Radiative tau lepton pair production as a probe of anomalous electromagnetic couplings of the tau |
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| Institution: | 1. School of Physics and Electronics, Central South University, Changsha 410083, China;2. IFIC, Centro Mixto Universidad de Valencia-CSIC, Institutos de Investigación de Paterna, Aptdo. 22085, 46071 Valencia, Spain;3. Departamento de Física Teórica, Universidad de Valencia, Spain;4. Department of Physics, Guangxi Normal University, Guilin 541004, China;1. Consortium for Fundamental Physics, School of Physics and Astronomy, The University of Manchester, Manchester M13 9PL, United Kingdom;2. Faculty of Physics, University of Warsaw, Pasteura 5, 02-093 Warsaw, Poland;1. Northwestern University, Evanston, IL 60208, USA;2. Wayne State University, Detroit, MI 48202, USA;1. Tsung-Dao Lee Institute, KLPAC and SKLPPC laboratories, School of Physics and Astronomy, Shanghai Jiao Tong University, Shanghai 200240, China;2. Gayungsari III/20, Surabaya 60235, Indonesia;3. School of Physics and Astronomy, Monash University, Melbourne VIC-3800, Australia |
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| Abstract: | We calculate the squared matrix element for the process e+e− → τ+τ−γ allowing for anomalous magnetic and electric dipole moments at the ττγ vertex. No interferences are neglected and no approximations of light fermion masses are made. We show that anomalous moments affect not only the cross section, but also the shape of the photon energy and angular distributions. We also demonstrate that in the case of the anomalous magnetic dipole moment, the contribution from interference involving Standard Model and anomalous amplitudes is significant compared to the contribution from anomalous amplitudes alone. A program to perform the calculation is available and it may be employed as a Monte Carlo generator. |
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