Testing the nature of the Lambda(1520) resonance in proton-induced production

Roca, L.; Oset, E.; Hanhart, C.; Meissner, U.G.

doi:10.1140/epja/i2006-10009-9

Journal Article

PreJuSER-54775

Testing the nature of the Lambda(1520) resonance in proton-induced production

Roca, L. ; Hanhart, C.FZJ* ; Oset, E. ; Meissner, U. G.FZJ*

2006
Springer Berlin

The European physical journal / A 27, 373 (2006) [10.1140/epja/i2006-10009-9]

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Please use a persistent id in citations: http://hdl.handle.net/2128/10590 doi:10.1140/epja/i2006-10009-9

Abstract: The Lambda(1520)-resonance has been recently studied in a unitarized coupled-channel formalism with pi Sigma(1385), K Xi(1530), (K) over barN and pi Sigma as constituents blocks. We provide a theoretical study of the predictions of this model in physical observables of the pp -> pK(+)K(-) p and pp -> pK(+)pi(0)pi(0)Lambda reactions. In particular, we show that the ratio between the pi(0)pi(0)Lambda and K(-)p mass distributions can provide valuable information on the ratio of the couplings of the Lambda(1520)-resonance to pi Sigma(1385) and (K) over barN than the theory predicts. Calculations are done for energies which are accessible in an experimental facility like COSY at Julich or the developing CSR facility at Lanzhou.

Keyword(s): p p: exclusive reaction ; K: pair production ; K+: hadroproduction ; Lambda: associated production ; pi0: pair production ; unitarity ; partial wave analysis: coupled channel ; Bethe-Salpeter equation ; Lambda(1520): hadronic decay ; Lambda(1520): coupling ; mass spectrum: (Lambda 2pi0) ; mass spectrum: (p K-) ; mass spectrum: ratio ; numerical calculations ; p p --> 2p K+ K- ; p p --> Lambda p K+ 2pi0