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LT Separated Kaon production Cross Sections from 511 GeV. P. Bosted, S. Covrig, H. Fenker, R. Ent, D. Gaskell, T. Horn* , M. Jones, J. LeRose, D. Mack, G.R. Smith, S. Wood, G. Huber , A. Semenov, Z. Papandreou, W. Boeglin, P. Markowitz , B. Raue, J. Reinhold, F. Klein,
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LT Separated Kaon production Cross Sections from 511 GeV
P. Bosted, S. Covrig, H. Fenker, R. Ent, D. Gaskell, T. Horn*, M. Jones,
J. LeRose, D. Mack, G.R. Smith, S. Wood, G. Huber, A. Semenov,
Z. Papandreou, W. Boeglin, P. Markowitz, B. Raue, J. Reinhold, F. Klein,
P. NadelTuronski, A. Asaturyan, A. Mkrtchyan, H. Mkrtchyan, V. Tadevosyan, D. Dutta, M. Kohl, P. Monaghan, L. Tang, D. Hornidge, A. Sarty,
E. Beise, G. Niculescu, I. Niculescu, K. Aniol, E. Brash, V. Punjabi,
C. Perdrisat, Y. Ilieva, F. Cusanno, F. Garibaldi, M. Iodice, S. Marrone,
P. King, J. Roche
JLab, Regina, FIU, CUA, Yerevan, Mississippi, Hampton, Mount Allison, Saint Mary’s, UMd, JMU, California State, CNU, Norfolk, W&M, South Carolina, INF, Ohio
Hall C User’s meeting
30 January 2009
e’
e
Q2
π, K, etc.
W
t
N(p’)
N(p)
tchannel process
π, K, etc.
hard
pointlike
handbag

π, K, etc
φ
φ
Fπ,K
π,K
π, K, etc.
φ
Hard Scattering
GPD
Hall C 6 GeV data (W=1.84 GeV)
K+Λ
K+Σ˚
σL
0.5<Q2<2.0 GeV2
VGL/Regge
σT
K+Λ
K+Σ˚
High quality σL and σT data for both kaon and pion would provide important information for understanding the meson reaction mechanism
VGL/Regge (Λ2K=0.68 GeV2)
Nucleon resonance data scaled to W=1.84 GeV
L/T separations above the resonance region are essential for building reliable models, which are also needed for form factor extractions
Hall C p+ production data at 6 GeV
Q2=2.73.9 GeV2
Q2=1.42.2 GeV2
σL
σT
T. Horn et al., Phys. Rev. C78, 058201 (2008)
Kaon production data would allow for a quasi modelindependent comparison that is more robust than calculations based on QCD factorization and present GPD models
Bonus: Fπ,K  a factorization puzzle?
T. Horn et al., Phys. Rev. Lett. 97 (2006) 192001.
T. Horn et al., arXiv:0707.1794 (2007).
A.P. Bakulev et al, Phys. Rev. D70 (2004)]
Comparing the observed Q2 dependence of σL,T and FFmagnitude with kaon production would allow for better understanding of the onset of factorization
Experiment Overview
Q2=3.0 GeV2 was optimized to be used for both tchannel and Qn scaling tests
Cross Section Separation
Low ε
High ε
SHMS+3°
SHMS3°
Radial coordinate (t),
Azimuthal coordinate (φ)
Heavy Gas Cherenkov and 60 cm of empty space
TOF
Kaon 12 GeV Kinematics
π/K Discrimination power
Heavy Gas Cerenkov
Momentum (GeV/c)
e+p→e’+K+Λ(Σ°)
Λ
SHMS+HMS
Σ°
Simulation at Q2=2.0 GeV2 , W=3.0 and high ε
VGL/Regge calculation
Hall C parameterization
VGL/Regge
Fπ param
σL
σT
PR1209011:
Precision data for W > 2.5 GeV
Projected Uncertainties for the Kaon FF
Projected Uncertainties for Qn scaling
p(e,e’K+)Λ
xB=0.25
1/Q4
1/Q6
Fit: 1/Qn
1/Q8
Is onset of scaling different for kaon than pion?
Kaons and pions together provide quasi modelindependent study
Request 47 days to provide first precision L/T separated kaon production data above the resonance region. Excellent candidate for early running.
Backup material
Overlap with pion data
Proposed kaon experiment
Approved pion experiments
VGL σL
VGL σT
T. Horn et al., Phys. Rev. Lett. 97, 192001 (2006)
K+Λ(Σ°) as calculated in VGL/Regge model
Q2=0.4 GeV2
Q2=3.5 GeV2