Faithin Omaha eBook Collection

Download or read book Measuring the Weak Charge of the Proton at Jefferson Lab written by and published by . This book was released on 2008 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: The JLab Q weak Collaboration is designing and constructing an experiment to measure the protonâ s weak charge, Q W p, by measuring the parity violating asymmetry in elastic electron-proton scattering at very low momentum transfer. The standard model predicts Q W p = 1 - 4 sin2 theta w from the running of the weak mixing angle sin2 theta w, corresponding to a 10sigma effect in the experiment. The experiment will determine Q W p with 4% combined statistical and systematic uncertainties, which leads to 0.3% uncertainty in sin2 theta w . Installation of the experiment will begin in September 2009.