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Measuring the leading hadronic contribution to the muon g-2 via μ\,e scattering

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arxiv 1609.08987 v2 pith:W2MVLI6S submitted 2016-09-28 hep-ex hep-ph

Measuring the leading hadronic contribution to the muon g-2 via μ\,e scattering

G. Abbiendi , C. M. Carloni Calame , U. Marconi , C. Matteuzzi , G. Montagna , O. Nicrosini , M. Passera , F. Piccinini
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R. Tenchini L. Trentadue G. Venanzoni
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classification hep-ex hep-ph
keywords muoncontributiondirecthadronicprocessscatteringwillachieved
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We propose a new experiment to measure the running of the fine-structure constant in the space-like region by scattering high-energy muons on atomic electrons of a low-Z target through the process $\mu e \to \mu e$. The differential cross section of this process, measured as a function of the squared momentum transfer $t=q^2<0$, provides direct sensitivity to the leading-order hadronic contribution to the muon anomaly $a^{\rm{HLO}}_{\mu}$. By using a muon beam of 150 GeV, with an average rate of $\sim1.3\times 10^7$ muon/s, currently available at the CERN North Area, a statistical uncertainty of $\sim 0.3\%$ can be achieved on $a^{\rm{HLO}}_{\mu}$ after two years of data taking. This direct measurement of $a^{\rm{HLO}}_{\mu}$ will provide an independent determination, competitive with the time-like dispersive approach, and consolidate the theoretical prediction for the muon $g$-2 in the Standard Model. It will allow therefore a firmer interpretation of the measurements of the future muon $g$-2 experiments at Fermilab and J-PARC.

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Cited by 5 Pith papers

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