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Angular correlations in γγ→ρ0ρ0 near threshold

Althoff, M, Braunschweig, W, Gather, K, Kirschfink, FJ, Lübelsmeyer, K, Martyn, HU, Peise, G, Rimkus, J, Sander, HG, Schmitz, D , Siebke, H, Trines, D, Wallraff, W, Boerner, H, Fischer, HM, Hartmann, H, Hilger, E, Hillen, W, Knop, G, Köpke, L, Kolanoski, H, Wedemeyer, R, Wermes, N, Wollstadt, M, Burkhardt, H, Cooper, S, Franzke, J, Hultschig, H, Joos, P, Koch, W, Kötz, U, Kowalski, H, Ladage, A, Löhr, B, Lüke, D, Mättig, P, Mess, KH, Notz, D, Pyrlik, J, Quarrie, DR, Riethmüller, R, Schütte, W, Söding, P, Wolf, G, Yekutieli, G, Dittmar, M, Fohrmann, R, Krasemann, HL, Leu, P, Lohrmann, E, Pandoulas, D, Poelz, G, Römer, O, Schmüser, P, Wiik, BH, Al-Agil, I, Beuselinck, R, Binnie, DM, Campbell, AJ, Dornan, PJ, Garbutt, DA, Jones, TD, Jones, WG, Lloyd, SL, McCardle, J, Sedgebeer, JK, Bell, KW, Bowler, MG, Brock, IC, Cashmore, RJ, Carnegie, R, Clarke, PEL, Devenish, R, Grossmann, P, Illingworth, J, Salmon, GL, Thomas, J, Wyatt, TR, Youngman, C, Foster, B, Hart, JC, Harvey, J, Proudfoot, J, Saxon, DH, Woodworth, PL, Heyland, D, Holder, M, Duchovni, E, Eisenberg, Y, Karshon, U, Mikenberg, G, Revel, D, Ronat, E, Shapira, A, Barklow, T, Meyer, T, Rudolph, G, Venkataramania, H, Wicklund, E and Wu, SL (1982) Angular correlations in γγ→ρ0ρ0 near threshold Zeitschrift für Physik C Particles and Fields, 16 (1). pp. 13-25.

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We present an analysis of ρ0ρ0 production by two photons in the ρ0ρ0 invariant mass range from 1.2 to 2.0 GeV. From a study of the angular correlations in the process γγ→ρ0ρ0→π- π+π- we exclude a dominant contribution from JP=0- or 2- states. The data indicate sizeable contributions from JP=0+ for four pion masses M4π<1.7 GeV and from JP=2+ for M4π>1.7 GeV. The data are also well described by a model with isotropic production and uncorrelated isotropic decay of the ρ0,s. The cross section stays high below the nominal ρ0ρ0 threshold, i.e. M4π<1.5 GeV. The matrix element for ρ0ρ0 production is found to decrease steeply with increasing M4π. Upper limits for the couplings of the ι(1440) and Θ(1640) to γγ and ρ0ρ0 are given:Γ(ι→γγ)·B(ι→ρ 0ρ0)<1.0 keV and Γ(Θ→γγ) © 1982 Springer-Verlag.

Item Type: Article
Authors :
Althoff, M
Braunschweig, W
Gather, K
Kirschfink, FJ
Lübelsmeyer, K
Martyn, HU
Peise, G
Rimkus, J
Sander, HG
Schmitz, D
Siebke, H
Trines, D
Wallraff, W
Boerner, H
Fischer, HM
Hartmann, H
Hilger, E
Hillen, W
Knop, G
Köpke, L
Kolanoski, H
Wedemeyer, R
Wermes, N
Wollstadt, M
Burkhardt, H
Cooper, S
Franzke, J
Hultschig, H
Joos, P
Koch, W
Kötz, U
Kowalski, H
Ladage, A
Löhr, B
Lüke, D
Mättig, P
Mess, KH
Notz, D
Pyrlik, J
Quarrie, DR
Riethmüller, R
Schütte, W
Söding, P
Wolf, G
Yekutieli, G
Dittmar, M
Fohrmann, R
Krasemann, HL
Leu, P
Lohrmann, E
Pandoulas, D
Poelz, G
Römer, O
Schmüser, P
Wiik, BH
Al-Agil, I
Beuselinck, R
Binnie, DM
Campbell, AJ
Dornan, PJ
Garbutt, DA
Jones, TD
Jones, WG
Lloyd, SL
McCardle, J
Sedgebeer, JK
Bell, KW
Bowler, MG
Brock, IC
Cashmore, RJ
Carnegie, R
Clarke, PEL
Devenish, R
Grossmann, P
Salmon, GL
Thomas, J
Wyatt, TR
Youngman, C
Foster, B
Hart, JC
Harvey, J
Proudfoot, J
Saxon, DH
Woodworth, PL
Heyland, D
Holder, M
Duchovni, E
Eisenberg, Y
Karshon, U
Mikenberg, G
Revel, D
Ronat, E
Shapira, A
Barklow, T
Meyer, T
Rudolph, G
Venkataramania, H
Wicklund, E
Wu, SL
Date : 1 March 1982
Identification Number : 10.1007/BF01573742
Depositing User : Symplectic Elements
Date Deposited : 17 May 2017 11:40
Last Modified : 17 May 2017 14:58

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