Speaker
Dave Gaskell
(Jefferson Lab)
Description
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.
Author
Dave Gaskell
(Jefferson Lab)
