Precision Measurements of Neutral Pion Electroproduction Near Threshold

Download or read book Precision Measurements of Neutral Pion Electroproduction Near Threshold written by and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: Preliminary results are presented from an experiment to measure [pi]° electroproduction at and above threshold using the p(e;e' p)[pi]° reaction. The data were taken at a beam energy of 1192 MeV using a two-spectrometer setup in Hall A at Jefferson Lab. For the first time in [pi]° threshold electroproduction, complete coverage of the [phi]{sub [pi]}* and [theta]{sub [pi]}* angles in the center-of-mass (C.M.) was obtained for the invariant mass region up to [Delta]W=18 MeV above the [pi]° threshold. At the same time our invariant momentum transfer squared covers the range Q2 = 0.05-0.15 (GeV/c)2 with twelve bins in Q2. The improved kinematic coverage in C.M., W and Q2 will better constrain theoretical interpretations of the data using phenomenological models and QCD-inspired models such as Heavy Baryon Chiral Perturbation Theory.