2. Probe resolution (GeV) N π,  Q 2 =12 GeV 2 Q 2 =6 GeV 2 The study of nucleon resonance transitions provides a testing ground for our understanding of these effective D.o.F B=N,N*,  * Access to the essence of non- perturbative strong interactions generation of > 97% of nucleon mass enhance capability to map out QCD  function in constituent regime

3. D 13 (1520) S 11 (1535) P 33 (1232) P 11 (1440) * Study of transition from ground state allows make more definite statement about the nature Missing States? Energy Orbital angular momentum * There are questions about underlying degrees-of-freedom of some well known state like P11, S11, D13

4. 4 p(e,e')X p(e,e'p)   p(e,e'  + )n p(e,e'p  + )  -   channel is sensitive to N*s heavier than 1.4 GeV  Provides information that is complementary to the N  channel  Many higher-lying N*s decay preferentially into N  final states Q 2 < 4.0 GeV 2 W in GeV

5.  Study of Resonance to understand Nucleon Structure  Extensive studies beyond Δ(1232), P11(1440), S11(1535), D13(1520) using pπ + channels  Currently pπ 0, p  2π ’s channels are underway PRC 77, 015208 (2008) PRC 78, 045204 (2008) PRC 78, 045209 (2008)PRC 80, 055203 (2009) PRL 97, 112003 (2006) PRC 73, 025204 (2006)

6. 6 The structure of the nucleon and its excited states are much more complex than CQM Constituent Counting Rule at high Q 2 pQCD has some limits

7. 7 The structure of the nucleon and its excited states are much more complex than CQM Constituent Counting Rule at high Q 2 pQCD has some limits Lattice QCD (LQCD) Dynamical Chiral Symmetry Breaking (CSB) Light Cone Sum Rule (LCSR)

8. 29, 30: Dalton and Denizli 31: compilation by Stoler 32: Aznauryan analysys of e1-6 CLAS data 33: Old data by Tiator ProtonS 11 Transition Form Factor  Distribution Amplitudes DA from Lattice QCD (Warkentin, Braun) Braun et al. Phys.Rev.Lett.103:072001,2009

9. Exp. e1-6a with G n M measurement from CLAS Exp. e1-6a with G n M from parametrization E 0+ /G D : LCSR ( experimental electromagnetic form factors as input) E 0+ /G D : pure LCSR calculation E 0+ /G D : MAID2007

10.  Apr. 04 ~ Jul. 26, 2006  E0 =5.499GeV (pol. e), LH2 target  target position = 25cm upstream  Length = 5cm, Φ = 6mm  I B = 2250A  Trigger = EC in x EC tot x CC  Total number of runs = 608 (576 Golden runs)

11. Single pion electroproduction Unpol. Xsection w/ one-photon exchange approx.

14. * AAO_RAD for electro-production : modification input parameters.. Kinematic settings E0E0 5.499 GeV. W1.4-2.0GeV Q2Q2 1.5-5.0GeV 2 Target position-27.5, -22.5, 0.2 20M basis 634M basis  ExcluRad basis exact calculation  Limited W<2.0GeV, Q2<5.0GeV2  two MAID (03/07) version tested  2 or 3times iteration  Using final kinematic binning  20%

15.  Fit the background using exp + polynomial function for high mass region  extrapolate under neutron missing mass region  BG study using the final binning BEFORE BG subtraction AFTER BG subtraction

16.  Luminosity & virtual photon flux were taken in account Exp. e1-f

17. DMT2001 (Dynamic model) MAID 2003 (Isobar model) MAID 2007 (Isobar model)

18. Overall systematic error in the analysis of “ e1f ” data is approximately ~10 -20% DMT2001 (Dynamic model) Exp. e1-f Exp. e1-6a MAID 2003 (Isobar model) MAID 2007 (Isobar model)

19. Exp. e1-f

21.  Single charged pion differential cross sections have been extracted in high lying resonance region (1.6<W<2.0GeV) using CLAS e1-f data set.  Preliminary results showed consistent with e1-6 data at 1.60GeV<W<1.69GeV.  These single pion and upcoming double-pion data allow us to study extensively for high-lying resonances.  Stay tune to finalize data and look forward to extract helicity amplitudes for high resonances.

23. JLAB, Carnegie Mellon Univ. of Maryland Trinity College (Dublin) m=578 MeV m=416 MeV radial excitations to calculate form factors, and signal-to-noise extraction New Techniques: Anisotropic Lattices 3 flavors of quarks Proton – P11 form fact Proton Roper Form Factors Huey-Wen Lin

24. data: unquenched LQCD curves: DSE calculation N   transition form factor We can use high precision measurement of nucleon-resonance transition form factors to chart the momentum evolution of the dressed-quark mass

25. 29, 30: Dalton and Denizli 31: Brasse parameterization 32: Aznauryan analysys of e1-6 CLAS data ProtonS 11

26.  Select only two empty target runs  Applying beam-enrgy correction  Using target EXIT window (15[μm] of "Al" foil) as a z- vertex as function of momentum

27.  β cut, fiducial cut vs. momentum  3 σ cut was used for pion PID on β.

28.  β cut, fiducial cut vs. momentum  3 σ cut was used for pion PID on β.

29.  Comparison of EC geometry in term of EC coordinate frame between before(black) and after(red) electron fiducial cut.  Electron fiducial cut  Efficiency  EC geomertry cut

35. +1.4%

39. * AAO_RAD for electro-production : modification input parameters. * Approx. ~800M events were generated. Kinematic settings E0E0 5.499 GeV. W1.4-1.6GeV Q2Q2 1.5-5.0GeV 2 targetProton Target position-27.5, -22.5, 0.2 Q 2 power2.0 f(Q 2 ) = 1./x**nq2 t-slope0.3 f(t)=exp(-x*abs(t_slop)) Levon : modifying target scattering chamber optimized flags Levon : modifying “USER_ANA” Supporting Web Docs Simulation History Supporting Web Docs Acceptances Supporting Web Docs Technical Note

40. * FSGEN for electro-production : modification input parameters. * Approx. ~1B events were generated. Kinematic settings E0E0 5.499 GeV. W0.9-3.2GeV Q2Q2 1.0-4.0GeV 2 targetProton Target position-27.5, -22.5, 0.2 Q 2 power2.0 f(Q 2 ) = 1./x**nq2 t-slope0.3 f(t)=exp(-x*abs(t_slop)) Levon : modifying target scattering chamber optimized flags Levon : modifying “USER_ANA”

41. Levon : modifying target scattering chamber optimized flags Levon : modifying “USER_ANA”

42.  Running same analysis code with MC  Reconstructed/Generated events Supporting Web Docs Acceptances 20M basis 634M basis

43. * AAO_RAD for electro-production : modification input parameters.. Kinematic settings E0E0 5.499 GeV. W1.4-2.0GeV Q2Q2 1.5-5.0GeV 2 TargetProton Target position-27.5, -22.5, 0.2 Levon : modifying target scattering chamber optimized flags Levon : modifying “USER_ANA” 20M basis 634M basis

44.  Luminosity & virtual photon flux were taken in account Exp. e1-f Exp. e1-6a

45. Supporting Web Docs Comparison with models MAID 2003 (Isobar model) MAID 2007 (Isobar model) DMT2001 (Dynamic model) Exp. e1-f Exp. e1-6a

46. Supporting Web Docs Comparison with models MAID 2003 (Isobar model) MAID 2007 (Isobar model) DMT2001 (Dynamic model) Exp. e1-f

47. Supporting Web Docs Comparison with models MAID 2003 (Isobar model) MAID 2007 (Isobar model) DMT2001 (Dynamic model) Exp. e1-f

48. Supporting Web Docs Comparison with models MAID 2003 (Isobar model) MAID 2007 (Isobar model) DMT2001 (Dynamic model) Exp. e1-f

49. Supporting Web Docs Comparison with models MAID 2003 (Isobar model) MAID 2007 (Isobar model) DMT2001 (Dynamic model) Exp. e1-f

50. Supporting Web Docs Comparison with models MAID 2003 (Isobar model) MAID 2007 (Isobar model) DMT2001 (Dynamic model) Exp. e1-f

51. Supporting Web Docs Comparison with models MAID 2003 (Isobar model) MAID 2007 (Isobar model) DMT2001 (Dynamic model) Exp. e1-f

52. Supporting Web Docs Comparison with models MAID 2003 (Isobar model) MAID 2007 (Isobar model) DMT2001 (Dynamic model) Exp. e1-f

53. Supporting Web Docs Comparison with models MAID 2003 (Isobar model) MAID 2007 (Isobar model) DMT2001 (Dynamic model) Exp. e1-f

54. NEAR THRESHOLD PHYSICS

55. Supporting Web Docs Fitting with min.acc.cuts

56. Supporting Web Docs Exp. using 12 bin of phi Exp. using 6 bin of phi in large angle

57. Supporting Web Docs Exp. using 12 bin of phi Exp. using 6 bin of phi in large angle

58. Even as we speak, we need to fully understand:  the essential nature of quark confinement.  the dynamics of quark-gluon interaction at low energy A Quest for Understanding Nature Challenge: Understanding the role of quarks and gluon in nuclei How to address and solve this: Step into the domain of relativistic quantum field theory where the key phenomena can only be understood with non-perturbative methods