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Searches for hyperbolic extra dimensions at the LHC
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik, Teoretisk partikelfysik. (Theoretical Particle Physics)
KTH, Skolan för teknikvetenskap (SCI), Teoretisk fysik, Teoretisk partikelfysik.ORCID-id: 0000-0002-3525-8349
2008 (Engelska)Ingår i: Journal of High Energy Physics (JHEP), ISSN 1126-6708, E-ISSN 1029-8479, Vol. 2008, nr 08, s. 077-Artikel i tidskrift (Refereegranskat) Published
Abstract [en]

We investigate a model of large extra dimensions where the internal space has the geometry of a hyperbolic disc. Compared with the ADD model, this model provides a more satisfactory solution to the hierarchy problem between the electroweak scale and the Planck scale, and it also avoids constraints from astrophysics. In general, a novel feature of this model is that the physical results depend on the position of the brane in the internal space, and in particular, the signal almost disappears completely if the brane is positioned at the center of the disc. Since there is no known analytic form of the Kaluza-Klein spectrum for our choice of geometry, we obtain a spectrum based on a combination of approximations and numerical computations. We study the possible signatures of our model for hadron colliders, especially the LHC, where the most important processes are the production of a graviton together with a hadronic jet or a photon. We find that the signals are similar to those of the ADD model, regarding both qualitative behavior and strength. For the case of hadronic jet production, it is possible to obtain relatively strong signals, while for the case of photon production, this is much more difficult.

Ort, förlag, år, upplaga, sidor
IOP Publishing , 2008. Vol. 2008, nr 08, s. 077-
Nyckelord [en]
large extra dimensions, hadronic colliders, space dimensions, millimeter, hierarchy, gravity, signals
Nationell ämneskategori
Subatomär fysik
Identifikatorer
URN: urn:nbn:se:kth:diva-17796DOI: 10.1088/1126-6708/2008/08/077ISI: 000258917400032Scopus ID: 2-s2.0-54749115150OAI: oai:DiVA.org:kth-17796DiVA, id: diva2:335841
Forskningsfinansiär
Vetenskapsrådet, 621-2005-3588
Anmärkning
QC 20100525Tillgänglig från: 2011-06-21 Skapad: 2010-08-05 Senast uppdaterad: 2017-12-12Bibliografiskt granskad
Ingår i avhandling
1. Astrophysical and Collider Signatures of Extra Dimensions
Öppna denna publikation i ny flik eller fönster >>Astrophysical and Collider Signatures of Extra Dimensions
2010 (Engelska)Licentiatavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

In recent years, there has been a large interest in the subject of extra dimensions in particle physics. In particular, a number of models have been suggested which provide solutions to some of the problems with the current Standard Model of particle physics, and which could be tested in the next generation of high-energy experiments. Among the most important of these models are the large extra dimensions model by Arkani-Hamed, Dimopoulos, and Dvali, the universal extra dimensions model, and models allowing right-handed neutrinos to propagate in the extra dimensions. In this thesis, we study phenomenological aspects of these three models, or simple modifications of them.

 

The Arkani-Hamed-Dimopoulos-Dvali model attempts to solve the gauge hierarchy problem through a volume suppression of Newton's gravitational constant, lowering the fundamental Planck scale down to the electroweak scale. However, this solution is unsatisfactory in the sense that it introduces a new scale through the radius of the extra dimensions, which is unnaturally large compared to the electroweak scale. It has been suggested that a similar model, with a hyperbolic internal space, could provide a more satisfactory solution to the problem, and we consider the hadron collider phenomenology of such a model.

 

One of the main features of the universal extra dimensions model is the existence of a potential dark matter candidate, the lightest Kaluza-Klein particle. In the so-called minimal universal extra dimensions model, the identity of this particle is well defined, but in more general models, it could change. We consider the indirect neutrino detection signals for a number of different such dark matter candidates, in a five- as well as a six-dimensional model.

 

Finally, right-handed neutrinos propagating in extra dimensions could provide an alternative scenario to the seesaw mechanism for generating small masses for the left-handed neutrinos. Since extra-dimensional models are non-renormalizable, the Kaluza-Klein tower is expected to be cut off at some high-energy scale. We study a model where a Majorana neutrino at this cutoff scale is responsible for the generation of the light neutrino masses, while the lower modes of the tower could possibly be observed in the Large Hadron Collider. We investigate the bounds on the model from non-unitarity effects, as well as collider signatures of the model.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2010. s. 68
Serie
Trita-FYS, ISSN 0280-316X ; 2010:05
Nyckelord
Extra-dimensional quantum field theories, universal extra dimensions, Kaluza-Klein dark matter, Arkani-Hamed-Dimopoulos-Dvali model, hierarchy problem, neutrino mass, seesaw mechanism, Large Hadron Collider phenomenology
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:kth:diva-11968 (URN)978-91-7415-556-3 (ISBN)
Presentation
2010-02-19, FB53, Albanova, Roslagstullsbacken 21, 106 91 Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20110324Tillgänglig från: 2010-02-05 Skapad: 2010-02-02 Senast uppdaterad: 2011-03-24Bibliografiskt granskad
2. Particle Phenomenology of Compact Extra Dimensions
Öppna denna publikation i ny flik eller fönster >>Particle Phenomenology of Compact Extra Dimensions
2012 (Engelska)Doktorsavhandling, sammanläggning (Övrigt vetenskapligt)
Abstract [en]

This thesis is an investigation of the subject of extra dimensions in particle physics. In recent years, there has been a large interest in this subject. In particular, a number of models have been suggested that provide solutions to some of the problem with the current Standard Model of particle physics. These models typically give rise to experimental signatures around the TeV energy scale, which means that they could be tested in the next generation of high-energy experiments, such as the LHC. Among the most important of these models are the universal extra dimensions model, the large extra dimensions model by Arkani-Hamed, Dimopolous, and Dvali, and models where right-handed neutrinos propagate in the extra dimensions.

In the thesis, we study phenomenological aspects of these models, or simple modifications of them. In particular, we focus on Kaluza–Klein dark matter in universal extra dimensions models, different aspects of neutrino physics in higher dimensions, and collider phenomenology of extra dimensions. In addition, we consider consequences of the enhanced renormalization group running of physical parameters in higher-dimensional models.

Ort, förlag, år, upplaga, sidor
Stockholm: KTH Royal Institute of Technology, 2012. s. xiv, 98
Serie
Trita-FYS, ISSN 0280-316X ; 2012:16
Nyckelord
Higher-dimensional quantum field theories, universal extra dimensions, Arkani-Hamed–Dimopolous–Dvali (ADD) model, hierarchy problem, Kaluza– Klein dark matter, neutrino mass, seesaw mechanism, leptonic mixing, renormalization group running, collider phenomenology, Large Hadron Collider
Nationell ämneskategori
Subatomär fysik
Identifikatorer
urn:nbn:se:kth:diva-93749 (URN)978-91-7501-305-3 (ISBN)
Disputation
2012-05-11, Sal FB53, Albanova, Roslagstullsbacken 21, Stockholm, 10:00 (Engelska)
Opponent
Handledare
Anmärkning
QC 20120427Tillgänglig från: 2012-04-27 Skapad: 2012-04-25 Senast uppdaterad: 2012-04-27Bibliografiskt granskad

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