PROBING STRONG INTERACTION WITH SIDDHARTA-2 SMI – STEFAN MEYER INSTITUTE PROBING STRONG INTERACTION WITH SIDDHARTA-2 Johann Zmeskal for the SIDDHARTA-2 Collaboration QNP2018 Nov. 13 -17, 2018 Tsukuba, Ibaraki, Japan WWW.OEAW.AC.AT/SMI

SIDDHARTA-2 Collaboration SIlicon Drift Detector for Hadronic Atom Research by Timing Applications LNF- INFN, Frascati, Italy SMI- ÖAW, Vienna, Austria Politecnico di Milano, Italy RIKEN, Japan Univ. Tokyo, Japan ELPH, Tohoku University, Japan TUM, Munich, Germany Victoria Univ., Canada Univ. Zagreb, Croatia Helmholtz Inst. Mainz, Germany Univ. Jagiellonian Krakow, Poland CERN, Switzerland IFIN – HH, Bucharest, Romania STRONG2020 QNP2018, Tsukuba

DANE – low energy charged kaons Scientific Motivation SMI – STEFAN MEYER INSTITUTE CONTENT DANE – low energy charged kaons Scientific Motivation SIDDHARTA results SIDDHARTA-2 setup QNP2018, Tsukuba WWW.OEAW.AC.AT/SMI

Low energy charged kaons at DANE e+-e- collider LINAC Accu. IR DANE principle operates at the centre-of-mass energy of the  meson mass m = 1019.413 ± .008 MeV width  = 4.43 ± 0.06 MeV  produced via e+e- collision with (e+e- → ) ~ 5 µb   production rate 2.5 x 103 s-1 → monochromatic kaon beam (127 MeV/c) QNP2018, Tsukuba

Motivation exotic hadronic atoms are bound by the Coulomb force e.g. +-, -p, -d, Kp, Kd, … Bohr radii >> as the typical scale of strong interaction observable effects of QCD energy shift  from pure Coulomb value decay width access to scattering at zero energy these scattering lengths are sensitive to chiral and isospin symmetry breaking in QCD can be analysed systematically in the framework of low-energy Effective Field Theory QNP2018, Tsukuba

The scientific goal of SIDDHARTA-2 To perform a first (precision) measurement of kaonic deuterium X-ray transitions observables 1s shift and width kaonic deuterium + kaonic hydrogen will allow to extract the antikaon-nucleon isospin dependent scattering lengths chiral symmetry breaking (mass problem) EOS for neutron stars QNP2018, Tsukuba

Forming “exotic” atoms “normal” hydrogen “exotic” (kaonic) hydrogen K- X-ray n=2 n~25 n=1 n=1 p e- K- 2p → 1s K transition QNP2018, Tsukuba

X-ray transitions to the 1s state QNP2018, Tsukuba

  Scattering lengths Deser-type relation connects shift 1s and width 1s to the real and imaginary part of ɑ K-p (µC reduced mass of the Kp system,  fine-structure constant) U.-G. Meißner, U.Raha, A.Rusetsky, Eur. phys. J. C35 (2004) 349 next-to-leading order, including isospin breaking

SIDDHARTA K-p result ε1s = -283 ± 36(stat) ± 6(syst) eV QNP2018, Tsukuba

Improved constraints on chiral SU(3) dynamics from kaonic hydrogen [Y Improved constraints on chiral SU(3) dynamics from kaonic hydrogen [Y. Ikeda, T. Hyodo and W. Weise, PLB 706 (2011) 63] Real part (left) and imaginary part (right) of the Kp  K p forward scattering amplitude extrapolated to the subthreshold region, deduced from the SIDDHARTA kaonic hydrogen measurement. QNP2018, Tsukuba

SIDDHARTA-2 QNP2018, Tsukuba

veto-2 anti-coincidence SIDDHARTA-2 data taking scheme K+K- pairs produced at DANE triple coincidence veto-2 anti-coincidence SDDs degrader Scintillators data taking scheme veto-2 QNP2018, Tsukuba

SIDDHART-2 new X-ray detector SDD technology with CUBE preamplifier 55Fe spectrum 123.0 eV FWHM CUBE QNP2018, Tsukuba

SIDDHARTA-2 lightweight target cell + SDDs Target cooling: 1 Leybold MD10 – 16 W @ 20 K target cell will be cooled via ultra pure aluminum bars to 30 K max. pressure 0.3 MPa ultra pure Al bars Target cell wall is made of 75 µm Kapton QNP2018, Tsukuba

Cryogenic target – SDDs – veto-2 arrangement Cryo-target QNP2018, Tsukuba

SIDDHARTA-2 Kd X-ray spectrum (MC simulation) INPUT achievable precision: shift: 30 eV width: 75 eV signal: shift - 800 eV width 800 eV density: 5% (LHD) detector area: 246 cm2 K yield: 0.1 % with the yield ratio as in Kp S/B ~ 1 : 4 Khigh QED K K QNP2018, Tsukuba

Physical Review C96 (2017) 045204 arXiv:1705.06857v1 [nucl-th] 19 May 2017 QNP2018, Tsukuba

Theory – SIDDHARTA-2 width [eV] shift [eV] QNP2018, Tsukuba

Summary First kaonic deuterium measurement will allow to determine the antikon-nucleon isospin dependent scattering lengths SIDDHARTA-2 apparatus ready Data taking will start mid of 2019 QNP2018, Tsukuba

Thank you very much for your attention! QNP2018, Tsukuba

Low-energy KN interaction Chiral perturbation theory developed for p,  not applicable for KN systems non-perturbative coupled channels approach based on chiral SU(3) dynamics appropriate framework to analyse the anti-kaon-nucleon system at low energy In light exotic hadronic atoms the Bohr radius is still much larger than the typical range of strong interaction formulated in QCD, and the average momentum of the bound hadron is very small. Chiral perturbation theory (ChPT) [20–22], with symmetries and symmetry breaking patterns of QCD included, is an appropriate framework to analyse the dynamics of hadrons at low energy and to describe the observable effects in the spectrum of exotic hadronic atoms. There are non-perturbative coupled-channel techniques based on the driving terms of the chiral effective Lagrangian which generate the (1405) dynamically as a Kbar-N quasi-bound state and as a resonance in the pi-Sigma channel. They have proved useful and successful. High precision K- p threshold data set important constraints for such theoretical approaches. QNP2018, Tsukuba