# Poster presented by Achim Bode

Poster Session

Topic: Theoretical Developments

### Two loop lattice expansion of the Schroedinger functional

Abstract: The contributions of the improved fermion action of Sheikholeslami and Wohlert to the two loop coefficient of the expansion of the Schr\"odinger functional coupling in terms of the lattice coupling is calculated for the SU(3). These coefficients are required for the second order relation of lattice data to the $\overline{MS}$-coupling. By taking all improvement coefficients into account we are able to improve the Schr\"odinger functional to two loop order.

Massimo Campostrini,   campo@mailbox.difi.unipi.it