K. Joo
Thomas Jefferson National Accelerator Facility
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Featured researches published by K. Joo.
Physics Letters B | 2008
H. Mkrtchyan; P. Bosted; G. S. Adams; A. Ahmidouch; T. Angelescu; J. Arrington; R. Asaturyan; Oliver Keith Baker; N. Benmouna; C. Bertoncini; H.P. Blok; W. Boeglin; H. Breuer; M. E. Christy; Simon Henry Connell; Y. Cui; M. M. Dalton; S. Danagoulian; D. Day; T. Dodario; J. A. Dunne; D. Dutta; N. El Khayari; R. Ent; H. Fenker; V. V. Frolov; L. Gan; D. Gaskell; K. Hafidi; W. Hinton
Abstract Cross sections for semi-inclusive electroproduction of charged pions ( π ± ) from both proton and deuteron targets were measured for 0.2 x 0.5 , 2 Q 2 4 GeV 2 , 0.3 z 1 , and P t 2 0.2 GeV 2 . For P t 0.1 GeV , we find the azimuthal dependence to be small, as expected theoretically. For both π + and π − , the P t dependence from the deuteron is found to be slightly weaker than from the proton. In the context of a simple model, this implies that the initial transverse momenta width of d quarks is larger than for u quarks and, contrary to expectations, the transverse momentum width of the favored fragmentation function is larger than the unfavored one.
Physical Review C | 1998
G. Warren; R. Alarcon; C. Armstrong; B. Asavapibhop; D. Barkhuff; W. Bertozzi; V. D. Burkert; Jiunn-Wei Chen; J. P. Chen; D. Dale; G. Dodson; S. Dolfini; K. Dow; M. B. Epstein; M. Farkhondeh; J. M. Finn; S. Gilad; R. W. Gothe; X. Jiang; M. K. Jones; K. Joo; A. Karabarbounis; J. J. Kelly; S. Kowalski; C. Kunz; D. Liu; R. W. Lourie; R. Madey; D. J. Margaziotis; P. Markowitz
We present a measurement of the induced proton polarization P{sub n} in {pi}{sup 0} electroproduction on the proton around the {Delta} resonance. The measurement was made at a central invariant mass and a squared four-momentum transfer of W = 1231 MeV and Q{sup 2} = 0.126 GeV{sup 2}/c{sup 2}, respectively. We measured a large induced polarization, P{sub n} = -0.397 {+-} 0.055 {+-} 0.009. The data suggest that the scalar background is larger than expected from a recent effective Hamiltonian model.
Physical Review Letters | 2007
T. Navasardyan; G. S. Adams; A. Ahmidouch; T. Angelescu; J. Arrington; R. Asaturyan; O. K. Baker; N. Benmouna; C. Bertoncini; H.P. Blok; W. Boeglin; P. E. Bosted; H. Breuer; M. E. Christy; Simon Henry Connell; Y. Cui; M. M. Dalton; S. Danagoulian; D. Day; T. Dodario; J. A. Dunne; D. Dutta; N. El Khayari; R. Ent; H. Fenker; V. V. Frolov; L. Gan; D. Gaskell; K. Hafidi; W. Hinton
A large data set of charged-pion (pi+/-) electroproduction from both hydrogen and deuterium targets has been obtained spanning the low-energy residual-mass region. These data conclusively show the onset of the quark-hadron duality phenomenon, as predicted for high-energy hadron electroproduction. We construct several ratios from these data to exhibit the relation of this phenomenon to the high-energy factorization ansatz of electron-quark scattering and subsequent quark-->pion production mechanisms.
Physical Review C | 2003
K. Joo; Angela Biselli
The polarized longitudinal-transverse structure function
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