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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Príomhchruthaitheoirí: 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
Formáid: Journal article
Teanga:English
Foilsithe / Cruthaithe: 1997
_version_ 1826294390856876032
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
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language English
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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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