Double spin asymmetry measurement from SANE-HMS data at Jefferson Lab Hoyoung Kang For SANE collaboration Seoul National University DIS 2013 2013/04/23.

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Double spin asymmetry measurement from SANE-HMS data at Jefferson Lab Hoyoung Kang For SANE collaboration Seoul National University DIS /04/23

Outline Introduction to SANE with motivation Experimental setup Dilution Factor from Packing fraction Preliminary HMS Asymmetries Summary

SANE - Spin Asymmetries on the Nucleon Experiment Spin Asymmetries on the Nucleon Experiment, or SANE(TJNAF E07-003), is a measurement of the proton spin asymmetries done in the Hall C of Thomas Jefferson National Accelerator Facility(Jefferson Lab), Virginia USA during January-March 2009, excluding installation and commissioning periods.

Spin Structure Functions Inclusive DIS cross section depends on four structure functions, two unpolarized (F 1, F 2 ) and two polarized (g 1, g 2 ). The spin structure functions g 1 and g 2 can be experimentally determined by measuring spin asymmetries:

Purpose of SANE

World Data and SANE Region

Jefferson Lab CEBAF

Experimental Setup ΘB = 180° ΘB = 80°

Experimental Setup ΘB = 180° ΘB = 80° BETA preliminary result has been reported at SPIN 2012 by H. Baghdasaryan

High Momentum Spectrometer HMS has smaller angular acceptance than BETA, but with precise measurement. HMS collected complementary data in SANE by varying central angle and momentum. Resonance Spin Structure(RSS) experiment(2002) have produced meaningful results with limited HMS kinematics and data. (1.085 GeV =1.3 GeV 2 ) Phys. Rev. Lett. 105, (2010) Phys. Rev. Lett. 98, (2007) Phys. Rev. C 74, (2006)

HMS coverage for SANE

Dilution Factor from Packing Fraction Beam Polarization ~80% Proton(target) Polarization ~70% Dilution Factor

Packing fraction is the relative volume ratio of ammonia to the target cell, or the fraction of the cell’s length that would be filled with ammonia by cylindrical symmetry. Effectively Dilution Factor from Packing Fraction

Comparing data with Monte Carlo results assuming 50% and 60% packing fraction of target, 60.9% packing fraction is determined for the target material # NH3. Data to MC ratio (W spectrum)Data and MC comparison (Red is MC) Packing fraction

Dilution factor is calculated using MC, comparing cross sections of each materials in target cell. And packing fraction is the only necessary input for each target cell. Dilution factor with PF of 60.9% Dilution factor with PF of 57.2% Dilution factor

Preliminary Asymmetries Because SANE measured parallel and near-perpendicular asymmetries, careful determination of axis and angle is necessary. To compare SANE result with previous experiment, Resonance Spin Structure (RSS), SANE’s perpendicular asymmetry has been defined as a combination of parallel and near-perpendicular asymmetries with sine and cosine factors.

Preliminary Asymmetries

(1) (3) (2)

Preliminary Asymmetries SettingBeam energy (GeV) HMS central momentum (GeV) HMS angle from beamline (degree) (1)4.7 (par) / 5.9 (per) 3.2 (par) / 4.4 (per) 20.2 (par) / 15.4 (per) (2) (3)

Preliminary Asymmetries (1) Blue is with radiative correction / only statistical error included Very Preliminary

Preliminary Asymmetries (2) Blue is with radiative correction / only statistical error included Very Preliminary

Preliminary Asymmetries (3) Blue is with radiative correction / only statistical error included Very Preliminary

Preliminary Asymmetries Green triangles : CLAS EG1b result with Q 2 = 1.71 GeV 2 Red squares : RSS result with Q 2 = 1.3 GeV 2 Blue line : This work with Q 2 = 1.86 GeV 2

Preliminary Asymmetries Green triangles : CLAS EG1b result with Q 2 = 1.71 GeV 2 Red squares : RSS result with Q 2 = 1.3 GeV 2 Blue line : This work with Q 2 = 1.86 GeV 2

Preliminary Asymmetries Green triangles : CLAS EG1b result with Q 2 = 1.2 GeV 2 Red squares : RSS result with Q 2 = 1.3 GeV 2 Blue line : This work with Q 2 = GeV 2

Preliminary Asymmetries Green triangles : CLAS EG1b result with Q 2 = GeV 2 Red squares : RSS result with Q 2 = 1.3 GeV 2 Blue line : This work with Q 2 = GeV 2

SANE collaboration U. Basel, Florida International U., Hampton U., Norfolk S. U., North Carolina A&T S. U., IHEP-Protvino, U. of Regina, Rensselaer Polytechnic I., Rutgers U., Seoul National U., Temple U., TJNAF, U. of Virginia, College of William & Mary, Yerevan Physics I. Spokespersons: S. Choi (Seoul), M. Jones(Jlab), Z-E. Meziani (Temple), O. A. Rondon (U. of Virginia)

Summary  SANE is a measurement of spin structure functions in broad range of Bjorken x and Q 2.  HMS data covers various kinematic regions and it can produce meaningful results, besides BETA(main detector) data.  Using HMS data, dilution factor of each target cell is obtained.  Preliminary parallel and perpendicular asymmetries shows good agreement with previous experiments.

Backup slides

Experimental goal

ep deep inelastic scattering C. Amsler et al., Physics Letters B667, 1 (2008)

ep deep inelastic scattering

Spin structure functions

World Data of g 1 C. Amsler et al., Physics Letters B667, 1 (2008)

Jefferson Lab Thomas Jefferson National Accerator Facility Located in Newport News, Virginia, USA Funded by the U.S. Department of Energy's Office of Science Having CEBAF (Continuous Electron Beam Accelerator Facility) and three experimental halls

UVA Target Superconducting magnet applies 5-T magnetic field. The target and the magnet are cooled down by liquid helium. ~140 Ghz microwave frequency causes dynamic nuclear polarization up to 90%.

Big Electron Telescope Array - BETA BigCal Tracker Cherenkov Lucite Hodoscope

BETA

Target magnet

Target insert

MaterialPF(%)Error(%p) #2 JW 12/05 14NH NH3 # # NH # NH #8 & 5 6-2x-07 14NH #5 & 6 6-2x-07 14NH #3 6/28/07 NIST irrad 14NH #2 6/28/07 NIST irrad 14NH # NH # NH Packing fraction

Dynamic Nuclear Polarization The DNP process for polarizing protons, deuterons, or any nucleus possessing a magnetic moment, requires temperatures of ;1 K or less and large magnetic holding fields. For thermal equilibrium at 1 K and 5 T, the proton polarization is only about 0.5%. However, the polarization of the “free” electrons, associated with the paramagnetic radicals introduced into the target material, is greater than 99%. The electron polarization can be transferred to the proton through a hyperfine transition by irradiating the target with microwaves at appropriate frequencies. K. Abe et al., Physical Review D 58, (1998)

Dynamic Nuclear Polarization

Preliminary g 1 and g 2 from BETA J. Maxwell (UVA)

Borrwed Slides

Borrowed Slides