Future projects of light kaonic atom X-ray spectroscopy

H Tatsuno,P Levi Sandri,T Ishiwatari,M Iwasaki,E Sbardella,A Romero Vidal,K Piscicchia,D Pietreanu,M Iliescu,F Ghio,C Guaraldo,A D’uffizi ,Arslan Dawood Butt ,A Scordo ,G Beer ,C Berucci ,D Bosnar ,R Hayano ,E Widmann ,D Sirghi ,A M Bragadireanu ,Giovanni Bellotti ,C Curceanu ,F Sirghi ,J Márton ,H C Shi ,M Cargnelli ,S Okada ,C Fiorini ,O Vázquez Doce ,M Bazzi ,J Zmeskal

doi:10.1051/epjconf/201613001018

Abstract

X-ray spectroscopy of light kaonic atoms is a unique tool to provide precise information on the fundamental KN interaction at the low-energy limit and the in-medium nuclear interaction of K-. The future experiments of kaonic deuterium strong-interaction shift and width (SIDDHARTA-2 and J-PARC E57) can extract the isospin dependent K-N interaction at threshold. The high-resolution X-ray spectroscopy of kaonic helium with microcalorimeters (J-PARC E62) has the possibility to solve the long-standing potential-strength problem of the attractive K--nucleus interaction. Here, the recent experimental results and the future projects of X-ray spectroscopy of light kaonic atoms are presented.

Highlights

Symmetry breaking due to the relatively heavier strange quark and the dynamics of low-energy QCD in the strangeness sector
A chiral SU(3) calculation which is based on the experimental data of the K N interaction can describe the experimental data of shifts and widths and predict the relatively shallow potential depth (Re(V0) ∼ −50 MeV) [7]
We present here the key experiments and the future projects of light kaonic atom X-ray spectroscopy: 1. past and recent results of kaonic hydrogen 2p → 1s X-ray measurement by KEK-PS E228 [8], DEAR [9], and SIDDHARTA [10], 2. first measurement of kaonic deuterium 2p → 1s X-rays planned by the SIDDHARTA-2 [11] and the J-PARC E57 [12] groups, 3. high-resolution x-ray spectroscopy of kaonic helium-3 and helium-4 with superconducting transition-edge-sensors (TESs) by the HEATES and J-PARC E62 groups [13], which can solve the deep-or-shallow problem on the K−-nucleus potential depth

Summary

Introduction

The precise study of the K N strong interaction has started from X-ray spectroscopy of kaonic atoms. The 1s-state strong-interaction shifts and widths of kaonic hydrogen (K−-p) and kaonic deuterium (K−-d) can be used to directly extract the isospin dependent K−N interaction at threshold by the Deser-Trueman type formula [1] They are necessary for precise calculations of chiral SU(3) meson-baryon effective-field theory in low-energy QCD. A chiral SU(3) calculation which is based on the experimental data of the K N interaction can describe the experimental data of shifts and widths and predict the relatively shallow potential depth (Re(V0) ∼ −50 MeV) [7] This quantitative disagreement, so-called ‘deep-or-shallow problem’ is fundamentally correlated to the characteristic and structure of the K− multi-nucleon cluster states. We present here the key experiments and the future projects of light kaonic atom X-ray spectroscopy: 1. past and recent results of kaonic hydrogen 2p → 1s X-ray measurement by KEK-PS E228 [8], DEAR [9], and SIDDHARTA [10], 2. first measurement of kaonic deuterium 2p → 1s X-rays planned by the SIDDHARTA-2 [11] and the J-PARC E57 [12] groups, 3. high-resolution x-ray spectroscopy of kaonic helium-3 and helium-4 with superconducting transition-edge-sensors (TESs) by the HEATES and J-PARC E62 groups [13], which can solve the deep-or-shallow problem on the K−-nucleus potential depth

Kaonic hydrogen

Kaonic deuterium

Kaonic helium

Summary