Nonrelativistic bound states are studied using an effective field theory. Large logarithms in the effective theory can be summed using the velocity renormalization group. For QED, one can determine the structure of the leading and next-to-leading order series for the energy, and compute corrections up to order α ln α, which are relevant for the present comparison between theory and experiment. ...

This paper is about higher-order theory of mind such as “I think that you think that I think ...”. Previous studies have argued that using higher-order theory of mind in the context of strategic games is difficult and cognitively demanding. In contrast, we claim that performance depends on task properties such as instruction, training, and procedure of asking for social reasoning. In an experim...

A possible experimental determination of m s / ˆ m from K µ4 decays Abstract Kπ scattering and K µ4 decays are studied at leading order of improved chiral perturbation theory. It is shown that high precision K µ4 experiments at, e.g., DAΦNE should allow for a direct measurement of the quark mass ratio m s / ˆ m.