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View article: The anomalous magnetic moment of the muon in the Standard Model: an update
The anomalous magnetic moment of the muon in the Standard Model: an update Open
We present the current Standard Model (SM) prediction for the muon anomalous magnetic moment, $a_μ$, updating the first White Paper (WP20) [1]. The pure QED and electroweak contributions have been further consolidated, while hadronic contr…
View article: Time-kernel for lattice determinations of NLO hadronic vacuum polarization contributions to the muon g-2
Time-kernel for lattice determinations of NLO hadronic vacuum polarization contributions to the muon g-2 Open
We study the time-momentum representation of the kernel needed to compute the hadronic vacuum polarization contribution to the muon g-2 in the space-like region at next-to-leading order. For small values of the time, we present analytical …
View article: Time-kernel for lattice determinations of NLO hadronic vacuum polarization contributions to the muon $g$-$2$
Time-kernel for lattice determinations of NLO hadronic vacuum polarization contributions to the muon $g$-$2$ Open
We study the time-momentum representation of the kernel needed to compute hadronic vacuum polarization contributions to the muon $g$-$2$ in the space-like region at next-to-leading order. For small values of the time, we present analytical…
View article: Preface
Preface Open
di Fisica Nucleare) -Sezione di Napoli.The involved scientific community has been that of experiments like muon g-2, Mu2e, MEG, Mu3e, COMET, but also that of the K and B meson physics.More than thirty talks were presented covering the theo…
View article: Prospects for precise predictions of $a_μ$ in the Standard Model
Prospects for precise predictions of $a_μ$ in the Standard Model Open
We discuss the prospects for improving the precision on the hadronic corrections to the anomalous magnetic moment of the muon, and the plans of the Muon $g-2$ Theory Initiative to update the Standard Model prediction.
View article: Mini-Proceedings of the STRONG2020 Virtual Workshop on "Space-like and Time-like determination of the Hadronic Leading Order contribution to the Muon $g-2$"
Mini-Proceedings of the STRONG2020 Virtual Workshop on "Space-like and Time-like determination of the Hadronic Leading Order contribution to the Muon $g-2$" Open
The mini-proceedings of the STRONG2020 Virtual Workshop "Space-like and Time-like determination of the Hadronic Leading Order contribution to the Muon $g-2$", November 24--26 2021, are presented. This is the first workshop of the STRONG202…
View article: Hadronic vacuum polarization contributions to the muon $g$-2 in the\n space-like region
Hadronic vacuum polarization contributions to the muon $g$-2 in the\n space-like region Open
We present simple analytic expressions to compute the hadronic vacuum\npolarization contribution to the muon $g$-2 in the space-like region up to\nnext-to-next-to-leading order. These results can be employed in lattice QCD\ncalculations of…
View article: New physics at the MUonE experiment at CERN
New physics at the MUonE experiment at CERN Open
A confirmation of the long-standing muon $g$-2 discrepancy requires both\nexperimental and theoretical progress. On the theory side, the hadronic\ncorrections are under close scrutiny, as they induce the leading uncertainty of\nthe Standar…
View article: The muon $g$-2 and $Δα$ connection
The muon $g$-2 and $Δα$ connection Open
The discrepancy between the Standard Model theory and experimental measurement of the muon magnetic moment anomaly, $a_μ=\left(g_μ-2\right)/2$, is connected to precision electroweak (EW) predictions via their common dependence on hadronic …
View article: Preface
Preface Open
by the Physics Department of the University of Naples "Federico II" and by INFN (Istituto Nazionale di Fisica Nucleare) -Sezione di Napoli.The focus has been on the physics of flavor changing and conserving processes, with presentations on…
View article: Muon-Electron Scattering at Next-To-Next-To-Leading Order: The Hadronic Corrections
Muon-Electron Scattering at Next-To-Next-To-Leading Order: The Hadronic Corrections Open
The standard model prediction for muon-electron scattering beyond leading order requires the inclusion of QCD contributions which cannot be computed perturbatively. At next-to- and next-to-next-to-leading order, they arise from one- and tw…
View article: On μe-scattering at NNLO in QED
On μe-scattering at NNLO in QED Open
We report on the current status of the analytic evaluation of the two-loop corrections to the μescattering in Quantum Electrodynamics, presenting state-of-the art techniques which have been developed to address this challenging task.
View article: Preface
Preface Open
Department of the University of Naples "Federico II" and by INFN (Istituto Nazionale di Fisica Nucleare) -Sezione di Napoli.The focus has still been continued on the physics of flavour changing and conserving processes, the involved scient…
View article: Contributions of axionlike particles to lepton dipole moments
Contributions of axionlike particles to lepton dipole moments Open
We examined contributions of a spin-0 axionlike particle (ALP) to lepton dipole moments, g - 2 and EDMs. Barr-Zee and light-by-light loop effects from a light pseudoscalar ALP are found to be capable of resolving the longstanding muon g - …
View article: Precision tests via radiative $μ$ and $τ$ leptonic decays
Precision tests via radiative $μ$ and $τ$ leptonic decays Open
The branching fractions of radiative leptonic τ decays (τ → lν νγ, l = e, µ) were recently measured by the BABAR collaboration with a relative error of about 3%.The measurement of the branching ratio B(τ → e ννγ), for a minimum photon ener…
View article: Light-by-light contributions of axion-like particles to lepton dipole moments
Light-by-light contributions of axion-like particles to lepton dipole moments Open
Contributions of a spin 0 axion-like particle (ALP) to lepton dipole moments, g-2 and EDMs, are examined. Light-by-light loop effects from a light pseudoscalar ALP are found to be capable of resolving the long-standing muon g-2 discrepancy…
View article: τ dipole moments via radiative leptonic τ decays
τ dipole moments via radiative leptonic τ decays Open
We propose a new method to probe the magnetic and electric dipole moments of the tau lepton using precise measurements of the differential rates of radiative leptonic tau decays at high-luminosity B factories. Possible deviations of these …
View article: Precision tests via radiative $μ$ and $τ$ leptonic decays
Precision tests via radiative $μ$ and $τ$ leptonic decays Open
The branching fractions of radiative leptonic $τ$ decays $(τ\to l ν\barν γ$, $l=e,μ)$ were recently measured by the Babar collaboration with a relative error of about 3%. The measurement of the branching ratio $\mathcal{B} (τ\to e \barν νγ…
View article: Preface
Preface Open
This was the first workshop of a series which aims to discuss the status and prospects of the physics of Flavour changing and conserving processes, and addresses the scientific community involved in experiments like g -2, Mu2e, MEG, Mu3e, …