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19-23 April 2010 DIS 2010 / Florence Neutron Single Target Spin Asymmetries in SIDIS PowerPoint PPT Presentation


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19-23 April 2010 DIS 2010 / Florence Neutron Single Target Spin Asymmetries in SIDIS (at JLab HallA) E. Cisbani INFN Rome and Italian National Institute of Health on behalf of the 6 GeV Transversity collaboration http://hallaweb.jlab.org/experiment/transversity/. Outline.

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19-23 April 2010 DIS 2010 / Florence Neutron Single Target Spin Asymmetries in SIDIS

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19 23 april 2010 dis 2010 florence neutron single target spin asymmetries in sidis

19-23 April 2010

DIS 2010 / Florence

Neutron Single Target Spin Asymmetries in SIDIS

(at JLab HallA)

E. Cisbani

INFN Rome and Italian National Institute of Health

on behalf of the 6 GeV Transversity collaboration

http://hallaweb.jlab.org/experiment/transversity/

E. Cisbani: n SSA @ JLab/Hall A


Outline

Outline

  • Single Spin Asymmetries in SIDIS on transversely polarized target

  • “Transversity” Experiment in HallA

    • Kinematic

    • Target

    • Detectors (HRS + BB)

    • Hadrons Production

  • JLab 12 GeV prospective

    • “SIDIS” Experiment with SBS

    • “Transversity” Experiment with SoLID

Ongoing analysis thanks to the excellent work of several PhD Students:

C. Dutta (Kentucky), J. Huang (MIT), A. Kalyan (Kentucky), J. Katich (W&M), X. Qian (Duke), Y. Wang (UIUC), Y. Zhang (Lanzhou U)

E. Cisbani: n SSA @ JLab/Hall A


From sidis to ssa to df ff

From SIDIS to SSA to DFFF

Pretzelosity

E. Cisbani: n SSA @ JLab/Hall A


Collins moments on proton deuteron

Collins Moments on proton/deuteron

COMPASS/deuteron

proton

Hepex-0802.2160

From Pappalardo / Transversity 2008

  • Proton:

    • K- and p- with opposite sign, strong flavor dependence (but K errors significant)!

    • K+ and p+ consistent with u dominance

    • COMPASS compatible with HERMES

  • Deuteron: consistent with 0, expected asymmetry on neutron as large as on proton

From DIS2009

Larger effects at larger x

E. Cisbani: n SSA @ JLab/Hall A


Sivers moments on proton deuteron

Sivers Moments on proton/deuteron

HERMES on p

NEW DATA FROM COMPASS/Proton

SEE H. Fischer and A. Martin talks in this conference

COMPASS/deuteron

PLB673(2009)127

PRL103(2009)152002

  • Proton:

    • K+ twice p+ conflict with u dominance expectation

    • K- and p- consistent with 0

    • COMPASS proton not fully compatible to HERMES

  • Deuteron: consistent with 0, expected asymmetry on neutron as large as on proton

E. Cisbani: n SSA @ JLab/Hall A


Jlab accelerator facility

JLab Accelerator Facility

6 GeV CEBAF (< 2013)

Max Current: 200 mA

Max Energy: 0.8 - 5.9 GeV

Long. Polarization: 85%

E. Cisbani: n SSA @ JLab/Hall A


Transversity on neutron hall a experimental setup

Transversity on neutron: Hall A experimental setup

e+3He→e’+p(K)+X

  • Beam e-:

    • 5.9 GeV, 15 mA

  • Neutron Target:

    • High pressure polarized 3Hepol. 65%, 50 mg/cm2 x 40 cm

  • Luminosity: 1036/s/cm2

  • Electron Arm (BigBite):

    • E’=0.72.2 GeV,J=30°, DW=64 msr

  • Hadron Arm (HRS Left):

    • Ph =2.35 GeV/c ± 5%,J=30°, DW=6 msr, p/K ID

  • Kinematic region:

    • Q2 ~ 2.2 GeV2,x ~ 0.130.45, z~ 0.5

  • Measure Collins, Sivers and Pretzelosity

E06-010

Data Taking:Nov/08 – Feb/09

E. Cisbani: n SSA @ JLab/Hall A


3 he n polarized target

3He (n) Polarized Target

  • Polarized 3He ~ polarized neutron target

  • Use 3 COMET lasers (narrow line, high power) for optical pumping of Rb vapor

  • Fast spin exchange (via K) by 3He hyperfine interaction in oven; small part of N2 to quench soft photon depolarization of Rb

  • Polarized 3He diffuses to the target chamber

  • Transverse Horizontal (In-plane) and Vertical orientations

  • 20 minute spin flip

  • NMR and EPR polarimetries

  • Superior performances:

    • Steady 65% polarization @ 15 uA beam (world record)

E. Cisbani: n SSA @ JLab/Hall A


Electron arm bigbite

Electron Arm (BigBite)

E. Cisbani: n SSA @ JLab/Hall A


Hadron arm hrs l

Hadron Arm: HRS-L

1.27

NIM A522 (2004) 294

E. Cisbani: n SSA @ JLab/Hall A


Measured phase space

Mx

Measured Phase Space

DIS: Q2>1, W>2.3, Mx>1.6, 0.3<z<0.7

E. Cisbani: n SSA @ JLab/Hall A


Hadron identification

Hadron Identification

  • Aerogel Cherenkov Counter

    • p rejection > 98%

  • Time of Flight

    • K/p separation at 4s

  • RICH proximity focusing detector

    • K/p separation at 3.8s

Preliminary

Ph = 2.33 – 2.47 GeV/c

Strongest

quality cuts

E. Cisbani: n SSA @ JLab/Hall A

data from APS2010 / Y. Wang


Projected stat on p asymmetries

Projected Stat. on p Asymmetries

Work in progress

Preliminary results expected to be released within summer/2010 !

(Extend measurement to x=0.4)

E. Cisbani: n SSA @ JLab/Hall A


19 23 april 2010 dis 2010 florence neutron single target spin asymmetries in sidis

JLab at 12 GeV

and

the SSA measurements prospective in Hall A

E. Cisbani: n SSA @ JLab/Hall A


Cebaf 12 gev upgrade

add Hall D

(and beam line)

Upgrade magnets and power supplies

CHL-2

CEBAF 12 GeV upgrade

6 GeV CEBAF (< 2013)

Max Current: 200 mA

Max Energy: 0.8 - 5.9 GeV

Long. Polarization: 85%

12 GeV CEBAF

(>2013)

Max Current: 90 mA

Max Energy Hall A,B,C: 10.9 GeV

Max Energy Hall D: 12 GeV

Long. Polarization: 75-85%

E. Cisbani: n SSA @ JLab/Hall A


19 23 april 2010 dis 2010 florence neutron single target spin asymmetries in sidis

1037

Peculiarity of JLab Phase Space

Access unexplored valence region

(high Q2 requires high luminosity)

Hall A is already running at 1036 and will likely reach few 1037 (in polarized experiments)

E. Cisbani: n SSA @ JLab/Hall A

from TMD-Duke / M. Contalbrigo


Ssa on n in the 11 gev era in hall a

SSA on n in the 11 GeV era in Hall A

  • SIDIS on p and K (conditionally approved, 01/2009) – short term

    • G. Cates, E. Cisbani, G.B. Franklin, B. Wojtsekhowski

    • Similar layout of the 6GeV experiment at higher luminosity and acceptance

      • HRS replaced by a new large acceptance spectrometer (SBS), improved target

    • 2D binning on the relevant variables: x, P and z, for both hadrons and Q2 dependence

    • High x valence region (with overlap to HERMES, COMPASS, JLab6 data)

    • Proposal: http://hallaweb.jlab.org/collab/PAC/PAC34/PR-09-018-sidis.pdf

  • SoLID-Transversity experiment (approved, 01/2010) – medium term

    • J.-P. Chen, H. Gao, X. Jiang, J.-C. Peng, and X. Qian

    • Use solenoid magnet

      • 2p angular coverage  optimal systematics control

    • Precision measurement in 4D phase space (x, z, P and Q2)

    • Extended phase space coverage

    • Proposal: http://hallaweb.jlab.org/collab/PAC/PAC35/PR-10-006-SoLID-Transversity.pdf

E. Cisbani: n SSA @ JLab/Hall A


Sidis experimental setup

HERMES

RICH

SIDIS: Experimental Setup

e+3He→e’+p(K)+X

Measure the SSA of SIDIS processes n(e,e’p)X and n(e,e’K)X

BB: e-arm at 30o

 = 45 msr

GEM Tracker

Gas Cherenkov

Shower

 GMn/PR-09-019

SBS:h-arm at 14o

 = 50 msr

GEM tracker

excellent PID / RICH

Hadron CALO

Most of the equipments from EM Form-Factors experiments

Event rate: ~104×HERMES

60 days of production expected stat. accuracy:

1/10 of proton HERMES

Beam: 50 A, E=8.8 and 11 GeV (80% long. Pol.)

Target: 65% polarized 3He  GEn(2)/PR-09-016

 Luminosity: 1.4×1037 cm-2s-1, 0.05 sr

PAC34 Conditionally Approved experiment

E. Cisbani: n SSA @ JLab/Hall A


Sidis a new target

SIDIS: A new target

E. Cisbani: n SSA @ JLab/Hall A

from SBS-IV / G.D. Cates


Sidis hadron pid hermes rich

SIDIS: Hadron PID HERMES RICH

5.5 GeV K+

C4F10 gas

REAL DATA from NIMA 479 (2002) 511

14.6 GeV e-

1.5 GeV p-

Very stable performance (dn/(naerogel-1)= 1%, 9 years)

Stored at UVa under safe/controlled conditions

(also additional wall of spare Aerogel)

E. Cisbani: n SSA @ JLab/Hall A


Sidis q 2 coverage

Prop. Exp. Ebeam = 11.0 GeV

Prop. Exp. Ebeam = 8.8 GeV

Current Transversity Exp. E06-010

SIDIS: Q2 coverage

We will investigate the Q2 dependence of the Sivers and Collins functions, with overlap in the region of HERMES; reveal higher twist effects.

Analysis of the Q2 effect will use also the results of 6 GeV E06-010 Transversity experiment

E. Cisbani: n SSA @ JLab/Hall A


Azimuthal coverage

Azimuthal Coverage

fh

Partial coverage of fh

but in sin/cos sensible regions

0.15 < x <0.65

Jh_cent. = 14°

Ebeam = 11 GeV

4 target spin directions

Complete coverage of the Collins, Sivers and “Pretzelosity” azimuthal angles with 4 target spin directions

(with 8 target spin directions even better uniformity)

E. Cisbani: n SSA @ JLab/Hall A


Sidis expected statistical accuracy on k

SIDIS: Expected Statistical Accuracy on K

  • Superior quality of Kaon data

  • Extend at higher x with partial overlap with existing data on proton, deuteron and expected results of HallA Transversity 6 GeV

DF from CTEQ5M

FF from DSS

Rate normalized to HERMES/p+d K production

E. Cisbani: n SSA @ JLab/Hall A


Solid experimental setup

SoLID: experimental setup

Solenoid magnetic field (2p azimuthal coverage)

Polarized target in a fringe field similar to 6 GeV experiment

Tracking: GEM technology

CALO + Cherenkov threshold for PID

Multi-RPC for timing

Large part of the setup used for PVDIS experiment

E10-006 PAC35 Approved experiment

E. Cisbani: n SSA @ JLab/Hall A

from JLab-PAC35 / X. Qian


Solid phase space

SoLID: Phase Space

E. Cisbani: n SSA @ JLab/Hall A

from JLab-PAC35 / X. Qian


Solid projected data

x

SoLID: Projected Data

E. Cisbani: n SSA @ JLab/Hall A

from JLab-PAC35 / X. Qian


Summary

Summary

  • 6 GeV “Transversity” Experiment on p and K

    • Data taken on n in 3 months (Nov/08 – Feb/09)

    • Almost completed analysis for p-SSA

    • First results to be released soon (likely before Summer/2010)

  • 12 GeV Prospective (after 2013)

    • Two SSA experiments proposed on 3He target in HallA

    • Will provide data on Transversity/Sivers/Pretzelosity in the valence region at different Q2 using the same physics mechanism but complementary instrumental approaches  different time scale and projected performance:

      • SBS-SIDIS: p and K SSA with quite improved statistics

      • SoLID-Transversity: p SSA with ultimate precision

    • both will benefit of JLab luminosity and 3He polarized targets progress

E. Cisbani: n SSA @ JLab/Hall A


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