jin huang phd candidate, mit for hall a collaboration meeting june 10, 2010 @ jlab

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

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L

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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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PolarizedTarget

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Transversity

Pretzelosity

f1 =

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h1 =

h1L =

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SL, ST: Target Polarization; le: Beam Polarization

Worm-Gear

Worm-Gear


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


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


Analysis Progress


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


Target AnalysisY. Zhang, C. Dutta, etc.

Preliminary Target Density

~90% ~1.5% ~8%


GEANT3 Simulation of BigBite◦ COMGEANT based◦ Rate study◦ Confirmed electron

arm contamination study


Simulation of the ExperimentX. Qian, etc.

BigBite Momentum

DataMC (Sum All)


SIMC based simulation◦ Coming soon

Construct BigBite Update HRS/Target

◦ Simulating coinc event pair contamination diffractive ρ0

cross section bin centering angular asymmetry

extraction


Simulation of the ExperimentA. Puckett, X. Qian etc.

Energy Transfernormalization in progress

DataMC


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


Sign Checks


Data Quality Check◦ Run selection/beam trip cut/yield check/witness channel

check Cuts/contamination and systematic effect checked


Data Quality Check and Cuts

plot by X. Qian


Data Coverage

pT & ϕh± ϕS Coverage


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


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


Both asymmetry and modulation cross checked Results are well consistent


Result Compare

E06010 RAW

ASYM

.

PRELIM

INARY


3He Collins SSAs are not large (as expected) 3He Sivers SSAs follow the trend of Anselmino et

al. 2009


Preliminary AUT Results

E06010 PRELI

MIN

ARY


Preliminary AUT Results, 2D plot

E06010 PRELI

MIN

ARY

>2σ signal!


Preliminary 3He ALT

◦ Systematic uncertainty is still under work◦ Projected neutron ALT stat. uncertainty : 6~10%


Preliminary ALT Results

E06010 PRELIMINARY


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


Conclusion


Backup SlidesSystematics Table



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.)


Systematics of ALT

jin huang phd candidate, mit for hall a collaboration meeting june 10, 2010 @ jlab

Documents

collaboration meetingjune

huang mit

target polarization

target analysisy

bigbite target collimator

preliminary target density

bigbite electron package

analysis updatee06