Quark model for photoproduction of baryons

Gupta, Sutapa Das ; Mitra, A. N. (1967) Quark model for photoproduction of baryons Physical Review, 156 (5). pp. 1581-1584. ISSN 0031-899X

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Official URL: http://prola.aps.org/abstract/PR/v156/i5/p1581_1

Related URL: http://dx.doi.org/10.1103/PhysRev.156.1581


A quark (Q) model of photoproduction of positive- and negative-parity baryons in association with a meson octet is proposed. According to this model, the basic mechanism for photoproduction is represented by a U-spin-invariant process γ+Q→Q+π at each quark, π being a meson octet. The matrix elements of this basic amplitude are taken between appropriate 3Q states representing the initial proton and a final baryon, according to the multiplet structure 56+ of SU(6) and (70,(70,3)- of SU(6)⊗O(3) for the positive-parity and negative-parity baryonic states, respectively. The SU(3) sum rules based on U-spin invariance of the amplitudes are verified. Several additional sum rules, valid separately for spin-flip and non-spin-flip amplitudes, are derived for the 56+ states. For the negative-parity states, a number of nontrivial sum rules connecting different SU(3) multiplets are obtained.

Item Type:Article
Source:Copyright of this article belongs to The American Physical Society.
ID Code:34437
Deposited On:09 Apr 2011 06:42
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