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HK: Fachverband Physik der Hadronen und Kerne

HK 43: Hadronenstruktur und -spektroskopie VIII

HK 43.2: Vortrag

Mittwoch, 23. März 2011, 16:45–17:00, HS3

K_s⁰ Production in p+p and p+Nb Reactions at 3.5 GeV with HADES — •Jia-Chii Chen — Excellence Cluster “Universe”, TU München, Boltzmannstr. 2, 85748 Garching, Germany

Recent results on the kaon-nucleon (KN) interaction have pointed out a repulsive in-medium potential of kaons at normal nuclear density. Nevertheless different values of the KN potential were obtained varying from 20±5 MeV [1] to ∼39 MeV [2]. To contribute to the understanding of the KN potential the K_s⁰ meson production was investigated for p+p and p+Nb reactions measured at a kinetic beam energy of 3.5 GeV with the HADES set-up (GSI, Darmstadt). An overall statistics of 1.2·10⁹ and 4.2·10⁹ events has been collected respectively. A comparison of the measured K_s⁰ transverse momentum spectra from p+p and p+Nb reactions provides information about possible effects caused by the K_s⁰ potential in cold nuclear matter. In particular, the high statistics collected in the low-momentum region down to 30 MeV/c is fundamental to unravel the effects of the potential.
The main steps of the inclusive analysis will be discussed and transverse momentum as well as transverse mass spectra will be presented for both reactions.
[ 1] M.L. Benabderrahmane et al. (FOPI), Phys. Rev. Lett. 102, 182501 (2009)
[ 2] G. Agakishiev et al. (HADES), Phys. Rev. C 82:044907 (2010)