Two Topics in $b$ Physics

Details Two Topics in $b$ Physics Two Topics in $b$ Physics

1996-04-15

arxiv.org/abs/hep-ph/9604319v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

11 pages, latex, no figures. Presented at 10th La Thuile Rencontre. DESY preprint no. corrected in heading

Scientific paper

(1) A simple transversity analysis permits one to separate the P-even and P-odd partial waves in such decays as $B_s \to J/\psi \phi$ and $B \to J/\psi K^*$. This method is relevant to the separation of contributions of CP-even and CP-odd final states in $B_s$ decays, and hence to the measurement of a possible lifetime difference between mass eigenstates. (2) The enhancement $\Delta \Gamma (\Lambda_b)$ of the $\Lambda_b$ decay rate due to four-fermion processes is calculated in terms of the $\Sigma_b^* - \Sigma_b$ hyperfine splitting, the $B^* - B$ hyperfine splitting, and the $B$ meson decay constant $f_B$. Despite a relatively large hyperfine splitting observed by the DELPHI Collaboration, the mechanism falls far short of being able to explain the observed enhancement.

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