Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2010-06-06
Int.J.Mod.Phys.A26:947-963,2011
Physics
High Energy Physics
High Energy Physics - Phenomenology
13 pages, 12 figures
Scientific paper
10.1142/S0217751X11051561
We study the $\eta$NN coupling constant using the method of QCD sum rules starting from the vacuum-to-eta correlation function of the interpolating fields of two nucleons. The matrix element of this correlation has been taken with respect to nucleon spinors to avoid unwanted pole contribution. The SU(3)-flavor symmetry breaking effects have been accounted for via the $\eta$-mass, s-quark mass and eta decay constant to leading order. Out of the four sum rules obtained by taking the ratios of the two sum rules in conjunction with the two sum rules in nucleon mass, three are found to give mutually consistent results. We find the SU(3) breaking effects significant, as large as 50% of the SU(3) symmetric part.
Lee Frank X.
Singh Janardan P.
Wang Lanjuan
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