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2004 | 2 | 3 | 511-522
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The exclusive reaction of pion quasi-elastic knockout from nucleon p(e, e′ π)B to various states of the final baryon-spectator B and the quark models for the pion cloud of nucleon

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The pion momentum distributions (MDs) in four channels of virtual decay p→B+π, B = N, Δ, N 1/2-(1535), N 1/2+(1440) are calculated in two models, the microscopic model of 3 P 0 scalar q−q fluctuation with the pion as a composite q−q-system and the chiral semi-microscopic model of πq interaction with the pion as a structureless Goldstone boson. The results of the above models are similar for the baryon states B = N, Δ, N 1/2-(1535) but are rather different for the Roper resonance N 1/2+(1440) which corresponds to excitation of two oscillator quanta in the nucleon. The experimental investigation of pion MDs by means of the reaction of quasi-elastic knockout of pion by an electron of a few GeV energy p(e, e′ π)B may be very suitable for Jefferson Laboratory, Virginia (JLab).

Opis fizyczny
  • Institute of Nuclear Physics, Moscow State University, Leninskie Gory, 119899, Moscow, Russia
  • Institute of Nuclear Physics, Moscow State University, Leninskie Gory, 119899, Moscow, Russia
  • Institute of Nuclear Physics, Moscow State University, Leninskie Gory, 119899, Moscow, Russia
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