The University of Southampton
University of Southampton Institutional Repository

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
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
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), 1-40. (doi:10.1007/JHEP07(2016)068).

Record type: Article

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.

Text
__filestore.soton.ac.uk_users_skr1c15_mydocuments_eprints_Theory_Accomando_1602.05438v3.pdf - Accepted Manuscript
Download (1MB)
Text
art_10.1007_JHEP07(2016)068.pdf - Version of Record
Available under License Creative Commons Attribution.
Download (756kB)

More information

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

Catalogue record

Date deposited: 04 Oct 2016 09:04
Last modified: 09 Dec 2019 19:26

Export record

Altmetrics

Contributors

Author: Elena Accomando
Author: Daniele Barducci
Author: Stefania De Curtis
Author: Juri Fiaschi
Author: Stefano Moretti
Author: Claire H. Shepherd-Themistocleous

University divisions

Download statistics

Downloads from ePrints over the past year. Other digital versions may also be available to download e.g. from the publisher's website.

View more statistics

Atom RSS 1.0 RSS 2.0

Contact ePrints Soton: eprints@soton.ac.uk

ePrints Soton supports OAI 2.0 with a base URL of http://eprints.soton.ac.uk/cgi/oai2

This repository has been built using EPrints software, developed at the University of Southampton, but available to everyone to use.

We use cookies to ensure that we give you the best experience on our website. If you continue without changing your settings, we will assume that you are happy to receive cookies on the University of Southampton website.

×