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Study of the KL→π⁰ννDecay at the J-PARC KOTO Experiment / J-PARC KOTO実験におけるKL→π⁰νν崩壊探索の研究Shinohara, Satoshi 26 July 2021 (has links)
京都大学 / 新制・課程博士 / 博士(理学) / 甲第23403号 / 理博第4738号 / 新制||理||1679(附属図書館) / 京都大学大学院理学研究科物理学・宇宙物理学専攻 / (主査)教授 中家 剛, 准教授 田島 治, 准教授 成木 恵 / 学位規則第4条第1項該当 / Doctor of Science / Kyoto University / DFAM
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Flavor Changing Neutral Current Processes In The Framework Of The Two Higgs Doublet ModelTuran, Ismail 01 January 2003 (has links) (PDF)
It is widely believed that the Standard Model (SM) can not be a fundamental
theory of the basic interactions. Originated from this fact, many new physics
models have been proposed. Among them, the two Higgs doublet model (2HDM),
the SM enlarged by adding one extra scalar doublet, is considered as the simplest extension of the SM.
In this work, within the framework of the model III version of the 2HDM,
the exclusive decay the branching ratio is calculated and discussed in various physical regions determined by model parameters. It is
observed that it is possible to reach present experimental upper limits in model Finally, the
avor changing top quark decay,
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The Standard Model Analyasis Of The Cp Violation In The Inclusive Semileptonic B-meson DecaysEygi, Zeynep Deniz 01 February 2005 (has links) (PDF)
Being a flavor changing neutral current process, inclusive semileptonic B- meson decays provide reliable testing grounds for the Standard Model at the loop level. They are also importanat in the CKM phenomology and investing the CP violation due to the existence of sizable interference terms in the decay amplitude. In this work , the rare inclusive semileptonic B- meson decays for (lepton is electron ,muon , tau) are investigated in the context of the Standard Model.The differential branching ratio, forward-backward asymmetry ,CP &ndash / violating asymmetry and CP &ndash / violating asymmetry in the forward-backward asymmetry in these processes are examined.The dependencies of these physical parameters on the Standard Model parametres are analyzed by paying a special attention to the long distance effects. Although the branching ratios predicted for the inclusive semileptonic B- meson decays are relatively small because of CKM suppression , it has been found that there is a significant ACP and ACP(AFB) for these processes.
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The Inclusive Semileptonic Decays Of The B-meson In A Cp Softly Broken Two Higgs Doublet ModelAcar, Hilal 01 January 2004 (has links) (PDF)
In this work, the B-> / X_dell ell decays are examined in the context of a
CP softly broken two Higgs doublet model. The differential
branching ratio, forward-backward asymmetry, CP-violating
asymmetry, CP-violating asymmetry in the forward-backward
asymmetry and polarization asymmetries of the final lepton in this
decay are studied. The dependencies of these physical parameters
on the model parameters are analyzed by paying a special attention
to the effects of neutral Higgs boson (NHB) exchanges and possible
CP violating effects. It has been found that NHB effects are
quite significant for the tau mode and the above-mentioned
observables seems to be promising as a testing ground for new
physics beyond the SM, especially for the existence of the
CP-violating phase in the theory.
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The Polarization Properties Of The Final State Particles In The Rare Radiative B-meson DecayYilmaz, Umit Oktay 01 May 2005 (has links) (PDF)
A general analysis of the photon and lepton polarizations in the rare Bs & / #8594 / & / #61543 / l+l- decay by using the most general model independent form of the effective Hamiltonian is presented. The total and the differential branching ratios for these decays, when photon is in the positive and negative helicity states, are studied. The sensitivity of " / photon polarization asymmetry" / and the longitudinal, transverse and normal polarization asymmetries of final state leptons, as well as lepton-antilepton combined asymmetries in Bs & / #8594 / & / #61543 / l+l- decay to the new Wilson coefficients are also investigated.
It is shown that all these physical observables are very sensitive to the existence of new physics beyond SM and their experimental measurements can give valuable information about it.
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