Delta-->Ngamma in large-N(c) QCD.
The decay Delta(+)-->pgamma is studied in the 1/N(c) expansion of QCD. The ratio of the helicity amplitudes is determined to be A(3/2)/A(1/2)=sqrt[3]+O(1/N(2)(c)). Equivalently, the ratio E2/M1 of the multipole amplitudes is predicted to be order 1/N(2)(c).
Jenkins
Elizabeth
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University of California, San Diego, 9500 Gilman Drive, La Jolla 92093-0319, USA. ejenkins@ucsd.edu
Ji
Xiangdong
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Manohar
Aneesh V
AV