Abstract
The pp → ppK + K − reaction was measured near threshold at excess energy Q = 4.5 MeV using the COSY-11 detection system installed at the COSY-Juelich accelerator. Preliminary value of upper limit of the total cross section was determined. This limit indicates that an enhancement of the total cross section close to the threshold, caused by the final state interaction, is smaller than suggested by extrapolation of data measured at higher energies.
Highlights
The energy dependence of the pp → ppK+K− total cross section close to threshold is very sensitive to the interactions between particles in the final state, and is well suited for studies of these interactions
The existing data for the kaon pair production in pp collisions were measured for excess energies higher than Q = 6 MeV, with exception of one point at 3 MeV, for which only upper limit of the total cross section was determined
The COSY-11 acceptance for the ppK+K− events, determined using Monte Carlo simulations taking into account the pp-final state interaction (FSI), is equal to 2.83%
Summary
The energy dependence of the pp → ppK+K− total cross section close to threshold is very sensitive to the interactions between particles in the final state, and is well suited for studies of these interactions. There are some astrophysical aspects of studying kaons production reactions, like description of neutron stars structure [4]. The existing data for the kaon pair production in pp collisions were measured for excess energies higher than Q = 6 MeV, with exception of one point at 3 MeV, for which only upper limit of the total cross section was determined. Data very close to threshold (for Q < 6 MeV) are crucial for distinguishing between various models of the final state interaction (FSI) in the ppK+K− system.
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