Download or read book Search for New Spin-0 Particles Near [pi]0 Mass Produced in Association with [tau] Pairs at BABAR written by Alexandre Beaulieu and published by . This book was released on 2013 with total page pages. Available in PDF, EPUB and Kindle. Book excerpt: This research project searches for new physics in the t sector that would resolve the tension between BABAR measurement for the pion-photon transition form factor F?0(Q2) and the standard model asymptotic prediction. This behaviour could be explained by a new light pseudo-scalar state that mixes with the ?0 and enhances its coupling to the c and b quarks or the t lepton, or by a new spin-0 particle with mass very close to the ?0. We examine one channel to test for existence of such objects: their creation in association with t pairs in e+e- collisions. The analysis uses a typical cut-based approach as the large predicted cross-sections and the kinematics of the final states allow for a direct selection of signal events and background suppression. Current simulation studies predict a 90% CL limit on the production cross-section on the order of 100 fb in case of no signal, while the theory predicts production cross-sections on the order of 1 pb to 100 pb depending on the model.