Eur. Phys. J. C (2004) 37: 315-321
https://doi.org/10.1140/epjc/s2004-02001-6

theoretical physics

B _K from the lattice with Wilson quarks

¹ Laboratoire de Physique Théorique (Bât.210), Université Paris Sud, Centre d’Orsay, 91405, Orsay-cedex, France
² Burjassot, Valéncia, Univ. de Valéncia, Dr. Moliner 50, 46100, Spain
³ Dip. di fisica, Univ. di Roma Tre and INFN, Sezione di Roma III, Via della Vasca Navale 84, 00146, Rome, Italy
⁴ NIC/DESY Zeuthen, Platanenallee 6, 15738, Zeuthen, Germany

Abstract

We report our results for the bag parameter B _K obtained from the quenched simulations on the lattice with Wilson fermions for three values of the lattice spacing. We implemented the method by which no subtraction of the mixing with other four-fermion operators is needed. Our final result, in terms of the renormalization group invariant bag parameter, is .