Y. Sugaya

activity

19952026

most citedExperimental study of the decay

K_{L}^{0} \to π^{0} ν ν ˉ

111 citations · 726 across the 43 of their papers we have counts for

collaborators

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18 papers · 1 filter

nucl-ex2026

Direct measurement of the in-medium $η^{'}$ mass spectrum through the $γ γ$ decay channel

Y. Matsumura, N. Muramatsu, T. A. Hashimoto +58

We measured the invariant mass of the $η^{'} (958)$ meson through the $η^{'} \to γ γ$ decay channel to search for possible character change of $η^{'}$ in a nuclear mediu…

nucl-ex2026

Comprehensive measurement of $η^{'}$ photoproduction off the proton at $E_{γ} < 2.4$ $GeV$

N. Muramatsu, J. K. Ahn, W. C. Chang +61

For the spectroscopy of nucleon resonances at the total energies from the $η^{'}$ -meson production threshold to $2.32$ $GeV$ , photon beam asymmetries of the reaction $γ…

nucl-ex2022★ 9 cited

Differential cross sections and photon beam asymmetries of $η$ photoproduction on the proton at $E_{γ}$ = 1.3-2.4 GeV

T. Hashimoto, T. Nam, N. Muramatsu +57

We have carried out exclusive measurements for the photoproduction of an $η$ meson from a proton target with an egg-shaped calorimeter made of BGO crystals (BGOegg) and forward cha…

nucl-ex2020★ 25 cited

Search for $η^{'}$ bound nuclei in the $^{12} C (γ, p)$ reaction with simultaneous detection of decay products

N. Tomida, N. Muramatsu, M. Niiyama +60

We measured missing mass spectrum of the $^{12} C (γ, p)$ reaction for the first time in coincidence with potential decay products from $η^{'}$ bound nuclei. We tagged an ( $η + p$ ) p…

nucl-ex2018★ 9 cited

Differential cross section and photon-beam asymmetry for the gamma p -> pi- Delta++(1232) reaction at forward pi- angles for Egamma=1.5-2.95 GeV

H. Kohri, S. H. Shiu, W. C. Chang +46

Differential cross sections and photon-beam asymmetries for the gamma p -> pi- Delta++(1232) reaction have been measured for 0.7<cos(theta)<1 and Egamma=1.5-2.95 GeV at SPring-8/LE…

nucl-ex2017★ 21 cited

Photoproduction of $Λ$ and $Σ^{0}$ hyperons off protons with linearly polarized photons at $E_{γ} = 1.5 - 3.0$ GeV

S. H. Shiu, H. Kohri, W. C. Chang +42

We report the measurement of the $γ p \to K^{+} Λ$ and $γ p \to K^{+} Σ^{0}$ reactions at SPring-8. The differential cross sections and photon-beam asymmetries are meas…

nucl-ex2017★ 17 cited

First measurement of coherent $ϕ$ -meson photoproduction from helium-4 near threshold

LEPS Collaboration, T. Hiraiwa, M. Yosoi +42

The differential cross sections and decay angular distributions for coherent $ϕ$ -meson photoproduction from helium-4 have been measured for the first time at forward angles with li…

nucl-ex2017★ 17 cited

$ϕ$ photoproduction on the proton at $E_{γ}$ = 1.5 - 2.9 GeV

K. Mizutani, M. Niiyama, T. Nakano +53

Differential cross sections at $t = t_{min}$ and decay asymmetries for the $γ p \to ϕp$ reaction have been measured using linearly polarized photons in the range 1.5 to 2…

nucl-ex2017★ 12 cited

Differential cross section and photon beam asymmetry for the gamma p -> pi+ n reaction at forward pi+ angles at Egamma=1.5-2.95 GeV

H. Kohri, S. Y. Wang, S. H. Shiu +46

Differential cross sections and photon beam asymmetries for the gamma p -> pi+ n reaction have been measured for 0.6<cos(theta)<1 and Egamma=1.5-2.95 GeV at SPring-8/LEPS. The cros…

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…

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…

nucl-ex2013★ 13 cited

Backward-angle photoproduction of $ω$ and $η^{'}$ mesons from protons at $E_{γ} = 1.5 - 3.0$ GeV

Y. Morino, Y. Nakatsugawa, M. Yosoi +47

We report the measurement of differential cross sections for $ω$ and $η^{'}$ photoproduction from protons at backward angles ( $- 1.0 < cos Θ_{C . M}^{X} < - 0.8$ ) using linearly polarized pho…

nucl-ex2010★ 31 cited

Measurement of Spin-Density Matrix Elements for $ϕ$ -Meson Photoproduction from Protons and Deuterons Near Threshold

W. C. Chang, D. S. Ahn, J. K. Ahn +53

The LEPS/SPring-8 experiment made a comprehensive measurement of the spin-density matrix elements for $γ p \to ϕp$ , $γ d \to ϕp n$ and $γ d \to ϕ d$ at forward production angles. A lin…

nucl-ex2009★ 35 cited

Backward-angle photoproduction of eta meson from protons at E_gamma = 1.6 - 2.4 GeV

M. Sumihama, D. S. Ahn, J. K. Ahn +48

Differential cross sections for eta photoproduction off protons have been measured at E_gamma = 1.6 - 2.4 GeV in the backward direction. A bump structure has been observed above 2.…

nucl-ex2009★ 28 cited

Measurement of the incoherent $γ d \to ϕp n$ photoproduction near threshold

W. C. Chang, M. Miyabe, T. Nakano +52

We report measurements of differential cross sections and decay asymmetries of incoherent $ϕ$ -meson photoproduction from the deuteron at forward angles using linearly polarized pho…

nucl-ex2008★ 2 cited

Differential cross section and analyzing power of the $p p \to pp π^{0}$ reaction at a beam energy of 390 MeV

Y. Maeda, M. Segawa, T. Ishida +9

The differential cross section and analyzing power $A_{y}$ of the $p p \to pp π^{0}$ reaction have been measured at RCNP in coplanar geometry at a beam energy of 390 MeV and the d…

nucl-ex2007★ 32 cited

Measurement of the $γ p \to K^{+} Λ$ Reaction at Backward Angles

K. Hicks, T. Mibe, M. Sumihama

Cross sections for the $γ p \to K^{+} Λ$ have been measured at backward angles using linearly polarized photons in the range 1.50 to 2.37 GeV. In addition, the beam asymmetry for this…

nucl-ex2006★ 18 cited

Multi-layer scintillation detector for the MOON double beta decay experiment: Scintillation photon responses studied by a prototype detector MOON-1

H. Nakamura, P. Doe, H. Ejiri +50

An ensemble of multi-layer scintillators is discussed as an option of the high-sensitivity detector Mo Observatory Of Neutrinos (MOON) for spectroscopic measurements of neutrino-le…

Direct measurement of the in-medium η′ mass spectrum through the γγ decay channel

Comprehensive measurement of η′ photoproduction off the proton at Eγ​<2.4 GeV

Differential cross sections and photon beam asymmetries of η photoproduction on the proton at Eγ​ = 1.3-2.4 GeV

Search for η′ bound nuclei in the 12C(γ,p) reaction with simultaneous detection of decay products

Differential cross section and photon-beam asymmetry for the gamma p -> pi- Delta++(1232) reaction at forward pi- angles for Egamma=1.5-2.95 GeV

Photoproduction of Λ and Σ0 hyperons off protons with linearly polarized photons at Eγ​=1.5−3.0 GeV

First measurement of coherent ϕ-meson photoproduction from helium-4 near threshold

ϕ photoproduction on the proton at Eγ​ = 1.5 - 2.9 GeV