Determination of the Charged Pion Form Factor at Q2

Download or read book Determination of the Charged Pion Form Factor at Q2 written by and published by . This book was released on 2006 with total page 192001 pages. Available in PDF, EPUB and Kindle. Book excerpt: The H(e, e(prime)pi+)n cross section was measured at four-momentum transfers of Q2=1.60 and 2.45 GeV2 at an invariant mass of the photon nucleon system of W=2.22 GeV. The charged pion form factor (F{sub pi}) was extracted from the data by comparing the separated longitudinal pion electroproduction cross section to a Regge model prediction in which F{sub pi} is a free parameter. The results indicate that the pion form factor deviates from the charge-radius constrained monopole form at these values of Q2 by one sigma, but is still far from its perturbative Quantum Chromo-Dynamics prediction.