Person: ÜN, CEM SALİH
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CEM SALİH
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Publication Electron and muon magnetic moments and implications for dark matter and model characterisation in non-universal U(1)′ supersymmetric models(Springer, 2021-09-16) Frank, Mariana; Hiçyılmaz, Yaşar; Mondal, Subhadeep; Özdal, Özer; Ün, Cem Salih; ÜN, CEM SALİH; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-0595-8803; N-3421-2014We attribute deviations of the muon and electron magnetic moments from the theoretical predictions to the presence of an additional U(1)' supersymmetric model. We interpret the discrepancies between the muon and electron anomalous magnetic moments to be due to the presence of non-universal U(1)' charges. In a minimally extended model, we show that requiring both deviations to be satisfied imposes constraints on the spectrum of the model, in particular on dark matter candidates and slepton masses and ordering. Choosing three benchmarks with distinct dark matter features, we study implications of the model at colliders, concentrating on variables that can distinguish our non-universal scenario from other U(1)' implementations.Publication B - Yukawa unification in SUSY SU(5) with mirage mediation: LHC and dark matter implications(Springer, 2019-05-08) Raza, Shabbar; Shafi, Qaisar; Ün, Cem Salih; ÜN, CEM SALİH; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü; 0000-0002-0595-8803; N-3421-2014We consider a class of b - Yukawa unified Supersymmetric (SUSY) SU(5) GUTs, in which the asymptotic gaugino M-1,M-2,M-3 masses are generated through the mirage mediated supersymmetry breaking, which is a combination of the gravity and anomaly mediation. Due to the contributions from the anomaly contribution, M-3 is always lighter than M-1 and M-2, and consequently for the range of asymptotic masses considered, the gluino mass mg at low scale is bounded from above at about 4 TeV. We realize two different regions, in one of which the MSSM -term is less than about 3 TeV. This region yields a stop mass up to 5 TeV, and the stop mass is nearly degenerate with the LSP neutralino for mass around 0.8 to 1.7 TeV. A stau mass can be realized up to about 5 TeV, and the stau mass is approximately degenerate with the LSP neutralino for mass around 2 to 3 TeV. In addition, an A-funnel solution with mA approximate to 2m approximate to 700-900 GeV is realized. These three cases yield LSP dark matter abundance in accordance with observations. A second region, on the other hand, arises for 10. The -term is rather large (20 TeV), and the LSP neutralino is a bino-wino mixture. The gluino mass (approximate to 0.8-1.2 TeV) is nearly degenerate with the LSP neutralino mass and hence, the gluino-neutralino coannihilation processes play a role in reducing the relic abundance of LSP neutralino down to ranges allowed by the current WMAP measurements. The two regions above can be distinguished through the direct detection experiments. The first region with relatively low values yields Higgsino-like DM, whose scattering on the nucleus typically has a large cross-section. We find that such solutions are still allowed by the current results from the LUX experiment, and they will be severely tested by the LUX-Zeplin (LZ) experiment. The second region contains bino-wino DM whose scattering cross-section is relatively low. These solutions are harder to rule out in the foreseeable future.Publication Sparticle spectroscopy and dark matter in a U(1) B-L extension of MSSM(Springer, 2021-01-26) Ahmed, Waqas; Raza, Shabbar; Shafi, Qaisar; Ün, Cem Salih; Zhu, Bin; ÜN, CEM SALİH; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/ Fizik Bölümü; 0000-0002-0595-8803; N-3421-2014We consider a class of SUSY models in which the MSSM gauge group is supplemented with a gauged U(1)(B-L) symmetry and a global U(1)(R) symmetry. This extension introduces only electrically neutral states, and the new SUSY partners effectively double the number of states in the neutralino sector that now includes a blino (from B - L) and singlino from a gauge singlet superfield. If the DM density is saturated by a LSP neutralino, the model yields quite a rich phenomenology depending on the DM composition. The LSP relic density constraint provides a lower bound on the stop and gluino masses of about 3 TeV and 4 TeV respectively, which is testable in the near future collider experiments such as HL-LHC. The chargino mass lies between 0.24 TeV and about 2.0 TeV, which can be tested based on the allowed decay channels. We also find m tau1 greater than or similar to 500 GeV, and me,m mu,mvS,P greater than or similar to 1 TeV. We identify chargino-neutralino coannihilation processes in the mass region 0.24 TeV less than or similar to m chi 10approximate to mchi 1+/- less than or similar to 1.5 TeV, and also coannihilation processes involving stau, selectron, smuon and sneutrinos for masses around 1 TeV. In addition, A(2) resonance solutions are found around 1 TeV, and H-2 and H-3 resonance solutions are also shown around 0.5 TeV and 1 TeV . Some of the A(2) resonance solutions with tan beta greater than or similar to 20 may be tested by the A/H -> tau (+)tau (-) LHC searches.. While the relic density constraint excludes the bino-like DM, it is still possible to realize higgsino, singlino and blino-like DM for various mass scales. We show that all these solutions will be tested in future direct detection experiments such as LUX-Zeplin and Xenon-nT.