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

• Authors: Vladimir Neudatchin , Igor Obukhovsky , Ludmila Sviridova , Nikolai Yudin
• Languages of publication: EN

Abstracts

EN

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).

Keywords

EN

pions in nucleon; nucleon quark models; momentum distributions; pion electroproduction; 12.39.Fe; 12.39.Jh; 13.60.Le; 14.20.Dh

• Publisher: De Gruyter Open
• Journal: Open Physics
• Year: 2004
• Volume: 2
• Issue: 3
• Pages: 511-522

Dates

published

1 - 9 - 2004

online

1 - 9 - 2004

Contributors

author

Vladimir Neudatchin

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

author

Igor Obukhovsky

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

author

Ludmila Sviridova

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

author

Nikolai Yudin

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

References

• [1] A. Le Yaouanc, L. Oliver, O. Péne, and J. Raynal: “Strong decay of Ψ'(4.028) as a radial excitation of charmonium”, Physics Letters, Vol. 71B, (1977), pp. 397–399; A. Le Yaouanc, L. Oliver, O. Péne, and J. Raynal: “Why is Ψ(4.414) so narrow?”, Physics Letters, Vol. 72B, (1977), pp. 57–61.
• [2] S. Godfrey and N. Isgur: “Mesons in a relativized quark model with chromodynamics”, Physical Review D, Vol.32, (1985), pp.189–231; E.S. Ackleh, T.D. Barnes and E.S. Swanson: “On the mechanisms of spin-flavor strong decay”, Physical Review D, Vol. 54, (1996), pp. 6811–6829. http://dx.doi.org/10.1103/PhysRevD.32.189[Crossref]
• [3] P. Stassart and Fl. Stancu: “N+p decay of baryons in a flux-tube-breaking mechanism”, Physical Review D, Vol.42, (1990), pp.1521–1526. http://dx.doi.org/10.1103/PhysRevD.42.1521[Crossref]
• [4] B. Desplanques, C. Gignoux, B. Silvestre-Brac et al.: “The baryonic spectrum in a constituent quark model including a three-body force”, Zeitschrift fur Physik A, Vol. 343, (1992), pp. 331–336; http://dx.doi.org/10.1007/BF01291532[Crossref]
• [5] F. Cano, P. Gonzalez, S. Noguera, B. Desplanques: “Strong pionic decays of baryons from a spectroscopic quark model”, Nuclear Physics A, Vol.603, (1996), pp.257–280; http://dx.doi.org/10.1016/0375-9474(96)80002-9[Crossref]
• [6] P.J.A. Bicudo, L.S. Ferreira, C.M. Placido, J. Ribeiro: “Republsive core ofN N S-wave scattering in a quark model with a condensed vacuum”, Physical Review C, Vol.56, (1997), pp.670–678. http://dx.doi.org/10.1103/PhysRevC.56.670[Crossref]
• [7] F. Cano, B. Desplanques, P. Gonzalez, S. Noguera: “Nucleon electromagnetic form factors in a relativistic quark-pair-creation model”, Nuclear Physics A, Vol.689, (2001), pp.493c-496c. http://dx.doi.org/10.1016/S0375-9474(01)00889-2[Crossref]
• [8] I.T. Obukhovsky, A. Faessler, G. Wagner, and A.J. Buchmann: “π NN decay of a possibled' dibaryon in the3P 0 quark pair creation model”, Physical Review C, Vol. 60, (2000), pp. 035207. http://dx.doi.org/10.1103/PhysRevC.60.035207
• [9] I.T. Obukhovsky, V.G. Neudatchin, L.L. Sviridova, N.P. Yudin: “Quasielastic knockout of kaons from proton and momentum distribution of virtual kaons in proton”, Yadernaya Fizika, Vol.66, (2003), pp.2233–2238.
• [10] V.G. Neudatchin, A.A. Sakharuk, V.V. Kurovsky, Yu.M. Tchuvil'sky: “Hidden” world of virtually excited clusters in atomic nuclei and its possible observation in the reaction of cluster quasielastic knockout by 1 GeV protons”, Physical Review C, Vol.50, (1994), pp.148–163. http://dx.doi.org/10.1103/PhysRevC.50.148[Crossref]
• [11] D.O. Riska, G.E. Brown: “Nucleon resonance transition couplings to vector mesons”, Nuclear Physics A, Vol.679, (2001), pp.577–596. http://dx.doi.org/10.1016/S0375-9474(00)00362-6[Crossref]
• [12] V.G. Neudatchin, N.P. Yudin and L.L. Sviridova: “The quasielastic knockout of pions from nucleons by high-energy electrons in the exclusive experiment as the method of investigation of the nucleon pionic structure”, Yadernaya Fizika, Vol. 60, (1997), pp. 2020–2027; V.G. Neudatchin, N.P. Yudin and L.L. Sviridova: “On the probing of rho-meson cloud of nucleon by means of pion quasielastic knockout process”, Vol. 61, (1999), pp. 1689–1695; V.G. Neudatchin, N.P. Yudin and L.L. Sviridova: “The study of omega-meson could of nucleon by means of quasielastic knockout of neutral pions from the nucleon by high-energy electrons”, Vol. 62, (1999), pp. 694–696; V.G. Neudatchin, N.P. Yudin and L.L. Sviridova: “Probing the mesonic structure of the nucleon by means of exclusive reactions of quasielastic pion knockout in (e, e′ p) reactions at high enegries”, Vol. 64, (2001), pp. 1680–1697; V.G. Neudatchin, N.P. Yudin and L.L. Sviridova: “Possibilities of investigation pionic degrees of freedom in nuclei by quasielastic pion knockout with high-energy electrons”, Vol. 65, (2002), pp. 1598–1600.
• [13] V.G. Neudatchin, I.T. Obukhovsky, L.L. Sviridova, and N.P. Yudin: “Quasielastic knockout of pions and kaons from nucleons by high-energy electrons and quark microscopics of soft mesonic degrees of freedom in the nucleon”, arXiv: nuclth/04010162.
• [14] R. Machleidt and I. Slaus: “The nucleon-nucleon interaction (topical review)”, Journal of Physics G: Nucl. Part. Phys, Vol. 27, (2001), pp. R69-R108. http://dx.doi.org/10.1088/0954-3899/27/5/201[Crossref]
• [15] P. Brauel, T. Canzler, D. Cords, et al.: “Electroproduction of π+nπ- andK + ν, K −ν final states above the resonance region”, Zeitschrift fur Physik C: Particles and Fields, Vol.3, (1979), pp.101–123; C.J. Bebek, C.N. Brown, S.D. Holmes, et al.: “Electroproduction of single pions at low ∈ and a measurement of the pion form factor up toQ 2=10 GeV2”, Physical Review D, Vol. 17, (1978), pp. 1693–1705; J. Volmer, D. Abbott, H. Anklin, et el.: “Measurement of the charged pion electromagnetic form factor”, Physical Review Letters D, Vol. 86, (2001), pp. 1713–1716. http://dx.doi.org/10.1007/BF01443698

Identifiers

DOI

10.2478/BF02476429