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. Hagemann; D. 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

doi:10.1007/BF01565857

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

Research output: Contribution to journal › Article › peer-review

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Abstract

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, Γ_λλ(a₀(980))=0.28±0.04±0.10 KeV/BR(a₀(980)→π⁰η) and Γ_λλ(a₂(1320))=1.01±0.14±0.22KeV. For the f₀(975) and f₄(2050) upper limits of the widths were obtained, Γ_λλ(f₀(975))<0.6 KeV, and Γ_λλ(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.

Original language	English
Pages (from-to)	343-351
Number of pages	9
Journal	Zeitschrift für Physik C Particles and Fields
Volume	47
Issue number	3
DOIs	https://doi.org/10.1007/BF01565857
Publication status	Published - Sept 1990
Externally published	Yes

All Science Journal Classification (ASJC) codes

Physics and Astronomy (miscellaneous)

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10.1007/BF01565857

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Oest, T., Olsson, J., Allison, J., Ambrus, K., Barlow, R. J., Bartel, W., Bethke, S., Bowdery, C. K., Cartwright, S. L., Chrin, J., Clarke, D., Dieckmann, A., Duerdoth, I. P., Eckerlin, G., Elsen, E., Felst, R., Finch, A. J., Foster, F., Greenshaw, T., ... Zorn, G. T. (1990). Measurement of resonance production in the reactions γγ →π⁰π⁰ and γγ →π⁰η. Zeitschrift für Physik C Particles and Fields, 47(3), 343-351. https://doi.org/10.1007/BF01565857

Oest, T, Olsson, J, Allison, J, Ambrus, K, Barlow, RJ, Bartel, W, Bethke, S, Bowdery, CK, Cartwright, SL, Chrin, J, Clarke, D, Dieckmann, A, Duerdoth, IP, Eckerlin, G, Elsen, E, Felst, R, Finch, AJ, Foster, F, Greenshaw, T, Hagemann, J, Haidt, D, Heintze, J, Heinzelmann, G, Hellenbrand, KH, Hill, P, Hughes, G, Kado, H, Kawagoe, K, Kleinwort, C, Knies, G, Komamiya, S, Krehbiel, H, v. Krogh, J, Kuhlen, M, Loebinger, FK, Macbeth, AA, Magnussen, N, Marshall, R, Meinke, R, Middleton, RP, Murphy, PG, Naroska, B, Nye, JM, Ould-Saada, F, Pitzl, D, Ramcke, R, Rieseberg, H, Sato, A, Schmidt, D, Smolik, L, Schneekloth, U, Skard, JAJ, Spitzer, J, Steffen, P, Stephens, K, Takeshita, T, Wagner, A, Walker, IW, Weber, G, Zimmer, M & Zorn, GT 1990, 'Measurement of resonance production in the reactions γγ →π⁰π⁰ and γγ →π⁰η', Zeitschrift für Physik C Particles and Fields, vol. 47, no. 3, pp. 343-351. https://doi.org/10.1007/BF01565857

@article{2af456086d1d49f68de7760d14491f69,

title = "Measurement of resonance production in the reactions γγ →π0π0 and γγ →π0η",

abstract = "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.",

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

year = "1990",

month = sep,

doi = "10.1007/BF01565857",

language = "English",

volume = "47",

pages = "343--351",

journal = "Zeitschrift f{\"u}r Physik C Particles and Fields",

issn = "0170-9739",

publisher = "Springer New York",

number = "3",

}

TY - JOUR

T1 - Measurement of resonance production in the reactions γγ →π0π0 and γγ →π0η

AU - Oest, T.

AU - Olsson, J.

AU - Allison, J.

AU - Ambrus, K.

AU - Barlow, R. J.

AU - Bartel, W.

AU - Bethke, S.

AU - Bowdery, C. K.

AU - Cartwright, S. L.

AU - Chrin, J.

AU - Clarke, D.

AU - Dieckmann, A.

AU - Duerdoth, I. P.

AU - Eckerlin, G.

AU - Elsen, E.

AU - Felst, R.

AU - Finch, A. J.

AU - Foster, F.

AU - Greenshaw, T.

AU - Hagemann, J.

AU - Haidt, D.

AU - Heintze, J.

AU - Heinzelmann, G.

AU - Hellenbrand, K. H.

AU - Hill, P.

AU - Hughes, G.

AU - Kado, H.

AU - Kawagoe, K.

AU - Kleinwort, C.

AU - Knies, G.

AU - Komamiya, S.

AU - Krehbiel, H.

AU - v. Krogh, J.

AU - Kuhlen, M.

AU - Loebinger, F. K.

AU - Macbeth, A. A.

AU - Magnussen, N.

AU - Marshall, R.

AU - Meinke, R.

AU - Middleton, R. P.

AU - Murphy, P. G.

AU - Naroska, B.

AU - Nye, J. M.

AU - Ould-Saada, F.

AU - Pitzl, D.

AU - Ramcke, R.

AU - Rieseberg, H.

AU - Sato, A.

AU - Schmidt, D.

AU - Smolik, L.

AU - Schneekloth, U.

AU - Skard, J. A.J.

AU - Spitzer, J.

AU - Steffen, P.

AU - Stephens, K.

AU - Takeshita, T.

AU - Wagner, A.

AU - Walker, I. W.

AU - Weber, G.

AU - Zimmer, M.

AU - Zorn, G. T.

PY - 1990/9

Y1 - 1990/9

N2 - 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.

AB - 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.

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U2 - 10.1007/BF01565857

DO - 10.1007/BF01565857

M3 - Article

AN - SCOPUS:34249952803

SN - 0170-9739

VL - 47

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EP - 351

JO - Zeitschrift für Physik C Particles and Fields

JF - Zeitschrift für Physik C Particles and Fields

IS - 3

ER -

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

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