# Physics Beyond Colliders Kickoff Workshop

Sep 6 – 7, 2016
CERN
Europe/Zurich timezone
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## A space-like measurement of the leading hadronic corrections to the muon g-2 with a muon beam

Sep 7, 2016, 12:00 PM
20m
500/1-001 - Main Auditorium (CERN)

72
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### Speaker

Graziano Venanzoni (Istituto Nazionale Fisica Nucleare Frascati (IT))

### Description

The anomalous magnetic moment g-2 of the muon is a precision measurement which exhibits a 3.5$\sigma$ deviation between theory and experiment, and in the next few years will be measured at Fermilab and J-PARC with even higher precision.

The hadronic contribution to the muon g-2 ($a^{\rm HLO}_{\mu}$) is the most important one after the pure QED contribution. It is however affected by a large uncertainty which
dominates the error on the theoretical prediction in the Standard Model.
Considering the present observed deviation of the experimental measurement, it
is extremely important to get an independent measurement of the hadronic
contribution to g-2 to reduce its uncertainty.

We propose a novel approach to determine the leading hadronic corrections to the
muon g-2.
It consists in a measurement of the effective electromagnetic coupling in the
space-like region at low-momentum transfer.
We discuss the possibility to perform this measurement by taking advantage of
the high energy muon beam in the CERN North Area.
We plan to realize a fixed target scattering experiment aiming at achieving a
per mille accuracy on $a^{\rm HLO}_{\mu}$. Such an accuracy will allow an
alternative determination of this fundamental quantity competitive with the
present results obtained with the dispersive approach via time-like data.

Such precision would therefore allow a more stringent test of the Standard Model
when compared with the g-2 measurements expected at Fermilab and J-PARC.

### Primary author

Graziano Venanzoni (Istituto Nazionale Fisica Nucleare Frascati (IT))

### Co-authors

Clara Matteuzzi (Universita & INFN, Milano-Bicocca (IT)) Fulvio Piccinini (Universita e INFN, Pavia (IT)) Giovanni Abbiendi (Universita e INFN (IT)) Guido Montagna (University of Pavia e INFN, Pavia (IT)) Luca Trentadue (Universita & INFN, Milano-Bicocca (IT)) Massimo Passera (INFN Padova) Oreste Nicrosini (Dipartimento di Fisica Nucleare e Teorica) Roberto Tenchini (Universita di Pisa & INFN (IT)) Umberto Marconi (Universita e INFN (IT))

### Presentation materials

 gv_vpspace_cern_070916_v2.pdf mue_060916_final.pdf