Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1996-09-10
Phys.Rev.D55:2517-2520,1997
Physics
High Energy Physics
High Energy Physics - Phenomenology
10 pages, 2 figures, also available via anonymous ftp at ftp://ftp.kek.jp/kek/preprints/TH/TH-493
Scientific paper
10.1103/PhysRevD.55.2517
A search for the lepton-flavor violating $\mu^{+}\rightarrow e^{+}\gamma$ decay using polarized muons is revisited in terms of suppression of the serious background arising from an accidental coincidence between a $e^{+}$ in the normal muon decay and a high energy photon in the radiative muon decay, $\mu^{+} \rightarrow e^{+} \nu \overline{\nu} \gamma$. It is found that a high energy photon in $\mu^{+} \rightarrow e^{+} \nu \overline{\nu} \gamma$ decay is preferentially emitted parallel to the muon spin direction, similarly to $e^{+}$ in the normal muon decay. The selective measurements of either $e^{+}$s or photons moving antiparallel to the muon spin direction would suppress the accidental background for $\mu^{+} \rightarrow e^{+} \gamma$ with right-handed and left-handed $e^{+}$s respectively.
Kuno Yoshitaka
Maki Akihiro
Okada Yasuhiro
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