20,258 research outputs found
Parity-violating coupling constant from the flavor-conserving effective weak chiral Lagrangian
We investigate the parity-violating pion-nucleon-nucleon coupling constant
, based on the chiral quark-soliton model. We employ an effective
weak Hamiltonian that takes into account the next-to-leading order corrections
from QCD to the weak interactions at the quark level. Using the gradient
expansion, we derive the leading-order effective weak chiral Lagrangian with
the low-energy constants determined. The effective weak chiral Lagrangian is
incorporated in the chiral quark-soliton model to calculate the
parity-violating constant . We obtain a value of about
at the leading order. The corrections from the next-to-leading order
reduce the leading order result by about 20~\%.Comment: 12 page
An Asymptotic Comparison of Two Time-homogeneous PAM Models
Both Wick-Ito-Skorokhod and Stratonovich interpretations of the parabolic
Anderson model (PAM) lead to solutions that are real analytic as functions of
the noise intensity e, and, in the limit e->0, the difference between the two
solutions is of order e^2 and is non-random.Comment: 12 page
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