6533b858fe1ef96bd12b638d
RESEARCH PRODUCT
Kaon mixing beyond the SM from N-f=2 tmQCD and model independent constraints from the UTA
N. CarrascoGiancarlo RossiAnastassios VladikasRoberto FrezzottiLuca SilvestriniV. GimenezValerio BertoneSilvano SimulaFederico MesciaMarco CiuchiniCecilia TarantinoG. MartinelliVittorio LubiczM. PapinuttoM. PapinuttoPetros Dimopoulossubject
QuarkStrange quarkParticle physicsNuclear and High Energy PhysicsPhysics beyond the Standard ModelComputationHigh Energy Physics::LatticeFOS: Physical sciencesLattice QCD01 natural sciencesRenormalizationHigh Energy Physics - Phenomenology (hep-ph)High Energy Physics - Lattice0103 physical sciences010306 general physicsPhysicsHamiltonian matrixUnitarity010308 nuclear & particles physics[PHYS.HLAT]Physics [physics]/High Energy Physics - Lattice [hep-lat]Computer Science::Information RetrievalHigh Energy Physics - Lattice (hep-lat)FísicaLattice QCDSettore FIS/02 - Fisica Teorica Modelli e Metodi MatematiciHigh Energy Physics - Phenomenology[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]Beyond Standard ModelBeyond the Standard Model Physicsdescription
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.
| year | journal | country | edition | language |
|---|---|---|---|---|
| 2013-03-01 |