検索対象:     
報告書番号:
※ 半角英数字
 年 ~  年

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.

Access

:

- Accesses

InCites™

:

Altmetrics

:

[CLARIVATE ANALYTICS], [WEB OF SCIENCE], [HIGHLY CITED PAPER & CUP LOGO] and [HOT PAPER & FIRE LOGO] are trademarks of Clarivate Analytics, and/or its affiliated company or companies, and used herein by permission and/or license.