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ÜN, CEM SALİH

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CEM SALİH

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  • Küçük Resim
    YayınAçık Erişim
    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-3421-2014
    We 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.
  • Küçük Resim
    YayınAçık Erişim
    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-3421-2014
    We 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.