Hall A Status Hall A Collaboration Meeting Dec 15, 2011 Robert Michaels Acting Hall A Leader Recent Activity Future Projects Scheduling Process Publications Borrel: Thursday at 6 pm in A110  give $9 to either me, Stephanie, or Doug

Recent Activity in Hall A (2011) May 13 Finished a series of experiments, started 6 mo. shutdown, install g2p/GEp August PAC new proposals, SBS SIDIS approved, 3 proposals graded (  next slide) Oct Review of SuperBigbite Spectrometer (SBS) by DOE favorable on science and technology. needed work on project management, cost, schedule. revised proj. mgt. plan (PMP) -- John LeRose -- due Jan. Oct – now g2p /GEp polarized target: Failure of superconducting magnet (shorts to ground). Decide : retrofit a magnet from Hall B, ready Feb 2012 Plan: reduced run of g2p/GEp Feb – May 2012 covering essential low-Q2 run plan. + 1 wk. commissioning run (w/o target) Dec (starting now).

PAC38 Results : Hall A NUMBERCONTACT PERSON TITLEDAYS REQUESTED DAYS AWARDED SCIENTIFIC RATE PAC DECISION PR R. Michaels PREX-II Precision Parity-Violating Measurement of the Neutron Skin of Lead 35 A Approved PR H. Gao SOLID-H(T) Target Single Spin Asym in SIDIS (e,e'π ± ) on a Transversely Polarized Proton Target 120 C2 (target design) PR I. PomerantzHard Photodisintegration of 3 He into pp and pn pairs 10 Reject PR P. Solvignon. Precision measurement of the isospin dependence in the 2N and 3N short range correlation region 19 A-Approved C B. Wojtsekhowski Measurement of Semi-Inclusive Pion and Kaon electroproduction in the DIS Regime on a Transversely Polarized 3He Target using the Super BigBite and BigBite Spectrometers in Hall A 64 A-Approved E C. Hyde Measurement of Electron-Helicity Dependent Cross Sections of Deeply Virtual Compton Scattering with CEBAF at 12 GeV 100 A Grade, time E H. Gao. SOLID-He3(T) An update to PR : Target Single Spin Asymmetry in Semi-Inclusive Deep- Inelastic Electro Pion Production on a Transversely Polarized 3He Target at 8.8 and 11 GeV 90 A Grade, time E J. Huang. SOLID-He3(L) Asymmetries in Semi-Inclusive Deep- Inelastic Electro-Production of Charged Pion on a Longitudinally Polarized He-3 Target at 8.8 and 11 GeV 35 A Grade, time New proposals Returning proposals -- was Conditional (C) or up for a grading Aug 2011

Uva/Jlab Polarized NH 3 Target Low Q 2 g p 2 and G E p Experiments (6 GeV) Scheduled Feb - May 2012 pending target repairs test run Dec 13 – 22 Modified Beamline in Hall A 0.02 < Q 2 < 0.40 GeV 2 Jian-Ping Chen A. Camsonne K. Slifer D. Crabb R. Gilman G. Ron D. Day A. Sarty J. Arrington Chicane Magnets Septum Low-current Monitors Local Beam dump Slow Raster

Schedule : Hall A g2p/GEp 12 mo. Shutdown Early 12 GeV Experiments 12 GeV Commissioning SuperBigbite MOLLER SOLID Physics Beam to Hall A Thomas Jefferson National Accelerator Facility calendar year 12 GeV Planning Committee Ron Gilman (chair), Javier Gomez Douglas Higinbotham, Charles Hyde Nilanga Liyanage, Kent Paschke SuperBigbite MOLLER

Have not produced a publication -- exceed the avg time (31 months) to the first: E forward GDH (Vince Sulkosky -- working on a draft) E A(Q) (Ron Gilman) E ,4He elastic (Makis Petratos ) E He(e,e'p) (Doug Higinbotham) E O(e,e'p) (Kevin Fissum) E Pb(e.e'p) (Konrad Aniol) E CSR (Jian-Ping Chen) Overdue archival publications GDH (Karl Slifer, Zein-Eddine Meziani), HAPPEX-II (Bob Michaels, David Armstrong) 3He(e,e'p) (Fatiha Benmokhtar) A,B(Q2) (Makis Petratos) Comments on archival publications They are a history of what we did, with sufficient detail to reproduce the results. 12 Month Shutdown: you have more time to write. They help your grant ! Reminder About Overdue Publications

Hall A Publications in 2011 S. Abrahamyan, et.al. Search for new gauge boson in the A‘ Expt (APEX). Phys. Rev. Lett 107:191804, 2011 J. Huang, et.al. Beam-Target Double Spin Asymmetry A_LT in Charged Pion Production from Deep Inelastic Scattering on a Transversely Polarized He-3 Target at 1.4 < Q 2 <2.7 GeV 2. arXiv: [nucl-ex] K. Paschke, et.al. New Precision Limit on the Strange Vector Form Factors of the Proton. arXiv: [nucl-ex] X. Qian, et.al., Single Spin Asymmetries in Charged Pion Production from Semi-Inclusive Deep Inelastic Scattering on a Transversely Polarized 3 He Target. Phys.Rev.Lett.107:072003,2011 G. Ron et al. Low Q 2 measurements of the proton form factor ratio $mu_p G_E / G_M$. arXiv: [nucl-ex] A.J.R. Puckett, et.al., Reanalysis of Proton Form Factor Ratio Data at Q 2 = 4.0, 4.8, and 5.6 GeV 2 arXiv: [nucl-ex] S. P. Malace, et.al. A precise extraction of the induced polarization in the 4 He(e,e'p) 3 H reaction Phys.Rev.Lett.106:052501,2011 E. Fuchey, et.al., Exclusive Neutral Pion Electroproduction in the Deeply Virtual Regime Phys.Rev.C83:025201,2011 J. Glister, et.al. Polarization Obs in Deuteron Photodisintegration below 360 MeV Phys.Lett.B697: ,2011. G.D. Cates, et.al., Flavor decomposition of elastic nucleon E&M form factors Phys.Rev.Lett.106:252003,2011 X. Zhan et al. Proton Elastic FF Ratio at low Q 2 Phys. Lett. B (2011) M. Friend, et.al.. Upgraded photon detector with integrating readout arXiv::1108:3115 [nucl-ex] S. Ban et.al.. Parity Violating Electron Scattering Measurements of Neutron Densities J. Phys. G , 2012 L. B. Weinsten, et.al., Short Range Correlations and the EMC Effect Phys. Rev. Lett. 106: , 2011 J. Arrington et al. Short-Range Nucleon-Nucleon Correlations arXiv: [nucl-ex] M. Meziane et al. Effects Beyond Born in Pol. Transf. Obs. ep Elastic Phys. Rev. Lett , 2011 S. Abrahamyan, et.al. Neutron Radius of 208Pb (PREX) about to submit to PRL S. Abrahamyan, et.al. Transverse Asymmetries from H, 4 He, 12 C, and 208 Pb about to submit to PRL

Publications : ~18 this year. Timely publications and Archival Papers are important ! g2p / GEp is starting Bright future for the 12 GeV era See you at the Borrel (Thurs 6 pm in A110) Summary : Hall A Status R. Michaels Hall A Collab. Mtg. Dec 15, 2011