Scopus İndeksli Yayınlar Koleksiyonu / Scopus Indexed Publications Collection
Permanent URI for this collectionhttps://hdl.handle.net/11147/7148
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Article Citation - WoS: 21Citation - Scopus: 20Mass Spectrum and Higgs Profile in B - L Symmetric Ssm(American Physical Society, 2016) Ün, Cem Salih; Özdal, ÖzerWe investigate the predictions on the mass spectrum and Higgs boson decays 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. It predicts degenerate right-handed neutrino masses (1.7-2.2 TeV) as well as the right-handed sneutrinos of mass less than or similar to 4 TeV. The presence of right-handed neutrinos and sneutrinos triggers 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) over bar), m((h) over bar) greater than or similar to 1.5 TeV, while m((tau) over tilde) greater than or similar to 100 GeV and m((chi) over tilde1 +/-) greater than or similar to 600 GeV. Even though the implications are similar to the minimal supersymmetric standard model, BLSSM can predict another Higgs boson lighter than 150 GeV. We find that the second Higgs boson can be degenerate with the lightest charge parity (CP)-even Higgs boson of mass about 125 GeV and contribute to the Higgs decay into two photons. In addition, it can provide an explanation for the excess in h -> 4l at the mass scale similar to 145 GeV.Article Citation - WoS: 3Citation - Scopus: 3Reconsidering extra time-like dimensions(Springer Verlag, 2006) Erdem, Recai; Ün, Cem SalihIn this study we reconsider the phenomenological problems related to tachyonic modes in the context of extra time-like dimensions. First we reconsider a lower bound on the size of extra time-like dimensions and improve on the conclusion in the literature. Next we discuss the issues of spontaneous decay of stable fermions through tachyonic decays and disappearance of fermions due to tachyonic contributions to their self-energies. We find that the tachyonic modes due to extra time-like dimensions are less problematic than the tachyonic modes in the usual 4-dimensional setting because the most troublesome Feynman diagrams are forbidden once the conservation of momentum in the extra time-like dimensions is imposed.