NDLI: The role of the qqqq $ \bar{{q}}$ components in the electromagnetic transition $ \gamma^{{*}}

Content Provider	Springer Nature Link
Author	An, C. S. Zou, B. S.
Copyright Year	2009
Abstract	The helicity amplitudes A p 1/2 and S p 1/2 for the electromagnetic transition $ \gamma^{{}}_{}$ N → N (1535) are calculated in the quark model that is extended to include the lowest-lying qqqq $ \bar{{q}}$ components in addition to the qqq component. It is found that with admixture of 5-quark components with a proportion of 20% in the nucleon and 25-65% in the N (1535) -resonance the calculated helicity amplitude A p 1/2 decreases at the photon point, Q 2 = 0 to the empirical range. The qqqq $ \bar{{q}}$ components contain s $ \bar{{s}}$ pairs, which is consistent with the substantial width for N $ \eta$ decay of the N (1535) . The best description of the momentum dependence of the empirical helicity amplitudes is obtained by assuming that the qqqq $ \bar{{q}}$ components are more compact than the qqq component. However, this version of the extended quark model still does not lead to a satisfactory simultaneous description of both A p 1/2 and S p 1/2 although with significant improvement.
Starting Page	195
Ending Page	204
Page Count	10
File Format	PDF
ISSN	14346001
Journal	The European Physical Journal A - Hadrons and Nuclei
Volume Number	39
Issue Number	2
e-ISSN	1434601X
Language	English
Publisher	Springer-Verlag
Publisher Date	2009-01-22
Publisher Place	Berlin, Heidelberg
Access Restriction	One Nation One Subscription (ONOS)
Subject Keyword	Nuclear Fusion Elementary Particles and Nuclei Nuclear Physics, Heavy Ions, Hadrons
Content Type	Text
Resource Type	Article
Subject	Nuclear and High Energy Physics

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