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Title

Kaon mixing beyond the SM from N-f=2 tmQCD and model independent constraints from the UTA

AuthorsBertone, Valerio; Carrasco, Nuria ; Ciuchini, Marco; Dimopoulos, P.; Frezzotti, R.; Giménez Gómez, Vicente ; Lubicz, V.; Martinelli, G.; Mescia, F.; Papinutto, M.; Rossi, G. C.; Silvestrini, Luca; Simula, S.; Tarantino, C.; Vladikas, Anastassios
KeywordsLattice QCD
Beyond Standard Model
Issue Date1-Mar-2013
PublisherSpringer
CitationJournal of High Energy Physics 03 (3): 089 - 53 (2013)
AbstractWe 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.
Publisher version (URL)http://dx.doi.org/10.1007/JHEP03(2013)089
URIhttp://hdl.handle.net/10261/124902
DOI10.1007/JHEP03(2013)089
ISSN1029-8479
E-ISSN1029-8479
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