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Particles and Fields


Eur. Phys. J. C 22, 115-121 (2001)
DOI: 10.1007/s1005201O0774

Analysis of direct CP violation in $B^- \to D^0 D_s^-, D^0 D^-$ decays

A.K. Giri1, R. Mohanta2 and M.P. Khanna1

1  Physics Department, Panjab University, Chandigarh-160 014, India
2  School of Physics, University of Hyderabad, Gachibowli, Hyderabad-500 046, India

(Received: 5 June 2001 / Revised version: 24 July 2001 / Published online: 19 September 2001 - © Springer-Verlag / Società Italiana di Fisica 2001 )

Abstract
We investigate the possibility of observing direct CP violation in the decay modes $B^- \to D^0 D_s^- $ and D0 D- within the standard model. Including the contributions arising from the tree, annihilation, QCD as well as electroweak penguins with both time- and space-like components, we find that the direct CP asymmetry in $B^- \to D^0 D_s^- $ is very small, $ \sim 0.2 $%, but in $B^- \to D^0 D^- $ decay it can be as large as 4%. Approximately 107 charged B mesons are required to experimentally observe the CP asymmetry parameter for the latter case. Since this is easily accessible with the currently running B-factories, the decay mode $B^- \to D^0 D^- $ may be pursued to look for CP violation.



© Società Italiana di Fisica, Springer-Verlag 2001