We present the results of an extensive non-perturbative calculation of the renormalization constants of bilinear quark operators,for the non-perturbatively O(a)-improved Wilson action. The results are obtained at four values of the lattice coupling, by using the RI/MOM and the Ward identities methods. A new non-perturbative,renormalization technique, which is based on the study of the lattice correlation functions at short distance in x-space, is also numerically investigated. We then use our non-perturbative determination of the quark mass renormalization constants to compute the values of the strange and the average up/down quark masses. After performing an extrapolation to the continuum limit, we obtain m<((MS)(s))over bar>ms(2 GeV) = (106 +/- 2 +/- 8) MeV and m<((MS)(l))over bar>(2 GeV) = (4.4 +/- 0.1 +/- 0.4) MeV.
Non-perturbative renormalization constants and light quark masses / D., Becirevic; V., Gimenez; V., Lubicz; Martinelli, Guido; Papinutto, MAURO LUCIO; J., Reyes; C., Tarantino. - In: NUCLEAR PHYSICS B-PROCEEDINGS SUPPLEMENTS. - ISSN 0920-5632. - 119:(2003), pp. 442-445. ( 20th International Symposium on Lattice Field Theory CAMBRIDGE, MASSACHUSETTS JUN 24-29, 2002) [10.1016/s0920-5632(03)01580-9].
Non-perturbative renormalization constants and light quark masses
MARTINELLI, Guido;PAPINUTTO, MAURO LUCIO;
2003
Abstract
We present the results of an extensive non-perturbative calculation of the renormalization constants of bilinear quark operators,for the non-perturbatively O(a)-improved Wilson action. The results are obtained at four values of the lattice coupling, by using the RI/MOM and the Ward identities methods. A new non-perturbative,renormalization technique, which is based on the study of the lattice correlation functions at short distance in x-space, is also numerically investigated. We then use our non-perturbative determination of the quark mass renormalization constants to compute the values of the strange and the average up/down quark masses. After performing an extrapolation to the continuum limit, we obtain m<((MS)(s))over bar>ms(2 GeV) = (106 +/- 2 +/- 8) MeV and m<((MS)(l))over bar>(2 GeV) = (4.4 +/- 0.1 +/- 0.4) MeV.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
