Possibilities for studying few nucleon correlations and Δ isobars in processes with several final state baryons.

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1 Possibilities for studying few nucleon correlations and Δ isobars in rocesses with several final state baryons. Short-Range Structure of Nuclei at 12 GeV October 26-27, 2007 Jefferson Lab, Newort News, VA USA Eli Piasetzky Tel Aviv University, ISRAEL

2 SRC in nuclei Roadma What is the role layed by short range correlation of more than two nucleons? 2N-SRC ρ 5ρ o How to relate what we learned about SRC in nuclei to the dynamics of neutron star formation and structure? ~1 fm 1.f 1.7f fm SRC in nuclei ρ o = 0.16 GeV/fm 3 Nucleons Are the nucleons in the SRC air different from free nucleons (e.g size,shae, mass, etc.)? Are they nucleons? NN interaction: what is the role layed by the reulsive core?

3 12C: n-src 18±4.5 % 2N-SRC 20±4.5 % -SRC 0.95 ± 0.2 % A single article in an average otential 80±4.5% The uncertainties allow a few ercent of: more than 2N correlations Non nucleonic degrees of freedom nn-src 0.95 ± 0.2 %

4 Identifying Future Exeriments Looking for SRC with more than 2 nucleons:

5 Identifying Future Exeriments Looking for SRC with more than 2 nucleons: The roblems: The cross sections are small. 1N >> 2N - SRC >> 3N SRC. Questions star geometry : What is the signature for 3N correlation? What is the difference from two 2N correlations? What is the exected isosin structure of the 3N?

6 Identifying Future Exeriments Looking for SRC with more than 2 nucleons: The roblems: The cross sections are small. 1N >> 2N - SRC >> 3N SRC. The cure for 1N background is : large miss and/or large X B The cure for 2N-SRC: X B >2 suression of the 2N-SRC at rel = MeV/c for nn or airs. or

7 Identifying Future Exeriments Looking for SRC with more than 2 nucleons: Colinear geometry : Initial configurations ~800 MeV/c ~800 MeV/c A very strong isosin deendence is exected for the 2N art. For the 3N? ~400 MeV/c ~400 MeV/c The 2N-SRC interaction is suressed, oening a window of oortunity to identify 3N correlation. The signal of today is tomorrow s background

8 Identifying Future Exeriments Looking for SRC with more than 2 nucleons: Colinear geometry! ~800 MeV/c ~800 MeV/c FSI are strong function of θ SRC are not

9 Identifying Future Exeriments Looking for non-nucleonic degrees of freedom " = a" + b" + c" SRC NN N!!! a! 0, b,c,...! N-SRC ρ 5ρ o Breaking the air will yield more backward Δ, π, k ~1 fm 1.f The signature of a non-nucleonic SRC intermediate state is a large branching ratio to a non nucleonic final state. Nucleons

10 Looking for non-nucleonic degrees of freedom In coincidence with (e, e ), as a function of the missing momentum we want to detect;, n, π-, π+ k - trile coincidence

11 Identifying Future Exeriments Looking for non-nucleonic degrees of freedom n n Δ 0 π - Δ + π+ n 0 # " $! " +! # + n 4 fold coincidence Exected rates 5-10% of recoil N

12 Kinematics Δ e + d # e" + +! ( q + " ) 2 = m d f! 2

13 The selected kinematics for E e Increasing, energy, ω,n Δ? Ee = GeV n or P = MeV/c 99 ± 5 0 *! e Pm = 300, 400, 500 MeV/c Q 2 =2 (GeV/c) 2 q v =1.65 GeV/c X= , 35.8, Ee = GeV = 1.45,1.42,1.36 GeV/c

14 The selected kinematics Increasing, energy and ω, N Δ Ee = 9.8 GeV P miss =770 MeV/c e e Ee = 11 GeV Cannot roduce backward going Δ. Cannot roduce larger momentum difference between the recoil Δ and the struck nucleon. e P miss =1.32 GeV/c P Δ =770 MeV/c Δ *! e = 1.32 GeV/c P Δ =770 MeV/c Δ *! Q 2 =2.5 (GeV/c) 2 q v =1.65 GeV/c X=1.12 = 1.32 GeV/c

15 Ee= Eout= theta_e = Q2= x= inut angle of (qe) and (q) lanes E+00 theta of q: The format of the following outut is: tye of the article, momentum, angle vs q, angle vs e, azimuthal angle in lab knock-out nucleon missing E+00 recoil tet between recoil and scattred roton miss in the q direction Ee= Eout= theta_e = Q2= x= inut angle of (qe) and (q) lanes E+00 theta of q: The format of the following outut is: tye of the article, momentum, angle vs q, angle vs e, azimuthal angle in lab knock-out nucleon missing E+00 recoil tet between recoil and scattred roton miss in the q direction

16 The selected kinematics for the measurement e Ee = 11 GeV Ee= Eout= theta_e = Q2= x= inut angle of (qe) and (q) lanes E+00 theta of q: The format of the following outut is: tye of the article, momentum, angle vs q, angle vs e, azimuthal angle in lab P Δ = 640 MeV/c Δ knock-out nucleon missing E+00 recoil tet between recoil and scattred roton miss in the q direction Pm = 640 MeV/c *! Q 2 =2 (GeV/c) q v =2.5 GeV/c X=0.5 e = 2.3 GeV/c Ee = 9 GeV

17 Δ =640 MeV/c With SHMS(e) and HMS() accetances With SHMS(e) and HMS() accetances and Γ=110 MeV Needs large accetance multi article detector

18 The LargeAccetanceMINUSFORWARD detector Multi article detection Particle ID Large solid angle- 4π non symmetric gae at the forward hemishere Large (full) luminosity e Δ *! e Can oerate in coincidence with small solid angle high resolution sectrometer / sectrometers

19 The CLAS Detector as LAMF BEAM For the new 12 GeV clas: The current magnet, Drift chambers, and scintillator counters are not to be used. Need new ower sulies, and electronics Require a careful, non trivial dismount of the current detector at Hall B and non trivial setu at hall c. Relace the EC by n-detectors (scintillators)

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21 Title: Authors: Publicati on: Publicati on Date: Search for cumulative Delta 0 (1232) and Delta + + (1232) isobars in neutrino interactions with neon nuclei Ammosov, V. V.; Asratyan, A. É.; Burtovoǐ, V. S.; Gaienko, V. A.; Gaienko, G. S.; Gorichev, P. A.; Denisov, A. G.; Zaets, V. G.; Klyukhin, V. I.; Koreshev, V. I.; Kruchinin, S. P.; Kubantsev, M. A.; Makhlyueva, I. V.; Pitukhin, P. V.; Sirotenko, V. I.; Slobodyuk, E. A.; Usubov, Z. U.; Fedotov, A. V.; Shevchenko, V. G.; Shekelyan, V. I. Journal of Exerimental and Theoretical Physics Letters, Vol. 40, /1984