The reaction e+e- → γγ(γ) at Z0 energies
The total and differential cross-sections for the reaction e+e- → γγ(γ) are measured at centre of mass energies around 91 GeV using an integrated luminosity of 4.7 pb-1. The aggreement with QED prediction is good. Consequently there is no evidence for non-standard channels which would have the same...
| Hoofdauteurs: | , , , , , , , , , , , , , , , , , , , , , , , , |
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| Formaat: | Journal article |
| Taal: | English |
| Gepubliceerd in: |
1991
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| _version_ | 1826296212291059712 |
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| author | Abreu, P Adam, W Adami, F Adye, T Akesson, T Alekseev, G Allen, P Almehed, S Alted, F Alvsvaag, S Amaldi, U Anassontzis, E Antilogus, P Apel, W Apsimon, R Åsman, B Astier, P Augustin, J Augustinus, A Baillon, P Bambade, P Barao, F Barbiellini, G Bardin, D Baroncelli, A |
| author_facet | Abreu, P Adam, W Adami, F Adye, T Akesson, T Alekseev, G Allen, P Almehed, S Alted, F Alvsvaag, S Amaldi, U Anassontzis, E Antilogus, P Apel, W Apsimon, R Åsman, B Astier, P Augustin, J Augustinus, A Baillon, P Bambade, P Barao, F Barbiellini, G Bardin, D Baroncelli, A |
| author_sort | Abreu, P |
| collection | OXFORD |
| description | The total and differential cross-sections for the reaction e+e- → γγ(γ) are measured at centre of mass energies around 91 GeV using an integrated luminosity of 4.7 pb-1. The aggreement with QED prediction is good. Consequently there is no evidence for non-standard channels which would have the same experimental signature. The lower limits on the QED cuttoff parameters are Λ+ > 113 GeV and Λ- > 95 GeV. An upper limit on the effective coupling between a possible excited electron and the gamma is derived. At 95% confidence level the branching ratios for Z0 decay into π0γ, ηψ and γγγ are below 1.5 × 10-4, 2.8 × 10-4 and 1.4 × 10-4 respectively. © 1991. |
| first_indexed | 2024-03-07T04:12:51Z |
| format | Journal article |
| id | oxford-uuid:c86b926b-a7d0-4200-ad80-bfb20ce9cadb |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T04:12:51Z |
| publishDate | 1991 |
| record_format | dspace |
| spelling | oxford-uuid:c86b926b-a7d0-4200-ad80-bfb20ce9cadb2022-03-27T06:52:02ZThe reaction e+e- → γγ(γ) at Z0 energiesJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:c86b926b-a7d0-4200-ad80-bfb20ce9cadbEnglishSymplectic Elements at Oxford1991Abreu, PAdam, WAdami, FAdye, TAkesson, TAlekseev, GAllen, PAlmehed, SAlted, FAlvsvaag, SAmaldi, UAnassontzis, EAntilogus, PApel, WApsimon, RÅsman, BAstier, PAugustin, JAugustinus, ABaillon, PBambade, PBarao, FBarbiellini, GBardin, DBaroncelli, AThe total and differential cross-sections for the reaction e+e- → γγ(γ) are measured at centre of mass energies around 91 GeV using an integrated luminosity of 4.7 pb-1. The aggreement with QED prediction is good. Consequently there is no evidence for non-standard channels which would have the same experimental signature. The lower limits on the QED cuttoff parameters are Λ+ > 113 GeV and Λ- > 95 GeV. An upper limit on the effective coupling between a possible excited electron and the gamma is derived. At 95% confidence level the branching ratios for Z0 decay into π0γ, ηψ and γγγ are below 1.5 × 10-4, 2.8 × 10-4 and 1.4 × 10-4 respectively. © 1991. |
| spellingShingle | Abreu, P Adam, W Adami, F Adye, T Akesson, T Alekseev, G Allen, P Almehed, S Alted, F Alvsvaag, S Amaldi, U Anassontzis, E Antilogus, P Apel, W Apsimon, R Åsman, B Astier, P Augustin, J Augustinus, A Baillon, P Bambade, P Barao, F Barbiellini, G Bardin, D Baroncelli, A The reaction e+e- → γγ(γ) at Z0 energies |
| title | The reaction e+e- → γγ(γ) at Z0 energies |
| title_full | The reaction e+e- → γγ(γ) at Z0 energies |
| title_fullStr | The reaction e+e- → γγ(γ) at Z0 energies |
| title_full_unstemmed | The reaction e+e- → γγ(γ) at Z0 energies |
| title_short | The reaction e+e- → γγ(γ) at Z0 energies |
| title_sort | reaction e e γγ γ at z0 energies |
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