Background to Higgs-boson searches from internal conversions of off-shell photons associated with $Z/ \gamma ^{\ast}$ - boson production at the LHC
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dc.type
JournalArticle
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dc.description.physical
983-998
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dc.abstract.en
This paper presents the studies of the background contribution to the $H \rightarrow 4$/ searches originating from the processes of off-shell (virtual) photon emissions and their conversions into lepton pairs accompanying the production of $Z/ \gamma ^{\ast}$ - bosons at the LHC. They extend the analyses of the irreducible background presented in the ATLAS and CMS Higgs papers [Phys. Lett. B716, 1 (2012); Phys. Lett. B726, 88 (2013); Phys. Rev. D90, 052004 (2014); CERN-PH-EP-2014-170, to appear in Phys. Rev. D; Phys. Lett. B716, 30 (2012); Phys. Rev. D89, 92007 (2014)] by taking into account the emissions of off-shell photons by parton showers. Including these effects does not change significantly the Higgs-searches background level, provided that the transverse momentum of each of the final-state leptons is restricted to the range of $p_{T,l}$> 7 GeV. In the kinematical region extended towards lower lepton transverse momenta, the parton-shower contribution becomes important. A measurement method for pinning down the parton-shower effects has been proposed.
pl
dc.description.volume
46
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dc.description.number
5
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dc.description.publication
1
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dc.identifier.doi
10.5506/APhysPolB.46.983
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dc.identifier.eissn
1509-5770
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dc.title.journal
Acta Physica Polonica. B
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dc.language.container
eng
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dc.affiliation
Wydział Fizyki, Astronomii i Informatyki Stosowanej : Instytut Fizyki im. Mariana Smoluchowskiego
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dc.subtype
Article
pl
dc.rights.original
CC-BY; otwarte czasopismo; ostateczna wersja wydawcy; w momencie opublikowania; 0