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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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Lenguaje: | eng |
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2014
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Acceso en línea: | http://cds.cern.ch/record/1751429 |
_version_ | 1780943149004226560 |
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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. |
id | cern-1751429 |
institution | Organización Europea para la Investigación Nuclear |
language | eng |
publishDate | 2014 |
record_format | invenio |
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 |