Browsing by Author "Hammad, Ahmed"

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    Large BR(h -> tau mu) in supersymmetric models
    (Amer Phyical Society, 2017-03-31) Hammad, Ahmed; Khalil, Shaaban; Ün, Cem Salih; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-0595-8803; N-3421-2014; 55325758100
    We analyze the lepton flavor-violating (LFV) Higgs decay h -> tau mu in three supersymmetric models: the minimal supersymmetric Standard Model, supersymmetric seesaw model, and supersymmetric B-L model with inverse seesaw (BLSSM-IS). We show that it is not possible to enhance BR(h ->tau mu) without violating the experimental bound on the BRd (tau -> mu gamma) in the generic minimal supersymmetric Standard Model, with nonuniversal slepton masses and/or trilinear couplings. In the supersymmetric seesaw model, where flavor mixing is radiatively generated, the LFV process mu -> e gamma strongly constrains the parameter space, and the maximum value of BR(h -> tau mu) is of order 10(-10), which is much smaller than the recent results reported by the CMS and ATLAS experiments. On the other hand, in the BLSSM-IS with universal soft supersymmetry-breaking terms defined at the grand unified scale, BR(h -> tau mu) can be accommodated in a wide region of the parameter space without violating LFV constraints. Even though the background processes in the LHC have very small cross sections, we also analyze the possible signal within the BLSSM-IS over the relevant background processes and show that a signal can be extracted. The analysis shows that confirmation of the LFV Higgs boson decay reported by CMS and ATLAS would favor the BLSSM-IS class of models.
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    Lepton flavor violating higgs decays in supersymmetric models
    (Amer Inst Physics, 2017) Hammad, Ahmed; Khalil, Shaaban; Akkuş, B.; Öktem, Y.; Doğan, G. S.; Güzelçimen, F.; Ün, Cem Salih; Uludağ Üniversitesi/Fen-Edebiyat Fakültesi/Fizik Bölümü.; 0000-0002-0595-8803; N-3421-2014; 55325758100
    The ATLAS and CMS collaborations reported the first signal of Lepton Flavor Violating (LFV) Higgs decay into tau and mu leptons. Standard Model forbids such processes at the renormalizable level because of lepton flavor symmetry. On the other hand, many extensions of the Standard Model do not exhibit such a symmetry and the models beyond the Standard Model (BSM) yield such processes. Hence, any signal for LFV processes can be interpreted as a direct probe for the BSM models. In this work, we consider LFV Higgs boson decays in a class of supersymmetric models including minimal supersymmetric extension of the SM (MSSM), Supersymmetric Type I Seesaw, and U(1)(B-L) extended MSSM supplied with the inverse seesaw mechanism for non-zero neutrino masses.