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Theories on the origin of mass and d...

Harvard University.

Theories on the origin of mass and dark matter.

紀錄類型:	書目-電子資源 : Monograph/item
正題名/作者:	Theories on the origin of mass and dark matter.
作者:	Walker, Devin George Edward.
面頁冊數:	93 p.
附註:	Adviser: Nima Arkani-Hamed.
附註:	Source: Dissertation Abstracts International, Volume: 67-05, Section: B, page: 2627.
Contained By:	Dissertation Abstracts International67-05B.
標題:	Physics, Elementary Particles and High Energy.
電子資源:	http://pqdd.sinica.edu.tw/twdaoapp/servlet/advanced?query=3217922
ISBN:	9780542694387

Theories on the origin of mass and dark matter.
Walker, Devin George Edward.

Theories on the origin of mass and dark matter. - 93 p.

Adviser: Nima Arkani-Hamed.

Thesis (Ph.D.)--Harvard University, 2006.

The second theory presents a new framework for electroweak symmetry breaking which interpolates between the two standard paradigms and mitigates the faults of each. The paradigms, a weakly coupled scalar condensate and a strongly coupled fermion condensate, respectively suffer from fine-tuning concerns and potential discrepancies with precision electroweak tests. The Higgs is a pseudo Nambu Goldstone boson, potentially composite. The one-loop top quark contribution to the effective potential is canceled by contributions from additional vector-like quarks, and the cutoff can naturally be higher than in the minimal Standard Model. Unlike Little Higgs models, the cutoff sensitivity from one loop gauge contributions is not canceled. However, such contributions are naturally small as long as the cutoff is below 6 TeV. Precision electroweak corrections are suppressed relative to those of Technicolor or generic Little Higgs theories. In some versions of the intermediate scenario, the Higgs mass is computable in terms of the masses of these additional fermions and the Nambu-Goldstone boson decay constant. In addition to the Higgs, new scalar and pseudoscalar particles are typically present at the weak scale.

ISBN: 9780542694387Subjects--Topical Terms:

227490
Physics, Elementary Particles and High Energy.

Theories on the origin of mass and dark matter.
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520 # $a The second theory presents a new framework for electroweak symmetry breaking which interpolates between the two standard paradigms and mitigates the faults of each. The paradigms, a weakly coupled scalar condensate and a strongly coupled fermion condensate, respectively suffer from fine-tuning concerns and potential discrepancies with precision electroweak tests. The Higgs is a pseudo Nambu Goldstone boson, potentially composite. The one-loop top quark contribution to the effective potential is canceled by contributions from additional vector-like quarks, and the cutoff can naturally be higher than in the minimal Standard Model. Unlike Little Higgs models, the cutoff sensitivity from one loop gauge contributions is not canceled. However, such contributions are naturally small as long as the cutoff is below 6 TeV. Precision electroweak corrections are suppressed relative to those of Technicolor or generic Little Higgs theories. In some versions of the intermediate scenario, the Higgs mass is computable in terms of the masses of these additional fermions and the Nambu-Goldstone boson decay constant. In addition to the Higgs, new scalar and pseudoscalar particles are typically present at the weak scale.
520 # $a This thesis details two theories which provide an explanation for the origin of mass and dark matter at energy scales beyond the Standard Model. The first theory describes a natural, ultraviolet completion featuring a composite Little Higgs. Below a TeV, the effective theory contains the minimal Standard Model, the Higgs and an additional extra neutral scalar. The Higgs is realized as a pseudo Nambu-Goldstone boson which, at the TeV scale, is coupled to additional scalars, gauge bosons and vector-like charged 2/3 quarks in a manner that minimizes the ultraviolet sensitivity of the Higgs' potential. In addition, its mass is stabilized due to a softly broken shift symmetry. Many of the additional particles are odd under an exact "dark matter parity," (-1)(2S+3 B+L ). The lightest parity odd particle is most likely a neutral fermion and may make a good dark matter candidate. Above 10 TeV, the theory is strongly coupled, softly broken superconformal theory.
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