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Model-independent approach for incorporating interference effects in collider searches for new resonances

The presence of large-mass resonances in the data collected at the Large Hadron Collider would provide direct evidence of physics beyond the Standard Model. A key challenge in current resonance searches at the LHC is the modelling of signal–background interference effects, which can severely distort...

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Detalles Bibliográficos
Autores principales: Frixione, Stefano, Roos, Lydia, Ting, Edmund, Vryonidou, Eleni, White, Martin, Williams, Anthony G.
Lenguaje:eng
Publicado: 2020
Materias:
Acceso en línea:https://dx.doi.org/10.1140/epjc/s10052-020-08763-5
http://cds.cern.ch/record/2729613
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author Frixione, Stefano
Roos, Lydia
Ting, Edmund
Vryonidou, Eleni
White, Martin
Williams, Anthony G.
author_facet Frixione, Stefano
Roos, Lydia
Ting, Edmund
Vryonidou, Eleni
White, Martin
Williams, Anthony G.
author_sort Frixione, Stefano
collection CERN
description The presence of large-mass resonances in the data collected at the Large Hadron Collider would provide direct evidence of physics beyond the Standard Model. A key challenge in current resonance searches at the LHC is the modelling of signal–background interference effects, which can severely distort the shape of the reconstructed invariant mass distribution relative to the case where there is no interference. Such effects are strongly dependent on the beyond the Standard Model theory that must be considered as unknown if one aims to minimise any theoretical bias on the search results. In this paper, we describe a procedure which employs a physically-motivated, model-independent template functional form that can be used to model interference effects, both for the characterisation of positive discoveries, and in the presentation of null results. We illustrate the approach with the example of a scalar resonance decaying into a pair of photons.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2020
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spelling cern-27296132021-11-13T10:57:20Zdoi:10.1140/epjc/s10052-020-08763-5http://cds.cern.ch/record/2729613engFrixione, StefanoRoos, LydiaTing, EdmundVryonidou, EleniWhite, MartinWilliams, Anthony G.Model-independent approach for incorporating interference effects in collider searches for new resonanceshep-phParticle Physics - PhenomenologyThe presence of large-mass resonances in the data collected at the Large Hadron Collider would provide direct evidence of physics beyond the Standard Model. A key challenge in current resonance searches at the LHC is the modelling of signal–background interference effects, which can severely distort the shape of the reconstructed invariant mass distribution relative to the case where there is no interference. Such effects are strongly dependent on the beyond the Standard Model theory that must be considered as unknown if one aims to minimise any theoretical bias on the search results. In this paper, we describe a procedure which employs a physically-motivated, model-independent template functional form that can be used to model interference effects, both for the characterisation of positive discoveries, and in the presentation of null results. We illustrate the approach with the example of a scalar resonance decaying into a pair of photons.The presence of large-mass resonances in the data collected at the Large Hadron Collider would provide direct evidence of physics beyond the Standard Model. A key challenge in current resonance searches at the LHC is the modelling of signal--background interference effects, which can severely distort the shape of the reconstructed invariant mass distribution relative to the case where there is no interference. Such effects are strongly dependent on the beyond the Standard Model theory that must be considered as unknown if one aims to minimise any theoretical bias on the search results. In this paper, we describe a procedure which employs a physically-motivated, model-independent template functional form that can be used to model interference effects, both for the characterisation of positive discoveries, and in the presentation of null results. We illustrate the approach with the example of a scalar resonance decaying into a pair of photons.arXiv:2008.07751ADP-20-17/T1127; CERN-TH-2020-124oai:cds.cern.ch:27296132020-08-18
spellingShingle hep-ph
Particle Physics - Phenomenology
Frixione, Stefano
Roos, Lydia
Ting, Edmund
Vryonidou, Eleni
White, Martin
Williams, Anthony G.
Model-independent approach for incorporating interference effects in collider searches for new resonances
title Model-independent approach for incorporating interference effects in collider searches for new resonances
title_full Model-independent approach for incorporating interference effects in collider searches for new resonances
title_fullStr Model-independent approach for incorporating interference effects in collider searches for new resonances
title_full_unstemmed Model-independent approach for incorporating interference effects in collider searches for new resonances
title_short Model-independent approach for incorporating interference effects in collider searches for new resonances
title_sort model-independent approach for incorporating interference effects in collider searches for new resonances
topic hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1140/epjc/s10052-020-08763-5
http://cds.cern.ch/record/2729613
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