242 citations · 2.7k across the 48 of their papers we have counts for
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Hadronic Vacuum Polarization Contribution to as a function of the external lepton mass
David Greynat, Eduardo de Rafael
The hadronic vacuum polarization contribution to the anomalous magnetic moment of a lepton is considered as a function of the lepton mass. We show how the analyticity properties of…
On the Time Momentum Representation of Hadronic Vacuum Polarization and
David Greynat, Eduardo de Rafael
We propose a new set of model independent approximants adapted to the time momentum representation (TMR) of hadronic vacuum polarization (HVP) and its contribution to . They…
The Mellin-Barnes Approach to Hadronic Vacuum Polarization and
Jérôme Charles, David Greynat, Eduardo de Rafael
It is shown that with a precise determination of a few derivatives of the hadronic vacuum polarization (HVP) self-energy function at , from lattice QCD (LQCD) or fr…
Hadronic Vacuum Polarization in QCD and its Evaluation in the Euclidean
Eduardo de Rafael
We discuss a new technique to evaluate integrals of QCD Green's functions in the Euclidean based on their Mellin-Barnes representation. We present as a first application the evalua…
Asymptotic Behaviour of Pion--Pion Total Cross-Sections
David Greynat, Eduardo de Rafael, Grégory Vulvert
We derive a sum rule which shows that the Froissart-Martin bound for the asymptotic behaviour of the total cross sections at high energies, if modulated by the Lukaszuk-Martin…
The Muon (g-2) Theory Value: Present and Future
Thomas Blum, Achim Denig, Ivan Logashenko +4
This White Paper briefly reviews the present status of the muon (g-2) Standard-Model prediction. This value results in a 3 - 4 standard-deviation difference with the experimental r…
The Froissart--Martin Bound for Scattering in QCD
David Greynat, Eduardo de Rafael
The Froissart--Martin bound for total scattering cross sections is reconsidered in the light of QCD properties such as spontaneous chiral symmetry breaking and the counting ru…
Update of the Electron and Muon g-Factors
Eduardo de Rafael
I give an overview of the different contributions to the electron and muon anomalous magnetic moments in the Standard Model. Special emphasis is given to recent QED results as well…
Hadronic Contributions to the Muon Anomaly in the Constituent Chiral Quark Model
David Greynat, Eduardo de Rafael
The hadronic contributions to the anomalous magnetic moment of the muon which are relevant for the confrontation between theory and experiment at the present level of accuracy, are…
Large Nc QCD and Harmonic Sums
Eduardo de Rafael
In the Large-Nc limit of QCD, two--point functions of local operators become Harmonic Sums. I review some properties which follow from this fact and which are relevant for phenomen…
The Constituent Chiral Quark Model Revisited
Eduardo de Rafael
We reconsider the Constituent Chiral Quark Model of Manohar and Georgi in the presence of external sources. As recently emphasized by Weinberg, the corr…
On Anomaly Matching and Holography
Marc Knecht, Santiago Peris, Eduardo de Rafael
We discuss the possible validity in QCD of a relation between Green's functions which has been recently suggested by Son and Yamamoto, based on a class of AdS/CFT-inspired models o…
Hadronic Light-by-Light Scattering Contribution to the Muon Anomalous Magnetic Moment
Joaquim Prades, Eduardo de Rafael, Arkady Vainshtein
We review the current status of theoretical calculations of the hadronic light-by-light scattering contribution to the muon anomalous magnetic moment. Different approaches and rela…
Delta I=1/2 and epsilon'/epsilon in Large-Nc QCD
T. Hambye, S. Peris, E. de Rafael
We present new results for the matrix elements of the Q_6 and Q_4 penguin operators, evaluated in a large-Nc approach which incorporates important O(N_c^2\frac{n_f}{N_c}) unfactori…
Electroweak Hadronic Contributions to the muon g-2
M. Knecht, S. Peris, M. Perrottet +1
We reanalyze the two-loop electroweak hadronic contributions to the muon g-2 that may be enhanced by large logarithms. The present evaluation is improved over those already existin…
Testing an approximation to large-Nc QCD with a toy model
M. Golterman, S. Peris, B. Phily +1
We consider a simple model of large-Nc QCD defined by a spectrum consisting of an infinite set of equally spaced zero-width vector resonances. This model is an excellent theoretica…
Hadronic light-by-light scattering contribution to the muon g-2: an effective field theory approach
M. Knecht, A. Nyffeler, M. Perrottet +1
The hadronic light-by-light contribution to a_{mu}, the anomalous magnetic moment of the muon, is discussed from the point of view of an effective low-energy theory. As an applicat…
Large-Nc QCD and Low Energy Interactions
Eduardo de Rafael
This talk reviews recent progress in formulating the dynamics of the electroweak interactions of hadrons at low energies, within the framework of the 1/Nc-expansion in QCD. The emp…
A Critical Reassessment of Q7 and Q8 Matrix Elements
Marc Knecht, Santiago Peris, E. de Rafael
We compare recent theoretical determinations of weak matrix elements of the electroweak penguin operators Q7 and Q8. We pay special attention to the renormalization scheme dependen…
Minimal Hadronic Ansatz to Large-Nc QCD and Hadronic tau Decay
E. de Rafael
I report on some recent work done in collaboration with Santi Peris and Boris Phily (hep-ph/0007338) where, using the Aleph data on vector and axial-vector spectral functions, we t…
Tests of large-Nc QCD from hadronic tau decay
S. Peris, B. Phily, E. de Rafael
We use the Aleph data on vector and axial-vector spectral functions to test simple duality properties of QCD in the large Nc limit, which emerge in the approximation of a minimal h…
K0-anti-K0 mixing in the 1/Nc expansion
Santiago Peris, Eduardo de Rafael
We present the result for the invariant B_K factor of K0-anti-K0 mixing in the chiral limit and to next-to-leading order in the 1/Nc expansion. We explicitly demonstrate the cancel…
A New Approach to Weak Amplitudes in Large-Nc QCD
M. Knecht, S. Peris, E. de Rafael +1
We report on some recent progress made in understanding weak matrix elements of mesons in the context of the next-to-leading order of the large-Nc approximation to QCD. Specificall…
Large-Nc QCD and Weak Matrix Elements
E. de Rafael
I report on recent progress in calculating electroweak processes within the framework of QCD in the 1/Nc expansion.