1. HLAB meeting 論文紹介 18/Oct/2011 Toshi Gogami

2. Title

3. Abstract

4. X-ray spectroscopy of kaonic atoms An accurate determination of the K-N iso-spin dependent scattering length  Strong constrains on the low-energy K-N dynamics ( S.Deser et al., Phys. Rev. 98(1954)774 ) Nuclear absorption Width Γ 1s Shift ΔE 1s Strong interaction 2p 1s 2p-1s X-ray (~6 KeV) Kaonic hydrogen 1s (only coulomb)

5. Results of KH from the past experiments (1)Davies et al. 1979 (2)Bird et al. 1983 (3)Izycki et al. 1980 Repulsive Attractive Progress in Particle and Nuclear Physics 61 (2008) 512-550 p K-K-

6. Experimental setup φ K+K+ K-K- Gaseous target X-ray e+e+ e-e- Nuclear Instruments and Methods in PRA 581 (2007)326-329

10. What are differences ? KpX, 1998DEAR, 2005SIDDHARTA DetectorSi(Li)CCDSDD Energy resolution [eV] (FWHM) 360180150 ThicknessSub 10 mmSub mm Effective area [cm 2 ]120116114 Time resolutionSub μs~ 30 secSub μs Effciency @ 6 [keV]~ 100%~ 60%~ 100%

11. Time gate K- K+ coincidence time WRT RF signal (~368MHz) K- K+ coin & x-ray

12. Result of the KH Γ 1s = 541 ± 89(stat.) ± 22(sys.) [eV] ΔE 1s = −283 ± 36(stat.) ± 6(sys.) [eV] arXiv:1105.3090v2 (2011) 9/Aug

13. Result of the KH arXiv:1105.3090v2 (2011) Γ 1s = 541 ± 89(stat.) ± 22(sys.) [eV] ΔE 1s = −283 ± 36(stat.) ± 6(sys.) [eV]

14. Kaonic He puzzle KEK-PS E570 – 6467±2(stat.)±2(sys.) [eV] – ΔE 2p = 2±2(stat.)±2(sys.) [eV] 8 SSDs, 1 months Theories PLB 653 (2007) 387-391

15. Results of Kaonic He 数値 144 SSDs, a few days Shift [eV]Publication KEK E570K 4 He+2±2(stat.)±2(sys.)PLB 653(2007)387 SIDDHARTAK 4 He (a part of dataset)+0±6(stat.)±2(sys.)PLB 681(2009)310 K 4 He (increased statistics)+5±3(stat.)±4(sys.) Preliminary (PLB 697(2011)199) K 3 He-2±2(stat.)±4(sys.)PLB 697 (2011)199 Kaonic Helium4 Kaonic Helium3

16. Results of Kaonic He 数値 144 SSDs, a few days Shift [eV]Publication KEK E570K 4 He+2±2(stat.)±2(sys.)PLB 653(2007)387 SIDDHARTAK 4 He (a part of dataset)+0±6(stat.)±2(sys.)PLB 681(2009)310 K 4 He (increased statistics)+5±3(stat.)±4(sys.) Preliminary (PLB 697(2011)199) K 3 He-2±2(stat.)±4(sys.)PLB 697 (2011)199 Kaonic Helium4 Kaonic Helium3 SIDDHARTA KEK E570

17. Summary K-p ( arXiv:1105.3090v2 (2011) ) – Γ 1s = 541 ± 89(stat.) ± 22(sys.) [eV] – ΔE 1s = −283 ± 36(stat.) ± 6(sys.) [eV] K- 3 He – The first time measurement (PLB 697 (2011)199) – -2±2(stat.)±4(sys.) K- 4 He – PLB 681(2009)310 – +0±6(stat.)±2(sys.) K-d – The first exploratory measurement SIDDHARTA-2 Collaboration, Proposal of Laboratori Nazionali di Frascati of INFN, The upgrade of the SIDDHARTA apparatus for an enriched scientific case (2010). SIDDHARTA-2