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Article type: Cover
2005 Volume 111 Issue 5 Pages
Cover1-
Published: August 20, 2005
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Article type: Appendix
2005 Volume 111 Issue 5 Pages
App1-
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Article type: Appendix
2005 Volume 111 Issue 5 Pages
E1-E2
Published: August 20, 2005
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Shinya Kanemura
Article type: Article
2005 Volume 111 Issue 5 Pages
E3-E6
Published: August 20, 2005
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We discuss a deep inerastic scattering process μN→τX to study lepton flavor violation between muons and tau leptons. In supersymmetric models, the Higgs boson mediated diagrams could be important. At a muon energy (E_μ) higher than 50 GeV, the predicted cross section significantly increases due to the contribution from sea b-quarks. The number of produced tau leptons can be O(10^4) at E_μ=300 GeV from 10^<20> muons, whereas O(10^2) events are given at E_μ=50 GeV. Another promising possibility to search for the eN→τX reaction at an electron-positron linear collider is also discussed. Searches for these reactions would be competitive with studies of rare tau decays and have potential to improve sensitivities to lepton flavor violation significantly.
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Toshihiko Ota, Joe Sato
Article type: Article
2005 Volume 111 Issue 5 Pages
E7-E10
Published: August 20, 2005
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Sin Kyu Kang, C. S. Kim, Jake Lee
Article type: Article
2005 Volume 111 Issue 5 Pages
E11-E14
Published: August 20, 2005
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The recent experimental measurements of the solar neutrino mixing angle θ_<sol> and the Cabibbo mixing angle θ_C reveal a surprising relation, θ_<sol>+θ_C≃π/4. We show that this empirical relation can be interpreted as a support of the idea of grand unification. In particular, we emphasis that the lepton mixing matrix derived from quark-lepton unification can lead to a shift of the complementarity relation at low energy. While the renormalization group effects generally lead to additive contribution on top of the shift, we discuss that the threshold corrections which may exist in some intermediate scale new physics such as supersymmetric standard model can diminish it, so we can achieve the complementarity relation at a low energy. Finally, we present a possibility to achieve the complementarity relation at a high energy by taking particular form of non-symmetric form of down Yukawa matrix.
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Koichi Funakubo
Article type: Article
2005 Volume 111 Issue 5 Pages
E15-E18
Published: August 20, 2005
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S. Tao
Article type: Article
2005 Volume 111 Issue 5 Pages
E19-E22
Published: August 20, 2005
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Zhi-zhong Xing
Article type: Article
2005 Volume 111 Issue 5 Pages
E23-E26
Published: August 20, 2005
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E. Senaha
Article type: Article
2005 Volume 111 Issue 5 Pages
E27-E29
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K. Hasegawa
Article type: Article
2005 Volume 111 Issue 5 Pages
E30-
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Tadashi Yoshikawa
Article type: Article
2005 Volume 111 Issue 5 Pages
E31-E34
Published: August 20, 2005
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We discuss a possibility of large electroweak penguin contribution in B→Kπ and ππ. The recent experimental data may be still suggesting that there are some discrepancies between the data and theoretical estimations. In B→Kπ decays, to explain several theoretical relations among the branching ratios, a slightly large electroweak penguin contribution and large strong phase differences or quite large color suppressed tree contribution seem to be needed. The contributions should appear also in B→ππ. We show, as an example, a solution to solve the discrepancies in both B→Kπ and B→ππ. It may be suggesting to need the large electroweak penguin contribution with new weak phases and some SU(3) breaking effects by new physics in both QCD and electroweak penguin type processes.
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Zhi-zhong Xing, He Zhang
Article type: Article
2005 Volume 111 Issue 5 Pages
E35-E38
Published: August 20, 2005
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We present an algebraic isospin approach towards a more straightforward and model-independent determination of the weak phase α (or Φ_2) and QCD penguin pollution in B→ππ decays. The world averages of current experimental data allow us to impose some useful constraints on the isospin parameters of B→ππ transitions. We find that the magnitude of α (or Φ_2) extracted from the indirect CP violation in π^+π^- mode is in agreement with the standard-model expectation from other indirect measurements, but its four-fold discrete ambiguity has to be resolved in the near future.
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H. Itoh, [in Japanese], [in Japanese]
Article type: Article
2005 Volume 111 Issue 5 Pages
E39-E42
Published: August 20, 2005
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Satoru Kaneko
Article type: Article
2005 Volume 111 Issue 5 Pages
E43-E46
Published: August 20, 2005
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Yoshio Koide
Article type: Article
2005 Volume 111 Issue 5 Pages
E47-E50
Published: August 20, 2005
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The maximal CP violation hypothesis depends on the phase convention of the CKM matrix, when we assume that three rotation angles in the CKM matrix are fixed by the observed values of |V_<us>|, |V_<cb>| and |V_<ub>|. Phase conventions which lead to successful prediction under the maximal CP violation hypothesis are only two: the original Kobayashi-Maskawa phase convention and the Fritzsch-Xing phase convention. Thereby, possible structures of the quark mass matrices are speculated.
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Mitsuru Kakizaki
Article type: Article
2005 Volume 111 Issue 5 Pages
E51-E54
Published: August 20, 2005
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We investigate constraints from null results of hadronic electric dipole moments (EDMs) searches on supersymmetric grand unified theories (SUSY GUTs). Especially we focus on (i) SUSY SU(5) GUTs with right-handed neutrinos and (ii) Kaluza-Klein GUTs in which both the GUT symmetry and SUSY are broken by boundary conditions in compactified extra dimensions. We demonstrate that hadronic EDM experiments severely constrain SUSY GUT models and are promising for probing the structure of GUT and SUSY breaking mediation mechanism.
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Jisuke Kubo
Article type: Article
2005 Volume 111 Issue 5 Pages
E55-E58
Published: August 20, 2005
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Takuya Morozumi
Article type: Article
2005 Volume 111 Issue 5 Pages
E59-E61
Published: August 20, 2005
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Seesaw model is an attractive model as leptogenesis model which may explain neutrino mass. There are many CP violating phases which are not thoroughly studied. In the leptogenesis scenario, the total lepton number is given by a sum of a family number. L=L_e+L_μ+L_τ. The family asymmetries L_<e,μ, τ> can vary by changing CP phases and depend on the form of the Dirac matrix and Majorana mass of the model. In this work, the relation between the low energy CP violation and the family asymmetries is studied. ・We develop the method with which one can obtain MNS matrix, Δ〜Jarlskog invariant, and the light neutrino mass eigenvalues, for a given set of heavy Majorana masses and m_D. With the formulae, one can study the relation of CP violation of low energy and leptogenesis (family asymmetries) in general. Also one can impose the constraints from the lepton mixings and neutrino mass squared differences of experiments. ・As an example which shows strong correlation bet. low energy CP violation and leptogenesis, one can find a scenario "one family dominant leptogenesis" (e.g., L=L_τ). We identify the two zero textures which leads to one family dominant leptogenesis scenarios. ・As an example which shows there is no correlation, we find the case that that even if all the lepton asymmetries are zero i.e., L=L_e=_μ=L_τ=0, the low energy CP violation of neutrino oscillation Δ can be non-zero. We identify the texture which has such property and study the unitarity triangle of the leptonic matrix for this case.
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T. Matsuda
Article type: Article
2005 Volume 111 Issue 5 Pages
E62-E64
Published: August 20, 2005
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R. Takahashi
Article type: Article
2005 Volume 111 Issue 5 Pages
E65-E68
Published: August 20, 2005
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[in Japanese], [in Japanese]
Article type: Article
2005 Volume 111 Issue 5 Pages
107-113
Published: August 20, 2005
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H. Tanaka, [in Japanese], [in Japanese]
Article type: Article
2005 Volume 111 Issue 5 Pages
114-116
Published: August 20, 2005
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Article type: Appendix
2005 Volume 111 Issue 5 Pages
App2-
Published: August 20, 2005
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Article type: Appendix
2005 Volume 111 Issue 5 Pages
App3-
Published: August 20, 2005
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Article type: Cover
2005 Volume 111 Issue 5 Pages
Cover2-
Published: August 20, 2005
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Article type: Cover
2005 Volume 111 Issue 5 Pages
Cover3-
Published: August 20, 2005
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