Titel
Effects of longitudinal short-distance constraints on the hadronic light-by-light contribution to the muon g-2
Autor*in
Abstract
We present a model-independent method to estimate the effects of short-distance constraints (SDCs) on the hadronic light-by-light contribution to the muon anomalous magnetic moment aHLbLμ. The relevant loop integral is evaluated using multi-parameter families of interpolation functions, which satisfy by construction all constraints derived from general principles and smoothly connect the low-energy region with those where either two or all three independent photon virtualities become large. In agreement with other recent model-based analyses, we find that the SDCs and thus the infinite towers of heavy intermediate states that are responsible for saturating them have a rather small effect on aHLbLμ. Taking as input the known ground-state pseudoscalar pole contributions, we obtain that the longitudinal SDCs increase aHLbLμ by (9.1±5.0)×10−11, where the isovector channel is responsible for (2.6±1.5)×10−11. More precise estimates can be obtained with our method as soon as further accurate, model-independent information about important low-energy contributions from hadronic states with masses up to 1–2 GeV become available.
Stichwort
Physics and Astronomy (miscellaneous)Engineering (miscellaneous)
Objekt-Typ
Sprache
Englisch [eng]
Persistent identifier
Erschienen in
Titel
The European Physical Journal C
Band
80
Ausgabe
12
ISSN
1434-6044
Erscheinungsdatum
2020
Publication
Springer Science and Business Media LLC
Projekt
Kod / Identifikator
I 3845-N27
Fördergeber
Projekt
Kod / Identifikator
W1252-N27
Fördergeber
Erscheinungsdatum
2020
Zugänglichkeit
Rechte
Rechteangabe
© The Author(s) 2020
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