Min Huang Duke University, TUNL For the Jefferson Lab Hall A E (g2p) collaboration
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1 Min Huang Duke University, TUNL For the Jefferson Lab Hall A E (g2p) collaboration APS April Meeting, April 16th, 2013
2 E g 2p & the LT Spin Polarizability Spokespeople Alexandre Camsonne (JLab) Jian-Ping Chen (JLab) Don Crabb (UVA) Karl Slifer (UNH) Post Docs Kalyan Allada James Maxwell Vince Sulkosky Jixie Zhang Graduate Students Toby Badman Melissa Cummings Chao Gu Min Huang Jie Liu Pengjia Zhu Ryan Zielinski 2
3 Outline Introduction Physics Motivation Experimental Setup Status of Data Analysis 3
4 Electron Scattering Inclusive polarized differential cross section Nevzat Guler s Talk in G3 e(e,k) θ γ* * (ν,q) e (E,k ) P (M,0) W g1, g2: polarized nucleon spin structure functions 4
5 How to Obtain g 2 e e e e measured by g2p experiment, essential contribution to g2 in this kinematic region For the kinematic 2 2 d d region not measure for 2 2 d de' d de' d d, JLab Hall B EG4 A 2 2 t data will be combined d d d de' d de' d de' d de' Will measure both asymmetry and cross section 5
6 Motivation Measure the proton spin structure function g 2 in the low 2 Q 2 region (0.02<Q 2 <0.2 GeV 2 ) for the first time Extract δ LT to be a benchmark test of χpt calculations Unique opportunity to test the Burkhardt-Cottingham sum rule Crucial inputs for hydrogen hyperfine splitting and proton charge radius measurements Judith Mcgovern s talk in Q5 6
7 Spin LT Polarizability Can be calculated via χpt δ LT more suitable to test t the chiral dynamics of QCD (in comparison to the forward spin polarizability γ 0 ) Neutron data show large deviation from χpt calculations No proton data yet plot courtesy of V. Sulkosky 7
8 BC Sum Rule P N g2p projected H. Burkhardt and W. N. Cottingham, Annals. Phys., 56(1970)453 BC satisfied within errors for Neutron Inconsistency seen in proton data Mostly unmeasured for proton 8
9 Experimental Setup Large Scale Installation in Hall A Transverse polarized NH3 target (2.5/5T field) Low beam current (<100 na) -> >newbeamline diagnostics Rasters Septum magnets Septa BCM Rasters Chicane BPM Hall A High Resolution Spectrometer (HRS) Polarized NH3 Target Local Dump 9
10 Achievements DAQ rate is Hall A record 6~7 khz/hrs with <30% deadtime Polarized target performance has been outstanding <P T > 2.5T <P T > 5T BCM Rasters Chicane BPM Target Talk by Melissa Cummings X15 Polarized NH3 Target 10
11 kinematics Coverage run concurrently with G p e M p < W < 2 GeV 0.02 < Q 2 < 0.2 GeV 2 Beam Energy /GeV Target age Field /T
12 Projections 12
13 Status of Analysis courtesy K. Allada 13
14 Status of Analysis Complete! Run Database HRS optics w/o target field Detector calibrations Scalers T T lkb Offline target polarization calibration Underway HRS optics with target field Systematic uncertainty study of target polarization Beam position & raster calibrations Optics Talk by Chao Gu X15 Target Talk by Melissa Cummings X15 14
15 Online Results Yield courtesy R. Zielinski 15
16 Online Results Longitudinal 5T Asymmetry at E=2.254 GeV courtesy T. Badman 16
17 Summary The g2p experiment, ran in spring of 2012, took data covering M p < W < 2 GeV, 0.02 < Q 2 < 0.2 GeV 2 A first pass replay of production data is now complete, and data quality checks are underway! Will provide a precision measurement of g p 2p in the low Q 2 region for the first time Results will shed light on several physics puzzles Thanks to the g2p and Hall A collaboration! 17
18 Backup 18
19 Hydrogen Hyperfine Structuret Hydrogen hyperfine splitting in the ground state has been measured to a relative high accuracy of S is the proton structure correction and has the largest uncertainty Z can be determined from elastic scattering, -41.0± pol involves contributions of the inelastic part (excited state), and can be extracted to 2 terms corresponding to 2 different spin- dependent structure function of proton 19
20 Hydrogen Hyperfine Structuret g2 p Experiment Integrand of 2 B2 is dominated by low Q2 part g2p is unknown in this region, so there e may be huge error when calculating 2 This experiment will provide a constraint 20
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