Anxiety in older adults

Gulpers, Bernice

doi:10.26481/dis.20190626bg

Cited by 6 publications

(6 citation statements)

References 152 publications

(245 reference statements)

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“…TheK 0 K + →K 0 K + partial-wave amplitude vanishes at s = 0 at leading chiral order (18). This zero, however, is accidental since it is not associated with a soft pion theorem.…”

Section: Scattering Amplitudes At O(p 4 )mentioning

confidence: 90%

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Form factors of the isovector scalar current and the $$\eta \pi $$ η π scattering phase shifts

Albaladejo

Moussallam

2015

Eur. Phys. J. C

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A model for S-wave scattering is proposed which could be realistic in an energy range from threshold up to above 1 GeV, where inelasticity is dominated by the channel. The T-matrix, satisfying two-channel unitarity, is given in a form which matches the chiral expansion results at order exactly for the , amplitudes and approximately for . It contains six phenomenological parameters. Asymptotic conditions are imposed which ensure a minimal solution of the Muskhelishvili–Omnès problem, thus allowing one to compute the and form factor matrix elements of the scalar current from the T-matrix. The phenomenological parameters are determined such as to reproduce the experimental properties of the , resonances, as well as the chiral results of the and scalar radii, which are predicted to be remarkably small at . This T-matrix model could be used for a unified treatment of the final-state interaction problem in processes such as , , or the initial-state interaction in .

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“…TheK 0 K + →K 0 K + partial-wave amplitude vanishes at s = 0 at leading chiral order (18). This zero, however, is accidental since it is not associated with a soft pion theorem.…”

Section: Scattering Amplitudes At O(p 4 )mentioning

confidence: 90%

“…[10][11][12][13][14][15][16] for theoretical calculations, and refs. [17][18][19] for lattice determinations). Its application to the strangeness changing Kπ scalar form factor and the corresponding scalar radius r 2 Kπ S were discussed in refs.…”

Section: Introductionmentioning

confidence: 99%

Form factors of the isovector scalar current and the $$\eta \pi $$ η π scattering phase shifts

Albaladejo

Moussallam

2015

Eur. Phys. J. C

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“…At that point the dominating uncertainty will come from the missing disconnected contribution. The application of the techniques in [27] looks promising in this respect.…”

Section: Discussionmentioning

confidence: 99%

Lattice calculations of the leading hadronic contribution to g-2

Morte

Wittig

Jäger

et al. 2012

Proceedings of the 30th International Symposium on Lattice Field Theory — PoS(Lattice 2012)

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We report on our ongoing project to calculate the leading hadronic contribution to the anomalous magnetic moment of the muon a HLO µ using two dynamical flavours of non-perturbatively O(a) improved Wilson fermions. In this study, we changed the vacuum polarisation tensor to a combination of local and point-split currents which significantly reduces the numerical effort. Partially twisted boundary conditions allow us to improve the momentum resolution of the vacuum polarisation tensor and therefore the determination of the leading hadronic contribution to (g − 2) µ. We also extended the range of ensembles to include a pion mass below 200 MeV which allows us to check the non-trivial chiral behaviour of a HLO µ .

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“…which we denote as the standard [6] and split-even estimators [5] in the following. Note that the cost of the two estimators is the same for a given N s .…”

Section: Estimators For Differences Of Single-propagator Tracesmentioning

confidence: 99%

Frequency-splitting estimators of single-propagator traces

et al. 2019

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The evaluation of these diagrams is required for many phenomenologically interesting observables, but suffers from large statistical errors due to the vacuum and random-noise contributions to their variances. Motivated by a theoretical analysis of the variances, we introduce a new family of stochastic estimators of single-propagator traces built upon a frequency splitting combined with a hopping expansion of the quark propagator, and test their efficiency in two-flavour QCD with pions as light as 190 MeV. The use of these estimators reduces the cost of the computation by one to two orders of magnitude over standard estimators depending on the fermion bilinear. As a concrete application, we show the impact of these findings on the computation of the hadronic vacuum polarization contribution to the muon anomalous magnetic moment.

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Anxiety in older adults

Cited by 6 publications

References 152 publications

Form factors of the isovector scalar current and the $$\eta \pi $$ η π scattering phase shifts

Form factors of the isovector scalar current and the $$\eta \pi $$ η π scattering phase shifts

Lattice calculations of the leading hadronic contribution to g-2

Frequency-splitting estimators of single-propagator traces

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