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Analysis UpdateE06-010 Transversity
Jin HuangPhD Candidate, MIT
For Hall A Collaboration MeetingJune 10, 2010 @ JLab
Jin Huang <[email protected]> 2
World first measurement of the SSA and DSA in SIDIS Reaction
PAC29 approved with A rating Major installation
◦ 3He Target, BigBite Electron Package, LHRS RICH Successful data taking from Oct 08 to Feb 09 Spokespersons
Xiaodong Jiang (Rutgers/Los Alamos, Contact Person), Jian-ping Chen (JLab), Evaristo Cisbani (INFN-Rome), Haiyan Gao (Duke), Jen-Chieh Peng (UIUC)
7 Thesis Students◦ K. Allada (Kentucky), C. Dutta (Kentucky), X. Qian (Duke)◦ J. Huang (MIT), J. Katich (W&M), Y. Wang (UIUC), Y. Zhang
(Lanzhou U)
Hall A Collaboration Meeting
E06-010 Overview
XeeHe ),(3
Leading-Twist TMDsQuark polarization
Un-Polarized Longitudinally Polarized
Transversely Polarized
Nucleon Polarization
U
L
T f 1T = g1T
=
h1L =
h1 =
h1T =
h1T =
Transversity
Boer-Mulder
PretzelositySivers
Helicity
Nucleon SpinQuark Spin
f1 =
g1 =
: Probed by E06-010Hall A Collaboration Meeting
Jin Huang <[email protected]> 4Hall A Collaboration Meeting
Access TMDs through SIDIS
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,
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Sh
Sh
Sh
Sh
h
h
LTSheT
LLeL
UTSh
ULSh
UTShT
ULhL
UUh
TUU
hhS
FS
FS
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F
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F
y
xyQdPdzddxdyd
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Unpolarized
PolarizedTarget
PolarizedBeam andTarget
Boer-Mulder
Sivers
Transversity
Pretzelosity
f1 =
f 1T =
g1 =
g1T =
h1 =
h1L =
h1T =
h1T =
SL, ST: Target Polarization; le: Beam Polarization
Worm-Gear
Worm-Gear
Jin Huang <[email protected]> 5Hall A Collaboration Meeting
E06‑010 Experiment Setup Polarized 3He Target
◦ Spin Flip & 3D rotation◦ 65% Polarization in experiment
Polarized Electron Beam ◦ ~80% Polarization◦ Fast Flipping at 30Hz
BigBite at 30º as Electron Arm◦ Pe = 0.7 ~ 2.2 GeV/c
◦ MWDC/Shower/Scintillator
HRSL at 16º as Hadron Arm◦ Ph = 2.35 GeV/c
◦ VDC/S1&2/A1/Gas C/RICH/Lead Glass
Beam Polarimetry(Møller + Compton)
LuminosityMonitor
Jin Huang <[email protected]> 6
Detector Calibration Done◦ Reported in last collaboration meeting
Target analysis close to finalization Extensive data quality checks Two analysis teams cross check results
◦ Red Team: Maximum Likelihood Method◦ Blue Team: Local Pair-Angular Bin-Fit Method◦ Asymmetry results are consistent
Systematics in progress Active theory supports
Hall A Collaboration Meeting
Analysis Progress
Jin Huang <[email protected]> 7
Polarimetry analyzed◦ NMR/water calibration◦ EPR
Target density close to finalized◦ Density measurement◦ Density w/ temperature correction
Temperature calibration coming soon Final polarization table coming soon
Hall A Collaboration Meeting
Target AnalysisY. Zhang, C. Dutta, etc.
Preliminary Target Density
~90% ~1.5% ~8%
Jin Huang <[email protected]> 8
GEANT3 Simulation of BigBite◦ COMGEANT based◦ Rate study◦ Confirmed electron
arm contamination study
Hall A Collaboration Meeting
Simulation of the ExperimentX. Qian, etc.
BigBite Momentum
DataMC (Sum All)
Jin Huang <[email protected]> 9
SIMC based simulation◦ Coming soon
Construct BigBite Update HRS/Target
◦ Simulating coinc event pair contamination diffractive ρ0
cross section bin centering angular asymmetry
extraction
Hall A Collaboration Meeting
Simulation of the ExperimentA. Puckett, X. Qian etc.
Energy Transfernormalization in progress
DataMC
Jin Huang <[email protected]> 10
Target spin sign◦ Carefully checked/maintained/recorded
Beam helicity sign◦ Important yet tricky
Could be easily flipped during installation/software◦ No direct online check for 3He experiments◦ Off line checked with a consistent story
21 elastic/quasi-elastic data sets checked Also by B. Zhao, G. Jin
Spin precession calculation Cross check sign with parity DAQ (with R. Michaels)
◦ Cross check welcome
Hall A Collaboration Meeting
Sign Checks
Jin Huang <[email protected]> 11
Data Quality Check◦ Run selection/beam trip cut/yield check/witness channel
check Cuts/contamination and systematic effect checked
Hall A Collaboration Meeting
Data Quality Check and Cuts
plot by X. Qian
Jin Huang <[email protected]> 12
Data Coverage
pT & ϕh± ϕS Coverage
Hall A Collaboration Meeting
Kinematics Coverage
x bin 1 : φh- φS x bin 4 : φh- φS
x bin 1: φh+ φS
x bin 4 : φh+ φS
Q2>1GeV2
W>2.3GeV
z=0.4~0.6
W’>1.6GeV
x bin 1 2 3 4
Jin Huang <[email protected]> 13
It’s not simple!◦ Spin flip/angular coverage/kinematics dependence
Two analysis team◦ Independent method/code/compare results
Blue Team◦ local pair-angular bin-fit method◦ Low bias from yield drift◦ ideal for pion spin asymmetry extraction
Red Team◦ Maximum Likelihood method◦ Tech note: http://www.jlab.org/~jinhuang/Transversity/MLE.pdf
◦ Stable at low statistic/capable of high dimensional fitHall A Collaboration Meeting
Asymmetry Extraction
Jin Huang <[email protected]> 14
Both asymmetry and modulation cross checked Results are well consistent
Hall A Collaboration Meeting
Result Compare
E06010 RAW
ASYM
.
PRELIM
INARY
Jin Huang <[email protected]> 15
3He Collins SSAs are not large (as expected) 3He Sivers SSAs follow the trend of Anselmino et
al. 2009
Hall A Collaboration Meeting
Preliminary AUT Results
E06010 PRELI
MIN
ARY
Jin Huang <[email protected]> 16Hall A Collaboration Meeting
Preliminary AUT Results, 2D plot
E06010 PRELI
MIN
ARY
>2σ signal!
Jin Huang <[email protected]> 17
Preliminary 3He ALT
◦ Systematic uncertainty is still under work◦ Projected neutron ALT stat. uncertainty : 6~10%
Hall A Collaboration Meeting
Preliminary ALT Results
E06010 PRELIMINARY
Jin Huang <[email protected]> 18
First measurement of angular modulated SSA and DSA in neutron (3He) SIDIS
Data cover valence range In progress:
◦ Simulation (coinc channel)◦ Systematics◦ Neutron asymmetry extraction◦ Kaon ALT asymmetries
Submitting first paper in few months
Hall A Collaboration Meeting
Conclusion
Jin Huang <[email protected]> 20
Item Systematic Uncertainty
N2 dilution 0.3~0.6% Relative
Yield Drift PPM Relative
MLE Non-local <100PPM Absolute Raw
MLE Approximation 125PPM Absolute Raw
BigBite π− Cont. 1~7% of Stat. Uncertainty
BigBite Photon-induced electron Cont. ~80%, 40%, 10%, 10% of Stat. Uncertainty
Random Coincidence Correction 10e-4 Absolute Raw
HRS Kaon Cont. 1.4e-4 Absolute Raw
Bin Centering ~10%, 6%, 10%, 20% of Stat. Uncertainty
Target Density 7PPM Absolute Raw
Target Polarization 5% Relative
Beam Polarization 3.8% Relative + 3.7% Rel.
Left HRS Single Track <5e-5 Absolute Raw
BigBite Tracking Quality ~1e-4 for Pi-; <5e-5 for Pi+ Absolute Raw
Livetime/Charge Asymmetry Correction MLE only: <10 PPM level Absolute Raw
A_LL leak 10~20% for Pi+ 5% for Pi- (Rel. to Stat. Uncer.)
Hall A Collaboration Meeting
Systematics of ALT