An alternative evaluation of the leading-order hadronic contribution to the muon g − 2 with MUonE

Ignatov, Fedor ORCID: 0000-0001-7061-6060, Pilato, Riccardo Nunzio ORCID: 0000-0002-4325-7530, Teubner, Thomas ORCID: 0000-0002-0680-0776 and Venanzoni, Graziano ORCID: 0000-0002-3525-476X (2024) An alternative evaluation of the leading-order hadronic contribution to the muon g − 2 with MUonE Physics Letters B, 848. p. 138344. ISSN 0370-2693, 1873-2445

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Abstract

We propose an alternative method to extract the leading-order hadronic contribution to the muon g−2, a<inf>μ</inf>^HLO, with the MUonE experiment. In contrast to the traditional method based on the integral of the hadronic contribution to the running of the electromagnetic coupling, Δα<inf>had</inf>, in the space-like region, our approach relies on the computation of the derivatives of Δα<inf>had</inf>(t) at zero squared momentum transfer t. We show that this approach allows to extract ∼99% of the total value of a<inf>μ</inf>^HLO from the MUonE data, while the remaining ∼1% can be computed combining perturbative QCD and data on e⁺e⁻ annihilation to hadrons. This leads to a competitive evaluation of a<inf>μ</inf>^HLO which is robust against the parameterization used to model Δα<inf>had</inf>(t) in the MUonE kinematic region, thanks to the analyticity properties of Δα<inf>had</inf>(t), which can be expanded as a polynomial at t∼0.

Item Type:	Article
Uncontrolled Keywords:	5106 Nuclear and Plasma Physics, 5107 Particle and High Energy Physics, 51 Physical Sciences
Divisions:	Faculty of Science & Engineering > School of Physical Sciences
Depositing User:	Symplectic Admin
Date Deposited:	10 Jan 2024 09:33
Last Modified:	28 Feb 2026 14:50
DOI:	10.1016/j.physletb.2023.138344
Open Access URL:	https://pdf.sciencedirectassets.com/271623/1-s2.0-...
Related Websites:	Author Publisher
URI:	https://livrepository.liverpool.ac.uk/id/eprint/3177786
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