Kaon Mixing Beyond the SM from Nf=2 tmQCD and model independent constraints from the UTA - IN2P3 - Institut national de physique nucléaire et de physique des particules Access content directly
Journal Articles Journal of High Energy Physics Year : 2013

Kaon Mixing Beyond the SM from Nf=2 tmQCD and model independent constraints from the UTA

V. Bertone
  • Function : Author
M. Ciuchini
  • Function : Author
P. Dimopoulos
  • Function : Author
R. Frezzotti
  • Function : Author
V. Gimenez
  • Function : Author
V. Lubicz
  • Function : Author
G. Martinelli
  • Function : Author
F. Mescia
  • Function : Author
G. C. Rossi
  • Function : Author
L. Silvestrini
  • Function : Author
S. Simula
  • Function : Author
C. Tarantino
  • Function : Author
A. Vladikas
  • Function : Author
For The Etm Collaboration
  • Function : Author
Nuria Carrasco
  • Function : Author

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 \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 Nf=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.

Dates and versions

in2p3-00832606 , version 1 (11-06-2013)

Identifiers

Cite

V. Bertone, M. Ciuchini, P. Dimopoulos, R. Frezzotti, V. Gimenez, et al.. Kaon Mixing Beyond the SM from Nf=2 tmQCD and model independent constraints from the UTA. Journal of High Energy Physics, 2013, 03, pp.089. ⟨10.1007/JHEP03(2013)089⟩. ⟨in2p3-00832606⟩
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