Hadronic Weak Decays of Λ_b Baryon in the Covariant Oscillator Quark Model : Particles and Fields

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概要

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• Cabibbo allowed two-body hadronic weak decays of Λ_b baryons are analyzed in the factorization approximation. We use the covariant oscillator quark model to evaluate the heavy → heavy and heavy → light form factors. When applied in the heavy quark limit, our form factors satisfy all the constraints imposed by heavy quark symmetry. The decay rates and up-down asymmetries for Λ_b baryon decaying into Λ_c + P(V) are calculated. It is found that the up-down asymmetry is negative in all these decay modes. Furthermore, the prediction Br(Λ_b → Λ + J/ψ) = 2.49 x 10^<-4> is consistent with the recent experimental data. Finally it is pointed out that the CKM-Wolfenstein parameter ρ^2 +η^2 where η is the CP phase, can be determined from the ratio of the widths Λ_b → ΛD^^-^0 and Λ_b → ΛJ/ψ, independent of the QCD parameter. The value of (ρ^2 +η^2)^<1/2> calculated in our model agrees very well with the value recently predicted by Rosner.

• 理論物理学刊行会の論文
• 1999-04-25

著者

• Giri Anjan

  Department Of Physics Panjab University

• Khanna M

  Department Of Physics Panjab University

• ISHIDA Shin

  Atomic Energy Research Institute, College of Science and Technology, Nihon University

• ODA Masuho

  Faculty of Engineering, Kokushikan University

• ISHIDA Muneyuki

  Department of Physics, Tokyo Institute of Technology

• MOHANTA Rukmani

  Department of Physics, Panjab University

• KHANNA Mohinder

  Department of Physics, Panjab University

• Mohanta R

  Department Of Physics Panjab University

• Mohanta Rukmani

  Department Of Physics Panjab University

• Khanna Mohinder

  Department Of Physics Panjab University

• Ishida Muneyuki

  Department Of Physics School Of Science And Engineering Meisei University

• Oda M

  School Of Science And Engineering Kokushikan University

• Oda Masuho

  Faculty Of Engineering Kokushikan University

• Ishida S

  Research Institute Of Science And Technology College Of Science And Technology Nihon University

• ODA Masuho

  School of Science and Engineering, Kokushikan University

• ISHIDA Shin

  Research Institute of Science and Technology, College of Science and Technology, Nihon University

• Ishida M

  Tokyo Inst. Technol. Tokyo Jpn

• Ishida Shin

  Atomic Energy Research Institute College Of Science And Technolgy Nihon University

• GIRI Anjan

  Department of Physics, Panjab University

• ISHIDA Shin

  Department of Physics and Atomic Energy Research Institute College of Science and Technology, Nihon University

• ISHIDA Shin

  College of Science & Technology, Nihon University Tokyo

• ISHIDA Shin

  Atomic Energy Research Institute, College of Science and Technology Nihon University

• ISHIDA Shin

  Atomic Energy Research Institute, College of Scinence and Technology Nihon University

• ISHIDA Muneyuki

  Department of Physics,University of Tokyo

• ODA Masuho

  Faculty of Engineering. Kokushikan University

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