Neetika Sharma, A. Martínez Torres, K. P. Khemchandani, Harleen Dahiya
The magnetic moments of the negative parity S_{11}(1535) and S_{11}(1650) resonances have been calculated within the framework of the chiral constituent quark model. The explicit contributions coming from the spin and orbital angular momentum, including the effects of the configurations mixing between the states |N^2P_{1/2}> and |{N^4P_{1/2}}>, are obtained. The calculations have been further extended to determine the magnetic moment of the low-lying negative parity octet baryons. Since the chiral quark model incorporates the constituent quarks and Goldstone bosons as effective degrees of freedom, the effect of the presence of the meson cloud has also been discussed. Further, when the contributions of the "quark sea" to the spin and orbital angular momentum are added, we find interesting results.
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http://arxiv.org/abs/1207.3311
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