EPJ

2021 Impact factor 3.131
EPJ A - Hadrons and Nuclei
Hadrons and Nuclei
Eur. Phys. J A 2, 99-104

Low-energy $\Lambda$-p scattering parameters from the $pp \to pK^+\Lambda$ Reaction

J.T. Balewski1,2 - A. Budzanowski1 - C. Goodman3 - D. Grzonka2 - M. Hofmann2 - L. Jarczyk4 - A. Khoukaz5 - K. Kilian2 - T. Lister5 - P. Moskal2,4 - W. Oelert2 - I.A. Pellmann2,5 - C. Quentmeier5 - R. Santo5 - G. Schepers5 - T. Sefzick2 - S. Sewerin2 - J. Smyrski4 - A. Strza\l kowski4 - C. Thomas5 - C. Wilkin6 - M. Wolke2 - P. Wüstner7 - D. Wyrwa2,4

1 Institute of Nuclear Physics, Cracow, Poland
2 IKP, Forschungszentrum Jülich, Germany
3 IUCF, Bloomington, Indiana, USA
4 Institute of Physics, Jagellonian University, Cracow, Poland
5 IKP, Westfälische Wilhelms-Universität, Münster, Germany
6 University College London, London WC1E 6BT, United Kingdom
7 ZEL, Forschungszentrum Jülich, Germany

Received: 5 March 1998 Communicated by B. Povh

Abstract
Constraints on the spin-averaged $\Lambda p$ scattering length and effective range have been obtained from measurements of the $pp\rightarrow pK^+\Lambda$ reaction close to the production threshold by comparing model phase-space Dalitz plot occupations with experimental ones. The data fix well the position of the virtual bound state in the $\Lambda p$ system. Combining this with information from elastic $\Lambda p$ scattering measurements at slightly higher energies, together with the fact that the hyperdeuteron is not bound, leads to a new determination of the low energy $\Lambda p$ scattering parameters.

PACS
12.38.Qk Experimental data - 13.85.Hd Inelastic scattering: many-particle final states - 25.40.Ve Other reactions above meson production thresholds (energies >400 MeV)

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