Measurement of resonance production in the reactions γγ →π0π0 and γγ →π0η

T. Oest, J. Olsson, J. Allison, K. Ambrus, R. J. Barlow, W. Bartel, S. Bethke, C. K. Bowdery, S. L. Cartwright, J. Chrin, D. Clarke, A. Dieckmann, I. P. Duerdoth, G. Eckerlin, E. Elsen, R. Felst, A. J. Finch, F. Foster, T. Greenshaw, J. HagemannD. Haidt, J. Heintze, G. Heinzelmann, K. H. Hellenbrand, P. Hill, G. Hughes, H. Kado, K. Kawagoe, C. Kleinwort, G. Knies, S. Komamiya, H. Krehbiel, J. v. Krogh, M. Kuhlen, F. K. Loebinger, A. A. Macbeth, N. Magnussen, R. Marshall, R. Meinke, R. P. Middleton, P. G. Murphy, B. Naroska, J. M. Nye, F. Ould-Saada, D. Pitzl, R. Ramcke, H. Rieseberg, A. Sato, D. Schmidt, L. Smolik, U. Schneekloth, J. A.J. Skard, J. Spitzer, P. Steffen, K. Stephens, T. Takeshita, A. Wagner, I. W. Walker, G. Weber, M. Zimmer, G. T. Zorn

研究成果: Contribution to journalArticle査読

66 被引用数 (Scopus)


Resonance production in the γγ reactions e+e-→e+e+e-π0π0 and e+e-π0η has been studied with the JADE detector at PETRA. The decay widths into γγ of the f2(1270), a0(980) and a2(1320) were measured to be {Mathematical expression} Kev, Γλλ(a0(980))=0.28±0.04±0.10 KeV/BR(a0(980)→π0η) and Γλλ(a2(1320))=1.01±0.14±0.22KeV. For the f0(975) and f4(2050) upper limits of the widths were obtained, Γλλ(f0(975))<0.6 KeV, and Γλλ(f4(2050))<1.1 KeV, both at the 95% C.L. Assuming that the spin 0 background under the f2(1270) is small, the f2(1270) was found to be produced exclusively in a helicity 2 state. The helicity 0 contribution is <15% at the 95% C.L. The cross section for λλ→π0π0 in the mass range 2.0-3.5 GeV/c2 was measured for the first time. Since the cross section for λλ→π+π- is a factor ∼2 larger, ππ production in this range can be interpreted as taking place via isospin 0 production.

ジャーナルZeitschrift für Physik C Particles and Fields
出版ステータス出版済み - 9 1 1990

All Science Journal Classification (ASJC) codes

  • 物理学および天文学(その他)


「Measurement of resonance production in the reactions γγ →π<sup>0</sup>π<sup>0</sup> and γγ →π<sup>0</sup>η」の研究トピックを掘り下げます。これらがまとまってユニークなフィンガープリントを構成します。