J. A. Macdonald

activity

19972005

K^{+} \to π^{+} ν ν ˉ

in the momentum region P < 195 MeV/c

83 citations · 363 across the 9 of their papers we have counts for

collaborators

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9 papers · 1 filter

hep-ex2005★ 33 cited

Upper Limit on the Branching Ratio for the Decay $π^{0} \to ν ν ˉ$

E949 Collaboration, A. V. Artamonov

A sample of kinematically identified $K^{+} \to π^{+} π^{0}$ decays obtained with the E949 detector was used to search for the helicity-suppressed decay $π^{0} \to ν ν ˉ$ resulting in an…

hep-ex2005★ 39 cited

Search for the decay K+ to pi+ gamma gamma in the pi+ momentum region P>213 MeV/c

E949 Collaboration, A. V. Artamonov

We have searched for the K+ to pi+ gamma gamma decay in the kinematic region with pi+ momentum close to the end point. No events were observed, and the 90% confidence-level upper l…

hep-ex2004★ 83 cited

Further search for the decay $K^{+} \to π^{+} ν ν ˉ$ in the momentum region P < 195 MeV/c

E787 Collaboration

We report the results of a search for the decay $K^{+} \to π^{+} ν ν ˉ$ in the kinematic region with $π^{+}$ momentum $140 < P < 195$ MeV/c using the data collected by the E787 experim…

hep-ex2003★ 9 cited

First measurement of the T-violating muon polarization in the decay K^+ --> mu^+ nu gamma

V. V. Anisimovsky, A. N. Khotjantsev, A. P. Ivashkin

We present the result of the first measurement of the T-violating muon polarization P_T in the decay K^+ --> mu^+ nu gamma. This polarization is sensitive to new sources of CP-viol…

hep-ex2002★ 10 cited

Measurement of direct photon emission in $K^{+} \to π^{+} π^{0} γ$ decay using stopped positive kaons

Suguru Shimizu, for KEK-E470 Collaboration

The radiative decay $K^{+} \to π^{+} π^{0} γ$ ( $K_{π 2 γ}$ ) has been measured with stopped positive kaons. A $K_{π 2 γ}$ sample containing 4k events was analyzed, and the $K_{π 2 γ}$ branch…

hep-ex2000★ 35 cited

Measurement of Structure Dependent K^+ -> mu^+ nu gamma

E787 Collaboration

We report the first measurement of a structure dependent component in the decay K^+ -> mu^+ nu gamma. Using the kinematic region where the muon kinetic energy is greater than 137 M…

hep-ex2000★ 77 cited

Further Search for the Decay K^+ --> pi^+ nu nubar

E787 collaboration

A search for additional evidence for the rare kaon decay K^+ --> pi^+ nu nubar has been made with a new data set comparable in sensitivity to the previous exposure that produced a…

hep-ex1997★ 33 cited

Observation of the Decay K+ --> pi+ mu+ mu-

E787 Collaboration, S. Adler, M. S. Atiya +37

We have observed the rare decay K+ --> pi+ mu+ mu- and measured the branching ratio Gamma(K+ --> pi+ mu+ mu-)/Gamma(K+ --> all) = (5.0 +/- 0.4 (stat.) +/- 0.7 (sys.) +/- 0.6 (theor…

hep-ex1997★ 44 cited

Observation of the Decay K^+ --> pi^+ gamma gamma

E787 Collaboration, P. Kitching, T. Nakano +37

The first observation of the decay K^+ --> pi^+ gamma gamma is reported. A total of 31 events was observed with an estimated background of 5.1 +- 3.3 events in the pi+ momentum ran…