Search for charged Higgs bosons in the H± → tb decay channel in pp collisions at √s=8 TeV using the ATLAS detector

Mullier, Geoffrey; Haug, Sigve; Weber, Michael; Meloni, Federico; Cervelli, Alberto; Beck, Hans Peter; Stucci, Stefania; Ereditato, Antonio (2016). Search for charged Higgs bosons in the H± → tb decay channel in pp collisions at √s=8 TeV using the ATLAS detector. Journal of High Energy Physics, 2016(3) Springer 10.1007/JHEP03(2016)127

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Charged Higgs bosons heavier than the top quark and decaying via H ± →tb are searched for in proton--proton collisions measured with the ATLAS experiment at √s=8 TeV corresponding to an integrated luminosity of 20.3 fb⁻¹. The production of a charged Higgs boson in association with a top quark, gb→tH ±, is explored in the mass range 200 to 600 GeV using multi-jet final states with one electron or muon. In order to separate the signal from the Standard Model background, analysis techniques combining several kinematic variables are employed. An excess of events above the background-only hypothesis is observed across a wide mass range, amounting to up to 2.4 standard deviations. Upper limits are set on the gb→tH ± production cross section times the branching fraction BR(H ± →tb) . Additionally, the complementary s-channel production, qq ′ →H±, is investigated through a reinterpretation of W ′ →tb searches in ATLAS. Final states with one electron or muon are relevant for H ± masses from 0.4 to 2.0 TeV, whereas the all-hadronic final state covers the range 1.5 to 3.0 TeV. In these search channels, no significant excesses from the predictions of the Standard Model are observed, and upper limits are placed on the qq ′ →H ± production cross section times the branching fraction BR(H ± →tb) .

Item Type:

Journal Article (Original Article)

Division/Institute:

08 Faculty of Science > Physics Institute > Laboratory for High Energy Physics (LHEP)

UniBE Contributor:

Haug, Sigve; Weber, Michael and Beck, Hans Peter

Subjects:

500 Science > 530 Physics
500 Science > 510 Mathematics

ISSN:

1029-8479

Publisher:

Springer

Language:

English

Submitter:

Annette Krebs-Wegenast

Date Deposited:

14 Aug 2017 14:31

Last Modified:

20 Aug 2017 02:17

Publisher DOI:

10.1007/JHEP03(2016)127

Additional Information:

Kollaboration - Es sind nur die Berner Autoren namentlich erwähnt.

BORIS DOI:

10.7892/boris.99996

URI:

https://boris.unibe.ch/id/eprint/99996

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