Sigma terms and strangeness content of the nucleon with N
              
                f
               = 2 + 1 + 1 twisted mass fermions

Dinter, Simon; Drach, Vincent; Frezzotti, R.; Herdoíza, Gregorio; Jansen, Karl; Rossi, G.C.

doi:10.1007/jhep08(2012)037

Cited by 47 publications

(58 citation statements)

References 62 publications

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“…The interesting lattice setup briefly described above has already been successfully tested in B K computations both in the quenched approximation [39] and on ensembles with N f = 2 [8] and N f = 2 + 1 + 1 dynamical quarks [40], as well as in unquenched (N f = 2 + 1 + 1) studies of meson masses and decay constants [41] and nucleon sigma terms [42].…”

Section: Jhep03(2013)089mentioning

confidence: 99%

Kaon mixing beyond the SM from Nf = 2 tmQCD and model independent constraints from the UTA

Bertone

Carrasco

Ciuchini

et al. 2013

J. High Energ. Phys.

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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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Section: Jhep03(2013)089mentioning

confidence: 99%

Kaon mixing beyond the SM from Nf = 2 tmQCD and model independent constraints from the UTA

Bertone

Carrasco

Ciuchini

et al. 2013

J. High Energ. Phys.

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“…The shortcoming of our result in Ref. [16] has been that, being a feasibility study only, y N was obtained at only one value of the lattice spacing, a single finite volume and only one quark mass.…”

Section: Introductionmentioning

confidence: 85%

“…We will refer to t and t s as the source-operator separation and the source-sink separation, respectively. We have shown in [16] that Rðt; t s Þ does not need to be renormalized since no mixing in the renormalization pattern appears. The ratio Rðt; t s Þ has the following asymptotic behavior:…”

Section: Lattice Qcd Calculationmentioning

confidence: 95%

“…[16] we were able to make a significant step forward by using a setup of maximally twisted mass fermions which avoids any mixing in the renormalization of the σ terms and hence y N does not need to be renormalized. In addition, by employing special noise reduction techniques, amenable for our setup, we could achieve a significant improvement in the signal to noise ratio for y N .…”

Section: Introductionmentioning

confidence: 99%

“…[16] by using different lattice spacings, finite volumes and quark masses such that we can probe the effects of the discretization, the finite volume and nonphysical quark masses. In addition, we now have available a high statistics analysis of excited state effects which, as we will see below, are potentially very dangerous for the computations of y N .…”

Section: Introductionmentioning

confidence: 99%

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Strangeness of the nucleon from lattice QCD

et al. 2015

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We present a nonperturbative calculation of the strangeness of the nucleon y N within the framework of lattice QCD. This observable is known to be an important cornerstone to interpret results from direct dark matter detection experiments. We perform a lattice computation for y N with an analysis of systematic effects originating from discretization, finite size, chiral extrapolation and excited state effects leading to the value of y N ¼ 0.173ð50Þ. The rather large uncertainty of this value of y N is dominated by systematic uncertainties which we are able to quantify in this work.

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Standard model contribution to the electric dipole moment of the deuteron, 3H, and 3He nuclei

Yamanaka

Hiyama

2016

J. High Energ. Phys.

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We calculate for the first time the electric dipole moment (EDM) of the deuteron, 3 H, and 3 He nuclei generated by the one-meson exchange CP-odd nuclear force in the standard model. The effective |∆S| = 1 four-quark operators are matched to the |∆S| = 1 standard model processes involving the CP phase of the Cabibbo-KobayashiMaskawa matrix at the electroweak scale and run down to the hadronic scale µ = 1 GeV according to the renormalization group evolution in the next-to-leading logarithmic order. At the hadronic scale, the hadron matrix elements are modeled in the factorization approach. We then obtain the one-meson (pion, eta meson, and kaon) exchange CP-odd nuclear force, which is the combination of the |∆S| = 1 meson-baryon vertices which issue from the penguin operator and the hyperon-nucleon transition. From this CP-odd nuclear force, the nuclear EDM is calculated with the realistic Argonne v18 interaction and the CP-odd nuclear force using the Gaussian expansion method. It is found that the EDMs of light nuclear systems are of order O(10 −31 )e cm. We also estimate the standard model contribution to other hadronic CP violating observables such as the EDMs of 6 Li, 9 Be nuclei, and the atomic EDMs of 129 Xe, 199 Hg, 211 Rn, and 225 Ra generated through the nuclear Schiff moment. We then analyze the source of theoretical uncertainties and show some possible ways to overcome them.

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Sigma terms and strangeness content of the nucleon with N f = 2 + 1 + 1 twisted mass fermions

Cited by 47 publications

References 62 publications

Kaon mixing beyond the SM from Nf = 2 tmQCD and model independent constraints from the UTA

Kaon mixing beyond the SM from Nf = 2 tmQCD and model independent constraints from the UTA

Strangeness of the nucleon from lattice QCD

Standard model contribution to the electric dipole moment of the deuteron, 3H, and 3He nuclei

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