1. Report on the triple coincidence analysis Eli Piasetzky for Igor Korover Collaboration meeting Jlab 17June 2013 triple /double ratios: Triple coincidence ratios: MM distributions Pcm distributions

2. Isospin 1 states Isospin 0 states Explanation lies in the dominance of the tensor part in the NN interaction M.S, Abrahamyan, Frankfurt,Strikman PRC,2005 Adapted from Sargasian talk Jlab., June 2013

3. In plan angle ±4°Out of plan angle ±14° Nominal acceptance cuts 750 MeV/c

4. In plan angle ±4°Out of plan angle ±14° Nominal acceptance cuts 625 MeV/c

5. In plan angle ±4°Out of plan angle ±14° Nominal acceptance cuts 500 MeV/c

6. Report on the triple coincidence analysis triple /double ratios:

7. Triple / double coincidence ratios The main challenge is to correct for the finite angular and momentum acceptances of the recoil detectors: BigBite for the protons, HAND for the neutrons. The method (Following Ran’s analysis): # Assume that the shape of the CM momentum distribution is known and fit the triple coincidence data to get the best parameters (and estimate of their uncertainty). # simulate the recoil nucleon for each (e,e’p) event assuming 2N_SRC and the known CM motion. # check what fraction of the recoil nucleons are being detected.

8. p e e’ p Pmiss P recoil 48 0 20.3 0 -33.5-24.5 0 p/n We assumed : PCM (x direction) dist G(σ x,0) PCM (y direction) dist G(σ y,0) PCM (z direction) dist G(σ z,z 0 ) Ran assumed: -92,-97 0

9. “C.M. Momentum Distribution” X Y z 4 He(e,e’pn) 750 MeV/c Notice that Pcm* is not the cm momentum of the pair: FSI, not relevant for the extrapolation. Finite acceptance – need to be corrected by simulation In plan angle ±4° Out of plan angle ±14° TOF 30-60 ns (~900-300 MeV/c) Nominal acceptance cuts

10. “C.M. Momentum Distribution” 4 He(e,e’pn) 750 MeV/c No TOF cut In plan angle ±4° Out of plan angle ±14° TOF 30-60 ns (~900-300 MeV/c) Nominal acceptance cuts

11. “C.M. Momentum Distribution” 4 He(e,e’pn) 750 MeV/c No TOF cut In plan angle ±4° Out of plan angle ±14° TOF 30-60 ns (~900-300 MeV/c) Nominal acceptance cuts

12. “C.M. Momentum Distribution” 4 He(e,e’pn) 500 MeV/c XY z 4 He(e,e’pn) 625MeV/c X Y z

13. “C.M. Momentum Distribution” 750 MeV/c 625 MeV/c 500 MeV/c

14. “C.M. Momentum Distribution” 750 MeV/c 500 MeV/c 625 MeV/c

15. “C.M. Momentum Distribution” 750 MeV/c 500 MeV/c 625 MeV/c

16. “C.M. Momentum Distribution” 4 He(e,e’pn) For acceptance correction to the 4 He data we assumed: To be compared with 136±20 MeV/C for 12 C Pmiss=300-500MeV/c, Ran analysis. 160-180 MeV/c Or analysis, hall B data summary X XX

17. How well this assumption described the data ? 750 MeV/c 625MeV/c 500 MeV/c

18. How well this assumption described the data ? 750 MeV/c 80 MeV/c 100 MeV/c 120 MeV/c We plan to do Х 2 analysis

19. How well this assumption described the data ? 625MeV/c 80 MeV/c 100 MeV/c 120 MeV/c We plan to do Х 2 analysis

20. Acceptance correction factor? 500 MeV/c 625MeV/c 750 MeV/c 5.65 1.24 4.57 1.0 3.74 0.81 750 MeV/c 625 MeV/c500 MeV/c 7.34 1.22 6.02 1.0 4.96 0.82 12.0 1.27 9.44 1.0 7.48 0.79 These are for ω<0.97 Analysis was done for ω<0.95

21. Event selection (e,e’p) 500 MeV/c X>1.05 M=0.94 X>1.05 ω<0.95 X>1.05 M+m π Peter analysis ω<0.95 X>1.05

22. Event selection (e,e’p) 625 MeV/c Peter analysis M=0.94 X>1.05 ω<0.95 M+m π X>1.05 ω<0.95 X>1.05

23. Event selection (e,e’p) 750 MeV/c Peter analysis M=0.94 X>1.05 ω<0.95 M+m π X>1.05 ω<0.95 X>1.05

24. Event selection (e,e’p) Need to add cut sensitivity analysis

25. (e,e’pn) / (e,e’p) In plan angle ±4° Out of plan angle ±14° TOF 30-60 ns (~900-300 MeV/c) Nominal acceptance cuts 96 ± 23 % 500 MeV/c 625MeV/c 750 MeV/c Statistical uncertainties only (Max) total uncertainties 20% overall normalization uncertainty

26. (e,e’pp) / (e,e’p) In plan angle ±4° Out of plan angle ±14° TOF 30-60 ns (~900-300 MeV/c) Nominal acceptance cuts 9.5 ± 2 % Statistical uncertainties only 625MeV/c 750 MeV/c total uncertainty

27. [(e,e’pn) +(e,e’pp)] / (e,e’p) In plan angle ±4° Out of plan angle ±14° TOF 30-60 ns (~900-300 MeV/c) Nominal acceptance cuts 500 MeV/c 625MeV/c 750 MeV/c Assuming 10% (e,e’pp) Statistical uncertainties only

28. (e,e’pn), (e,e’pp), and (e,e’p) In plan angle ±4° Out of plan angle ±14° TOF 30-60 ns (~900-300 MeV/c) Nominal acceptance cuts Statistical uncertainties only

29. Preliminary R. Subedi et al., Science 320 (2008) 1476 9.5 ± 2 % Missing momentum [MeV/c] BNL Experiment measurment was 92 % +8+8 -18 96 ± 23 % Yield Ratio [%] R. Shneor et al., PRL 99, 072501 (2007) EXP 01-015 / Jlab (e,e’p) (e,e’pp)

30. Isospin 1 states Isospin 0 states Explanation lies in the dominance of the tensor part in the NN interaction M.S, Abrahamyan, Frankfurt,Strikman PRC,2005 Adapted from Sargasian talk Jlab., June 2013

31. Adapted from Sargasian’s talk, Jlab., June 2013: For 300-500 MeV/c New Data For 600-800 MeV/c When Pmiss increases we loose the extra np -SRC pairs due to the tensor force

32. Hall B Or analysis No class acceptance correction to the recoil proton

33. Report on the triple coincidence analysis Triple coincidence ratios:

34. (e,e’pn) /(e,e’pp) In plan angle ±4° Out of plan angle ±14° Nominal acceptance cuts no SRC correction Need x2 for the np/pp ratio

35. The global picture no SRC correction to the new data R. Subedi et al., Science 320, 1476 (2008) and the new data

36. BNL / EVA 12 C(e,e’pn) / 12 C(e,e’p) [ 12 C(e,e’pp) / 12 C(e,e’p)] / 2 [ 12 C(e,e’pn) / 12 C(e,e’pp)] / 2 R. Subedi et al., Science 320, 1476 (2008).

37. Report on the triple coincidence analysis MM distributions

38. Missing mass 750 MeV/c (e,e’pn) (e,e’pp) M p +m π

39. Missing mass 625 MeV/c (e,e’pn) (e,e’pp) M p +m π

40. Missing mass 500 MeV/c (e,e’pn) M p +m π

41. Report on the triple coincidence analysis Pcm distributions

42. “C.M. Momentum Distribution” 4 He(e,e’pn) For acceptance correction to the 4 He data we assumed: To be compared with 136±20 MeV/C for 12 C Pmiss=300-500MeV/c, Ran analysis. 160-180 MeV/c Or analysis, hall B data summary X XX ?

44. Sensitivity to angular and momentum cuts No angular cuts In ±5° Out ±15° In ±4° Out ±14° In ±6° Out ±16° 625 MeV/c

45. Sensitivity to angular and momentum cuts In ±5° Out ±15° In ±4° Out ±14° 750 MeV/c No angular cuts In ±6° Out ±16° In ±5° Out ±15° In ±4° Out ±14°

46. Sensitivity to angular and momentum cuts No angular cuts In ±5° Out ±15° In ±4° Out ±14° In ±6° Out ±16° 625 MeV/c

47. Sensitivity to angular cuts 625 MeV/c No angular cuts No MWDC In ±4° Out ±14° In ±6° Out ±16° In ±5° Out ±15°

49. 750 MeV/c 625 MeV/c 500 MeV/c