K⁺-nucleon amplitudes in the medium below 800 MeV/c

Abstract

Abstract. Simple in-medium meson-nucleon kinematics has been applied recently in calculations of strong interaction effects in kaonic atoms, pionic atoms and elastic scattering of low energy pions by nuclei. More sensitive tests of this approach are possible with K + -nucleus interactions below 800 MeV/c because of the superior penetration of kaons into nuclei. The energy dependence of calculated reaction and total cross sections for K + on 6 Li, C, Si and Ca agrees better with experiment when this approach is used. Calculated absolute scales are in full agreement with experiment for the very low density nucleus 6 Li whereas calculations are 23±4 % too low for C, Si and Ca, thus quantifying phenomenologically the enhancement in the nuclear medium observed before.

Production spectra with a Σ− hyperon in (π−,K+) reactions on light to heavy nuclei

“…Figure 5 shows the calculated angular distributions for the K + elastic scatterings on 12 C at p lab = 715 and 800 MeV/c. It has been known [45][46][47] that the K + scattering data are not well reproduced by the tρ-type potential using a Fermiaveraged K + N amplitude b (KN ) 0 based on the results from SAID [42]. We confirm that the calculated angular distributions are obviously underestimated in comparison with the data.…”

“…We confirm that the potentials having a repulsion inside the nuclear surface and an attraction outside the nucleus with a sizable absorption reproduce sufficiently the data of the − atomic x-ray and the (π − , K + ) reactions on the light-to-heavy targets, regardless of the different geometries among their potentials. Such nuclear (π − , K + ) reactions may be among the most promising tools for studying wave functions for K + inside a nucleus in order to settle the long-standing problem of K + in the nuclear medium [47]. More microscopic calculations for the -nucleus potentials based on the modern Y N potentials are also needed for understanding Y N and Y NN interactions.…”

“…To see the sensitivity of the spectra to the K + -nucleus optical potential, here, we estimate the integrated cross sections σ ( 28 Si) for DD-A at p lab = 1.2 GeV/c. Because of the mysterious K + behavior in nuclear medium [45][46][47], the parameters for K + remain to be determined in a standard Kisslinger or tρ-type potential. We consider the following three different parameters: b 0 and c 0 obtained by fits to the data of the K + elastic scatterings on 12 C in this work (set A); b 0 = −6.2 × 10 −4 p K + i 90/p K (fm 3 ) that well reproduces the same data [25] (set B); b (KN ) 0 obtained by the Fermiaveraged K + N amplitudes based on the results from SAID [42], as seen in Fig.…”

K +–nucleus elastic scattering revisited from the perspective of partial restoration of chiral symmetry

“…The recent studies using the optical potential based on the in-medium kinematics were done in Ref. [17,18].…”