# DIS 2015 - XXIII. International Workshop on Deep-Inelastic Scattering and Related Subjects

27 April 2015 to 1 May 2015
US/Central timezone

## The Q-Weak Experiment: Measurement of the Weak Charge of the Proton

29 Apr 2015, 11:10
17m
THEATER

### THEATER

WG3 Electroweak Physics and Beyond the Standard Model

### Speaker

The weak charge of the proton, $Q^p_{W}$, has been measured precisely for the first time at Jefferson Lab. The running of the weak mixing angle ($\sin^2\theta_W/2$), and thus $Q^p_{W}$, from the $Z$-pole to the low momentum transfers of this measurement is potentially sensitive through radiative corrections to new physics beyond the Standard Model. The Q-Weak experiment ran in Hall C from 2010-2012 and measured the parity-violating asymmetry in elastic electron-proton scattering at $Q^2$=0.025 (GeV/$c$)$^2$. This talk will present the initial results from this experiment from about 4% of the total data sample collected. $Q^p_W$ was extracted using this data point in combination with higher $Q^2$ parity-violating electron-scattering data and state-of-the-art theoretical calculations, used to constrain hadronic effects. The analysis status of the full data set, as well as several ancillary measurements will also be discussed.