Allows to address central question: “ What are the relevant degrees-of-freedom at varying distance scale ?” N π,  B=N,N,  q q q e e'  e.

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Presentation transcript:

Allows to address central question: “ What are the relevant degrees-of-freedom at varying distance scale ?” N π,  B=N,N*,  * q q q e e' ** e ** e **

p ** N  N*  photocoupling amplitudes → A 1/2, A 3/2 and S 1/2 → A 1/2, A 3/2 and S 1/2  Pion electroproduction multipole amplitude → E l , M l  and S l . l : the orbital angular momentum in Nπ system. ± sign : spin of proton couples to the orbital momentum. E l , M l ,S l  A 1/2, A 3/2,S 1/2 S z = 1 S z = 0 S 1/2 S z = 1/2

* Publication includes analyses of N  channels

 one photon exchange approximation

 E 0 =5.499 GeV  Luminosity ~20 fb -1 Kinematic binning ~ 29K cross-section data VariableRangeNumber of bin (size) W 1.6 ~2.0 GeV5(40MeV), 3(60MeV) Q2Q2 1.7 ~4.5 GeV 2 5 (vary) cos    -1.0~+0.5, +0.5~+1.07 (0.2), 10 (0.05)  0  ~ 360  24 (15  ), 48(7.5  )

Exp. e1-f A + B cos  + C cos2  Overall systematic uncertainty is 9-10%

cosine bins fine cosine bins at forward angle

Exp. e1-f DMT MAID2003 MAID2007

Exp. e1-f (  W= 20MeV) Exp. e1-f ( Sys. Err. ) PRC 77, (2008) Exp. e1-f (  W= 40MeV)

This analysis, I.G. Azauryan (UIM & DR) RPP (PDG) Phys. Rev. D 86 (2012) I.G. Aznauryan, Phys. Rev. C 72 (2005) Z. Lee and F. Close (1990) M. Dugger Phys. Rev. C 76 (2007) M.M. Gianini/E. Santopinto (hQCM) D. Merten, U. Loring, et al., (2003) V. I. Mokkev, I.G. Aznauryan, arXiv (2013)

This analysis, I.G. Azauryan (UIM & DR) RPP (PDG) Phys. Rev. D 86 (2012) I.G. Aznauryan, Phys. Rev. C 72 (2005) Z. Lee and F. Close (1990) M.M. Gianini/E. Santopinto (hQCM) D. Merten, U. Loring, et al., (2003)

This analysis, I.G. Azauryan (UIM & DR) RPP (PDG) Phys. Rev. D 86 (2012) B. Julia-Diaz, T.-S.H. Lee, A. Matsuyama, et al., (2008) M. Dugger Phys. Rev. C 76 (2007) M.M. Gianini/E. Santopinto (hQCM) D. Merten, U. Loring, et al., (2003)

This analysis, I.G. Azauryan (UIM & DR) RPP (PDG) included A. Anisovich (BONN, PNPI), EPJ A48 15 (2012) M.M. Gianini/E. Santopinto (hQCM)

 Using the exclusive single positively charged pion off the proton data, the differential cross sections have been measured for high-lying resonances. (1.6 GeV< W< 2.0 GeV, 1.7 GeV 2 < Q 2 < 4.5 GeV 2 ).  Preliminary results are consistent with the published data.  Angular distribution at high W likely indicate the pion pole contribution.  Preliminary helicity-amplitudes for F 15 (1680 ), D 15 (1675), P 11 (1710) resonances have been extracted using a UIM and DR.  Combined analysis of available and future data on all exclusive meson electroproduction channels at W >1.6 GeV and at Q 2 >2.0 GeV 2 within the framework of coupled channel approaches will improve considerably our knowledge on high mass N*-state electro-couplings.

Questions/comments ? Thank you for your attention

This analysis Total from UIM PRC 77, (2008) Switch off  (1600)P 33 and N(1720)P 13 from the UIM Switch off N(1680)F 15 from the UIM Switch off  (1620)S 31 and N(1650)S 11 from the UIM Switch off all third resonances from the UIM Q 2 =1.8GeV 2 Q 2 =3.15GeV 2

MAID 2007 (global fit) RPP (PDG) J. Phys. G 37 (2010) I.G. Aznauryan, Phys. Rev. C 72 (2005)