Please use this identifier to cite or link to this item: https://hdl.handle.net/11147/2842
Title: The Higgs boson and right-handed neutrinos in supersymmetric models
Other Titles: Süpersimetrik modellerde Higgs bozon ve sağ-el nötrinolar
Authors: Demir, Durmuş Ali
Özdal, Özer
Keywords: High energy physics
Higgs boson
Higgs field
Supersymmetric models
Minimal supersymmetric standard model
Issue Date: Jul-2016
Publisher: Izmir Institute of Technology
Source: Özdal, Ö. (2016). The higgs boson and right-handed neutrinos in supersymmetric models. Unpublished master's thesis, İzmir Institute of Technology, İzmir, Turkey
Abstract: The results represented in this thesis are based on our work in [1], where the predictions on the mass spectrum and Higgs boson decays are investigated in the supersymmetric standard model extended by U(1)B-L symmetry (BLSSM). The model requires two singlet Higgs fields, which are responsible for the radiative breaking of U(1)B-L symmetry. Radiative breaking of U(1)B-L symmetry yields right-handed neutrino of mass at the TeV scale. It predicts degenerate right-handed neutrino masses (1:7 2.2TeV) as well as the right-handed sneutrinos of mass . 4 TeV. The presence of right-handed neutrinos and sneutrinos trigger the baryon and lepton number violation processes, until they decouple from the Standard model particles. Besides, the model predicts rather heavy colored particles; m~t;m~b & 1:5 TeV, whilem~ & 100 GeV andm~ 1 & 600 GeV. Even though the implications on the SM-like Higgs boson are similar to minimal supersymmetric standard model (MSSM), BLSSM can predict another Higgs boson lighter than 150 GeV. We find that the second Higgs boson can be degenerate with the lightest CP-even Higgs boson of mass about 125 GeV and contribute to the Higgs decay into two photons. In addition, if it is not degenerate, it can provide a possible explanation for the excess in h ! 4l at the mass scale 145 GeV.
Bu tezde sunulan sonuçlar U(1)B-L simetrisi ile genişletilmiş süpersimetrik standart modelde (BLSSM) kütle spektrumu ve Higgs bozonunun bozunmalarını araştırdığımız çalışmamıza dayanmaktadır [1]. Bu model ışınımsal U(1)B-L simetrisini kırmaktan sorumlu iki adet tekil Higgs alanı içerir ve 1:7 ... 2:2 TeV enerji skalasında dejenere sağel nötrino kütleleri ile kütlesi 4 TeV’den küçük snötrino öngörür. Sağ-elli nötrino ve snötrinoların varlığı baryon ve lepton sayısının korunumunun ihlal edildiği süreçleri bu parçacıklar Standart Model parçacıklarına ayrışına dek tetikler. Ayrıca, model oldukça ağır renkli parçacıklar; m~ & 100 GeV and m~ 1 & 600 GeV iken m~t;m~b & 1:5 TeV, öngörür. Standart model benzeri Higgs bozon özellikleri minimal süpersimetrik standart modele çok benzese de, BLSSM 150 GeV’den hafif bir başka Higgs bozunu daha öngörür. Son olarak, bu ikinci Higgs bozonunun 125 GeV’deki en hafif CP-çift Higgs bozununa dejenere olacağı ve Higgs’in iki foton bozunum kanalına katkı sağladığı gösterilmiştir. Buna ek olarak, dejenere olmasa da yine aynı Higgs bozonu 145 GeV kütle skalasında h ! 4l bozunma kanalına olası bir açıklama getirmektedir.
Description: Thesis (Master)--Izmir Institute of Technology, Physics, Izmir, 2016
Includes bibliographical references (leaves: 52-56)
Text in English; Abstract: Turkish and English
x, 56 leaves
URI: http://hdl.handle.net/11147/2842
Appears in Collections:Master Degree / Yüksek Lisans Tezleri

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