Header

UZH-Logo

Maintenance Infos

Search for $t\overline tH$ production in the all-jet final state in proton-proton collisions at $\sqrt s$ = 13 TeV


Abstract

A search is presented for the associated production of a Higgs boson with a top quark pair in the all-jet final state. Events containing seven or more jets are selected from a sample of proton-proton collisions at $\sqrt s =13 TeV$ collected with the CMS detector at the LHC in 2016, corresponding to an integrated luminosity of $35.9 fb ^{−1}$. To separate the $t\overline tH$ signal from the irreducible $t\overline t + b\overline b$ background, the analysis assigns leading order matrix element signal and background probability densities to each event. A likelihood-ratio statistic based on these probability densities is used to extract the signal. The results are provided in terms of an observed $ttH$ signal strength relative to the standard model production cross section $μ = σ/_{σSM}$, assuming a Higgs boson mass of 125 GeV. The best fit value is $ \hat{\mu }=0.9±0.7(stat)±1.3(syst)=0.9±1.5(tot)$, and the observed and expected upper limits are, respectively, $μ < 3.8 and < 3.1 at 95%$ confidence levels.

Abstract

A search is presented for the associated production of a Higgs boson with a top quark pair in the all-jet final state. Events containing seven or more jets are selected from a sample of proton-proton collisions at $\sqrt s =13 TeV$ collected with the CMS detector at the LHC in 2016, corresponding to an integrated luminosity of $35.9 fb ^{−1}$. To separate the $t\overline tH$ signal from the irreducible $t\overline t + b\overline b$ background, the analysis assigns leading order matrix element signal and background probability densities to each event. A likelihood-ratio statistic based on these probability densities is used to extract the signal. The results are provided in terms of an observed $ttH$ signal strength relative to the standard model production cross section $μ = σ/_{σSM}$, assuming a Higgs boson mass of 125 GeV. The best fit value is $ \hat{\mu }=0.9±0.7(stat)±1.3(syst)=0.9±1.5(tot)$, and the observed and expected upper limits are, respectively, $μ < 3.8 and < 3.1 at 95%$ confidence levels.

Statistics

Citations

Dimensions.ai Metrics
5 citations in Web of Science®
3 citations in Scopus®
Google Scholar™

Altmetrics

Downloads

4 downloads since deposited on 22 Feb 2019
4 downloads since 12 months
Detailed statistics

Additional indexing

Item Type:Journal Article, refereed, original work
Communities & Collections:07 Faculty of Science > Physics Institute
Dewey Decimal Classification:530 Physics
Language:English
Date:2018
Deposited On:22 Feb 2019 10:53
Last Modified:26 Sep 2019 10:20
Publisher:Springer
ISSN:1029-8479
OA Status:Gold
Free access at:Publisher DOI. An embargo period may apply.
Publisher DOI:https://doi.org/10.1007/JHEP06(2018)101

Download

Download PDF  'Search for $t\overline tH$ production in the all-jet final state in proton-proton collisions at $\sqrt s$ = 13 TeV'.
Preview
Content: Published Version
Filetype: PDF
Size: 1MB
View at publisher
Licence: Creative Commons: Attribution 4.0 International (CC BY 4.0)