Complete angular analysis of the decay cascadeB→D
** (→D
*(→Dπ)+π+W(→lv) |
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Authors: | P Białas J G Körner K Zalewski |
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Institution: | 1. Institute of Physics, Jagellonian University, ul. Reymonta 4, 30-059, Kraków, Poland 2. Institut für Physik, Johannes Gutenberg-Universit?t, Staudinger, Weg 7, Postfach 3980, W-6500, Mainz, Germany 3. Institut of Nuclear Physics, Krak'ow
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Abstract: | We develop a general algorithm for describing angular decay distributions in cascade decay chains of arbitrary length. The general algorithm is used to study joint angular decay distributions for the cascade decayB→D **(→D *(→Dπ)+W(→lv) where theD ** is a genericP-wave charm meson state. Lepton mass effects are fully incorporated. The joint angular decay distribution depend on 43 independently measurable decay parameters if the spin parity of theD ** is 1+ and on 48 decay parameters if the spin parity of theD ** is 2+. We give expressions for these decay parameters in terms of the helicity amplitudes of the two-body decay processes. An absolute prediction for all the parameters is presented in the framework of the heavy quark effective theory. A method for obtaining the helicity amplitudes from measured joint angular distributions is suggested. |
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