Drell-Yan production of multi Z'-bosons at the LHC within Non-Universal ED and 4D Composite Higgs Models
Drell-Yan production of multi Z'-bosons at the LHC within Non-Universal ED and 4D Composite Higgs Models
The Drell-Yan di-lepton production at hadron colliders is by far the preferred channel to search for new heavy spin-1 particles. Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal, thereby neglecting the effect of the interference between the additional Z?-bosons and the Standard Model Z and ?. Recently, it has been established that both finite width and interference effects can be dealt with in experimental searches while still retaining the model independent approach ensured by the NWA. This assessment has been made for the case of popular single Z?-boson models currently probed at the CERN Large Hadron Collider (LHC). In this paper, we test the scope of the CERN machine in relation to the above issues for some benchmark multi Z?-boson models. In particular, we consider Non-Universal Extra Dimensional (NUED) scenarios and the 4-Dimensional Composite Higgs Model (4DCHM), both predicting a multi-Z? peaking structure. We conclude that in a variety of cases, specifically those in which the leptonic decays modes of one or more of the heavy neutral gauge bosons are suppressed and/or significant interference effects exist between these or with the background, especially present when their decay widths are significant, traditional search approaches based on the assumption of rather narrow and isolated objects might require suitable modifications to extract the underlying dynamics.
hep-ph
1-40
Accomando, Elena
8ebc75d7-bd92-4f70-a974-7bc15ebf088f
Barducci, Daniele
d0289bdd-ac34-493c-95cd-36d811070ecc
Curtis, Stefania De
7bf1f7cf-535f-4551-8d05-806c57cfa2d1
Fiaschi, Juri
a417f04d-05ec-4bff-bdee-ba20ac560fa7
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Shepherd-Themistocleous, Claire H.
02e9b880-a622-4ad1-9b20-db7ed25b2fa8
13 July 2016
Accomando, Elena
8ebc75d7-bd92-4f70-a974-7bc15ebf088f
Barducci, Daniele
d0289bdd-ac34-493c-95cd-36d811070ecc
Curtis, Stefania De
7bf1f7cf-535f-4551-8d05-806c57cfa2d1
Fiaschi, Juri
a417f04d-05ec-4bff-bdee-ba20ac560fa7
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
Shepherd-Themistocleous, Claire H.
02e9b880-a622-4ad1-9b20-db7ed25b2fa8
Accomando, Elena, Barducci, Daniele, Curtis, Stefania De, Fiaschi, Juri, Moretti, Stefano and Shepherd-Themistocleous, Claire H.
(2016)
Drell-Yan production of multi Z'-bosons at the LHC within Non-Universal ED and 4D Composite Higgs Models.
Journal of High Energy Physics, 2016 (68), .
(doi:10.1007/JHEP07(2016)068).
Abstract
The Drell-Yan di-lepton production at hadron colliders is by far the preferred channel to search for new heavy spin-1 particles. Traditionally, such searches have exploited the Narrow Width Approximation (NWA) for the signal, thereby neglecting the effect of the interference between the additional Z?-bosons and the Standard Model Z and ?. Recently, it has been established that both finite width and interference effects can be dealt with in experimental searches while still retaining the model independent approach ensured by the NWA. This assessment has been made for the case of popular single Z?-boson models currently probed at the CERN Large Hadron Collider (LHC). In this paper, we test the scope of the CERN machine in relation to the above issues for some benchmark multi Z?-boson models. In particular, we consider Non-Universal Extra Dimensional (NUED) scenarios and the 4-Dimensional Composite Higgs Model (4DCHM), both predicting a multi-Z? peaking structure. We conclude that in a variety of cases, specifically those in which the leptonic decays modes of one or more of the heavy neutral gauge bosons are suppressed and/or significant interference effects exist between these or with the background, especially present when their decay widths are significant, traditional search approaches based on the assumption of rather narrow and isolated objects might require suitable modifications to extract the underlying dynamics.
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art_10.1007_JHEP07(2016)068.pdf
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Accepted/In Press date: 7 July 2016
e-pub ahead of print date: 13 July 2016
Published date: 13 July 2016
Keywords:
hep-ph
Organisations:
Physics & Astronomy, Theory Group
Identifiers
Local EPrints ID: 401060
URI: http://eprints.soton.ac.uk/id/eprint/401060
PURE UUID: 32c85e0f-45a4-4438-a3b4-2e45f3da0d7e
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Date deposited: 04 Oct 2016 09:04
Last modified: 15 Mar 2024 03:17
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Contributors
Author:
Daniele Barducci
Author:
Stefania De Curtis
Author:
Juri Fiaschi
Author:
Claire H. Shepherd-Themistocleous
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