検索対象:     
報告書番号:
※ 半角英数字
 年 ~ 
 年
検索結果: 2 件中 1件目~2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 ...

使用言語

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

Production cross sections of hyperons and charmed baryons from $$e^+e^-$$ annihilation near $$sqrt{s} = 10.52$$ GeV

新山 雅之*; 谷田 聖; Belle Collaboration*; 他167名*

Physical Review D, 97(7), p.072005_1 - 072005_21, 2018/04

AA2018-0515.pdf:1.37MB

 被引用回数:18 パーセンタイル:69.77(Astronomy & Astrophysics)

We measure the inclusive production cross sections of hyperons and charmed baryons from $$e^+e^-$$ annihilation using a 800 fb$$^{-1}$$ data sample taken near the $$Upsilon(4S)$$ resonance with the Belle detector at the KEKB asymmetric-energy $$e^+ e^-$$ collider. The feed-down contributions from heavy particles are subtracted using our data, and the direct production cross sections are presented for the first time. The production cross sections divided by the number of spin states for $$S=-1$$ hyperons follow an exponential function with a single slope parameter except for the $$Sigma(1385)^+$$ resonance. Suppression for $$Sigma(1385)^+$$ and $$Xi(1530)^0$$ hyperons is observed. Among the production cross sections of charmed baryons, a factor of three difference for $$Lambda_c^+$$ states over $$Sigma_c$$ states is observed. This observation suggests a diquark structure for these baryons.

論文

Observation of an alternative $$chi_{c0}(2P)$$ candidate in $$e^+e^- to J/psi Dbar{D}$$

Chilikin, K.*; 谷田 聖; Belle Collaboration*; 他167名*

Physical Review D, 95(11), p.112003_1 - 112003_17, 2017/06

AA2017-0237.pdf:0.72MB

 被引用回数:45 パーセンタイル:89.9(Astronomy & Astrophysics)

We perform a full amplitude analysis of the process $$e^+e^- to J/psi Dbar{D}$$, where $$D$$ refers to either $$D^+$$ or $$D^0$$. A new charmonium-like state $$X^*(3860)$$ that decays to $$Dbar{D}$$ is observed with a significance of $$6.5sigma$$. Its mass is $$(3862^{+26}_{-32}{}^{+40}_{-13})$$ MeV/$$c^2$$ and width is $$(201^{+154}_{-67}{}^{+88}_{-82})$$ MeV. The $$J^{PC}=0^{++}$$ hypothesis is favored over the $$2^{++}$$ hypothesis at the level of $$2.5sigma$$. The analysis is based on the 980 fb$$^{-1}$$ data sample collected by the Belle detector at the asymmetric-energy $$e^+e^-$$ collider KEKB.

2 件中 1件目~2件目を表示
  • 1