TY  - JOUR
AU  - Bertone, V.
AU  - Carrasco, N.
AU  - Ciuchini, M.
AU  - Dimopoulos, P.
AU  - Frezzotti, R.
AU  - Gimenez, V.
AU  - Lubicz, V.
AU  - Martinelli, G.
AU  - Mescia, F.
AU  - Papinutto, M.
AU  - Rossi, G. C.
AU  - Silvestrini, L.
AU  - Simula, S.
AU  - Tarantino, C.
AU  - Vladikas, A.
PY  - 2013
DA  - 2013//
TI  - Kaon mixing beyond the SM from N-f=2 tmQCD and model independent constraints from the UTA
T2  - J. High Energy Phys.
JO  - Journal of High Energy Physics
SP  - 089
EP  - 53pp
VL  - 03
IS  - 3
PB  - Springer
KW  - Lattice QCD
KW  - Beyond Standard Model
AB  - We present the first unquenched, continuum limit, lattice QCD results for the matrix elements of the operators describing neutral kaon oscillations in extensions of the Standard Model. Owing to the accuracy of our calculation on Delta S = 2 weak Hamiltonian matrix elements, we are able to provide a refined Unitarity Triangle analysis improving the bounds coming from model independent constraints on New Physics. In our non-perturbative computation we use a combination of N-f = 2 maximally twisted sea quarks and Osterwalder-Seiler valence quarks in order to achieve both O(a)-improvement and continuum-like renormalization properties for the relevant four-fermion operators. The calculation of the renormalization constants has been performed non-perturbatively in the RI-MOM scheme. Based on simulations at four values of the lattice spacing and a number of quark masses we have extrapolated/interpolated our results to the continuum limit and physical light/strange quark masses.
SN  - 1029-8479
UR  - http://arxiv.org/abs/arXiv:1207.1287
UR  - https://doi.org/10.1007/JHEP03(2013)089
DO  - 10.1007/JHEP03(2013)089
LA  - English
N1  - WOS:000317522400001
ID  - Bertone_etal2013
ER  -