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Measurement of the Higgs decay width in the diphoton channel

In this note, a projected measurement of the Higgs decay width ($\Gamma_{H}$) is presented, based on interference in the diphoton channel. Two different hypotheses were tested. Hypothesis A assumes that the $H\to\gamma\gamma$ cross-section is proportional to $\Gamma_{H}^{-1}$, whereas hypothesis B a...

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Autor principal: Adolfsson, Jonatan
Lenguaje:eng
Publicado: 2014
Materias:
Acceso en línea:http://cds.cern.ch/record/1751429
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author Adolfsson, Jonatan
author_facet Adolfsson, Jonatan
author_sort Adolfsson, Jonatan
collection CERN
description In this note, a projected measurement of the Higgs decay width ($\Gamma_{H}$) is presented, based on interference in the diphoton channel. Two different hypotheses were tested. Hypothesis A assumes that the $H\to\gamma\gamma$ cross-section is proportional to $\Gamma_{H}^{-1}$, whereas hypothesis B assumes that this cross-section is constant and instead uses the overall change in $m_{\gamma\gamma}$ line shape. Events were simulated using Sherpa 2.1, and were used to produce test statistics in order to obtain a 95 % confidence limit of $\Gamma_{H}$. The standard model width was tested using Asimov data sets, which were validated using pseudo-experiments for the integrated luminosities of Run 1, Run 2 and HL-LHC. The obtained limits are significantly improved with respect to previous studies, but further validations of the test are required. The expected limits for 300 fb$^{-1}$ are $1.19\times\Gamma_{H\,SM}$ for hypothesis A and $24\times\Gamma_{H\,SM}$ for hypothesis B.
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institution Organización Europea para la Investigación Nuclear
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spelling cern-17514292019-09-30T06:29:59Zhttp://cds.cern.ch/record/1751429engAdolfsson, JonatanMeasurement of the Higgs decay width in the diphoton channelParticle Physics - ExperimentIn this note, a projected measurement of the Higgs decay width ($\Gamma_{H}$) is presented, based on interference in the diphoton channel. Two different hypotheses were tested. Hypothesis A assumes that the $H\to\gamma\gamma$ cross-section is proportional to $\Gamma_{H}^{-1}$, whereas hypothesis B assumes that this cross-section is constant and instead uses the overall change in $m_{\gamma\gamma}$ line shape. Events were simulated using Sherpa 2.1, and were used to produce test statistics in order to obtain a 95 % confidence limit of $\Gamma_{H}$. The standard model width was tested using Asimov data sets, which were validated using pseudo-experiments for the integrated luminosities of Run 1, Run 2 and HL-LHC. The obtained limits are significantly improved with respect to previous studies, but further validations of the test are required. The expected limits for 300 fb$^{-1}$ are $1.19\times\Gamma_{H\,SM}$ for hypothesis A and $24\times\Gamma_{H\,SM}$ for hypothesis B.CERN-STUDENTS-Note-2014-100oai:cds.cern.ch:17514292014-08-22
spellingShingle Particle Physics - Experiment
Adolfsson, Jonatan
Measurement of the Higgs decay width in the diphoton channel
title Measurement of the Higgs decay width in the diphoton channel
title_full Measurement of the Higgs decay width in the diphoton channel
title_fullStr Measurement of the Higgs decay width in the diphoton channel
title_full_unstemmed Measurement of the Higgs decay width in the diphoton channel
title_short Measurement of the Higgs decay width in the diphoton channel
title_sort measurement of the higgs decay width in the diphoton channel
topic Particle Physics - Experiment
url http://cds.cern.ch/record/1751429
work_keys_str_mv AT adolfssonjonatan measurementofthehiggsdecaywidthinthediphotonchannel