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Single production of vectorlike quarks with large width at the Large Hadron Collider

Single production of vectorlike quarks with large width at the Large Hadron Collider
Single production of vectorlike quarks with large width at the Large Hadron Collider

Vectorlike quarks (VLQs) are predicted by several theoretical scenarios of new physics and having colour quantum numbers they can copiously be produced at the Large Hadron Collider (LHC) so long that their mass is within the testable kinematic regime of this machine. While it would be convenient to assume that such objects are narrow and can be treated in the so-called narrow width approximation (NWA), this is not always possible: non-minimal new physics scenarios can predict VLQs with potentially large couplings and/or exotic decays, which can contribute to generate a large decay width for such extra quarks without being constrained by current bounds. In this analysis we consider single production of VLQs, which is rapidly becoming a channel of choice in experimental searches owing to the ever increasing limits on their mass, and we describe an approach to treat the large width regime which retains to a large extent a degree of model independence. We also consider the role of potentially sizable and model-dependent interference effects between different VLQ production and decay channels as well as between these and the corresponding irreducible background.

2470-0010
Carvalho, Alexandra
5c76beb8-e532-41f9-8aad-8fbe22556a5d
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
O'Brien, Dermot
25b3b9ee-f780-4762-b049-72dbec38aed3
Panizzi, Luca
e8ade38e-ee5d-4e2d-8307-3286a8b92740
Prager, Hugo
49e874e6-4343-4cc7-a85c-d6e78b0a8ab0
Carvalho, Alexandra
5c76beb8-e532-41f9-8aad-8fbe22556a5d
Moretti, Stefano
b57cf0f0-4bc3-4e02-96e3-071255366614
O'Brien, Dermot
25b3b9ee-f780-4762-b049-72dbec38aed3
Panizzi, Luca
e8ade38e-ee5d-4e2d-8307-3286a8b92740
Prager, Hugo
49e874e6-4343-4cc7-a85c-d6e78b0a8ab0

Carvalho, Alexandra, Moretti, Stefano, O'Brien, Dermot, Panizzi, Luca and Prager, Hugo (2018) Single production of vectorlike quarks with large width at the Large Hadron Collider. Physical Review D, 98 (1), [015029]. (doi:10.1103/PhysRevD.98.015029).

Record type: Article

Abstract

Vectorlike quarks (VLQs) are predicted by several theoretical scenarios of new physics and having colour quantum numbers they can copiously be produced at the Large Hadron Collider (LHC) so long that their mass is within the testable kinematic regime of this machine. While it would be convenient to assume that such objects are narrow and can be treated in the so-called narrow width approximation (NWA), this is not always possible: non-minimal new physics scenarios can predict VLQs with potentially large couplings and/or exotic decays, which can contribute to generate a large decay width for such extra quarks without being constrained by current bounds. In this analysis we consider single production of VLQs, which is rapidly becoming a channel of choice in experimental searches owing to the ever increasing limits on their mass, and we describe an approach to treat the large width regime which retains to a large extent a degree of model independence. We also consider the role of potentially sizable and model-dependent interference effects between different VLQ production and decay channels as well as between these and the corresponding irreducible background.

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PhysRevD.98.015029 - Version of Record
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e-pub ahead of print date: 20 July 2018

Identifiers

Local EPrints ID: 424715
URI: http://eprints.soton.ac.uk/id/eprint/424715
ISSN: 2470-0010
PURE UUID: 402894ca-3059-4321-af64-77ac53f143e3

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Date deposited: 05 Oct 2018 11:41
Last modified: 06 Oct 2020 23:58

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Contributors

Author: Alexandra Carvalho
Author: Stefano Moretti
Author: Dermot O'Brien
Author: Luca Panizzi
Author: Hugo Prager

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