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@article{Althoff:1982:10.1007/BF01573742,
author = {Althoff, M and Braunschweig, W and Gather, K and Kirschfink, FJ and Lübelsmeyer, K and Martyn, HU and Peise, G and Rimkus, J and Sander, HG and Schmitz, D and Siebke, H and Trines, D and Wallraff, W and Boerner, H and Fischer, HM and Hartmann, H and Hilger, E and Hillen, W and Knop, G and Köpke, L and Kolanoski, H and Wedemeyer, R and Wermes, N and Wollstadt, M and Burkhardt, H and Cooper, S and Franzke, J and Hultschig, H and Joos, P and Koch, W and Kötz, U and Kowalski, H and Ladage, A and Löhr, B and Lüke, D and Mättig, P and Mess, KH and Notz, D and Pyrlik, J and Quarrie, DR and Riethmüller, R and Schütte, W and Söding, P and Wolf, G and Yekutieli, G and Dittmar, M and Fohrmann, R and Krasemann, HL and Leu, P and Lohrmann, E and Pandoulas, D and Poelz, G and Römer, O and Schmüser, P and Wiik, BH and Al-Agil, I and Beuselinck, R and Binnie, DM and Campbell, AJ and Dornan, PJ and Garbutt, DA and Jones, TD and Jones, WG and Lloyd, SL and McCardle, J and Sedgebeer, JK and Bell, KW and },
doi = {10.1007/BF01573742},
journal = {Zeitschrift für Physik C Particles and Fields},
pages = {13--25},
title = {Angular correlations in γγ→ρ<sup>0</sup>ρ<sup>0</sup> near threshold},
url = {http://dx.doi.org/10.1007/BF01573742},
volume = {16},
year = {1982}
}

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TY  - JOUR
AB  - 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.
AU  - Althoff,M
AU  - Braunschweig,W
AU  - Gather,K
AU  - Kirschfink,FJ
AU  - Lübelsmeyer,K
AU  - Martyn,HU
AU  - Peise,G
AU  - Rimkus,J
AU  - Sander,HG
AU  - Schmitz,D
AU  - Siebke,H
AU  - Trines,D
AU  - Wallraff,W
AU  - Boerner,H
AU  - Fischer,HM
AU  - Hartmann,H
AU  - Hilger,E
AU  - Hillen,W
AU  - Knop,G
AU  - Köpke,L
AU  - Kolanoski,H
AU  - Wedemeyer,R
AU  - Wermes,N
AU  - Wollstadt,M
AU  - Burkhardt,H
AU  - Cooper,S
AU  - Franzke,J
AU  - Hultschig,H
AU  - Joos,P
AU  - Koch,W
AU  - Kötz,U
AU  - Kowalski,H
AU  - Ladage,A
AU  - Löhr,B
AU  - Lüke,D
AU  - Mättig,P
AU  - Mess,KH
AU  - Notz,D
AU  - Pyrlik,J
AU  - Quarrie,DR
AU  - Riethmüller,R
AU  - Schütte,W
AU  - Söding,P
AU  - Wolf,G
AU  - Yekutieli,G
AU  - Dittmar,M
AU  - Fohrmann,R
AU  - Krasemann,HL
AU  - Leu,P
AU  - Lohrmann,E
AU  - Pandoulas,D
AU  - Poelz,G
AU  - Römer,O
AU  - Schmüser,P
AU  - Wiik,BH
AU  - Al-Agil,I
AU  - Beuselinck,R
AU  - Binnie,DM
AU  - Campbell,AJ
AU  - Dornan,PJ
AU  - Garbutt,DA
AU  - Jones,TD
AU  - Jones,WG
AU  - Lloyd,SL
AU  - McCardle,J
AU  - Sedgebeer,JK
AU  - Bell,KW
AU  - Bowler,MG
AU  - Brock,IC
AU  - Cashmore,RJ
AU  - Carnegie,R
AU  - Clarke,PEL
AU  - Devenish,R
AU  - Grossmann,P
AU  - Illingworth,J
AU  - Salmon,GL
AU  - Thomas,J
AU  - Wyatt,TR
AU  - Youngman,C
AU  - Foster,B
AU  - Hart,JC
AU  - Harvey,J
AU  - Proudfoot,J
AU  - Saxon,DH
AU  - Woodworth,PL
AU  - Heyland,D
AU  - Holder,M
AU  - Duchovni,E
AU  - Eisenberg,Y
AU  - Karshon,U
AU  - Mikenberg,G
AU  - Revel,D
AU  - Ronat,E
AU  - Shapira,A
AU  - Barklow,T
AU  - Meyer,T
AU  - Rudolph,G
AU  - Venkataramania,H
AU  - Wicklund,E
AU  - Wu,SL
DO  - 10.1007/BF01573742
EP  - 25
PY  - 1982///
SN  - 0170-9739
SP  - 13
TI  - Angular correlations in γγ→ρ<sup>0</sup>ρ<sup>0</sup> near threshold
T2  - Zeitschrift für Physik C Particles and Fields
UR  - http://dx.doi.org/10.1007/BF01573742
VL  - 16
ER  -

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