Abstract
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 ∆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 nonperturbative 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.
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ArXiv ePrint: 1207.1287
On leave of absence from Dipartimento di Fisica, Università di Roma “La Sapienza” Piazzale A. Moro, I-00185 Rome, Italy. (M. Papinutto)
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The ETM collaboration., Bertone, V., Carrasco, N. et al. Kaon mixing beyond the SM from Nf = 2 tmQCD and model independent constraints from the UTA. J. High Energ. Phys. 2013, 89 (2013). https://doi.org/10.1007/JHEP03(2013)089
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DOI: https://doi.org/10.1007/JHEP03(2013)089