Probing Strong Interaction Probing Strong Interaction - the SIDDHARTA experiment the SIDDHARTA experiment by Johann Zmeskal by Johann Zmeskal SMI, Vienna SMI, Vienna PANIC11 PANIC11 PANIC11 PANIC11 The 19 The 19 th th Particle and Nuclei International Conference Particle and Nuclei International Conference July 24 July 24 – 29, 2011 29, 2011 1 PANIC11
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Probing Strong Interaction the SIDDHARTA experimentweb.mit.edu/panic11/talks/monday/PARALLEL-1D/1... · Probing Strong Interaction-the SIDDHARTA experiment by Johann Zmeskal SMI,
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XX‐‐ray transitions to the 1s stateray transitions to the 1s state
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MotivationMotivationExotic (kaonic) atoms – probes for strong interaction
hadronic shift ε1s and width Γ1s directly observableexperimental study of low energy QCD. Testing chiral symmetry breaking in systems with strangeness
Kaonic hydrogen K i l t ti t ith tKp simplest exotic atom with strangenessscattering lengths, no extrapolation to zero energyprecise experimental data important/missingkaonic deuterium never measured beforekaonic deuterium never measured before
Information on Λ(1405) sub‐threshold resonanceresponsible for negative real part of scattering amplitude atresponsible for negative real part of scattering amplitude at thresholdimportant for the search for the controversial „deeply bound kaonic states” (KEK, GSI, DAΦNE, J‐PARC)
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Determination of the isospin dependent KN scattering lengths PANIC11
LowLow‐‐energy Kenergy K‐‐N systemsN systemsChiral perturbation theory, which was developed forπp, ππ is not applicable for K‐N systems
Non‐perturbativeCoupled ChannelsCoupled Channels approach based on
Chiral SU(3) Dynamics
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1D‐2: Jiri MaresPANIC11
Kaonic hydrogen atoms at DAKaonic hydrogen atoms at DAΦΦNENE
e+‐e‐collider
AAccu.
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DADAΦΦNE parametersNE parameters• operates at the centre‐of‐mass energy of the Φmeson
mass m = 1019.413 ± .008 MeVwidth Γ = 4 43 ± 06 MeVwidth Γ 4.43 ± .06 MeV
• produced via e+e‐ collision with( + Φ) 5 bσ(e+e‐ → Φ) ~ 5 μb
• average luminosity L = 5 x 1032 cm‐2 s‐1→Φ production rate 2.5 x 103 s‐1
• Φ decays at rest to about~ 50% K+K‐→monochromatic kaon beam (127 MeV/c)
•• shielding and antishielding and anti‐‐coincidencecoincidence
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Kaonic deuterium Kaonic deuterium –– MC simulationsMC simulationsmodel inputshift = - 660 eVwidth= 1200 eV
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energy [keV]
SIDDHARTA setup was working with 144 SDDsSummarySummary
SIDDHARTA setup was working with 144 SDDs
Kaonic X‐ray spectra measured with several gaseoustargets:K‐p: provided the most precise values (submitted to PLB: arXiv:1105.3090)(submitted to PLB: arXiv:1105.3090)
K‐d: first exploratory measurement small signal (large width)g g
K‐3He: first‐time measurement (PLB 697(2011)199)
K‐4He:measured in gaseous target for the firstK He:measured in gaseous target for the first time (PLB 681(2009)310)
planning for “SIDDHARTA 2”→ improved
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planning for “SIDDHARTA‐2” → improvedtechnique to (re‐)measure K‐d