In an AMSB SQCD model with F=N=3, the chiral Lagrangian coefficients predict a dynamical up quark mass ratio mu_u/mu_d of order one, while the effect is suppressed for F<N.
$N_f=1+2$ mass dependence of the topological susceptibility
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abstract
A massless up quark has long been proposed as a solution to the strong CP problem. While this solution is sometimes thought to have been excluded, it is actually still ill-defined. In this work, we study the mass dependence of the physical observable $\chi_t$, the topological susceptibility. Assigning an unphysically large value to the down mass allows to be more sensitive to the non-perturbative effects behind the $m_u=0$ ambiguity. Preliminary results are presented for four masses of clover fermions.
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Dynamical Up-quark Mass Generation in QCD-like theories
In an AMSB SQCD model with F=N=3, the chiral Lagrangian coefficients predict a dynamical up quark mass ratio mu_u/mu_d of order one, while the effect is suppressed for F<N.