scholarly journals Lattice-motivated QCD coupling and hadronic contribution to muon g − 2

2021 ◽  
Vol 48 (5) ◽  
pp. 055008
Author(s):  
Gorazd Cvetič ◽  
Reinhart Kögerler
Keyword(s):  
Hadronic Contribution

scholarly journals Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector

2019 ◽  
Vol 218 ◽  
pp. 02012
Author(s):  
Graziano Venanzoni
Keyword(s):  
Fine Structure ◽  
Energy Region ◽  
Direct Evidence ◽  
Branching Ratio ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Recent Measurement ◽  
Single Measurement ◽  
Lepton Universality ◽  
Hadronic Contribution

I will report on the recent measurement of the fine structure constant below 1 GeV with the KLOE detector. It represents the first measurement of the running of α(s) in this energy region. Our results show a more than 5σ significance of the hadronic contribution to the running of α(s), which is the strongest direct evidence both in time-and space-like regions achieved in a single measurement. From a fit of the real part of Δα(s) and assuming the lepton universality the branching ratio BR(ω → µ+µ−) = (6.6 ± 1.4stat ± 1.7syst) · 10−5 has been determined

scholarly journals Hadronic contribution to the muon g−2: A Dyson–Schwinger perspective

2012 ◽  
Vol 67 (2) ◽  
pp. 563-568 ◽  
Author(s):  
T. Goecke ◽  
C.S. Fischer ◽  
R. Williams
Keyword(s):  
Hadronic Contribution

scholarly journals AN ANALYTIC METHOD OF DESCRIBING R-RELATED QUANTITIES IN QCD

2006 ◽  
Vol 21 (17) ◽  
pp. 1355-1368 ◽  
Author(s):  
K. A. MILTON ◽  
I. L. SOLOVTSOV ◽  
O. P. SOLOVTSOVA
Keyword(s):  
Light Quark ◽  
Structure Constant ◽  
Fine Structure Constant ◽  
Analytic Method ◽  
Suggested Model ◽  
Quark Masses ◽  
Vector Channel ◽  
Hadronic Contribution ◽  
Decay Widths ◽  
Physical Quantities

A model based on the analytic approach to QCD, involving a summation of threshold singularities and taking into account the nonperturbative character of the light quark masses, is applied to find hadronic contributions to different physical quantities. It is shown that the suggested model allows us to describe well such objects as the hadronic contribution to the anomalous magnetic moment of the muon, the ratio of hadronic to leptonic τ-decay widths in the vector channel, the Adler D-function, the smeared RΔ-function, and the hadronic contribution to the evolution of the fine structure constant.

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