Improved determination of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:msub><mml:mi>B</mml:mi><mml:mi>K</mml:mi></mml:msub></mml:math>with staggered quarks

Bae, T.; Jang, Yong-Chull; Jeong, Hwancheol; Jung, Chulwoo; Kim, Hyungjin; Kim, Jangho; Kim, Jongjeong; Kim, Kwang-Woo; Kim, Sunghee; Lee, Weonjong; Leem, Jong-Han; Pak, Jeonghwan; Park, Sung Woo; Sharpe, Stephen R.; Yoon, Boram

doi:10.1103/physrevd.89.074504

Cited by 19 publications

(28 citation statements)

References 24 publications

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“…This differs slightly from the estimate we used in Ref. [9], where we used the shift in the quantities on a specific MILC ensemble. The Y fit errors turn out to be of comparable size to those from X fits, ranging up to 2%.…”

contrasting

confidence: 42%

“…We have also tried fits with broader contraints, d 2−4 = 0 ± 4, but find that these do not significantly change the χ 2 or the resulting fit parameters. We find, as was the case in our earlier work [8,9,23] that we cannot obtain a good description if we include the coarse lattices. Thus we fit all the fine, superfine and ultrafine lattice data to Eq.…”

Section: Continuum-chiral Extrapolationmentioning

confidence: 65%

“…[2][3][4][5][6][7][8][9] are such that the average has an error of ∼ 1.3% [1]. This is accurate enough to provide strong constraints on SM parameters (see, e.g., Refs.…”

Section: Introductionmentioning

confidence: 86%

“…(18). We call this theF 1 fit, since it is a small variation from the fitting function F 1 B in our previous work [9] (differing only in the offset in the d 3 term). Since the number of configurations differ on each ensemble, errors on the fit parameters are obtained using a variant of the bootstrap method.…”

Section: Continuum-chiral Extrapolationmentioning

confidence: 99%

“…[9,23]. The first step is the chiral extrapolation of the valence quark masses to their physical values.…”

Section: Chiral Extrapolationmentioning

confidence: 99%

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Kaon BSMB-parameters using improved staggered fermions fromNf=2+1unquenched QCD

et al. 2016

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We present results for the matrix elements of the additional ∆S = 2 operators that appear in models of physics beyond the Standard Model (BSM), expressed in terms of four BSM B-parameters. Combined with experimental results for ∆MK and K , these constrain the parameters of BSM models. We use improved staggered fermions, with valence HYP-smeared quarks and N f = 2 + 1 flavors of "asqtad" sea quarks. The configurations have been generated by the MILC collaboration. The matching between lattice and continuum four-fermion operators and bilinears is done perturbatively at one-loop order. We use three lattice spacings for the continuum extrapolation: a ≈ 0.09, 0.06 and 0.045 fm. Valence light-quark masses range down to ≈ m phys s /13 while the light sea-quark masses range down to ≈ m phys s /20. Compared to our previous published work, we have added four additional lattice ensembles, leading to better controlled extrapolations in the lattice spacing and sea-quark masses. We report final results for two renormalization scales, µ = 2 GeV and 3 GeV, and compare them to those obtained by other collaborations. Agreement is found for two of the four BSM B-parameters (B2 and B SUSY 3). The other two (B4 and B5) differ significantly from those obtained using RI-MOM renormalization as an intermediate scheme, but are in agreement with recent preliminary results obtained by the RBC-UKQCD collaboration using RI-SMOM intermediate schemes.

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contrasting

confidence: 42%

Section: Continuum-chiral Extrapolationmentioning

confidence: 65%

“…[2][3][4][5][6][7][8][9] are such that the average has an error of ∼ 1.3% [1]. This is accurate enough to provide strong constraints on SM parameters (see, e.g., Refs.…”

Section: Introductionmentioning

confidence: 86%

Section: Continuum-chiral Extrapolationmentioning

confidence: 99%

“…[9,23]. The first step is the chiral extrapolation of the valence quark masses to their physical values.…”

Section: Chiral Extrapolationmentioning

confidence: 99%

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Kaon BSMB-parameters using improved staggered fermions fromNf=2+1unquenched QCD

et al. 2016

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Upper bounds on ε′/ε parameters B 6 (1/2) and B 8 (3/2) from large N QCD and other news

Buras¹,

Gérard

2015

J. High Energ. Phys.

149

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Neutral meson oscillations on the lattice

Carrasco

2016

Nuclear and Particle Physics Proceedings

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Accurate measurements of K, D and B meson mixing amplitudes provide stringent constraints in the Unitary Triangle analysis, as well as useful bounds on New Physics scales. Lattice QCD provides a non perturbative tool to compute the hadronic matrix elements entering in the effective weak Hamiltonian, with errors at a few percent level and systematic uncertainties under control. I review recent lattice results for these hadronic matrix element performed with N f = 2, N f = 2 + 1 and N f = 2 + 1 + 1 dynamical sea quarks.

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Improved determination ofBKwith staggered quarks

Cited by 19 publications

References 24 publications

Kaon BSMB-parameters using improved staggered fermions fromNf=2+1unquenched QCD

Kaon BSMB-parameters using improved staggered fermions fromNf=2+1unquenched QCD

Upper bounds on ε′/ε parameters B 6 (1/2) and B 8 (3/2) from large N QCD and other news

Neutral meson oscillations on the lattice

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