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Investigating the Conjectured Nucleon Deformation at Low Q2 at the Mainz Microtron

Investigating the Conjectured Nucleon Deformation at Low Q2 at the Mainz Microtron. N.F. Sparveris Department of Physics, University of Athens and Institute of Accelerating Systems and Applications, Athens, Greece for the Mainz N- Δ Collaboration (Athens, MIT, Mainz, RIKEN,

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Investigating the Conjectured Nucleon Deformation at Low Q2 at the Mainz Microtron

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  1. Investigating the Conjectured Nucleon Deformation at Low Q2 at the Mainz Microtron N.F. Sparveris Department of Physics, University of Athens and Institute of Accelerating Systems and Applications, Athens, Greece for the Mainz N-ΔCollaboration (Athens, MIT, Mainz, RIKEN, U. Kentucky, U.Zagreb, U. Ljubljiana) Electromagnetic Interactions with Nucleons and Nuclei Milos, September 2005

  2. Overview Objective: Measure with high precision EMR and CMR Ratios Investigate the role of the pion cloud at the low Q2 region Mainz Measurements: Η(e,e’p)πomeasurements at low Q2 region (0.06 – 0.20 (GeV/c)2) 855 MeV polarized electron beam High precision measurements involving in- and out of - plane detection Experiment performed in 2 stages (spring 2003 & fall 2003) Observables: cross sections extract: responses(LT, TT, LT’, L+T)quadrupole strengths (CMR and EMR) Preliminary results for the responsesand the quadrupole amplitudes will be presented

  3. p(qqq) I = J = 938 MeV γ* Μ1, Ε2, C2 Μ1+ ,Ε1+,S1+πo d u u d u u Ν  Δ(1232) Δ(qqq) I = J = 1232 MeV Spherical  M1 Deformed  M1 , E2 , C2 Deformation signal

  4. p p0 Extracting the response functions cross section measurements at various azimouthal angles Η(e,e’p)πo

  5. Response functions … precise Response measurements … and extensive mapping versus θ

  6. Ν  Δ program @ Mainz “Mainz ΝΔ collaboration” (IASA (Athens), MIT,, Mainz..) Focus on the low Q2 region in an attempt to understand the effect of the mesonic cloud on the responses CW beam Maximum Ebeam = 855 MeV Maximum Ibeam = 25 μA Spectrometer A detecting electrons (in plane) sequential measurements: Spectrometer B detecting protons (can go up to 10o out of plane) Spectrometer C detecting electrons (luminosity monitor)

  7. Mainz Ν  Δ measurements

  8. Phase space sequential measurements

  9. Results: Q2 = 0.06 (GeV/c)2 (Mainz) (Bates)

  10. PRELIMINARY Results: Q2 = 0.06 (GeV/c)2 S.Stave PhD

  11. Results: Q2 = 0.20 (GeV/c)2

  12. Results: Q2 = 0.127 (GeV/c)2 PRELIMINARY

  13. Latest Compilation of Bates Data @ Q2 = 0.127 (GeV/c)2

  14. CMR

  15. EMR

  16. M 1+

  17. Conclusions & outlook • Results at all Mainz Q2 points will be finalized this year. Precise values for the quadrupole strengths will be extracted at Q2=0.06 (GeV/c)2 and 0.20 (GeV/c)2 • The LT’ results at Q2=0.127 (GeV/c)2 are expected to enrich the world data base at this Q2. Provide more constrains to background amplitudes at this Q2. • Preliminary results indicate CMR around (-5 ± 0.5) % for both the Q2=0.06 GeV2 & 0.20 GeV2 • The CMR and EMR results at Q2=0.06 (GeV/c)2 and 0.20 (GeV/c)2 will be evaluated along with the corresponding values at Q2=0.127 (GeV/c)2(Bates/Mainz) in order to understand the Q2 dependence of the quadrupole strengths at the low Q2 region.

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