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Search for up-down quark mass differences via isospin symmetry breaking |
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| Institution: | a Institut für Kernphysik Forschungszentrum Jülich, Jülich, Germany b Zentrallabor für Elektronik, Forschungszentrum Jülich, Jülich, Germany c Institute of Physics, Jagellonian University, Krakow, Poland d Institute of Nuclear Physics, Krakow, Poland e Institute of Nuclear Physics and Nuclear Energy, Sofia, Bulgaria f Physics Faculty, university of Sofia, Sofia, Bulgaria g Institut für Strahlen- und Kernphysik der Universität Bonn, Bonn, Germany h Institut für Kernphysik, Universität Münster, Münster, Germany i Nuclear Physics Division, BARC, Bombay, India j Physics Department, George Mason University, Fairfax, Virginia, USA k IUCF, Indiana University, Bloomington, Indiana, USA l P.J. Safarik University, Kosice, Slovakia m Technical University, Kosice, Kosice, Slovakia n Laboratory for High Energies, JINR Dubna, Russia |
| Abstract: | We performed a series of experiments employing the two pion production reactions p + d → 3He + π0 and p + d → 3H + π+. The two isopin related reactions differ by a Clebsch Gordan coefficient of 2. We searched for deviations in this ratio in complete angular distributions in the range of the Δ excitation as well as in the vicinity of the η production threshold. |
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