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We have Ignored flavour symmetry breaking which leads to penguin terms. Their oontribu- tion are very small (divided by the b-quark mass) in our ease, cf. ref. (10).
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On leave of absence from the Rudjer Bošković Institute, Zagreb, Croatia, Yugoslavia. Address from 1st September, 1981: Laboratoire de Physique Théorique et Hautes Energies, Université de Paris XI, 91405 Orsay, France.
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Guberina, B., Tadić, D. & Trampetić, J. Leading two-body weak-decay modes of λb . Lett. Nuovo Cimento 32, 193–197 (1981). https://doi.org/10.1007/BF02745348
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DOI: https://doi.org/10.1007/BF02745348