scholarly journals Leading-order hadronic contribution to the anomalous magnetic moment of the muon from $N_f=2+1+1$ twisted mass fermions

2014 ◽  
Author(s):  
Grit Hotzel ◽  
Florian Burger ◽  
Xu Feng ◽  
Karl Jansen ◽  
Marcus Petschlies ◽  
...  
Keyword(s):  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Leading Order ◽  
Twisted Mass ◽  
Hadronic Contribution

scholarly journals A revision of radiative corrections to double-Dalitz decays

2019 ◽  
Vol 199 ◽  
pp. 02014
Author(s):  
Pablo Sanchez-Puertas ◽  
K. Kampf ◽  
J. Novotný
Keyword(s):  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Form Factors ◽  
Radiative Corrections ◽  
Leading Order ◽  
Transition Form

The radiative corrections to double-Dalitz $({P\rightarrow\overline ll\overline l'l'})$ decays are revisited and completed up to next-to-leading order in QED, finding mild differences with respect to previous studies. These might be relevant for extracting information about the mesons transition form factors, which play an important role in determining the hadronic light-by-light contribution to the anomalous magnetic moment of the muon.

scholarly journals THEORY OF THE τ LEPTON ANOMALOUS MAGNETIC MOMENT

2007 ◽  
Vol 22 (03) ◽  
pp. 159-179 ◽  
Author(s):  
S. EIDELMAN ◽  
M. PASSERA
Keyword(s):  
Standard Model ◽  
Model Prediction ◽  
Magnetic Moment ◽  
Anomalous Magnetic Moment ◽  
Standard Model Prediction ◽  
Low Energy ◽  
Leading Order ◽  
The Standard Model

This paper reviews and updates the Standard Model prediction of the τ lepton g-2. Updated QED and electroweak contributions are presented, together with new values of the leading-order hadronic term, based on the recent low energy e+ e- data from BaBar, CMD-2, KLOE and SND, and hadronic light-by-light contribution. The total prediction is confronted to the available experimental bounds on the τ lepton anomaly, and prospects for its future measurements are briefly discussed.

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