New physics behind the new muon g-2 puzzle?
Abstract
The recent measurement of the muon g-2 at Fermilab confirms the previous Brookhaven result. The leading hadronic vacuum polarization (HVP) contribution to the muon g-2 represents a crucial ingredient to establish if the Standard Model prediction differs from the experimental value. A recent lattice QCD result by the BMW collaboration shows a tension with the low-energy e+e- →hadrons data which are currently used to determine the HVP contribution. We refer to this tension as the new muon g-2 puzzle. In this Letter we consider the possibility that new physics contributes to the e+e- →hadrons cross-section. This scenario could, in principle, solve the new muon g-2 puzzle. However, we show that this solution is excluded by a number of experimental constraints.
- Publication:
-
Physics Letters B
- Pub Date:
- June 2022
- DOI:
- 10.1016/j.physletb.2022.137037
- arXiv:
- arXiv:2112.08312
- Bibcode:
- 2022PhLB..82937037D
- Keywords:
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- Muon g-2;
- Light new physics;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment;
- High Energy Physics - Lattice
- E-Print:
- 6 pages, 4 figures. Typo in Fig. 4 (left panel) corrected