Final-State Interactions in the Process pp -> pKLambda
M. R\"oder, E. Borodina, H. Clement, E. Doroshkevich, R. Dzhygadlo, K., Ehrhardt, A. Erhardt, W. Eyrich, W. Gast, A. Gillitzer, D. Grzonka, J., Haidenbauer, C. Hanhart, F. Hauenstein, P. Klaja, L. Kober, K. Kilian, M., Krapp, M. Mertens, J. Ritman, E. Roderburg, W. Schroeder
TL;DR
This paper investigates how final-state interactions in the pp->pKLambda reaction can be used to determine the pLambda scattering length, highlighting experimental challenges and the influence of N*-resonances.
Contribution
It explores the feasibility of extracting the pLambda scattering length from polarization measurements and analyzes the impact of N*-resonances on the invariant mass spectrum.
Findings
Unexpected energy dependence of A_N observed
N*-resonances significantly affect the pLambda spectrum
Challenges in accurately determining the scattering length identified
Abstract
The possibility to determine the pLambda scattering length from the final-state interaction in the reaction pp->pKLambda is investigated experimentally. From a transversely polarized measurement, the K analyzing power (A_N) which, in principle, allows one to extract the spin triplet scattering length is studied. An unexpected energy dependence of the forward/backward symmetric part of A_N is found. The influence of N*-resonances on the pLambda invariant mass spectrum is investigated by exploiting the large acceptance for the process pp->pKLambda->pKppi and is found to be the main source of uncertainty for determining the pLambda scattering length.
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