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Associated charged Higgs and W boson production in the MSSM at the CERN Large Hadron Collider
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
Uppsala University, Disciplinary Domain of Science and Technology, Physics, Department of Physics and Astronomy, High Energy Physics.
2008 (English)In: European Physical Journal C, ISSN 1434-6044, E-ISSN 1434-6052, Vol. 53, no 2, 267-280 p.Article in journal (Refereed) Published
Abstract [en]

We investigate the viability of observing charged Higgs bosons () produced in association with bosons at the CERN large hadron collider, using the leptonic decay and hadronic decay, within different scenarios of the minimal supersymmetric standard model (MSSM) with both real and complex parameters. Performing a parton level study we show how the irreducible standard model background from jets can be controlled by applying appropriate cuts and find that the size of a possible signal depends on the cuts needed to suppress QCD backgrounds and misidentifications. In the standard maximal mixing scenario of the MSSM we find a viable signal for large and intermediate masses () when using softer cuts (, 50 GeV), whereas for harder cuts (, 100 GeV) we only find a viable signal for very large (). We have also investigated a special class of MSSM scenarios with large mass splittings among the heavy Higgs bosons where the cross-section can be resonantly enhanced by factors up to one hundred, with a strong dependence on the -violating phases. Even so we find that the signal after cuts remains small except for small masses () when using the softer cuts. Finally, in all the scenarios we have investigated we have only found small -asymmetries.

Place, publisher, year, edition, pages
2008. Vol. 53, no 2, 267-280 p.
National Category
Physical Sciences
Identifiers
URN: urn:nbn:se:uu:diva-98098DOI: 10.1140/epjc/s10052-007-0453-xISI: 000252299200007OAI: oai:DiVA.org:uu-98098DiVA: diva2:173280
Available from: 2009-02-11 Created: 2009-02-11 Last updated: 2017-12-13Bibliographically approved
In thesis
1. Phenomenology of Charged Higgs Bosons and B-meson Decays
Open this publication in new window or tab >>Phenomenology of Charged Higgs Bosons and B-meson Decays
2009 (English)Doctoral thesis, comprehensive summary (Other academic)
Abstract [en]

For more than 30 years the Standard Model has been the theoretical foundation for particle physics. The theory has been verified successfully by experimental tests. Its biggest shortcoming is the non-discovery of the Higgs boson,responsible for giving the other particles masses. Despite its success there are hints that the Standard Model is not the complete theory and many extensions of it, such as supersymmetry, have been proposed.

Extended theories often predict the existence of a charged Higgs boson and its detection will be a clear sign of physics beyond the Standard Model. The main focus in this thesis is on various phenomenological aspects of the charged Higgs boson. For favorable mass and couplings direct detection is shown to be possible at the Large Hadron Collider in production with an associated W boson. It is also shown how a light charged Higgs can have measurable effects on spin correlations in decays of pair-produced top quarks. The charged Higgs boson can also be seen indirectly, in for example B-meson decays, which can be used to put constraints on its mass and fermion couplings. Exclusion limits in two supersymmetric models are given together with a comparison with the discovery potentials for the LHC experiments. A tool for calculating properties, such as masses and decays, of both charged and neutral Higgs bosons in the Two-Higgs-Doublet Model is also presented.

B-meson decays can also be used to test aspects of the strong interaction. Part of this thesis deals with improving and applying phenomenological models to B-meson decays. Although these models are not derived from first principles, their success shows that they capture important features of non-perturbative strong interactions.

Place, publisher, year, edition, pages
Uppsala: Acta Universitatis Upsaliensis, 2009. 40 p.
Series
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 606
Keyword
Supersymmetry, Beyond Standard Model, B-Physics, Charged Higgs Boson, LHC, QCD, Spin Correlations, CMSSM, NUHM
National Category
Subatomic Physics
Identifiers
urn:nbn:se:uu:diva-9564 (URN)978-91-554-7422-5 (ISBN)
Public defence
2009-03-20, Siegbahnsalen, Ånsgströmslaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (English)
Opponent
Supervisors
Available from: 2009-02-24 Created: 2009-02-11 Last updated: 2010-12-09Bibliographically approved

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