Analysis and Preliminary Results of The NPDGamma Experiment

The NPDGamma Experiment measures the parity violating gamma asymmetry from polarized neutrons captured on protons at the Spallation Neutron Source at ORNL. The parity violating asymmetry $A_{\gamma}$ between the neutron spin and the photon momentum is proportional to the $\Delta I = 1$ long range weak meson coupling $h_{\pi}^1$ between nucleons in the hadronic weak interaction. Liquid para-hydrogen production data has been taken since May 2012 and will continue in 2014 to measure $A_{\gamma}$ to a precision of 1$\times$10$^{-8}$. Various aspects of the experiment, preliminary results, and plans to complete NPDGamma in 2014 will be discussed.