Can we discover double Higgs production at the LHC?

Show simple item record Alves, Alexandre [UNIFESP] Ghosh, Tathagata Sinha, Kuver 2019-08-19T11:49:41Z 2019-08-19T11:49:41Z 2017
dc.identifier.citation Physical Review D. College Pk, v. 96, n. 3, p. -, 2017.
dc.identifier.issn 2470-0010
dc.description.abstract We explore double Higgs production via gluon fusion in the b (b) over bar gamma gamma channel at the high-luminosity LHC using machine learning tools. We first propose a Bayesian optimization approach to select cuts on kinematic variables, obtaining a 30%-50% increase in the significance compared to current results in the literature. We show that this improvement persists once systematic uncertainties are taken into account. We next use boosted decision trees (BDT) to further discriminate signal and background events. Our analysis shows that a joint optimization of kinematic cuts and BDT hyperparameters results in an appreciable improvement in the significance. Finally, we perform a multivariate analysis of the output scores of the BDT. We find that assuming a very low level of systematics, the techniques proposed here will be able to confirm the production of a pair of standard model Higgs bosons at 5 sigma level with 3 ab(-1) of data. Assuming a more realistic projection of the level of systematics, around 10%, the optimization of cuts to train BDTs combined with a multivariate analysis delivers a respectable significance of 4.6 sigma. Even assuming large systematics of 20%, our analysis predicts a 3.6 sigma significance, which represents at least strong evidence in favor of double Higgs production. We carefully incorporate background contributions coming from light flavor jets or c jets being misidentified as b jets and jets being misidentified as photons in our analysis. en
dc.description.sponsorship Fundação de Amparo a Pesquisa de Estado de São Paulo (FAPESP)
dc.description.sponsorship Conselho Nacional de Desenvolvimento Científico e Tecnológico, CNPq
dc.description.sponsorship U.S. Department of Energy
dc.format.extent -
dc.language.iso eng
dc.publisher Amer Physical Soc
dc.rights Acesso restrito
dc.title Can we discover double Higgs production at the LHC? en
dc.type Artigo
dc.description.affiliation Univ Fed São Paulo, Dept Fis, BR-09972270 São Paulo, Brazil
dc.description.affiliation Oklahoma State Univ, Dept Phys, Stillwater, OK 74078 USA
dc.description.affiliation Oklahoma State Univ, Oklahoma Ctr High Energy Phys, Stillwater, OK 74078 USA
dc.description.affiliation Univ Oklahoma, Dept Phys & Astron, Norman, OK 73019 USA
dc.description.affiliation Univ Utah, Dept Phys & Astron, Salt Lake City, UT 84112 USA
dc.description.affiliationUnifesp Univ Fed São Paulo, Dept Fis, BR-09972270 São Paulo, Brazil
dc.description.sponsorshipID FAPESP: 2013/22079-8
dc.description.sponsorshipID CNPq: 307098/2014-1
dc.description.sponsorshipID U.S. Department of Energy: de-sc 0016013
dc.identifier.doi 10.1103/PhysRevD.96.035022
dc.description.source Web of Science
dc.identifier.wos WOS:000408348300004


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