T. Shinkawa

activity

20002022

most citedStudy of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c

333 citations · 1.3k across the 23 of their papers we have counts for

collaborators

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19 papers · 1 filter

hep-ex2022★ 3 cited

Search for the Pair Production of Dark Particles $X$ with $K_{L}^{0} \to X X$ , $X \to γ γ$

C. Lin, J. K. Ahn, J. M. Choi +39

We present the first search for the pair production of dark particles $X$ via $K_{L}^{0} \to X X$ with $X$ decaying into two photons using the data collected by the KOTO experiment. No s…

hep-ex2020★ 57 cited

Study of the $K_{L} \to π^{0} ν ν$ Decay at the J-PARC KOTO Experiment

KOTO Collaboration, J. K. Ahn, B. Beckford +68

The rare decay $K_{L} \to π^{0} ν ν$ was studied with the dataset taken at the J-PARC KOTO experiment in 2016, 2017, and 2018. With a single event sensitivity of $( 7.20 \p…

hep-ex2020★ 3 cited

First Search for the $K_{L} \to π^{0} γ$ Decay

J. K. Ahn, B. Beckford, M. Campbell +59

We report the first search for the $K_{L} \to π^{0} γ$ decay, which is forbidden by Lorentz invariance, using the data from 2016 to 2018 at the J-PARC KOTO experiment. With a single ev…

hep-ex2018★ 176 cited

Search for $K_{L} \to π^{0} ν ν$ and $K_{L} \to π^{0} X^{0}$ Decays at the J-PARC KOTO Experiment

KOTO Collaboration, J. K. Ahn, B. Beckford +67

A search for the rare decay $K_{L} \to π^{0} ν ν$ was performed. With the data collected in 2015, corresponding to $2.2 \times 1 0^{19}$ protons on target, a single event se…

hep-ex2016★ 20 cited

A new search for the $K_{L} \to π^{0} ν ν$ and $K_{L} \to π^{0} X^{0}$ decays

J. K. Ahn, K. Y. Baek, S. Banno +87

We searched for the $C P$ -violating rare decay of neutral kaon, $K_{L} \to π^{0} ν ν$ , in data from the first 100 hours of physics running in 2013 of the J-PARC KOTO experimen…

hep-ex2016★ 13 cited

Search for the rare decay $K^{+} \to μ^{+} ν ν ˉ ν$

A. V. Artamonov, B. Bassalleck, B. Bhuyan +57

Evidence of the $K^{+} \to μ^{+} ν ν ˉ ν$ decay was searched for using E949 experimental data with an exposure of $1.70 \times 1 0^{12}$ stopped kaons. The data sample is dominated by the b…

hep-ex2014★ 102 cited

Search for heavy neutrinos in $K^{+} \to μ^{+} ν_{H}$ decays

A. V. Artamonov, B. Bassalleck, B. Bhuyan +57

Evidence of a heavy neutrino, $ν_{H}$ , in the $K^{+} \to μ^{+} ν_{H}$ decays was sought using the E949 experimental data with an exposure of $1.70 \times 1 0^{12}$ stopped kaons. With the major…

hep-ex2011★ 15 cited

Study of the K0(L) --> pi0 pi0 nu nu-bar decay

E391a Collaboration, R. Ogata, S. Suzuki +67

The rare decay K0(L) --> pi0 pi0 nu nu-bar was studied with the E391a detector at the KEK 12-GeV proton synchrotron. Based on 9.4 x 10^9 K0L decays, an upper limit of 8.1 x 10^{-7}…

hep-ex2010★ 4 cited

Search for the decay $K_{L}^{0} \to 3 γ$

Y. C. Tung, Y. B. Hsiung, J. K. Ahn +66

We performed a search for the decay $K_{L}^{0} \to 3 γ$ with the E391a detector at KEK. In the data accumulated in 2005, no event was observed in the signal region. Based on the…

hep-ex2010★ 3 cited

Measurement of the K+ -> pi0 mu+ nu_mu gamma Branching Ratio

The E787 Collaboration

A measurement of the decay K+ -> pi0 mu+ nu_mu gamma has been performed with the E787 detector at Brookhaven National Laboratory. Forty events were observed in the signal region wi…

hep-ex2009★ 111 cited

Experimental study of the decay $K_{L}^{0} \to π^{0} ν ν ˉ$

The E391a Collaboration, J. K. Ahn

The first dedicated search for the rare neutral-kaon decay $K_{L}^{0} \to π^{0} ν ν ˉ$ has been carried out in the E391a experiment at the KEK 12-GeV proton synchrotron. The final upper li…

hep-ex2009★ 333 cited

Study of the decay K+ => pi+,nu,nubar in the momentum region 140<Ppi<199 MeV/c

E949 Collaboration, A. V. Artamonov, B. Bassalleck +60

Experiment E949 at Brookhaven National Laboratory has observed three new events consistent with the decay K+ => pi+,nu,nubar in the pion momentum region 140 < P_pi < 199 MeV/c in a…

hep-ex2008★ 23 cited

Search for a light pseudoscalar particle in the decay $K_{L}^{0} \to π^{0} π^{0} X$

Y. C. Tung, Y. B. Hsiung, M. L. Wu +59

We performed a search for a light pseudoscalar particle $X$ in the decay $K_{L}^{0} - > p i 0 p i 0 X$ , $X - > γ γ$ with the E391a detector at KEK. Such a particle with a mass of 214.3 MeV/ $c^{2}$ wa…

hep-ex2008★ 236 cited

New measurement of the K+ => pi+,nu,nubar branching ratio

E949 Collaboration

Three events for the decay K+ => pi+,nu,nubar have been observed in the pion momentum region below the K+ => pi+,pi0 peak, 140 < P_pi < 199 MeV/c, with an estimated background of 0…

hep-ex2007

Measurement of the $K^{+} \to π^{+} ν ν ˉ$ Branching Ratio

The E949 Collaboration

Experiment E949 at Brookhaven National Laboratory studied the rare decay $K^+\toπ^+ν\barν $an d o t h er p r ocesses w i t han e x p os u r eo f$ 1.77\times 10^{12}K^+$'s. The data were anal…

hep-ex2007★ 8 cited

First search for $K_{L} \to π^{0} π^{0} ν ν ˉ$

J. Nix

The first search for the rare kaon decay $\kppnn$ has been performed by the E391a collaboration at the KEK 12-GeV proton synchrotron. An upper limit of $4.7 \times 1 0^{- 5}$ at the 90…

hep-ex2004★ 142 cited

Improved Measurement of the K+ to pi+ nu nubar Branching Ratio

E949 Collaboration, A. V. Artamonov

An additional event near the upper kinematic limit for K+ to pi+ nu nubar has been observed by Experiment E949 at Brookhaven National Laboratory. Combining previously reported and…

hep-ex2001★ 5 cited

Search for the rare decay K+ -> pi+ gamma

E787 Collaboration

We have performed a search for the angular-momentum forbidden decay K+ -> pi+ gamma with the E787 detector at BNL. No events were observed in the pi+ kinematic region around 227 Me…

hep-ex2000★ 21 cited

Search for the Decay K+ -> pi+ pi0 nu nubar

E787, :, S. Adler +45

The first search for the decay K^+ -> pi^+ pi^0 nu nubar has been performed with the E787 detector at BNL. Based on zero events observed in the kinematical search region defined by…

Search for the Pair Production of Dark Particles X with KL0​→XX, X→γγ

Study of the KL​→π0νν Decay at the J-PARC KOTO Experiment

First Search for the KL​→π0γ Decay

Search for KL​→π0νν and KL​→π0X0 Decays at the J-PARC KOTO Experiment

A new search for the KL​→π0νν and KL​→π0X0 decays

Search for the rare decay K+→μ+ννˉν

Search for heavy neutrinos in K+→μ+νH​ decays