Description: Phenomenology of the Lambda/Sigma0 production ratio in p p collisions

This title appears in the Scientific Report : 2006

Phenomenology of the Lambda/Sigma0 production ratio in p p collisions

We show that the recently measured asymmetry in helicity-angle spectra of the Lambda-hyperons, produced in the reaction pp -->K+ Lambda p reaction, and the energy dependence of the total pp --> K+ Lambda p cross-section can be explained consistently by the same Lambda p final-state interaction...

Personal Name(s):	Sibirtsev, A.
	Haidenbauer, J. / Hammer, H. W. / Meissner, U.G.
Contributing Institute:	Institut 3 (Theoretische Kernphysik); IKP-TH Jülich-Aachen Research Alliance - Simulation Sciences; JARA-SIM
Published in:	The @European physical journal / A, 29 (2006) S. 363 - 367
Imprint:	Berlin Springer 2006
Physical Description:	363 - 367
DOI:	10.1140/epja/i2006-10097-5
Document Type:	Journal Article
Research Program:	Physik der Hadronen und Kerne
Series Title:	European Physical Journal A 29
Subject (ZB):	p p: exclusive reaction Lambda: hadroproduction Sigma0: hadroproduction yield: ratio K+: associated production p Lambda: final-state interaction helicity: angular dependence angular distribution: asymmetry numerical calculations interpretation of experiments: Juelich COSY PS p p > > Lambda p K+ p p > > Sigma0 p K+
Link:	Get full text OpenAccess OpenAccess
	Publikationsportal JuSER

Please use the identifier: http://dx.doi.org/10.1140/epja/i2006-10097-5 in citations.
Please use the identifier: http://hdl.handle.net/2128/10561 in citations.

We show that the recently measured asymmetry in helicity-angle spectra of the Lambda-hyperons, produced in the reaction pp -->K+ Lambda p reaction, and the energy dependence of the total pp --> K+ Lambda p cross-section can be explained consistently by the same Lambda p final-state interaction. Assuming that there is no final-state interaction in the Sigma(0)p channel, as suggested by the available data for the reaction pp --> K+Sigma(0) p, we can also reproduce the energy dependence of the Lambda/Sigma(0) production ratio and, in particular,the rather large ratio observed near the reaction thresholds. The nominal ratio of the Lambda and Sigma(0) production amplitudes squared, i.e. when disregarding the final-state interaction, turns out to be about 3, which is in line with hyperon production data from proton and nuclear targets available at high energies.