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Charged Higgs boson in the W± Higgs channel at the Large Hadron Collider
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik. (Theoretical high energy physics)ORCID-id: 0000-0003-0452-0671
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik. (Theoretical high energy physics)
University of Southampton.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Högenergifysik. (Theoretical high energy physics)
Vise andre og tillknytning
2015 (engelsk)Inngår i: Nuclear Physics B, ISSN 0550-3213, E-ISSN 1873-1562, Vol. 893, s. 420-442Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

In light of the recent discovery of a neutral Higgs boson, Hobs, with a mass near 125 GeV, we reassess the LHC discovery potential of a charged Higgs boson, H±, in the W±Hobs decay channel. This decay channel can be particularly important for a H± heavier than the top quark, when it is produced through the pp→tH± process. The knowledge of the mass of Hobsprovides an additional handle in the kinematic selection when reconstructing a Breit-Wigner resonance in the Hobs→bb¯ decay channel. We consider some extensions of the Standard Model Higgs sector, with and without supersymmetry, and perform a dedicated signal-to-background analysis to test the scope of this channel for the LHC running at design energy (14 TeV), for 300/fb (standard) and 3000/fb (high) integrated luminosities. We find that, while this channel does not show much promise for a supersymmetric H± state, significant portions of the parameter spaces of several two-Higgs doublet models are testable.

sted, utgiver, år, opplag, sider
2015. Vol. 893, s. 420-442
Emneord [en]
Higgs boson, charged Higgs boson, LHC, supersymmetry
HSV kategori
Forskningsprogram
Fysik med inriktning mot elementarpartikelfysik
Identifikatorer
URN: urn:nbn:se:uu:diva-240312DOI: 10.1016/j.nuclphysb.2015.02.001ISI: 000352045000019OAI: oai:DiVA.org:uu-240312DiVA, id: diva2:776196
Forskningsfinansiär
Swedish Research Council, 2007-4071Swedish Research Council, 621-2011-5107Tilgjengelig fra: 2015-01-07 Laget: 2015-01-07 Sist oppdatert: 2017-12-05bibliografisk kontrollert
Inngår i avhandling
1. Phenomenology of Higgs Bosons Beyond the Standard Model
Åpne denne publikasjonen i ny fane eller vindu >>Phenomenology of Higgs Bosons Beyond the Standard Model
2015 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

After a long history of searches, a Higgs boson H was discovered by the ATLAS and the CMS experiments at the Large Hadron Collider (LHC) in 2012. Its properties fit well the ones predicted by the Standard Model (SM) of particle physics. However, the SM can not explain other established properties of Nature, such as the existence of Dark Matter. For this reason, models beyond the SM should be considered. Such models often predict the existence of several Higgs bosons and this thesis explores some of those models. In particular, the possibility to discover a charged Higgs boson, which would be a clear sign of physics beyond the SM, is studied.

A commonly studied extension of the SM is the framework of two-Higgs-doublet models (2HDMs), where there are five Higgs bosons. By confronting the parameter spaces of some 2HDMs with publically available data from the LHC, the prospects for finding the 2HDM Higgs bosons is presented through the calculation of production cross sections and decay branching ratios in various channels.

A new kind of 2HDM, called the Stealth Doublet Model is presented and the properties of the Higgs bosons are studied. In this model, it is shown that in particular the properties of the charged Higgs boson H± have new features not exhibited in earlier studied models. Within the parameter space compatible with the LHC results, the production cross section for H± can be sizeable enough to be experimentally observed.

Finally, the discovery prospects at the LHC, for a H± in the pptH± process, with the decays H±HW± and Hbb, is studied in various models beyond the Standard Model. It is shown that for the supersymmetric models, this channel is beyond the discovery reach of the LHC. In some of the other studied models, in particular the Aligned 2HDM, the situation is improved and the channel is feasible.

sted, utgiver, år, opplag, sider
Uppsala: Uppsala universitet, 2015. s. 59
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 1217
Emneord
Particle physics, The Standard Model, Higgs bosons, Higgs mechanism, Beyond the Standard Model, Two Higgs Doublet Models, Charged Higgs boson, Higgs decays, Supersymmetry, Renormalization, LHC, Collider constraints
HSV kategori
Forskningsprogram
Fysik med inriktning mot elementarpartikelfysik
Identifikatorer
urn:nbn:se:uu:diva-240617 (URN)978-91-554-9138-3 (ISBN)
Disputas
2015-02-27, Sal Å2001, Ångströmlaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2015-02-06 Laget: 2015-01-08 Sist oppdatert: 2015-03-09

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