High Statistics Measurement of the Cross Sections of γγ→π^+π^- Production(Physics of elementary particles and fields)
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概要
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We report on a high statistics measurement of the total and differential cross sections of the process γγ→π^+π^- in theπ^+π^- invariant mass range 0.8GeV/c^2<W<1.5GeV/c^2 with 85.9fb^<-1> of data collected at √<s>=10.58GeV and 10.52GeV with the Belle detector. A clear signal of the f_0(980) resonance is observed in addition to the f_2(1270) resonance. An improved 90% confidence level upper limit B(η'(958)→π^+π^-)<2.9×10^<-3> is obtained for P- and CP-violating decay of the η'(958) meson using the most conservative assumption about the interference with the background.
- 2007-07-15
著者
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渡辺 幸則
豊橋技術科学大学大学院
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Nakamura M.
Icrr Univ. Of Tokyo
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Ishigami T
Stefan Meyer Institut Fur Subatomare Physik
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TANAKA K.H.
理研
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Naruki M
Department Of Physics Kyoto University
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Itahashi T.
Department Of Physics Kyushu University
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Li J
Superalloy Division Institute Of Metal Research Chinese Academy Of Science
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Tanaka K.h.
Kek
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Shibuya H.
Icrr Univ. Of Tokyo
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