JLab12 / Gruppo Roma1-ISS JLab12 Prima Riunione Plenaria 18 Settembre 2008

1. JLab12 / Gruppo Roma1-ISS JLab12 Prima Riunione Plenaria 18 Settembre 2008 JLab12.0

2. Chi Siamo • Evaristo Cisbani (ISS) 70 • Francesco Cusanno (ISS) 100 • Salvatore Frullani (ISS) 40 • Francesco Ghio (ISS) 20 • Franco Garibaldi (ISS) 70 • Franco Meddi (UniRoma1) 30 • Giudo Maria Urciuoli (INFN-RM1) 30 Totale 3.6 FTE Tecnici (da ISS) • Stefano Colilli 40 • Rolando Fratoni 70 • Fausto Giuliani 80 • Massimo Gricia 70 • Maurizio Lucentini 40 • Fabio Santavenere 80 Totale 3.8 FTE JLab12.0

3. Apparati Realizzati RICH Detector hadron arm septum magnets electron arm JLab12.0

4. Esperimenti in Hall A con leadership italiana 6 GeV ran E – 91-111 S. Frullani, J. Kelly, A. Sarty “Investigation of N-D transition via polarization observables in Hall A” E – 94-107 F. Garibaldi S. Frullani, J. LeRose, P. Markowitz “High Resolution Hypernuclear 1p shel Spectroscopy” E – 98-108 O.Baker,S. Frullani, M. Iodice “Electroproduction of Kaons up to Q2 = 3 GeV/c)2” E – 97-110, JP Chen, A Deur, F. Garibaldi “*GDH Rum Rule of 3He and Neutron using nearly real photons” E 06-007, K. Aniol, A. Saha, G.M. Urciuoli, G. Udias, “Impulse Approssimation Limitations to the (e,e’p) on 208Pb(e,e’p)” JLab12.0

5. 6 GeV to run E – 06-011, E. Cisbani, H. Gao, X, Jiang “Target Single Spin Asymmetry in Seminclusive Deep Inelastic (e’e’ pai+) Reaction on a Transversity Polarized 3He Target” E – 06-002, R. Michaels, P. Souder, G.M.Urciuoli “A Clean Measurement of Neutron Skin of 208Pb trough Parity Violatung Electron Scattering” E – 07-012, F. Garibaldi, M. Iodice, J. LeRose, P. Markowitz “The Angular Dependence of 16O(e,e’K)16N_Lambda, and H(e,e’K)Lambda” 12 GeV PR-12-07-109, C.Perdrisat, L.Pentchev, E.Cisbani, V.Punjabi, B.Wojtsekhowski “Large Acceptance Proton Form Factor Ratio Measurement at 13 and 15 GeV2 Using Recoil Polarization Method” - working groups ---> white papers - hypernuclear physics - spin structure of neutron - form factors - Gep --> super bigbit spectrometer for Hall A JLab12.0

6. Proton E/M Form Factors (by polarization transfer in elastic ep scattering) JLab12: measurements up to Q2 = 15 GeV2 Rosenbluth, one photon exchange approximation Longitudinal Pl and transverse Ptpolarizations of the scattered proton • Definitive test for many phenomenological models aiming to explain the GEp/GMp slope • Investigate non-perturbative to perturbative QCD region • Set limit or observe pQCD asymptotic • Most likely will investigate negative region Dramatic evidence of inadequate interpretation of lepton scattering experiments JLab12.0

7. JLab12.0

8. JLab12.0

9. JLab12.0

10. JLab12.0

11. JLab12.0

12. Chamber Layout • 3 GEM foils • 100x40 cm2 • Single large foil not strictly required • Last foil segmented (to reduce hits ambiguity) ? 2D xy strip Readout (COMPASS design) 2 foils: 50x40 cm2 each 400 mm pitch 4500 channels Total Thickness: X0 < 0.7 % JLab12.0

13. GEM Principle JLab12.0

14. SBS Primary Tracker JLab12.0