New constraint on the existence of the mu+-> e+ gamma decay
High Energy Physics - Experiment
2013-04-25 v2 Instrumentation and Detectors
Abstract
The analysis of a combined data set, totaling 3.6 \times 10^14 stopped muons on target, in the search for the lepton flavour violating decay mu^+ -> e^+ gamma is presented. The data collected by the MEG experiment at the Paul Scherrer Institut show no excess of events compared to background expectations and yield a new upper limit on the branching ratio of this decay of 5.7 \times 10^-13 (90% confidence level). This represents a four times more stringent limit than the previous world best limit set by MEG.
Keywords
Cite
@article{arxiv.1303.0754,
title = {New constraint on the existence of the mu+-> e+ gamma decay},
author = {MEG Collaboration and J. Adam and X. Bai and A. M. Baldini and E. Baracchini and C. Bemporad and G. Boca and P. W. Cattaneo and G. Cavoto and F. Cei and C. Cerri and A. de Bari and M. De Gerone and T. Doke and S. Dussoni and J. Egger and K. Fratini and Y. Fujii and L. Galli and G. Gallucci and F. Gatti and B. Golden and M. Grassi and A. Graziosi and D. N. Grigoriev and T. Haruyama and M. Hildebrandt and Y. Hisamatsu and F. Ignatov and T. Iwamoto and D. Kaneko and P. -R. Kettle and B. I. Khazin and N. Khomotov and O. Kiselev and A. Korenchenko and N. Kravchuk and G. Lim and A. Maki and S. Mihara and W. Molzon and T. Mori and D. Mzavia and R. Nardo and H. Natori and D. Nicolo and H. Nishiguchi and Y. Nishimura and W. Ootani and M. Panareo and A. Papa and R. Pazzi and G. Piredda and A. Popov and F. Renga and E. Ripiccini and S. Ritt and M. Rossella and R. Sawada and F. Sergiampietri and G. Signorelli and S. Suzuki and F. Tenchini and C. Topchyan and Y. Uchiyama and R. Valle and C. Voena and F. Xiao and S. Yamada and A. Yamamoto and S. Yamashita and Z. You and Yu. V. Yudin and D. Zanello},
journal= {arXiv preprint arXiv:1303.0754},
year = {2013}
}
Comments
5 pages, 3 figures, a version accepted in Phys. Rev. Lett