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Taming a leading theoretical uncertainty in HH measurements via accurate simulations for $ \textrm{b}\overline{\textrm{b}}\textrm{H} $ production

We present a new simulation for Higgs boson production in association with bottom quarks ($ b\overline{b}H $) at next-to-leading order (NLO) accuracy matched to parton showers in hadronic collisions. Both contributions, the standard one proportional to the bottom-quark Yukawa coupling and the loop-i...

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Autores principales: Manzoni, Stefano, Mazzeo, Elena, Mazzitelli, Javier, Wiesemann, Marius, Zaro, Marco
Lenguaje:eng
Publicado: 2023
Materias:
Acceso en línea:https://dx.doi.org/10.1007/JHEP09(2023)179
http://cds.cern.ch/record/2875151
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author Manzoni, Stefano
Mazzeo, Elena
Mazzitelli, Javier
Wiesemann, Marius
Zaro, Marco
author_facet Manzoni, Stefano
Mazzeo, Elena
Mazzitelli, Javier
Wiesemann, Marius
Zaro, Marco
author_sort Manzoni, Stefano
collection CERN
description We present a new simulation for Higgs boson production in association with bottom quarks ($ b\overline{b}H $) at next-to-leading order (NLO) accuracy matched to parton showers in hadronic collisions. Both contributions, the standard one proportional to the bottom-quark Yukawa coupling and the loop-induced one proportional to the top-quark Yukawa coupling from the gluon-fusion process, are taken into account in a scheme with massive bottom quarks. Therefore, we provide the full simulation of the $ b\overline{b}H $ final state in the Standard Model, which constitutes also a crucial background to measurements for Higgs-boson pair (HH) production at the Large Hadron Collider when at least one of the Higgs bosons decays to bottom quarks. So far, the modeling of the $ b\overline{b}H $ final state induced one of the dominant theoretical uncertainties to HH measurements, as the gluon-fusion component was described only at the leading order (LO) with uncertainties of $ \mathcal{O} $(100%). Including NLO corrections in its simulation allows us to reduce the scale dependence to $ \mathcal{O} $(50%) so that it becomes subdominant with respect to other systematic uncertainties. As a case study, we provide an in-depth analysis of the $ b\overline{b}H $ background to HH measurements with realistic selection cuts in the 2b2γ channel. We also compare our novel simulation with the currently-employed ones, discussing possible issues and shortcomings of a scheme with massless bottom quarks. Finally, we propagate the effect of the new $ b\overline{b}H $ simulation to HH searches in the 2b2γ and 2b2τ final states, and we find an improvement of up to 10% (20%) on the current (HL-LHC) limits on $ {\sigma}_{\textrm{SM}}^{HH} $.
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institution Organización Europea para la Investigación Nuclear
language eng
publishDate 2023
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spelling cern-28751512023-10-12T05:37:53Zdoi:10.1007/JHEP09(2023)179http://cds.cern.ch/record/2875151engManzoni, StefanoMazzeo, ElenaMazzitelli, JavierWiesemann, MariusZaro, MarcoTaming a leading theoretical uncertainty in HH measurements via accurate simulations for $ \textrm{b}\overline{\textrm{b}}\textrm{H} $ productionhep-exParticle Physics - Experimenthep-phParticle Physics - PhenomenologyWe present a new simulation for Higgs boson production in association with bottom quarks ($ b\overline{b}H $) at next-to-leading order (NLO) accuracy matched to parton showers in hadronic collisions. Both contributions, the standard one proportional to the bottom-quark Yukawa coupling and the loop-induced one proportional to the top-quark Yukawa coupling from the gluon-fusion process, are taken into account in a scheme with massive bottom quarks. Therefore, we provide the full simulation of the $ b\overline{b}H $ final state in the Standard Model, which constitutes also a crucial background to measurements for Higgs-boson pair (HH) production at the Large Hadron Collider when at least one of the Higgs bosons decays to bottom quarks. So far, the modeling of the $ b\overline{b}H $ final state induced one of the dominant theoretical uncertainties to HH measurements, as the gluon-fusion component was described only at the leading order (LO) with uncertainties of $ \mathcal{O} $(100%). Including NLO corrections in its simulation allows us to reduce the scale dependence to $ \mathcal{O} $(50%) so that it becomes subdominant with respect to other systematic uncertainties. As a case study, we provide an in-depth analysis of the $ b\overline{b}H $ background to HH measurements with realistic selection cuts in the 2b2γ channel. We also compare our novel simulation with the currently-employed ones, discussing possible issues and shortcomings of a scheme with massless bottom quarks. Finally, we propagate the effect of the new $ b\overline{b}H $ simulation to HH searches in the 2b2γ and 2b2τ final states, and we find an improvement of up to 10% (20%) on the current (HL-LHC) limits on $ {\sigma}_{\textrm{SM}}^{HH} $.We present a new simulation for Higgs boson production in association with bottom quarks ($b\bar{b}H$) at next-to-leading order (NLO) accuracy matched to parton showers in hadronic collisions. Both contributions, the standard one proportional to the bottom-quark Yukawa coupling and the loop-induced one proportional to the top-quark Yukawa coupling from the gluon-fusion process, are taken into account in a scheme with massive bottom quarks. Therefore, we provide the full simulation of the $b\bar{b}H$ final state in the Standard Model, which constitutes also a crucial background to measurements for Higgs-boson pair ($HH$) production at the Large Hadron Collider when at least one of the Higgs bosons decays to bottom quarks. So far, the modeling of the $b\bar{b}H$ final state induced one of the dominant theoretical uncertainties to $HH$ measurements, as the gluon-fusion component was described only at the leading order (LO) with uncertainties of $\mathcal{O}(100\%)$. Including NLO corrections in its simulation allows us to reduce the scale dependence to $\mathcal{O}(50\%)$ so that it becomes subdominant with respect to other systematic uncertainties. As a case study, we provide an in-depth analysis of the $b\bar{b}H$ background to $HH$ measurements with realistic selection cuts in the $2b2\gamma$ channel. We also compare our novel simulation with the currently-employed ones, discussing possible issues and shortcomings of a scheme with massless bottom quarks. Finally, we propagate the effect of the new $b\bar{b}H$ simulation to $HH$ searches in the $2b2\gamma$ and $2b2\tau$ final states, and we find an improvement of up to 10% (20%) on the current (HL-LHC) limits on the $HH$ cross section.arXiv:2307.09992MPP-2023-103PSI-PR-23-26TIF-UNIMI-2023-16oai:cds.cern.ch:28751512023-07-19
spellingShingle hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
Manzoni, Stefano
Mazzeo, Elena
Mazzitelli, Javier
Wiesemann, Marius
Zaro, Marco
Taming a leading theoretical uncertainty in HH measurements via accurate simulations for $ \textrm{b}\overline{\textrm{b}}\textrm{H} $ production
title Taming a leading theoretical uncertainty in HH measurements via accurate simulations for $ \textrm{b}\overline{\textrm{b}}\textrm{H} $ production
title_full Taming a leading theoretical uncertainty in HH measurements via accurate simulations for $ \textrm{b}\overline{\textrm{b}}\textrm{H} $ production
title_fullStr Taming a leading theoretical uncertainty in HH measurements via accurate simulations for $ \textrm{b}\overline{\textrm{b}}\textrm{H} $ production
title_full_unstemmed Taming a leading theoretical uncertainty in HH measurements via accurate simulations for $ \textrm{b}\overline{\textrm{b}}\textrm{H} $ production
title_short Taming a leading theoretical uncertainty in HH measurements via accurate simulations for $ \textrm{b}\overline{\textrm{b}}\textrm{H} $ production
title_sort taming a leading theoretical uncertainty in hh measurements via accurate simulations for $ \textrm{b}\overline{\textrm{b}}\textrm{h} $ production
topic hep-ex
Particle Physics - Experiment
hep-ph
Particle Physics - Phenomenology
url https://dx.doi.org/10.1007/JHEP09(2023)179
http://cds.cern.ch/record/2875151
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