold and is interpreted as $\Sigma$N cusp effect. The observed width of 20 MeV/$c^2$ is substantially broader than anticipated from previous inclusive measurements. Angular distributions of this cusp structure are shown to be dissimilar to those in the residual $p{K}^{+}\Lambda$ channel, but similar to those observed in the $p{K}^{+}{\Sigma }^0$ channel.

References in corpus (5)

• Updated analysis of NN elastic scattering to 3 GeV
• Indication of a deeply bound compact K-pp state formed in the pp -> p Lambda K+ reaction at 2.85 GeV
• Improved study of a possible Theta+ production in the pp -> p K0 sigma+ reaction with the COSY-TOF spectrometer
• Study of the $\Lambda p$ Interaction Close to the ${\Sigma }^{+}n$ and ${\Sigma }^{0}p$ Thresholds
• Investigation of the reaction pp->p K0 pi+ Lambda in search of the pentaquark

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• Inclusive spectrum of the $d({\pi }^{+},K^{+})$ reaction at 1.69 GeV/c
• Final-State Interactions in the Process pp -> pKLambda
• Determination of N* amplitudes from associated strangeness production in p+p collisions
• ${\Sigma }^0$ production in proton nucleus collisions near threshold
• On the structure in the $\Lambda N$ cross section at the $\Sigma N$ threshold
• Combined Partial Wave Analysis for the description of exclusive $p+p\to p+K^{+}+\Lambda$ production