arXiv subjects

Y. Miyazaki

Publications and source records attributed to Y. Miyazaki.

41 records · Page 3Linked to original sources

arXiv2008

Search for Lepton-Flavor-Violating tau Decays into a Lepton and an f0(980) Meson

We search for lepton-flavor-violating tau decays into a lepton (electron or muon) and an f0(980) meson using 671 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. No events are observed and we set the following 90% C.L. upper limits on the branching fraction products: B(tau- -> e-f0(980))*B(f0(980)->pi+pi-)<3.2x10^-8 and B(tau- -> mu-f0(980))*B(f0(980) -> pi+pi-)<3.4x10^-8. This is the first search performed for these modes.

hep-ex↗

arXiv2007

Search for Lepton Flavor Violating tau Decays into Three Leptons

We search for lepton-flavor-violating tau decays into three leptons (electron or muon) using 535 fb-1 of data collected with the Belle detector at the KEKB asymmetric-energy e+e- collider. No evidence for these decays is observed, and we set 90% confidence level upper limits on the branching fractions of (2.0-4.1)x10^-8. These results improve upon our previously published upper limits by factors of 4.9 to 10.

hep-ex↗

arXiv2007

Search for Lepton Flavor Violating tau^- Decays into \ell^-η, \ell^-η' and \ell^-π^0

We have searched for lepton-flavor-violating $τ$ decays with a pseudoscalar meson ($η$, $η'$ {and} $π^0$) using a data sample of 401 fb$^{-1}$ collected with the Belle detector at the KEKB asymmetric-energy $e^+e^-$ collider. No evidence for these decays is found and we set the following upper limits on the branching fractions: ${\cal{B}}(τ^-\to e^-η) < 9.2\times 10^{-8}$, ${\cal{B}}(τ^-\to μ^-η) < 6.5\times 10^{-8}$, ${\cal{B}}(τ^-\to e^-η') < 1.6\times 10^{-7}$, ${\cal{B}}(τ^-\to μ^-η') < 1.3\times 10^{-7}$, ${\cal{B}}(τ^-\to e^-π^0) < 8.0\times 10^{-8}$ and ${\cal{B}}(τ^-\to μ^-π^0) < 1.2\times 10^{-7}$ at the 90% confidence level. These results improve our previously published upper limits by factors from 2.3 to 6.3.

hep-ex↗

arXiv2006

Search for Lepton Flavor Violating tau- Decays Including with a K0s Meson

We have searched for the lepton flavor violating decays $τ^-\to \ell^-\ks$ ($\ell = e {or} μ$), using a data sample of 281 fb$^{-1}$ collected with the Belle detector at the KEKB $e^+e^-$ asymmetric-energy collider. No evidence for a signal was found in either of the decay modes, and we set the following upper limits for the branching fractions: ${\cal{B}}(τ^-\to e^-\ks) < 5.6\times 10^{-8}$ and ${\cal{B}}(τ^-\to μ^-\ks) < 4.9\times 10^{-8}$ at the 90% confidence level. These results improve the previously published limits set by the CLEO collaboration by factors of 16 and 19, respectively.

hep-ex↗

arXiv2005

Search for Lepton and Baryon Number Violating tau- Decays into Lambda-bar pi- and Lambda pi-

We have searched for tau lepton decays, tau- -> Lambda-bar pi- and tau- -> Lambda pi-, that simultaneously violate the conservation of the lepton and baryon number using a data sample of 154 fb^{-1} collected with the Belle detector at the KEKB e+e- asymmetric-energy collider. No evidence for a signal was found in either of the decay modes and we set the following upper limits for the branching fractions: B(tau^- -> Lambda-barπ-) < 1.4 * 10^{-7} and B(tau^- -> Lambda pi^-) < 0.72 * 10^{-7} at the 90% confidence level. This is the first search ever performed for these modes.

hep-ex↗