تقرير
Medium effects in antikaon-induced $\Xi^-$ hyperon production on nuclei near threshold
| العنوان: | Medium effects in antikaon-induced $\Xi^-$ hyperon production on nuclei near threshold |
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| المؤلفون: | Paryev, E. Ya. |
| المصدر: | Nucl.Phys.A 1013(2021)122222 |
| سنة النشر: | 2021 |
| المجموعة: | High Energy Physics - Phenomenology Nuclear Experiment Nuclear Theory |
| مصطلحات موضوعية: | Nuclear Theory, High Energy Physics - Phenomenology, Nuclear Experiment |
| الوصف: | We study the antikaon-induced inclusive cascade $\Xi^-$ hyperon production from $^{12}$C and $^{184}$W target nuclei near threshold within a nuclear spectral function approach. The approach describes incoherent direct $\Xi^-$ hyperon production in elementary ${K^-}p \to {K^+}\Xi^-$ and ${K^-}n \to {K^0}\Xi^-$ processes as well as takes into account the influence of the scalar nuclear $K^-$, $K^+$, $K^0$, $\Xi^-$ and their Coulomb potentials on these processes. We calculate the absolute differential and total cross sections for the production of $\Xi^-$ hyperons off these nuclei at laboratory angles $\le$ 45$^{\circ}$ by $K^-$ mesons with momenta of 1.0 and 1.3 GeV/c, which are close to the threshold momentum (1.05 GeV/c) for $\Xi^-$ hyperon production on the free target nucleon at rest. We also calculate the momentum dependence of the transparency ratio for the $^{184}$W/$^{12}$C combination for $\Xi^-$ hyperons at these $K^-$ beam momenta. We show that the $\Xi^-$ differential and total (absolute and relative) production cross sections at the considered initial momenta reveal a distinct sensitivity to the variations in the scalar $\Xi^-$ nuclear potential at saturation density $\rho_0$, studied in the paper, in the low-momentum region of 0.1--0.6 GeV/c. We also demonstrate that for the subthreshold $K^-$ meson momentum of 1.0 GeV/c there is a strong sensitivity of the transparency ratio for $\Xi^-$ hyperons to the considered changes in the $\Xi^-$ nuclear potential at all outgoing $\Xi^-$ momenta as well. Therefore, the measurement of these absolute and relative observables in a dedicated experiment at the J-PARC will provide valuable information on the $\Xi^-$ in-medium properties, which will be complementary to that deduced from the study of the inclusive ($K^-$,$K^+$) reactions at incident momenta of 1.6--1.8 GeV/c in the $\Xi^-$ bound and quasi-free regions. Comment: 31 pages. arXiv admin note: text overlap with arXiv:2102.00789 |
| نوع الوثيقة: | Working Paper |
| DOI: | 10.1016/j.nuclphysa.2021.122222 |
| URL الوصول: | http://arxiv.org/abs/2106.00353 |
| رقم الأكسشن: | edsarx.2106.00353 |
| قاعدة البيانات: | arXiv |
| DOI: | 10.1016/j.nuclphysa.2021.122222 |
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