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: Article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Published - 1990 9

ASJC Scopus subject areas

  • 物理学および天文学(その他)


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