First observation of $$gammagamma to pbar{p} K^+K^-$$ and search for exotic baryons in $$pK$$ systems
$$gammagamma to pbar{p} K^+K^-$$反応の初観測と$$pK$$系におけるエキゾチックバリオンの探索
Shen, C. P.*; 谷田 聖; Belle Collaboration*; 他177名*
Shen, C. P.*; Tanida, Kiyoshi; Belle Collaboration*; 177 of others*
The process $$gammagamma to pbar{p} K^+K^-$$ and its intermediate processes are measured for the first time using a 980 fb$$^{-1}$$ data sample collected with the Belle detector at the KEKB asymmetric-energy $$e^+e^-$$ collider. The production of $$pbar{p} K^+K^-$$ and a $$Lambda(1520)^0$$ ($$bar{Lambda}(1520)^0$$) signal in the $$pK^-$$ ($$bar{p}K^+$$) invariant mass spectrum are clearly observed. However, no evidence for an exotic baryon near 1540 MeV/$$c^2$$, denoted as $$Theta(1540)^0$$ ($$bar{Theta}(1540)^0$$) or$$Theta(1540)^{++}$$ ($$bar{Theta}(1540)^{--}$$), is seen in the $$pK^-$$ ($$bar{p}K^+$$) or $$pK^+$$ ($$bar{p}K^-$$) invariant mass spectra. Cross sections for $$gammagamma to pbar{p} K^+K^-$$, $$Lambda(1520)^0bar{p}K^+ + c.c.$$ and the products $$sigma(gammagamma to Theta(1540)^0 bar{p} K^+ + c.c.){cal B}(Theta(1540)^0 to pK^-)$$ and $$sigma(gammagamma to Theta(1540)^{++} bar{p} K^- + c.c.){cal B}(Theta(1540)^{++} to pK^+)$$ are measured. We also determine upper limits on the products of the $$chi_{c0}$$ and $$chi_{c2}$$ two-photon decay widths and their branching fractions to $$pbar{p} K^+K^-$$ at the 90% credibility level.
使用言語 : English
掲載資料名 : Physical Review D
: 93
: 11
ページ数 : p.112017_1 - 112017_9
発行年月 : 2016/06
出版社名 : American Physical Society
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受委託・共同研究相手機関 : 高エネルギー加速器研究機構
 
登録番号 : AA20160387
抄録集掲載番号 : 45000041
論文投稿番号 : 18377
Accesses  (From Jun. 2, 2014)
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パーセンタイル:62.92
分野:Astronomy & Astrophysics
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