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 $e e$. 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 $a^HLO_\mu$.
By using a muon beam of 150 GeV, with an average rate of $\sim1.310^7$
muon/s, currently available at the CERN North Area, a statistical uncertainty
of $0.3\%$ can be achieved on $a^HLO_\mu$ after two years of data
taking. This direct measurement of $a^HLO_\mu$ 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.
Description
Measuring the leading hadronic contribution to the muon g-2 via $\mu\,e$ scattering
%0 Generic
%1 abbiendi2016measuring
%A Abbiendi, G.
%A Calame, C. M. Carloni
%A Marconi, U.
%A Matteuzzi, C.
%A Montagna, G.
%A Nicrosini, O.
%A Passera, M.
%A Piccinini, F.
%A Tenchini, R.
%A Trentadue, L.
%A Venanzoni, G.
%D 2016
%K alphaqed g-2
%R 10.1140/epjc/s10052-017-4633-z
%T Measuring the leading hadronic contribution to the muon g-2 via $\mu\,e$
scattering
%U http://arxiv.org/abs/1609.08987
%X 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 $e e$. 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 $a^HLO_\mu$.
By using a muon beam of 150 GeV, with an average rate of $\sim1.310^7$
muon/s, currently available at the CERN North Area, a statistical uncertainty
of $0.3\%$ can be achieved on $a^HLO_\mu$ after two years of data
taking. This direct measurement of $a^HLO_\mu$ 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.
@misc{abbiendi2016measuring,
abstract = {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.},
added-at = {2020-03-20T16:35:09.000+0100},
author = {Abbiendi, G. and Calame, C. M. Carloni and Marconi, U. and Matteuzzi, C. and Montagna, G. and Nicrosini, O. and Passera, M. and Piccinini, F. and Tenchini, R. and Trentadue, L. and Venanzoni, G.},
biburl = {https://www.bibsonomy.org/bibtex/2b11395059a2ce388956cd6b77078fd43/cmcneile},
description = {Measuring the leading hadronic contribution to the muon g-2 via $\mu\,e$ scattering},
doi = {10.1140/epjc/s10052-017-4633-z},
interhash = {f5337d3518f38313a8970ad06c0b94e2},
intrahash = {b11395059a2ce388956cd6b77078fd43},
keywords = {alphaqed g-2},
note = {cite arxiv:1609.08987Comment: 8 pages, 4 figures},
timestamp = {2020-03-20T16:35:09.000+0100},
title = {Measuring the leading hadronic contribution to the muon g-2 via $\mu\,e$
scattering},
url = {http://arxiv.org/abs/1609.08987},
year = 2016
}