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@ARTICLE{Drr:17094,
      author       = {Dürr, S. and Fodor, Z. and Hoelbling, C. and Katz, S.D.
                      and Krieg, S. and Kurth, T. and Lellouch, L. and Lippert,
                      Th. and McNeile, C. and Portelli, A. and Szabó, K.K.},
      title        = {{P}recision computation of the kaon bag parameter},
      journal      = {Physics letters / B},
      volume       = {705},
      issn         = {0370-2693},
      address      = {Amsterdam},
      publisher    = {North-Holland Publ.},
      reportid     = {PreJuSER-17094},
      pages        = {477 - 481},
      year         = {2011},
      note         = {We thank Jerome Charles, Robert Harlander and Steve Sharpe
                      for helpful discussions. Computations were performed using
                      HPC resources from FZ Julich and from GENCI-[IDRIS/CCRT]
                      (grant 52275) and clusters at Wuppertal and CPT. This work
                      is supported in part by EU grants I3HP, FP7/2007-2013/ERC
                      No. 208740, MRTN-CT-2006-035482 (FLAVIAnet), DFG grants FO
                      502/2, SFB-TR 55, by CNRS grants GDR 2921 and PICS 4707.},
      abstract     = {Indirect CP violation in K -> pi pi decays plays a central
                      role in constraining the flavor structure of the Standard
                      Model (SM) and in the search for new physics. For many years
                      the leading uncertainty in the SM prediction of this
                      phenomenon was the one associated with the nonperturbative
                      strong interaction dynamics in this process. Here we present
                      a fully controlled lattice QCD calculation of these effects,
                      which are described by the neutral kaon mixing parameter
                      B-K. We use a two step HEX smeared clover-improved Wilson
                      action, with four lattice spacings from a approximate to
                      0.054 fm to a approximate to 0.093 fm and pion masses at and
                      even below the physical value. Nonperturbative
                      renormalization is performed in the RI-MOM scheme, where we
                      find that operator mixing induced by chiral symmetry
                      breaking is very small. Using fully nonperturbative
                      continuum running, we obtain our main result B-K(RI)(3.5
                      GeV) = 0.531(6)(stat)(2)(sys). A perturbative 2-loop
                      conversion yields B-K((MS) over bar -NDR)(2 GeV) =
                      0.564(6)(stat)(3)(sys)(6)(PT) and B (B) over cap (K) =
                      0.773(8)(stat)(3)(sys)(8)(PT), which is in good agreement
                      with current results from fits to experimental data. (C)
                      2011 Elsevier B.V. All rights reserved.},
      keywords     = {J (WoSType)},
      cin          = {JSC},
      ddc          = {530},
      cid          = {I:(DE-Juel1)JSC-20090406},
      pnm          = {Scientific Computing (FUEK411) / 411 - Computational
                      Science and Mathematical Methods (POF2-411)},
      pid          = {G:(DE-Juel1)FUEK411 / G:(DE-HGF)POF2-411},
      shelfmark    = {Physics, Multidisciplinary},
      typ          = {PUB:(DE-HGF)16},
      UT           = {WOS:000297490400005},
      doi          = {10.1016/j.physletb.2011.10.043},
      url          = {https://juser.fz-juelich.de/record/17094},
}