JAEA
  • help
  • PC | SP
  • JP | EN
          
検索対象：     
報告書番号：
※ 半角英数字
 年 ～ 
 年
全てクリア
検索結果：　5 件中 1件目～5件目を表示
  • 1

発表形式

Initialising ...

選択項目を絞り込む

掲載資料名

Initialising ...

発表会議名

Initialising ...

筆頭著者名

Initialising ...

キーワード

Initialising ...

発表言語

Initialising ...

発行年

Initialising ...

開催年

Initialising ...

選択した検索結果をダウンロード

論文

First measurement of differential cross sections and photon beam asymmetries for photoproduction of the $$f_0$$ (980) meson decaying into $$pi^0 pi^0$$ at $$E_gamma <$$ 2.4 GeV

村松 憲仁*; 土川 雄介; LEPS2 BGOegg Collaboration*; 他61名*

Physical Review C, 107(4), p.L042201_1 - L042201_5, 2023/04

https://doi.org/10.1103/PhysRevC.107.L042201
 被引用回数：5 パーセンタイル：49.60(Physics, Nuclear)

For the first time, differential cross sections and photon beam asymmetries were measured for the reaction $$gamma p to f_0 (980) p to pi^0 pi^0 p$$ by using a linearly polarized photon beam up to 2.4 GeV and a liquid hydrogen target. The $$f_0$$ (980) photoproduction signal was clearly observed owing to the absence of contributions from vector-meson photoproduction. The results indicate the $$t$$-channel exchange of vector mesons as a mechanism of the $$f_0$$ (980) photoproduction at $$E_gamma$$ approximate to 2.1 GeV, putting constraints on the nature of $$f_0$$ (980).

論文

Differential cross sections, photon beam asymmetries, and spin density matrix elements of $$omega$$ photoproduction off the proton at $$E_gamma$$ = 1.3-2.4 GeV

村松 憲仁*; 土川 雄介; LEPS2/BGOegg Collaboration*; 他59名*

Physical Review C, 102(2), p.025201_1 - 025201_10, 2020/08

https://doi.org/10.1103/PhysRevC.102.025201
 被引用回数：11 パーセンタイル：65.03(Physics, Nuclear)

For the reaction $$gamma p to omega p$$, differential cross sections, photon beam asymmetries, and spin density matrix elements have been measured in the BGOegg experiment at the SPring-8 LEPS2 beamline by using a large acceptance electromagnetic calorimeter. A 1.3-2.4 GeV photon beam with high linear polarization has enabled a precision measurement of photon beam asymmetries $$Sigma$$ and polarized spin density matrix elements $$rho^1_{1-1}$$ over a wide angular range, especially above the total energy of about 2 GeV for the first time. The measured $$rho^1_{1-1}$$ indicates the dominance of $$s$$-channel resonances even at higher energies. The $$Sigma$$ values at backward angles are not reproduced by the existing partial-wave analysis in the highest-energy region, providing new constraints to the contribution of nucleon resonances with high spins.

論文

$$omega N$$ scattering length from $$omega$$ photoproduction on the proton near the reaction threshold

石川 貴嗣*; 藤村 寿子*; 深澤 宏司*; 橋本 亮*; He, Q.*; 本多 佑記*; 保坂 淳; 岩田 高広*; 甲斐田 俊*; 笠木 治郎太*; et al.

Physical Review C, 101(5), p.052201_1 - 052201_6, 2020/05

https://doi.org/10.1103/PhysRevC.101.052201
 被引用回数：9 パーセンタイル：53.37(Physics, Nuclear)

Photoproduction of the omega meson on the proton has been experimentally studied near the threshold. The total cross sections are determined at incident energies ranging from 1.09 to 1.15 GeV. The 1/2 and 3/2 spin-averaged scattering length $$a$$$$_{omega p}$$ and effective range $$r$$$$_{omega p}$$ between the CO meson and proton are estimated from the shape of the total cross section as a function of the incident photon energy: $$a$$$$_{omega p}$$ = (-0.97 $$_{rm -0.16stat-0.00syst}^{rm +0.16stat+0.03syst}$$ + $$i$$(0.07 $$_{rm -0.14stat-0.09syst}^{rm +0.15stat+0.17syst}$$) fm and $$r$$$$_{omega p}$$ = (+2.78 $$_{rm -0.54stat-0.12syst}^{rm +0.67stat+0.11syst}$$) + $$i$$(-0.01 $$_{rm -0.50stat-0.00syst}^{rm +0.46stat+0.06syst}$$) fm, resulting in a repulsive force. The real and imaginary parts for $$a$$$$_{omega p}$$ and $$r$$$$_{omega p}$$ are determined separately for the first time. A small $$P$$-wave contribution does not affect the obtained values.

論文

Beam-palarization asymmetries for the $$p$$($$overrightarrow{gamma}$$,$$K$$$$^{+}$$)$$Lambda$$ and $$p$$($$overrightarrow{gamma}$$,$$K$$$$^{+}$$)$$Sigma$$$$^{0}$$ reactions for $$E$$$$_{gamma}$$=1.5-2.4 GeV

Zegers, R. G. T.*; 住浜 水季*; Ahn, D. S.*; Ahn, J. K.*; 秋宗 秀俊*; 浅野 芳裕; Chang, W. C.*; Dat$'e$, S.*; 江尻 宏泰*; 藤村 寿子*; et al.

Physical Review Letters, 91(9), p.092001_1 - 092001_4, 2003/08

https://doi.org/10.1103/PhysRevLett.91.092001
 被引用回数：131 パーセンタイル：94.53(Physics, Multidisciplinary)

$$E$$$$_{gamma}$$=1.5-2.4GeVで$$p$$($$overrightarrow{gamma}$$,$$K$$$$^{+}$$)$$Lambda$$,$$p$$($$overrightarrow{gamma}$$,$$K$$$$^{+}$$)$$Sigma$$$$^{0}$$反応に対するビーム偏極非対称が初めて測定された。この結果は未決定のハドロン共鳴や反応機構解明に用いられる。

論文

Evidence for a narrow $$S$$ = +1 Baryon resonance in photoproduction from the neutron

中野 貴志*; Ahn, D. S.*; Ahn, J. K.*; 秋宗 秀俊*; 浅野 芳裕; Chang, W. C.*; 伊達 伸*; 江尻 宏泰*; 藤村 寿子*; 藤原 守; et al.

Physical Review Letters, 91(1), p.012002_1 - 012002_4, 2003/07

https://doi.org/10.1103/PhysRevLett.91.012002
 被引用回数：1041 パーセンタイル：99.84(Physics, Multidisciplinary)

$$K^{+}$$と$$K^{-}$$の両粒子を前方で測定することにより、$$^{12}$$Cを標的にした$$gamma$$n $$rightarrow$$ $$K^{+}$$$$K^{-}$$n光反応を研究した。1.54GeV/C$$^{2}$$に25MeV/C$$^{2}$$以下の幅の鋭いバリオン共鳴ピークを観測した。この共鳴ピークのストレンジネス($$S$$)は+1であった。この状態は5つのクォーク($$uudd bar{s}$$)が$$K^{+}$$と中性子に崩壊した状態であると解釈される。

5 件中 1件目～5件目を表示
  • 1