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High Luminosity Spectrometer for PVDIS in JLab Hall A

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High Luminosity Spectrometer for PVDIS in JLab Hall A Rutgers town meeting PVDIS and Hadronic Structure High acceptance/ high luminosity Spectrometer for Hall A at ... – PowerPoint PPT presentation

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Title: High Luminosity Spectrometer for PVDIS in JLab Hall A


1
High Luminosity Spectrometer for PVDIS in JLab
Hall A
  • Rutgers town meeting

2
PVDIS and Hadronic Structure
For PVDIS
2H and Charge Symmetry
See quark-quark Correlation In higher twist
Measure d/u For 1H
Higher Twist
No nuclear Correction
Need multiple sub- APV measurements at
numerous x-Q2 bins
3
High acceptance/ high luminosity Spectrometer for
Hall A at JLab
Price10M
x y Q2 p d
Higher twist Yes No Yes X
CSV Yes? No No X
d/u Yes No No X
SM Test No Yes No X
Projected fractional APV errors in
Kinematic coverage
60 days ea. 8.8 and 11 GeV
4
Backups
5
Observables in Asymmetries for PV e- DIS
e-
e-
?
Z
X
N
fi(x) are quark distribution functions
For an isoscalar target like 2H, structure
functions largely cancel in the ratio
(2C2u-C2d)/(2C1u-C1d)0.136
Especially for xgt0.5 or so
APV becomes independent of x, Q2, W, and depends
only on y
6
Untangle Many Topics in Hadronic and Electroweak
Physics
x y Q2 p d
Higher twist Yes No Yes X
CSV Yes? No No X
d/u Yes No No X
SM Test No Yes No X
Higher Twist
Need many points with lt0.5 precision
See quark-quark correlation
7
Charge Symmetry Violation in PV DIS
For APV in e--2H DIS (dAPV0 without CSV)
  • u-d mass difference
  • electromagnetic effects
  • Direct observation of parton-level CSV would be
    very exciting!
  • Important implications for high energy collider
    pdfs
  • Could explain significant portion of the NuTeV
    anomaly

8
High acceptance/ high luminosity Spectrometer
forHall A at JLab
CDF or BaBar Solenoid?
Price10M
9
PV for e--Nucleon Has Four Couplings
C1s are large and precisely measured (key to
measuring hadronic structure)
C2s are small but poorly measured (almost
virgin territory for Standard Model test)
10
Kinematic acceptance
Large angles required for large x
Wgt2
Good resolution needed to maintain integrity of
the bins
?gt35o
Tlt20o
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