Update on Experiments using SoLID Spectrometer

Yi Qiangfor SoLID Collaboration

Hall A Collaboration Meeting Dec 16, 2011

SoLID Update

2Overview SoLID: Solenoidal Large Intensity Device

High rate capability: allow for high luminosity Full 2π azimuthal angular acceptance

Three experiments approved PVDIS: E12-10-007 SIDIS of polarized 3He: E12-10-006 and E12-11-007 All rated “A” by PAC

Conditionally approved SIDIS using proton target: PR12-11-108

Instrumentation Update see Zhiwen Zhao’s talk

12/16/2011

SoLID Update

3SoLID Spectrometer

12/16/2011

PVDIS SIDIS

CoilBaffles

GEMs

GasCherenkov

Calorimeter

GEMs

Yoke

Target

Calorimeter

GEMs

GasCherenkov Calorimeter

Heavy GasCherenkov

Coil

Yoke

Target

Can you find six differences between these panels?

Target Location, Baffles (PVDIS), Cherenkov’s,GEM Layout, Extra E-Cal, Beam Pipe

SoLID Update

4PVDIS E12-10-007 - Motivation

12/16/2011

APV GFQ

2

2a(x) Y (y) b(x)

b(x) C2iQi fi

(x)i

Qi2 fi

(x)i

Standard Model

RCSV APV x APV x 0.28

u x d x u x d x

u(x) up (x) dn (x)

d(x) d p (x) un (x)

CSV at Quark Level Di-quarks inthe nucleon

(Q2 Dependence)

d/u forHydrogen

SoLID Update

5PVDIS - Statistics vs. Kinematics Strategy: ~0.5% precision over broad kinematic range

for sensitive Standard Model test and detailed study of hadronic structure contributions

12/16/2011

4 months at 11 GeV

2 months at 6.6 GeV

Error bar σA/A(%) shown at center of bins in Q2, x

23 2

1[1 ]

(1 )HT CSVA A xx Q

Untangle physics with

Approved beam time: 169 days

SoLID Update

6SIDIS - Motivation TMDs provides 3-D momentum

imaging of nucleons in addition to f1 and g1

A new phase of study, fast developing field

SIDIS: gold mine for all TMDs Access all eight leading-twist

TMDs through spin-comb. & azimuthal-modulations

12/16/2011

TMD

Nucleon Spin

QCD Dynamics

Quark OAM / Spin

QCD Factorizatio

n

3-D Tomograph

y

Lattice QCD

Models

in DISNucleon -> Plate

Transverse motionpreserved

Scattering Plane

SoLID Update

7SIDIS E12-10-006 Measurement of SSA in SIDIS with SoLID on

a transversely polarized 3He <10% d quark tensor charge (Collins moments)

Fundamental property of nucleon benchmark test of Lattice QCD

4-D (x,Q2,z,PT) mapping of Sivers moments Orbital Angular Momentum (OAM): Im[(L=0)q×(L=1)q] Search for sign change in Sivers function vs. Drell-Yan

Aim for first non-zero Pretzelosity Moments Direct Probe of relativistic effect and OAM within models

SIDIS using SoLID and 3He Large acceptance and high Luminosity Complete 2π coverage: better angular separation 3He target: > 60% polarization, L(n) ≈ 1036 cm-2s-1

Measuring cross section ratios on p, d, 3He Study factorization, PT dependence, and FSI

12/16/2011

Collins Effect

Sivers Effect

SoLID Update

8SIDIS E12-11-007 SIDIS using Longitudinally Pol. 3He and SoLID Extraction of novel TMDs

Many predictions available First Lattice QCD calculation Light-cone quark model and others

No GPD Correspondence Sign of intrinsic transverse motion

Links to Collinear PDFs

12/16/2011

1

1

1

(sin(2 ))

(cos( ))UL h

LT h

LL

L

T

L

S

A

A

A

h

g

g

pT dependent helicity distribution

WORM-GEAR distributions,interference of OAMs: Re[(L=0)q×(L=1)q]

Light-Cone CQM, arXiv:0806.2298

h1L⊥(1)

S-P int.

P-D int.1

1

T

L

g

h

Lattice QCD, arXiv:0908.1283

12

1

1

(1)1

(1)1

2

1

( )

( )

( )

( )

WW type

WW type

qL

qT

q

x

x

q

h ydy

xy

dyg y

h x

g x xy

9

Example projections of Neutron Collins moments, 1 of 48 z-Q2 panels, over

1000 bins for each asymmetry.

Expected Improvement of Sivers Function

From A. Prokudin E12-10-006: 90 daysE12-11-007: 35 days

dAstat. ≈ 0.5% (absolute neutron asy.)dAsys./A ≈ 6% (relative)

<10% d quark tensor charge

Ultimate Precision 4-D Mapping

SoLID Update

10SIDIS PR12-11-108 SIDIS Using SoLID and a Transversely

Polarized Proton Target Perfect complementary experiment to 3He SoLID SIDIS

experiments: same coverage, similar statistics Conditionally approved on target

Beam line similar to g2p/gep configuration JLab/UVa/SLAC polarized target, used in many different

experiment (SANE, RSS etc..)o 3cm long NH3 targeto 5 Tesla superconducting magneto Dynamic Nuclear Polarization(DNP) using microwave pumpingo Target magnet optimized for longitudinal setting

Need new magnet with larger opening angle to cover entire phase space

Spin-flip using Adiabatic Fast Passage (AFP) technique Plans to improved packing fraction (using target disks

instead of beads)

12/16/2011

SoLID Update

11Collaboration International Collaboration: 8 countries, 50+ institutions

Rapid growth in US-China collaboration Magnet/Support/Simulations (Argonne/Duke/UVa/Umass) Tracking (UVa/Caltech/Tsinghua/USTC/CIAE/LanzhouU) Gas Cherenkov(Temple/Duke/Stony Brook) EM Calorimeter (UVa/Los Alamos/WM) TOF with MRPC (Tsinghua/Duke) DAQ and Trigger (Jlab/UMass) Polarimetry (UVa) Targets (Jlab/UVa) Infrastructure (Jlab/Duke)

12/16/2011

SoLID Update

12Progress/Plan Design of all subsystems are all progressing well.

See Zhiwen’s talk for more hardware update. Some hardware beam tests are scheduled. New collaborators joined:

Stony Brook group: Cherenkov detector/GEM William Mary group: Calorimeter

Regular collaboration meetings. Physics division “brainstorming” meeting in Sep. 2011

went well. Next one on Jan. 6 2012. Preparing for Jlab director’s review. Informal contact with DOE.

12/16/2011

SoLID Update

BACKUP SLIDES

12/16/2011

SoLID Update

14PVDIS Sensitivity - C1 and C2 Plots

12/16/2011

15Slide from A. Prokudin

16SBS vs. SoLID From A. Puckett

17About <10% d quark Tensor Charge Precision is not directly limited by statistical

precision. However,

Precision is essential to control systematic uncertainties (SIDIS factorization, PT dependence, Higher Twist Contribution …)

Based on current knowledge, expect to control systematic uncertainty down to 7-15%.

Need data to tell us the final number! 10% is a the goal for our data.

18Tensor Charge Determination For u and d quark, the covered x

range is about 0.05-0.75 (assuming a W>2.0 and W’>1.5 cut).

Contribution from 0-0.05 is about 1% (u) and 4% (d) (Torino Group)

Contribution fom 0.75-1.0 is about 1.5% (u) and 0.2% (d)

Quoting 3-4% in total for contribution in unmeasured region.

19

High luminosity: L(n) = 1036 cm-2 s-1

Polarization in all 3 directions (L, T, V) Record high in-beam ~ 60% polarization Fast spin flip (every 20 minutes)

Performance of 3He Target