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Long distance contributions to the eta(b) ---> J / psi J / psi decay
No full textIt was argued long ago that eta(b) could be observed through the eta(b)-> J/psi(->mu(+)mu(-))J/psi(->mu(+)mu(-)) decay chain. Recent calculations indicate that the width of eta(b) into two J/psi is almost 3 orders of magnitude smaller than the one into the D (D) over bar*. We study the effects of final-state interactions due to the D (D) over bar* intermediate state on the J/psi J/psi final state. We find that the inclusion of this contribution may enhance the short-distance branching ratio up to about 2 orders of magnitude
Final state interaction effects on the eta(b) ---> J/psi J/psi decay.
No full textNon-leptonic decays of bottomi
Numerov and phase-integral methods for charmonium
Full text linkThis paper applies the Numerov and phase-integral methods to the stationary
Schrodinger equation that studies bound states of charm anti-charm quarks. The
former is a numerical method well suited for a matrix form of second-order
ordinary di erential equations, and can be applied whenever the stationary
states admit a Taylor-series expansion. The latter is an analytic method that
provides, in principle, even exact solutions of the stationary Schrodinger
equation, and well suited for applying matched asymptotic expansions and higher
order quantization conditions. The Numerov method is found to be always in
agreement with the early results of Eichten et al., whereas an original
evaluation of the phase-integral quantization condition clarifies under which
conditions the previous results in the literature on higher-order terms can be
obtained.Comment: 23 pages, 2 tables and 2 figures. In the final version, the
presentation and the numerical analysis have been improved, and a misprint in
Eq. (2.3) has been amende
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