Gauge Invariance of the Muonium-Antimuonium Oscillation Time Scale and Limits on Right-Handed Neutrino Masses
arXiv:0806.0884 · doi:10.1142/S021773230903000X
Abstract
The gauge invariance of the muonium-antimuonium () oscillation time scale is explicitly demonstrated in the Standard Model modified only by the inclusion of singlet right-handed neutrinos and allowing for general renormalizable interactions. The see-saw mechanism is exploited resulting in three light Majorana neutrinos and three heavy Majorana neutrinos with mass scale . The leading order matrix element contribution to the oscillation process is computed in gauge and shown to be independent thereby establishing the gauge invariance to this order. Present experimental limits resulting from the non-observation of the oscillation process sets a lower limit on roughly of order 600 GeV.
arXiv comment17 pages, 6 figures, Latex
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