Browsing by Author "Selbuz, Levent"

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Charged higgs boson in MSSM and beyond
(Amer Phyical Soc, 2018-06-27) Hıçyılmaz, Yaşar; Selbuz, Levent; Solmaz, Levent; Ün, Cem Salih; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-0595-8803; N-3421-2014; 55325758100
We conduct a numerical study over the constrained MSSM (CMSSM), next-to-MSSM (NMSSM) and U(1) extended MSSM (UMSSM) to probe the allowed mass ranges of the charged Higgs boson and its dominant decay patterns, which might come into prominence in the near future collider experiments. We present results obtained from a limited scan for CMSSM as a basis and compare its predictions with the extended models. We observe within our data that a wide mass range is allowed as 0.5(1) less than or similar to m(H)(+/-) less than or similar to 17 TeV in UMSSM (NMSSM). We find that the dominant decay channel is mostly (H-+/- -> tb) such that BR(H-+/- -> tb) similar to 80%. While this mode remains dominant over the whole allowed parameter space of CMSSM, we realize some special domains in the NMSSM and UMSSM, in which BR(H-+/- -> tb) less than or similar to 10%. In this context, the decay patterns of the charged Higgs can play a significant role to distinguish among the SUSY models. In addition to the tb decay mode, we find that the narrow mass scale in CMSSM allows only the decay modes for the charged Higgs boson to tau nu (similar to 16%), and their supersymmetric partners (tau) over tilde(nu) over tilde (similar to 13%). On the other hand, it is possible to realize the mode in NMSSM and UMSSM in which the charged Higgs boson decays into a chargino and neutralino pair up to about 25%. This decay mode requires nonuniversal boundary conditions within the MSSM framework to be available, since CMSSM yields BR(H-+/- -> (chi) over tilde (1)(0)<(chi(+/-)(1))over tilde>) less than or similar to. 1%. It can also be probed in the near future collider experiments through the missing energy and CP-violation measurements. Moreover, the chargino mass is realized as m((chi) over tilde1)(+/-) TeV in NMSSM and UMSSM, and these solutions will be likely tested soon in collider experiments through the chargino-neutralino production. Focusing on the chargino-neutralino decay patterns, we also present tables which list the possible ranges for the charged Higgs production and decay modes.
Monophoton events with light Higgs bosons in the secluded UMSSM
(Amer Physical Soc, 2023-10-03) Hiçyılmaz, Yaşar; Selbuz, Levent; Ün, Cem Salih; ÜN, CEM SALİH; Bursa Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-0595-8803 ; N-3421-2014
We explore the Higgs boson implications of a class of supersymmetric models, which extends the MSSM gauge group by a U(1)' symmetry, which is broken at low energy scales by vacuum expectation values of four MSSM singlet fields. These singlets also form a secluded sector, and one of them is allowed to interact with the MSSM Higgs fields directly. After the U(1)' and electroweak symmetry breaking, the low scale spectra include six CP -even and four CP-odd Higgs bosons, whose masses can lie from 80 GeV to 2-3 TeV. We find that the heavy CP-even Higgs bosons can be probed through their decays into a pair of SM gauge bosons currently up to about m(hi) similar or equal to 1.5 TeV, while their probe can be extended to about mh(i) similar or equal to 2.5 TeV in the near future. The most interesting feature of the low scale spectra in the class of secluded U(1)' models is to include two light CP -odd Higgs bosons whose masses are bounded at about 250 GeV by the current collider and DM experiments, when the LSP neutralino is mostly formed by the MSSM singlets. These light CP -odd Higgs bosons should be formed by the MSSM singlet scalars to be consistent with the current constraints. Despite their singlet nature, they can be traced through their associated production with photons. In our work, we consider their productions at the collider experiments together with photons, and we realize that these light Higgs bosons can potentially be probed during Run-3 experiments of LHC when they are lighter than about 100 GeV. We also show that Run-4 and HL-LHC experiments will be able to probe these light scalars up to about 250 GeV.