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New angles on top quark decay to a charged Higgs
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärn- och partikelfysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärn- och partikelfysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärn- och partikelfysik.
Uppsala universitet, Teknisk-naturvetenskapliga vetenskapsområdet, Fysiska sektionen, Institutionen för fysik och astronomi, Kärn- och partikelfysik.
2009 (engelsk)Inngår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 01, nr 1, s. 024-Artikkel i tidsskrift (Fagfellevurdert) Published
Abstract [en]

To properly discover a charged Higgs Boson (H±) requires its spin and couplings to be determined. We investigate how to utilize t spin correlations to analyze the H± couplings in the decay tbH+bτ+ντ. Within the framework of a general Two-Higgs-Doublet Model, we obtain results on the spin analyzing coefficients for this decay and study in detail its spin phenomenology, focusing on the limits of large and small values for tan β. Using a Monte Carlo approach to simulate full hadron-level events, we evaluate systematically how the H± → τ±ντ decay mode can be used for spin analysis. The most promising observables are obtained from azimuthal angle correlations in the transverse rest frames of t(). This method is particularly useful for determining the coupling structure of H± in the large tan β limit, where differences from the SM are most significant.

sted, utgiver, år, opplag, sider
2009. Vol. 01, nr 1, s. 024-
Emneord [en]
Beyond Standard Model, Higgs Physics, Spin and Polarization Effects, Hadronic Colliders
HSV kategori
Identifikatorer
URN: urn:nbn:se:uu:diva-98100DOI: 10.1088/1126-6708/2008/01/024ISI: 000252983400053OAI: oai:DiVA.org:uu-98100DiVA, id: diva2:173282
Tilgjengelig fra: 2009-02-11 Laget: 2009-02-11 Sist oppdatert: 2017-12-13bibliografisk kontrollert
Inngår i avhandling
1. Phenomenology of Charged Higgs Bosons and B-meson Decays
Åpne denne publikasjonen i ny fane eller vindu >>Phenomenology of Charged Higgs Bosons and B-meson Decays
2009 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
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.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2009. s. 40
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 606
Emneord
Supersymmetry, Beyond Standard Model, B-Physics, Charged Higgs Boson, LHC, QCD, Spin Correlations, CMSSM, NUHM
HSV kategori
Identifikatorer
urn:nbn:se:uu:diva-9564 (URN)978-91-554-7422-5 (ISBN)
Disputas
2009-03-20, Siegbahnsalen, Ånsgströmslaboratoriet, Lägerhyddsvägen 1, Uppsala, 13:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2009-02-24 Laget: 2009-02-11 Sist oppdatert: 2010-12-09bibliografisk kontrollert
2. Physics at the High-Energy Frontier: Phenomenological Studies of Charged Higgs Bosons and Cosmic Neutrino Detection
Åpne denne publikasjonen i ny fane eller vindu >>Physics at the High-Energy Frontier: Phenomenological Studies of Charged Higgs Bosons and Cosmic Neutrino Detection
2009 (engelsk)Doktoravhandling, med artikler (Annet vitenskapelig)
Abstract [en]

The Standard Model of particle physics successfully describes present collider data. Nevertheless, theoretical and cosmological results call for its extension. A softly broken supersymmetric completion around the TeV scale solves several of the outstanding issues. Supersymmetry requires two Higgs doublets, leading to five physical Higgs states. These include a pair of charged Higgs bosons H±, which are a generic feature of theories with multiple Higgs doublets. Using results from high-energy colliders and flavour physics, constraints are derived on the charged Higgs boson mass and couplings; both for constrained scenarios in the minimal supersymmetric standard model (MSSM) with grand unification, and for general two-Higgs-doublet models. The MSSM results are compared to the projected reach for charged Higgs searches at the Large Hadron Collider (LHC). At the LHC, a light charged Higgs is accessible through top quark decay. Beyond a discovery, it is demonstrated how angular distributions sensitive to top quark spin correlations can be used to determine the structure of the H±tb coupling. The public code 2HDMC, which performs calculations in a general, CP-conserving, two-Higgs-doublet model, is introduced.

In parallel to the developments at colliders, the most energetic particles ever recorded are the ultra-high-energy (UHE) cosmic rays. To gain more insight into their origin, new experiments are searching for UHE neutrinos. These searches require detectors of vast volume, which can be achieved by searching for coherent radio pulses arising from the Askaryan effect. The prospects of using a satellite orbiting the Moon to search for neutrino interactions are investigated, and a similar study for an Earth-based radio telescope is presented. In both cases, the method is found competitive for detection of the very highest energy neutrinos considered.

sted, utgiver, år, opplag, sider
Uppsala: Acta Universitatis Upsaliensis, 2009. s. 71
Serie
Digital Comprehensive Summaries of Uppsala Dissertations from the Faculty of Science and Technology, ISSN 1651-6214 ; 699
Emneord
particle physics, Standard Model, beyond the Standard Model, supersymmetry, Higgs physics, charged Higgs boson, LHC, flavour physics, ultra-high-energy neutrinos, Askaryan effect, radio detection, lunar satellites
HSV kategori
Forskningsprogram
högenergifysik
Identifikatorer
urn:nbn:se:uu:diva-111162 (URN)978-91-554-7682-3 (ISBN)
Disputas
2010-01-29, Häggsalen, Ångströmlaboratoriet, Uppsala, 13:15 (engelsk)
Opponent
Veileder
Tilgjengelig fra: 2010-01-07 Laget: 2009-12-04 Sist oppdatert: 2010-01-07bibliografisk kontrollert

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