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Polarized Structure Function $$\sigma_{LT'}$$ for $$p({\vec e},e'K^+)\Lambda$$ in the Nucleon Resonance Region

Journal Article · · Physical Review C
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The first measurements of the polarized structure function $$\sigma_{LT'}$$ for the reaction $$p(\vec e,e'K^+)\Lambda$$ in the nucleon resonance region are reported. Measurements are included from threshold up to $$W$$=2.05 GeV for central values of $Q^2$ of 0.65 and 1.00 GeV$^2$, and nearly the entire kaon center-of-mass angular range. $$\sigma_{LT'}$$ is the imaginary part of the longitudinal-transverse response and is expected to be sensitive to interferences between competing intermediate s-channel resonances, as well as resonant and non-resonant processes. The results for $$\sigma_{LT'}$$ are comparable in magnitude to previously reported results from CLAS for $$\sigma_{LT}$$, the real part of the same response. An intriguing sign change in $$\sigma_{LT'}$$ is observed in the high $Q^2$ data at $$W\approx 1.9$$ GeV. Comparisons to several existing model predictions are shown.
Research Organization:
Thomas Jefferson Lab National Accelerator Facility
Sponsoring Organization:
USDOE
OSTI ID:
955830
Report Number(s):
JLAB-PHY-08-772; arXiv:0801.4711; DOE/OR/23177-0326
Journal Information:
Physical Review C, Journal Name: Physical Review C Vol. 77; ISSN 0556-2813; ISSN PRVCAN
Country of Publication:
United States
Language:
English

References (48)

Electroproduction of strangeness above the resonance region journal January 2000
Hyperon photoproduction in the nucleon resonance region journal April 2004
Separation of the longitudinal and transverse cross sections in the 1 H ( e , e ′ K + ) Λ and 1 H ( e , e ′ K + ) Σ 0 reactions journal May 2003
Coincidence Measurements of Single K + Electroproduction journal April 1972
Exclusive electromagnetic production of strangeness on the nucleon: Regge analysis of recent data journal November 2003
Ratio of σ L / σ T for p ( e , e ' K + ) Λ extracted from polarization transfer journal June 2005
Photo- and electroproduction of eta mesons journal September 1995
Quasi-two-body decays of nonstrange baryons journal May 1994
Baryon decays in a quark model with chromodynamics journal April 1980
The γ → p → K + Λ and γ → p → K + Σ 0 reactions at forward angles with photon energies from 1.5 to 2.4 GeV journal March 2006
Longitudinal and Transverse Cross Sections in the 1 H ( e , e ′ K + ) Λ Reaction journal August 1998
Measurement of γp→K+Λ and γp→K+Σ0 at photon energies up to 2 GeV journal December 1998
Separated structure functions for the exclusive electroproduction of K + Λ and K + Σ 0 final states journal April 2007
The CLAS forward electromagnetic calorimeter
  • Amarian, M.; Asryan, G.; Beard, K.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 460, Issue 2-3 https://doi.org/10.1016/S0168-9002(00)00996-7
journal March 2001
N π decays of baryons in a relativized model journal March 1993
First measurement of beam-recoil observables C x and C z in hyperon photoproduction journal March 2007
Study of nucleon resonances with electromagnetic interactions journal May 2007
On an exact calculation of the lowest-order electromagnetic correction to the point particle elastic scattering journal September 1977
Nuclear response in electromagnetic interactions with complex nuclei journal April 1993
Scalar-transverse separation of electroproduced K + Λ and K + Σ 0 final states journal June 1977
The CEBAF large acceptance spectrometer (CLAS)
  • Mecking, B. A.; Adams, G.; Ahmad, S.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 503, Issue 3 https://doi.org/10.1016/S0168-9002(03)01001-5
journal May 2003
Structure functions in nucleon emission by polarized electrons journal March 1985
Electroproduction of ?+ n, ?- p andK + ?,K + 2211; 0 final states above the resonance region journal June 1979
Gauge-invariant tree-level photoproduction amplitudes with form factors journal July 1998
The CLAS drift chamber system
  • Mestayer, M. D.; Carman, D. S.; Asavapibhop, B.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 449, Issue 1-2 https://doi.org/10.1016/S0168-9002(00)00151-0
journal July 2000
Quasifree kaon photoproduction on nuclei journal December 2001
Evidence for a missing nucleon resonance in kaon photoproduction journal November 1999
Beam-Polarization Asymmetries for the p ( γ → , K + ) Λ and p ( γ → , K + ) Σ 0 Reactions for E γ = 1.5 – 2.4     G e V journal August 2003
Dynamical coupled-channel model of kaon-hyperon interactions journal June 2004
Electroproduction of K + mesons along the virtual-photon direction journal February 1977
QED radiative corrections in processes of exclusive pion electroproduction journal October 2002
Partial-wave decomposition of pion and photoproduction amplitudes journal February 2005
Differential cross sections for γ + p → K + + Y for Λ and Σ 0 hyperons journal March 2006
Photoproduction of baryons decaying into Nπ and Nη journal September 2005
The time-of-flight system for CLAS
  • Smith, E. S.; Carstens, T.; Distelbrink, J.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 432, Issue 2-3 https://doi.org/10.1016/S0168-9002(99)00484-2
journal August 1999
Decays of baryon resonances into ΛK+, ΣK+ and Σ+K0 journal September 2005
Coupled-channel analysis of K Λ production in the nucleon resonance region journal July 2005
Pion and kaon photoproduction at high energies: forward and intermediate angles journal December 1997
Regge-plus-resonance treatment of the p ( γ , K + ) Σ 0 and p ( γ , K 0 ) Σ + reactions at forward kaon angles journal April 2007
Measurement of $\gamma p \rightarrow K^ + \Lambda$ and $\gamma p \rightarrow K^ + \Sigma^0$ at photon energies up to 2.6 GeV journal February 2004
Electroproduction of K + Mesons in the Forward Direction journal January 1974
Dynamical coupled-channels approach to hadronic and electromagnetic kaon-hyperon production on the proton journal May 2006
The CLAS Cherenkov detector
  • Adams, G.; Burkert, V.; Carl, R.
  • Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, Vol. 465, Issue 2-3 https://doi.org/10.1016/S0168-9002(00)01313-9
journal June 2001
Electroproduction of kaons from the proton in a Regge-plus-resonance approach journal November 2007
Strange decays of nonstrange baryons journal September 1998
First Measurement of Transferred Polarization in the Exclusive e → p → e ′ K + Λ → Reaction journal April 2003
Production of hyperons by virtual photons journal August 1975
Measurement of the Pion Form Factor journal November 1967

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