Color suppressed contributions to the decay modes , , and

J. O. Eeg; S. Fajfer; A. Prapotnik

doi:10.1140/epjc/s2005-02243-8

EPJ

Color suppressed contributions to the decay modes $B_{d,s} \to D_{s,d} D_{s,d}$ , $B_{d,s} \to D_{s,d} D^*_{s,d}$ , and $B_{d,s} \to D^*_{s,d} D^*_{s,d}$

J. O. Eeg¹^*, S. Fajfer²^,3 and A. Prapotnik³

¹ Department of Physics, University of Oslo, Blindern, P.O. Box 1048, 0316, Oslo, Norway
² Department of Physics, University of Ljubljana, Jadranska 19, 1000, Ljubljana, Slovenia
³ J. Stefan Institute, Jamova 39, P. O. Box 3000, 1001, Ljubljana, Slovenia

Abstract

The amplitudes for decays of the type $B_{d,s} \to D_{s,d} D_{s,d}$ , have no factorizable contributions, while $B_{d,s} \to D_{s,d} D^*_{s,d}$ , and $B_{d,s} \to D^*_{s,d} D^*_{s,d}$ have relatively small factorizable contributions through the annihilation mechanism. The dominant contributions to the decay amplitudes arise from chiral loop contributions and tree level amplitudes which can be obtained in terms of soft gluon emissions forming a gluon condensate. We predict that the branching ratios for the processes $\bar B^0_d \to D_s^ + D_s^-$ , $\bar B^0_d \to D_s^{ + *} D_s^-$ and $\bar B^0_d \to D_s^ + D_s^{-*}$ are all of order (2- 3) x 10^-4, while $\bar B^0_s \to D_d^ + D_d^-$ , $\bar B^0_s \to D_d^{ + *} D_d^-$ and $\bar B^0_s \to D_d^ + D_d^{-*}$ are of order (4- 7) x 10^-3. We obtain branching ratios for two D ^*’s in the final state of order two times bigger.

12 Internat. Congress of the Balkan Physical Union
July 8-12, 2025
Bucharest, Romania

EPJ

Color suppressed contributions to the decay modes $B_{d,s} \to D_{s,d} D_{s,d}$ , $B_{d,s} \to D_{s,d} D^_{s,d}$ , and $B_{d,s} \to D^_{s,d} D^*_{s,d}$

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