R. Murayama

activity

20132025

K_{L} \to π^{0} ν ν

and

K_{L} \to π^{0} X^{0}

Decays at the J-PARC KOTO Experiment

176 citations · 396 across the 12 of their papers we have counts for

collaborators

12 papers

nucl-ex2025★ 3 cited

Measurement of $^{3, 4}$ He( $K^{-}, π^{0}$ ) $_{Λ}^{3, 4}$ H reaction cross section and evaluation of hypertriton $Λ$ binding energy

T. Akaishi, H. Asano, X. Chen +32

Light $s$ -shell hypernuclei ( $_{Λ}^{3, 4} H$ ) and their ground-state properties are crucial benchmarks in hypernuclear physics. In particular, comparing the production cross sec…

nucl-ex2024

Measurement of the mesonic decay branch of the $K ˉ N N$ quasi-bound state

T. Yamaga, S. Ajimura, H. Asano +67

We conducted measurements of $K^{-} +^{3} He \to π Y N + N^{'}$ reactions using a $1 GeV / c$ $K^{-}$ -beam, with the objective of understanding the broad decay width of $\bar…

nucl-ex2023★ 3 cited

Precise lifetime measurement of $_{Λ}^{4}$ H hypernucleus using in-flight $^{4}$ He $(K^{-}, π^{0})_{Λ}^{4}$ H reaction

T. Akaishi, H. Asano, X. Chen +35

We present a new measurement of the $_{Λ}^{4}$ H hypernuclear lifetime using in-flight $K^{-}$ + $^{4}$ He $\to$ $_{Λ}^{4}$ H + $π^{0}$ reaction at the J-PARC hadron facility. We demonstrat…

nucl-ex2022★ 18 cited

Pole position of $Λ (1405)$ measured in $d (K^{-}, n) π Σ$ reactions

PARC E31 Collaboration, S. Aikawa, S. Ajimura +74

We measured a set of $π^{\pm} Σ^{\mp}$ , $π^{0} Σ^{0}$ , and $π^{-} Σ^{0}$ invariant mass spectra below and above the $K ˉ N$ mass threshold in $K^{-}$ -induced reactions on deuteron. We deduced th…

cond-mat.str-el2022

Muon-Spin Motion at the Crossover Regime between Gaussian and Lorentzian Distribution of Magnetic Fields

Muhamad Darwis Umar, Katsuhiko Ishida, Rie Murayama +7

The muon spin relaxation method (μSR) is a powerful microscopic tool to probe electronic states of materials observing local magnetic field distributions on the muon. It often happ…

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…

nucl-ex2016★ 21 cited

Interference effect between $ϕ$ and $Λ (1520)$ production channels in the $γ p \to K^{+} K^{-} p$ reaction near threshold

S. Y. Ryu, J. K. Ahn, T. Nakano +69

The $ϕ$ - $Λ (1520)$ interference effect in the $γ p \to K^{+} K^{-} p$ reaction has been measured for the first time in the energy range from 1.673 to 2.173 GeV. The relative phases between…

physics.ins-det2015★ 14 cited

Long-lived neutral-kaon flux measurement for the KOTO experiment

T. Masuda, J. K. Ahn, S. Banno +54

The KOTO ( $K^{0}$ at Tokai) experiment aims to observe the CP-violating rare decay $K_{L} \to π^{0} ν ν ˉ$ by using a long-lived neutral-kaon beam produced by the 30 GeV proton…

nucl-ex2013★ 81 cited

Search for $K^{-} pp$ bound state via $γ d \to K^{+} π^{-} X$ reaction at $E_{γ} = 1.5 - 2.4$ GeV

A. O. Tokiyasu, M. Niiyama, J. D. Parker +69

A search for $K^{-} pp$ bound state (the lightest kaonic nucleus) has been performed using the $γ d \to K^{+} π^{-} X$ reaction at E $_{γ}$ =1.5-2.4 GeV at LEPS/SPring-8. The diff…

Measurement of 3,4He(K−,π0)Λ3,4​H reaction cross section and evaluation of hypertriton Λ binding energy

Measurement of the mesonic decay branch of the KˉNN quasi-bound state

Precise lifetime measurement of Λ4​H hypernucleus using in-flight 4He(K−,π0)Λ4​H reaction

Pole position of Λ(1405) measured in d(K−,n)πΣ reactions

Muon-Spin Motion at the Crossover Regime between Gaussian and Lorentzian Distribution of Magnetic Fields

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

Interference effect between ϕ and Λ(1520) production channels in the γp→K+K−p reaction near threshold