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Bonn, 04. September 2009 Mitglied der Helmholtz-Gemeinschaft Pionic Deuterium | Thomas Strauch for the Pionic Hydrogen collaboration.

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Presentation on theme: "Bonn, 04. September 2009 Mitglied der Helmholtz-Gemeinschaft Pionic Deuterium | Thomas Strauch for the Pionic Hydrogen collaboration."— Presentation transcript:

1 Bonn, 04. September 2009 Mitglied der Helmholtz-Gemeinschaft Pionic Deuterium | Thomas Strauch for the Pionic Hydrogen collaboration

2 Bonn, 04. September 2009Folie 2 Experimental program of the Pionic Hydrogen collaboration Pionic Hydrogen R ECRIT (response function) Muonic Hydrogen Pionic Deuterium R-06.03

3 Bonn, 04. September 2009Folie 3 Exotic atoms Bohr radius:

4 Bonn, 04. September 2009Folie 4 Atomic cascade of pionic deuterium Hadronic interaction shift ε 1s - 2,5 eV width Γ 1s 1,2 eV Aim: 1s / 1s 1s / 1s 3% ~ 1% 12% ~ 4% D(3p - 1s) 3 keV Deser:

5 Bonn, 04. September 2009Folie 5 Pionic Deuterium Width Γ 1s ~ Im a πD directly related to pionproduction at threshold charge symmetry detailed-balance threshold parameter α (s-wave production)

6 Bonn, 04. September 2009Folie 6 Pion-Nucleon Interaction Isospin 1/2 or 3/2 system At threshold: two parameters: s-wave scattering lengths a 1/2 und a 3/2 choose isoscalar und isovector scattering lengths a + und a - :

7 Bonn, 04. September 2009Folie 7 Pionic Hydrogen 1s : + NLO(%) Pionic Deuterium 1s : + NLO(~LO) NLO: a - appears

8 Bonn, 04. September 2009Folie 8 N isospin scattering lengths Constraint for N isospin scattering lengths a & a – J.Gasser et al.: Hadronic atoms in QCD+QED Physics Reports 456(2008) Pionic Deuterium: bandwidth mainly by LEC f1 bandwidth mainly by LEC f1 bandwidth mainly by experiment

9 Bonn, 04. September 2009Folie 9 Experimental setup High-resolution Bragg crystal-spectrometer Bragg law:

10 Bonn, 04. September 2009Folie 10 Experimental setup spherically bent Bragg crystal bending radius ~ 3m cyclotron trap superconducting magnets cryogenic target large area detector 6 CCDs with 600x600 pixel pixelsize 40x40 µm N. Nelms et al., Nucl. Instr. Meth 484 (2002) 419 L. M. Simons, Hyperfine Interactions 81 (1993) 253

11 Bonn, 04. September 2009Folie 11 Experimental setup Precision measurement: low background concrete shielding

12 Bonn, 04. September 2009Folie 12 Measurement ADC-spectrum Cluster analysis Hit pattern on CCD detector Hit pattern after curvature correction

13 Bonn, 04. September 2009Folie 13 high-statistics measurement of πD(3p-1s) Spectrum after cluster analysis, ADC cuts, curvature correction, projection onto x-axis rate: 30/h Measurement pressure / bar number of events 3, ,54800 earlier measurement without concrete with concrete

14 Bonn, 04. September 2009Folie 14 Molecular formation ( d) nl + D 2 [( dd)d]ee radiative deexcitation out of these formations would falsify the extracted shift ε 1s density dependence not seen in H, but predicted to be larger in D

15 Bonn, 04. September 2009Folie 15 Energy calibration Ga K eV K eV reflection in 3rd order Deslattes et al.: X-ray transition energies, Rev. of Mod. Phys., Vol 75, Jan 2003 reflection in 1st order

16 Bonn, 04. September 2009Folie 16 stability with Ga Kα 2 whole measure-time : 4 weeks ΔE ±2,5 meV

17 Bonn, 04. September 2009Folie 17 Results | transition energies corrections: e.g. index of refraction (3keV / 9keV) crystal bending penetration depth… pressure in bar3p-1s transition energy in eV ± ± ± no evidence for radiative de-excitation out of molecular formations ε 1s = E exp. - E QED E QED = ±0.008 eV P.Indelicato private communication

18 Bonn, 04. September 2009Folie 18 Results | shift ε 1s dominant ±0.002 QED calculation ±0.007 pionmass

19 Bonn, 04. September 2009Folie 19 Comparison to earlier measurements

20 Bonn, 04. September 2009Folie 20 Extraction of the hadronic width from the line shape spectrometer response- function Doppler- broadening Lorentzfunction of transition

21 Bonn, 04. September 2009Folie 21 Spectrometer response function (RF) RF = Rocking curve Geometry add. Gauss Energy resolution: ΔE = 436 ± 3 meV ECRIT- measurement with He-likeAr

22 Bonn, 04. September 2009Folie 22 Doppler broadening energy release of Coulomb transitions converted into kinetic energy of the πD-atoms prediction cascade-theory, scaled from πH

23 Bonn, 04. September 2009Folie 23 Doppler broadening kinetic energy distribution: approximation by boxes prediction cascade-theory, scaled from πH

24 Bonn, 04. September 2009Folie 24 χ 2 analysis free fit one boxtwo boxes low energy box essentialno evidence for high energy contribution

25 Bonn, 04. September 2009Folie 25 Statistical studies | MC-simulations intensity input of high energy contribution: 10% : red 25% : blue probability to miss a simulated contribution

26 Bonn, 04. September 2009Folie 26 statistical error determination

27 Bonn, 04. September 2009Folie 27 Results | Width Γ 1s only one Low-energy-component identified, no high-energetic parts numerous MC-simulations to determine systematic errors

28 Bonn, 04. September 2009Folie 28 Comparison to earlier measurements

29 Bonn, 04. September 2009Folie 29 Pionic Deuterium | Final results 1s = meV ( ±3% ±1,3%) 1s = 1171 meV (±12% %) ,1 - 4,2

30 Bonn, 04. September 2009Folie 30 threshold parameter α α = 252 μb χPT: expected uncertainty 30% 5% NNLO calculations

31 Bonn, 04. September 2009Folie 31 Thank you for your attention! Debrecen – Coimbra – Ioannina – Jülich – Paris – PSI – Vienna PSI experiments R and R D. F. Anagnostopoulos, S. Biri, D. D. S. Covita, H. Gorke, D. Gotta, A. Gruber, M. Hennebach, A. Hirtl, P. Indelicato, T. Ishiwatari, Th. Jensen, E.-O. Le Bigot, J. Marton, M. Nekipelov, J. M. F. dos Santos, S. Schlesser, Ph. Schmid, L. M. Simons, Th. Strauch, M. Trassinelli, J. F. C. A. Veloso, J. Zmeskal PIONIC HYDROGEN collaboration

32 Bonn, 04. September 2009Folie 32 Pionisches Deuterium Appendix

33 Bonn, 04. September 2009Folie 33 cascaden effects

34 Bonn, 04. September 2009Folie 34 Origin of shift and width

35 Bonn, 04. September 2009Folie 35 Pionic Deuterium 1s Pionproduktion an der Schwelle NN NN Ladungssymmetrie Zeitumkehr-Invarianz Pionproduktion Parametrisierung: Atom : und über optisches Theorem mit Wirkungsquerschnitt verknüpft Panofsky Rate: P d = 2.83±0.04

36 Bonn, 04. September 2009Folie 36 Elastic scattering

37 Bonn, 04. September 2009Folie 37 Experimental setup

38 Bonn, 04. September 2009Folie 38 long range stability results analysis inclination sensor data evolution of crystal temperature

39 Bonn, 04. September 2009Folie 39 corrections and error for ε 1s

40 Bonn, 04. September 2009Folie 40 Spectrometer responsefunction D. Hitz et al., Rev. Sci. Instr., 71 (2000) 1116 CCD detector He-like atoms narrow X-rays, few keV high rate S H(2p-1s) Cl H(3p-1s) Ar H(4p-1s) D(3p-1s) ECRIT = cyclotron trap (4) + hexapole magnet (2) + high frquency (5) 6.4 GHz 450 W D.F.Anagnostopoulos et al., Nucl. Instr. Meth. B 205 (2003) 9 D.F.Anagnostopoulos et al., Nucl. Instr. Meth. A 545 (2005) 217 Electron Cyclotron Resonance Ion Trap ( ECRIT )

41 Bonn, 04. September 2009Folie 41 Kinetic energy velocity distribution

42 Bonn, 04. September 2009Folie 42 Appendices | NN threshold parameter PT at present / 30% few % charge symmetry detailled balance V. Lensky et al., nucl-th/ ,2005 extrapolation to threshold J. Hüfner, Phys. Rep. 21 (1975) 1 production D atom NLO LO [ b]

43 Bonn, 04. September 2009Folie 43 Formulae D U.-G. Meißner, U. Raha, A. Rusetsky, Phys. Lett.B 639 (2006) Coulomb corrections

44 Bonn, 04. September 2009Folie 44 Deser formula + Coulomb corrections from H 1s from D 1s D wave function Single + multiple scattering d


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