Browsing by Author "Gogoladze, Ilia"

Now showing 1 - 5 of 5

Gauge mediation models with adjoint messengers
(Amer Physical Soc, 2016-10-24) Gogoladze, Ilia; Mustafayev, Azar; Shafi, Qaisar; Ün, Cem Salih; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-0595-8803; N-3421-2014; 7004752140; 55325758100
We present a class of models in the framework of gauge mediation supersymmetry breaking where the messenger fields transform in the adjoint representation of the standard model gauge symmetry. To avoid unacceptably light right-handed sleptons in the spectrum we introduce a nonzero U(1)(B-L) D-term. This leads to an additional contribution to the soft supersymmetry breaking mass terms which makes the right-handed slepton masses compatible with the current experimental bounds. We show that in this framework the observed 125 GeV Higgs boson mass can be accommodated with the sleptons accessible at the LHC, while the squarks and gluinos lie in the multi-TeV range. We also discuss the issue of the fine-tuning and show that the desired relic dark matter abundance can also be accommodated.
Muon g-2 in gauge mediated supersymmetry breaking models with adjoint messengers
(Amer Physical, 2017-02-24) Gogoladze, Ilia; Ün, Cem Salih; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-0595-8803; N-3421-2014; 55325758100
We explored the sparticle mass spectrum in light of the muon g -2 anomaly and the little hierarchy problem in a class of the gauge mediated supersymmetry breaking model. Here, the messenger fields transform in the adjoint representation of the Standard Model gauge symmetry. To avoid unacceptably light right-handed slepton masses, the Standard Model is supplemented by the additional U(1)(B-L) gauge symmetry. A nonzero U(1)(B-L) D term makes the right-handed slepton masses compatible with the current experimental bounds. We show that in the framework of Lambda(3) < 0 and mu < 0 the muon g -2 anomaly and the observed 125 GeV Higgs boson mass can be simultaneously accommodated. The slepton masses in this case are predicted to lie in the few hundred GeV range, which can be tested at the LHC. Despite the heavy colored sparticle spectrum, the little hierarchy problem in this model can be ameliorated, and the electroweak fine-tuning parameter can be as low as 10 or so.
Proton lifetime in minimal SUSY SU(5) in light of LHC results
(Springer, 2022-02-21) Babu, K. S.; Gogoladze, Ilia; Ün, Cem Salih; ÜN, CEM SALİH; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; 0000-0002-0595-8803; N-3421-2014
We examine proton decay mediated by color-triplet Higgsinos in minimal supersymmetric SU(5) grand unified theory in light of the discovery of the Higgs boson and the absence of SUSY signals at the LHC. We pay special attention to various threshold effects arising from Planck-suppressed operators that affect the color-triplet Higgsino mass and also allow for correcting the wrong mass relations for the light fermions. Our analysis allows for a non-universal SUSY spectrum with the third family sfermions having a separate mass compared to the first two families. We identify the allowed parameter space of the model and show that the SUSY scalar masses are constrained by current limits from proton lifetime to be above 5 TeV, while the glunio, Wino and the Higgsinos may be within reach of the LHC. When the SUSY scalar masses are required to be <= 30 TeV, so that they are within reach of next generation collider experiments, we find that proton lifetime for the decay p -> (nu) over barK(+) is bounded by tau(p -> (nu) over barK(+)) <= 1.1 x 10(35) yrs.
Reconciling the muon g-2, a 125 GeV Higgs boson, and dark matter in gauge mediation models
(The American Physical Society, 2015-12-17) Gogoladze, Ilia; Shafi, Qaisar; Ün, Cem Salih; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-0595-8803; N-3421-2014; 55325758100
We present a class of models in the framework of gauge mediation supersymmetry breaking where the standard model is supplemented by additional U(1) symmetry which acts only on the third generation fermions. The messenger fields carry a nontrivial U(1) charge and are vectorlike particles under this symmetry. This leads to additional contributions to the soft supersymmetry breaking mass terms for the third-generation squarks and sleptons. In this framework we show that the muon g - 2 anomaly, the observed 125 GeV Higgs boson mass and the detected relic dark matter abundance (gravitino in our case) can be simultaneously accommodated. The resolution of the muon g - 2 anomaly, in particular, yields the result that masses of squarks in the first two families, as well the gluino mass, should be less than or similar to 2.5 TeV, which will be tested at LHC14.
Yukawa unification and sparticle spectroscopy in gauge mediation models
(Amer Physical, 2015-05-18) Gogoladze, Ilia; Mustafayev, Azar; Shafi, Qaisar; Un, Cem Salih; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-0595-8803; N-3421-2014; 55325758100
We explore the implications of the t-b-tau (and b-tau) Yukawa coupling unification condition on the fundamental parameter space and sparticle spectroscopy in the minimal gauge mediated supersymmetry breaking model. We find that this scenario prefers values of the CP-odd Higgs mass m(A) greater than or similar to 1 TeV, with all colored sparticle masses above 3 TeV. These predictions will be hard to test at LHC13 but they may be testable at the high-energy LHC (HE-LHC) 33 TeV or a 100 TeV collider. Both the t-b-tau and the b-tau Yukawa coupling unification prefer a relatively light gravitino with mass less than or similar to 30 eV, which makes it a candidate hot dark matter particle. However, it cannot account for more than 15% of the observed dark matter density.