Single p 0 Electroproduction in the Resonance Region with CLAS
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Transcript of Single p 0 Electroproduction in the Resonance Region with CLAS
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Single Single 00 Electroproduction in the Electroproduction in the Resonance Region with CLASResonance Region with CLAS
Kyungseon Joo
University of Connecticut
For the CLAS Collaboration
N* 2009
Beijing, China
April 19, 2009
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SU(6)xO(3) Classification of Low Lying N*
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p(e,e’)X
Exclusive Processes in N* StudiesCLAS
Hadronic mass
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N* Transition Form Factors in the 2nd N* Transition Form Factors in the 2nd Resonance Region –Resonance Region –
“Roper” P11(1440), S11(1535), D13(1520)
Transition Form Factors of Low Lying N* States
p0 channel is important to study:
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Roper P11(1440) Helicity amplitudes
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Transverse amplitudes for p->D13(1520)
preliminar
y
preliminar
y
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CLAS Single Pion Electro-production DataCLAS Single Pion Electro-production Data
Data in the region up to W = 1.4 GeV
JLab/Hall C Frolov 1999 p0 Q² = 2.5 - 4.3 GeV²
Bates Mertz et al. 2001 p0 Q² = 0.127 GeV²
Mainz Pospischil et al. 2001 p0 Q² = 0.127 GeV²
JLab/CLAS Joo et al. 2002 p0 Q² = 0.4 – 1.8 GeV²
Bonn Bantes, Gothe 2002 p0 Q² = 0.6 GeV²
JLab/CLAS Egiyan et al. 2006 n+ Q² = 0.3 – 0.6 GeV²
Mainz Elsner et al. / Stave et al.
2006 p0 Q² = 0.05-0.2 GeV²
Jlab/CLAS Ungaro et al. 2006 p0 Q² = 3.0 – 6.0 GeV²
JLab/Hall A Kelly et al. 2007 p0 Q² = 1.0 GeV²
JLab/CLAS Park et al. 2008 n+ Q² = 3.0 – 6.0 GeV²
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CLAS Single Pion Electro-production DataCLAS Single Pion Electro-production Data
Data up to the 3rd resonance region up to W = 1.7 GeV
JLab/CLAS Joo et al. (Ae only)
2003 p0 Q² = 0.4 – 0.65 GeV²
JLab/CLAS Joo et al. (Ae only)
2004 n+ Q² = 0.4 - 0.65 GeV²
JLab/Hall A Laveissiere et al. 2004 p0 Q² = 1.0 GeV²
JLab/CLAS Egiyan et al. 2006 n+ Q² = 0.3 – 0.6 GeV²
JLab/CLAS Park et al. 2008 n+ Q² = 1.7 – 4.5 GeV²
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CLAS Single CLAS Single 00 Electro-production Data Analysis Electro-production Data Analysis
• E1E: • Beam Energy:1 GeV and 2 GeV • Low Q2 up to 1.5 GeV, and W up to 1.7 GeV
•E1-6: • Beam Energy: 5.75 GeV • Low Q2, up to 4.5 GeV and W up to 2.0 GeV
• Beam polarization: ~ 70 – 80 %
• Target: Liquid Hydrogen
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CEBAF at Jefferson Lab
Emax ~ 6 GeV
Imax ~ 200 A
Duty Factor ~ 100% E/E ~ 2.5
10-5
Beam P ~ 80%E(tagged) ~ 0.8- 5.5 GeV
CLASA CB
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CEBAF Large Acceptance Spectrometer (CLAS)
/q e e
p
/e •Six identical sectors
•5 T toroidal B-field
•Δθ=15-140 degrees
•Δφ = 0-50 degrees
•Δp/p = 10-2-10-3
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Electron PIDElectron PID
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Electron PIDElectron PID
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Proton PIDProton PID
Use TOF timing and DC momentum of positive tracks
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00 selection selection e + p -> e’ + p + X on resonance region from 5.7 GeV
MX2
MX2 from e + p -> e’ + p + X
on resonance region from 2. 0 GeV
MX2
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00 selection (E1-6) selection (E1-6)
MX2 from e + p -> e’ + p + X
for 1.1 < W < 2.0 GeVM
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MX2
Currently working on bench-mark studies on (1232) region with/without tagging 0
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Typical ep→ e’pπ0 cross sections vs cos θ* and φ*
Q2 = 0.2 GeV2 W=1.22 GeV
Very preliminary
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π+ electroproduction at Q2=0.20 GeV2 using CLAS
Very preliminary
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0.6 < Q2 < 0.7, 1.3 < W < 1.35
Differential Cross section from 2.0 GeV Differential Cross section from 2.0 GeV
Very preliminary
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2
0
)(cosi
iiiLT PA
0.6 < Q2 < 0.7
Legendre MomentLegendre Moment
Very preliminaryA0
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E1+/M1+ and S1+/M1+
pπ0 only
nπ+ only
pπ0 and nπ+
CLAS e1e UIM Fit
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Roper P11(1440) Helicity amplitudes
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Transverse amplitudes for p->D13(1520)
preliminar
y
preliminar
y
+
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Summary
• Single electro-production analysis is under way for low and high Q2 range up to 2.0 GeV in W.
• Able to perform combined analysis with n+ and two pion channels
•p channel is an important part of 12 GeV N* program with CLAS12.
• Current p analysis measuring all final states will provide an important step for 12 GeV N* program.