Angular correlations in γγ→ρ0ρ0 near threshold
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 f...
| Main Authors: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Format: | Journal article |
| Language: | English |
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Springer-Verlag
1982
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| _version_ | 1797062397519724544 |
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| author | Althoff, M Braunschweig, W Gather, K Kirschfink, F Lübelsmeyer, K Martyn, H Peise, G Rimkus, J Sander, H Schmitz, D Siebke, H Trines, D Wallraff, W Boerner, H Fischer, H Hartmann, H Hilger, E Hillen, W Knop, G Köpke, L Kolanoski, H Wedemeyer, R Wermes, N Wollstadt, M Burkhardt, H |
| author_facet | Althoff, M Braunschweig, W Gather, K Kirschfink, F Lübelsmeyer, K Martyn, H Peise, G Rimkus, J Sander, H Schmitz, D Siebke, H Trines, D Wallraff, W Boerner, H Fischer, H Hartmann, H Hilger, E Hillen, W Knop, G Köpke, L Kolanoski, H Wedemeyer, R Wermes, N Wollstadt, M Burkhardt, H |
| author_sort | Althoff, M |
| collection | OXFORD |
| description | 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. |
| first_indexed | 2024-03-06T20:44:58Z |
| format | Journal article |
| id | oxford-uuid:35914e03-d9da-4b60-9339-ca897030e507 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-06T20:44:58Z |
| publishDate | 1982 |
| publisher | Springer-Verlag |
| record_format | dspace |
| spelling | oxford-uuid:35914e03-d9da-4b60-9339-ca897030e5072022-03-26T13:32:49ZAngular correlations in γγ→ρ0ρ0 near thresholdJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:35914e03-d9da-4b60-9339-ca897030e507EnglishSymplectic Elements at OxfordSpringer-Verlag1982Althoff, MBraunschweig, WGather, KKirschfink, FLübelsmeyer, KMartyn, HPeise, GRimkus, JSander, HSchmitz, DSiebke, HTrines, DWallraff, WBoerner, HFischer, HHartmann, HHilger, EHillen, WKnop, GKöpke, LKolanoski, HWedemeyer, RWermes, NWollstadt, MBurkhardt, HWe 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. |
| spellingShingle | Althoff, M Braunschweig, W Gather, K Kirschfink, F Lübelsmeyer, K Martyn, H Peise, G Rimkus, J Sander, H Schmitz, D Siebke, H Trines, D Wallraff, W Boerner, H Fischer, H Hartmann, H Hilger, E Hillen, W Knop, G Köpke, L Kolanoski, H Wedemeyer, R Wermes, N Wollstadt, M Burkhardt, H Angular correlations in γγ→ρ0ρ0 near threshold |
| title | Angular correlations in γγ→ρ0ρ0 near threshold |
| title_full | Angular correlations in γγ→ρ0ρ0 near threshold |
| title_fullStr | Angular correlations in γγ→ρ0ρ0 near threshold |
| title_full_unstemmed | Angular correlations in γγ→ρ0ρ0 near threshold |
| title_short | Angular correlations in γγ→ρ0ρ0 near threshold |
| title_sort | angular correlations in γγ ρ0ρ0 near threshold |
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