One loop matching coefficients for a variant overlap action and some of its simpler relatives

DeGrand, Thomas

doi:10.1103/physrevd.67.014507

Cited by 28 publications

(14 citation statements)

References 36 publications

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“…Assuming α s ∼ 0.2-0.3, these contributions are not negligible. The small scaling violation of the actual data may suggest that these effects are small, which is consistent with an expectation that the radiative corrections are relatively small in general when using link smearing [29]. An explicit perturbative calculation to confirm this expectation is on-going.…”

Section: Speed-of-light For Pseudo-scalar Mesonsupporting

confidence: 79%

Improved lattice fermion action for heavy quarks

Cho

Hashimoto

Jüttner

et al. 2015

J. High Energ. Phys.

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Abstract:We develop an improved lattice action for heavy quarks based on Brillouintype fermions, that have excellent energy-momentum dispersion relation. The leading discretization errors of O(a) and O(a 2 ) are eliminated at tree-level. We carry out a scaling study of this improved Brillouin fermion action on quenched lattices by calculating the charmonium energy-momentum dispersion relation and hyperfine splitting. We present a comparison to standard Wilson fermions and domain-wall fermions.

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Section: Speed-of-light For Pseudo-scalar Mesonsupporting

confidence: 79%

Improved lattice fermion action for heavy quarks

Cho

Hashimoto

Jüttner

et al. 2015

J. High Energ. Phys.

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“…The tiny value of K 1 suggests that we should not worry about lattice induced mixing effects and just take K 1 = 0. For comparison, the value of K 1 with thin links is nearly 20 times larger [46]. This allows us to quickly extend the mnemonic of Eq.…”

Section: Acknowledgmentsmentioning

confidence: 93%

“…Their procedure requires slight modification for operators with an anomalous dimension; our precise technique is that of Ref. [46]. We find q B a = 1.15.…”

Section: Acknowledgmentsmentioning

confidence: 98%

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Partial compositeness and baryon matrix elements on the lattice

et al. 2019

Self Cite

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Partial compositeness is a mechanism for the generation of fermion masses which replaces a direct Higgs coupling to the fermions by a linear mixing with heavy composite partners. We present the first calculation of the relevant matrix element in a lattice model which is very close to a candidate theory containing a composite Higgs boson and a partially composite top quark. Specifically, our model is an SU(4) gauge theory coupled to dynamical fermions in the fundamental and two-index antisymmetric (sextet) representations. The matrix element we obtain is small and hence our result disfavors the scenario of obtaining a realistic top mass in this model.

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“…Following Ref. [DeG03], the effect of smearing can be implemented in our one-loop calculation by replacing the gauge field by a smeared one:…”

Section: Perturbative Link Renormalizationmentioning

confidence: 99%

Transverse momentum distributions inside the nucleon from lattice QCD

Musch¹,

Hägler²,

Negele³

et al. 2011

AIP Conference Proceedings

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SummaryNucleons, i.e., protons and neutrons, are composed of quarks and gluons, whose interactions are described by the theory of quantum chromodynamics (QCD), part of the standard model of particle physics. This work applies lattice QCD to compute quark momentum distributions in the nucleon. The calculations make use of lattice data generated on supercomputers that has already been successfully employed in lattice studies of spatial quark distributions ("nucleon tomography"). In order to be able to analyze transverse momentum dependent parton distribution functions, this thesis explores a novel approach based on non-local operators. One interesting observation is that the transverse momentum dependent density of polarized quarks in a polarized nucleon is visibly deformed. A more elaborate operator geometry is required to enable a quantitative comparison to high energy scattering experiments. First steps in this direction are encouraging. ZusammenfassungNukleonen, also Protonen und Neutronen, bestehen aus Quarks und Gluonen, deren Wechselwirkung durch die Quantenchromodynamik (QCD) innerhalb des Standardmodells der Teilchenphysik beschrieben wird. Diese Arbeit nutzt Gitter-QCD zur Berechnung von QuarkImpulsverteilungen im Nukleon. Dabei wird auf Gitterdaten zurückgegriffen, die auf Hochleistungsrechnern erstellt und bereits erfolgreich für die Analyse der räumlichen Quarkverteilung ("Nukleontomographie") eingesetzt wurden. Für die Untersuchung von Transversalimpulsabhängigen Partonverteilungsfunktionen stellt diese Arbeit ein neuartiges Verfahren, basierend auf nicht-lokalen Operatoren, vor. Die Ergebnisse zeigen u.a. eine sichtbare Verformung der Transversalimpuls-abhängigen Dichte polarisierter Quarks im polarisierten Nukleon. Ein quantitativer Vergleich mit Streuexperimenten erfordert kompliziertere Operatorgeometrien. Erste Schritte in diese Richtung sind vielversprechend.

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One loop matching coefficients for a variant overlap action and some of its simpler relatives

Cited by 28 publications

References 36 publications

Improved lattice fermion action for heavy quarks

Improved lattice fermion action for heavy quarks

Partial compositeness and baryon matrix elements on the lattice

Transverse momentum distributions inside the nucleon from lattice QCD

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