E06-010 / E06-011 Transversity Experiments Overview, Manpower and Safety - PowerPoint PPT Presentation

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E06-010 / E06-011 Transversity Experiments Overview, Manpower and Safety

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Title: E06-010 / E06-011 Transversity Experiments Overview, Manpower and Safety


1
E06-010 / E06-011 Transversity
Experiments Overview, Manpower and Safety
Readiness Review, March 19, 2007
Spokesperson Jian-Ping Chen, Evaristo Cisbani,
Haiyan Gao, Xiaodong Jiang, Jen-Chieh Peng
  • Goal of the transversity experiments
  • Requirements of the transversity experiments
  • Collaboration and manpower
  • Safety issues

2
Physics Motivation Transversity
  • Remaining frontier of kT independent structure
    functions
  • Connections to many other kT dependent
    distribution and fragmentation functions
  • Major experimental efforts to measure
    transversity using lepton and hadron beams

3
How to measure transversity?
  • Chiral-odd ? not accessible in DIS
  • Require another chiral-odd object
  • Transversely Polarized Drell-Yan
  • Semi-Inclusive DIS
  • Single-hadron (Collins fragmentation function,
    H1-(z))
  • Two hadrons (Interference fragmentation function)
  • Vector meson polarization
  • ? - polarization

4
Leading-Twist Quark Distributions
Semi-inclusive DIS

can access all leading-twist quark distributions

( A total of eight distributions)

Three have no kT dependence
Transversity

The other five are transverse momentum (kT)
dependent (TMD)
Sivers function
5
Observation of Single-Spin Azimuthal Asymmetry
ep ? epx
HERMES
Longitudinally polarized target
ltSTgt 0.15
Origins of the sin(?) azimuthal asymmetry ?
Collins effect Correlation between the quarks
transverse spin with pions pT in the
fragmentation process ? dq(x) H1 - (z). Sivers
effect Correlation between the transverse spin
of the proton with the quarks transverse
momentum ? f1T- (x) D(z). Other higher twist
effects could also contribute.
6
Use transversely polarized hydrogen target to
separate the two effects (Collins vs. Sivers)
Simultaneous fit to sin(? ?s) and sin(? - ?s)
(?s is the azimuthal angle of the target spin)
7
Extraction of Collins functions from the Collins
asymmetry measurements
Fits to the Hermes data
Prediction of the Compass data
( Vogelsang and Yuan, hep-ph/0507266 )
8
Extraction of Sivers functions from the Sivers
moment measurements
Fits to the Hermes data
Prediction of the Compass data
( Vogelsang and Yuan, hep-ph/0507266 )
Striking flavor dependence of the Sivers function
(Sd -2Su)
9
Opportunities at JLab for transversity experiments
  • High-intensity CW electron beam
  • High-density polarized 3He target which could be
    polarized transversely
  • Probe valence-quark region similar to HERMES
    kinematics, providing complimentary information
    on transversely polarized neutron
  • An independent test of the striking flavor
    structures of Collins and Sivers functions
    observed at HERMES/COMPASS

10
3He?(e,ep,-)x at Hall-A
  • Beam
  • 6 GeV, 15 µA e- beam
  • Target
  • Optically pumped Rb-K spin-exchange 3He target,
    50 mg/cm2, 42 polarization, transversely
    polarized with tunable direction
  • Electron detection
  • BigBite spectrometer, Solid angle 60 msr, ?Lab
    300
  • Charged pion detection
  • HRS spectrometer, ?Lab -160

11
Kinematic coverage of the electron arm
  • BigBite spectrometer set at ?30 at beam-right
    detecting electrons with 0.5 lt E lt 2.2 GeV.
  • The coverage in Bjorken-x is 0.135 lt x lt
    0.405, corresponding to valence-quark region.
  • For the four x bins, the range of mean-Q2 is 1.3
    lt ltQ2gt lt 3.1 (GeV/c)2.
  • The coverage in W, the invariant mass of the
    hadronic system, is 2.33 lt W lt 3.05 GeV, well
    above the resonances region.

12
Hall-A polarized 3He target
  • 40-cm long Rb-K spin-exchange hybrid cell at 10
    atm with beam current of 15 µA
  • 42 target polarization with spin-flip frequency
    of 20 minutes
  • A third set of Helmholtz coils will be added,
    together with the laser optics, to allow for
    vertical polarization of the 3He target

13
Kinematic coverage of the hadron arm
  • HRSL situated at ? -16 will measure charged
    hadrons with mean momentum p 2.4 GeV/c.
  • The fraction of the virtual photon energy
    carried by the hadron, z Eh/?, is z 0.5 to
    detect leading pion in the current fragmentation
    region.
  • A cut of W gt 1.5 GeV is required to stay away
    from the delta resonance production region.

14
Predictions of Collins asymmetry on neutron
15
Instrumentation Request for E06-010/E06-011
  • Beam
  • Polarization above 75
  • Energy 6 GeV
  • Current 25 µA
  • Target (talk by Jian-Ping Chen)
  • 40-cm long Rb-K hybrid polarized 3He target at 10
    atm
  • gt 40 target polarization with spin-flip period
    of 20 minutes
  • Third sets of vertical Helmholtz coils and
    associated laser opticvs for vertical
    polarization

16
Instrumentation Request for E06-010/E06-011
  • HRS-L spectrometer (talk by A. Camsonne)
  • Momentum range 0.6-2.4 GeV/c
  • VDC1, VDC2, S1, Short gas Cherenkov, A1, S2M,
    Preshower/shower
  • RICH for p/K separation (talk by E. Cisbani)
  • Bigbite spectrometer (talk by X. Jiang)
  • Electron detection package
  • Wire-chamber-2 upgrade (talk by M. Shabestrai)
  • Gas Cherenkov (talk by B. Sawatzky)
  • Shielding and collimation

17
Hall A Transversity Experiments Collaboration
The Institutions
California State Univ., Duke Univ., Florida
International. Univ., Univ. Illinois, JLab, Univ.
Kentucky, Univ. Maryland, Univ. Massachusetts,
MIT, Old Dominion Univ., Rutgers Univ., Temple
Univ., Penn State Univ., Univ. Virginia, College
of William Mary, Univ. Sciences Tech, China
Inst. Of Atomic Energy, Beijing Univ., Seoul
National Univ., Univ. Glasgow, INFN Roma and
Univ. Bari, Univ. of Ljubljana, St. Marys Univ.,
Tel Aviv Univ.
Collaboration members (104 members)
A. Afanasev, K. Allada, J. Annand, T. Averett, F.
Benmokhtar, W. Bertozzi, F. Butaru, G. Cates, C.
Chang, J.-P. Chen (Co-SP), W. Chen, S. Choi, C.
Chudakov, E. Cisbani(Co-SP), E. Cusanno, R. De
Leo, A. Deur, C. Dutta, D. Dutta, R. Feuerbach,
S. Frullani, L. Gamberg, H. Gao (Co-SP), F.
Garibaldi, S. Gilad, R. Gilman, C. Glashausser,
J. Gomez, M. Grosse-Perdekamp, D. Higinbotham, T.
Holmstrom, D. Howell, M. Iodice, D. Ireland, J.
Jansen, C. de Jager, X. Jiang (Co-SP), Y. Jiang,
M. Jones, R. Kaiser, A. Kalyan, A. Kelleher, J.
Kellie, J. Kelly, A. Kolarkar, W. Korsch, K.
Kramer, E. Kuchina, G. Kumbartzki, L. Lagamba, J.
LeRose, R. Lindgren, K. Livingston, N. Liyanage,
H. Lu, B. Ma, M. Magliozzi, N. Makins, P.
Markowitz, Y. Mao, S. Marrone, W. Melnitchouk,
Z.-E. Meziani, R. Michaels, P. Monaghan, S.
Nanda, E. Nappi, A. Nathan, V. Nelyubin, B.
Norum, K. Paschke, J. C. Peng(Co-SP), E.
Piasetzky, M. Potokar, D. Protopopescu, X. Qian,
Y. Qiang, B. Reitz, R. Ransome, G. Rosner, A.
Saha, A. Sarty, B. Sawatzky, E. Schulte, S.
Sirca, K. Slifer, P. Solvignon, V. Sulkosky, P.
Ulmer, G. Urciuoli, K. Wang, Y. Wang, D. Watts,
L. Weinstein, B. Wojtsekhowski, H. Yao, H. Ye, Q.
Ye, Y. Ye, J. Yuan, X. Zhan, X. Zheng, S. Zhou,
X. Zong
Cospokesperson Ph.D students
18
Manpower and collaboration responsibilities
  • 4 Ph.D thesis students stationed at JLab
  • Chiranjib Dutta and Allada Kalyan (U. Kentucky)
  • Xin Qian (Duke U.) and Youcai Wang (UIUC)
  • 3 Postdocs
  • Xiaodong Jiang (Rutgers), Yi Qiang (Duke),
    Lingyan Zhu (UIUC)
  • Responsibilities
  • Duke Bigbite detector tests, 3He target,
    simulations
  • FIU HRS detectors
  • JLab Bigbite, Polarized 3He target, HRS, DAQ
  • INFN RICH and HRS-PID
  • UIUC HRS aerogel and RICH, vertical coils,
    Runplan
  • Rutgers Bigbite detectors, shielding, trigger
    and DAQ, Runplan
  • Temple Bigbite Cherenkov, 3He target
  • WM Pol 3He target and cells
  • U. Kenntucky Bigbite detector, trigger and DAQ,
    3He target
  • U. Virginia Bigbite MWDC, 3He target

19
Milestones
  • Polarized 3He target
  • New oven for cell testing April 1, 2007
  • Vertical coils test June 1, 2007
  • Cell production 10 by July 1, 2007, 20 by Dec.
    1, 2007
  • Laser optics line Nov. 1, 2007
  • Complete system test Nov. 1, 2007
  • Ready for installation Jan. 1, 2008
  • Bigbite detectors
  • MWDC-1, MWDC-3 readout check May 30, 2007
  • MWDC-2 delivered to JLab June 10, 2007
  • Three chambers readout and tracking test Sept.
    1, 2007
  • Gas Cherenkov detector commissioning with
    cosmics Oct. 1, 2007
  • Integration of MWDC, Cherenkov, Pre/shower Dec.
    1, 2007
  • RICH
  • RICH frame ready Sept. 2, 2007
  • RICH assembled in Rome Nov. 16, 2007
  • RICH ready for installation Dec. 10, 2007

20
Safety issues
  • Safety at the detector lab and Hall-A
  • Laser, fire, high pressure cells, electric and
    magnetic fields, oven, radiation, hot surface
  • All safety documents will be updated
  • All necessary trainings will be arranged
  • We will work closely with the JLab safety
    officers to ensure that the proper procedures are
    in place

21
Summary
  • Significant progress has been made in the
    preparation for the Hall-A transversity
    experiments (Details are presented in later
    talks)
  • The responsibilities of the collaborating
    institutes have been clearly defined. Four Ph.D
    students on the transversity experiments are
    stationed at JLab.
  • The collaboration anticipates data-taking around
    March 2008. The first transversity measurement on
    polarzied 3He target should provide interesting
    new information on the novel nuclear structure
    functions and fragmentation function.
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