Measurement of the triple gluon vertex from double quark tagged 4-jet events
The 4-jet events collected by the DELPHI experiment at LEP1 in 1992, 1993 and 1994 are analysed to determine the contribution of the triple-gluon vertex. Two of the four jets are tagged as jets from b-or c-quarks using lifetime and lepton transverse momentum information. The 4-jet contributions from...
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| Aineistotyyppi: | Journal article |
| Kieli: | English |
| Julkaistu: |
1997
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| _version_ | 1826294390856876032 |
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| author | Abreu, P Adam, W Adye, T Adzic, P Alekseev, G Allport, P Almehed, S Amaldi, U Amato, S Andersson, P Andreazza, A Antilogus, P Apel, W Arnoud, Y Asman, B Augustin, J Augustinus, A Baillon, P Bambade, P Barao, F Barbi, M Barbiellini, G Bardin, D Barker, G Baroncelli, A |
| author_facet | Abreu, P Adam, W Adye, T Adzic, P Alekseev, G Allport, P Almehed, S Amaldi, U Amato, S Andersson, P Andreazza, A Antilogus, P Apel, W Arnoud, Y Asman, B Augustin, J Augustinus, A Baillon, P Bambade, P Barao, F Barbi, M Barbiellini, G Bardin, D Barker, G Baroncelli, A |
| author_sort | Abreu, P |
| collection | OXFORD |
| description | The 4-jet events collected by the DELPHI experiment at LEP1 in 1992, 1993 and 1994 are analysed to determine the contribution of the triple-gluon vertex. Two of the four jets are tagged as jets from b-or c-quarks using lifetime and lepton transverse momentum information. The 4-jet contributions from double-gluon brems Strahlung, the triple-gluon vertex, and secondary quark-antiquark pair production then yield significantly different two-dimensional distributions in the generalized Nachtmann Reiter angle versus the opening angle of the two secondary jets. These distributions are used to fit CA/CF, the ratio of the coupling strength of the triple-gluon vertex to that of gluon bremsstrahlung, and NC/NA, the ratio of the number of quark colours to the number of gluons, giving CA/CF = 2.51 ± 0.28 and NC/NA = 0.38 ∓ 0.10 in agreement with the values expected from QCD: CA/CF= 9/4 = 2.25 and NC/NA = 3/8 = 0.375. © 1997 Published by Elsevier Science B.V. |
| first_indexed | 2024-03-07T03:44:54Z |
| format | Journal article |
| id | oxford-uuid:bf226a4f-dacf-46f6-a0d7-fc856e579c49 |
| institution | University of Oxford |
| language | English |
| last_indexed | 2024-03-07T03:44:54Z |
| publishDate | 1997 |
| record_format | dspace |
| spelling | oxford-uuid:bf226a4f-dacf-46f6-a0d7-fc856e579c492022-03-27T05:45:09ZMeasurement of the triple gluon vertex from double quark tagged 4-jet eventsJournal articlehttp://purl.org/coar/resource_type/c_dcae04bcuuid:bf226a4f-dacf-46f6-a0d7-fc856e579c49EnglishSymplectic Elements at Oxford1997Abreu, PAdam, WAdye, TAdzic, PAlekseev, GAllport, PAlmehed, SAmaldi, UAmato, SAndersson, PAndreazza, AAntilogus, PApel, WArnoud, YAsman, BAugustin, JAugustinus, ABaillon, PBambade, PBarao, FBarbi, MBarbiellini, GBardin, DBarker, GBaroncelli, AThe 4-jet events collected by the DELPHI experiment at LEP1 in 1992, 1993 and 1994 are analysed to determine the contribution of the triple-gluon vertex. Two of the four jets are tagged as jets from b-or c-quarks using lifetime and lepton transverse momentum information. The 4-jet contributions from double-gluon brems Strahlung, the triple-gluon vertex, and secondary quark-antiquark pair production then yield significantly different two-dimensional distributions in the generalized Nachtmann Reiter angle versus the opening angle of the two secondary jets. These distributions are used to fit CA/CF, the ratio of the coupling strength of the triple-gluon vertex to that of gluon bremsstrahlung, and NC/NA, the ratio of the number of quark colours to the number of gluons, giving CA/CF = 2.51 ± 0.28 and NC/NA = 0.38 ∓ 0.10 in agreement with the values expected from QCD: CA/CF= 9/4 = 2.25 and NC/NA = 3/8 = 0.375. © 1997 Published by Elsevier Science B.V. |
| spellingShingle | Abreu, P Adam, W Adye, T Adzic, P Alekseev, G Allport, P Almehed, S Amaldi, U Amato, S Andersson, P Andreazza, A Antilogus, P Apel, W Arnoud, Y Asman, B Augustin, J Augustinus, A Baillon, P Bambade, P Barao, F Barbi, M Barbiellini, G Bardin, D Barker, G Baroncelli, A Measurement of the triple gluon vertex from double quark tagged 4-jet events |
| title | Measurement of the triple gluon vertex from double quark tagged 4-jet events |
| title_full | Measurement of the triple gluon vertex from double quark tagged 4-jet events |
| title_fullStr | Measurement of the triple gluon vertex from double quark tagged 4-jet events |
| title_full_unstemmed | Measurement of the triple gluon vertex from double quark tagged 4-jet events |
| title_short | Measurement of the triple gluon vertex from double quark tagged 4-jet events |
| title_sort | measurement of the triple gluon vertex from double quark tagged 4 jet events |
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