HADRONIC PHASES AND ISOSPIN AMPLITUDES IN D(B) -] PI-PI AND D(B) -] KAPPA(KAPPA)OVER-BAR DECAY

Hadronic phases in pi pi and <K(K)over bar> channels are calculated a la Regge. At the D mass one finds delta(pi pi) similar or equal to pi/ 3 and delta(<K(K)over bar>) similar or equal to -pi/6 good agreement w ith the CLEO data while at the B mass these angles are predicted to be , respectively, 11 degrees and -7 degrees. With the hadronic phase e(i delta<K(K)over bar>) taken into account, a quark diagram decompositio n of the isospin invariant amplitudes in D --> <K(K)over bar> decays f its the data provided the exchange diagram contribution is about 1/3 o f the tree level one. (C) 1998 Elsevier Science B.V. All rights reserv ed.