Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
2003-04-03
Nucl.Phys. B671 (2003) 459-482
Physics
High Energy Physics
High Energy Physics - Phenomenology
27 pages, 3 figures, sign error in factorization section corrected and comment on new BaBar result added
Scientific paper
10.1016/j.nuclphysb.2003.08.010
Decays of the kind $B_s\to D_s^{\pm}K^\mp, D_s^{\ast\pm}K^\mp, ...$ and $B_d\to D^{\pm}\pi^\mp, D^{\ast\pm}\pi^\mp, ...$ allow us to probe $\phi_s+\gamma$ and $\phi_d+\gamma$, respectively, involving the angle $\gamma$ of the unitarity triangle and the $B^0_q$--$\bar B^0_q$ mixing phases $\phi_q$ ($q\in\{d,s\}$). Analysing these modes in a phase-convention-independent way, we find that their mixing-induced observables are affected by a subtle $(-1)^L$ factor, where $L$ denotes the angular momentum of the $B_q$ decay products, and derive bounds on $\phi_q+\gamma$. Moreover, we emphasize that ``untagged'' rates are an important ingredient for efficient determinations of weak phases, not only in the presence of a sizeable width difference $\Delta\Gamma_q$; should $\Delta\Gamma_s$ be sizeable, the combination of untagged with tagged $B_s\to D_s^{\pm}K^\mp,D_s^{\ast\pm}K^\mp, ...$ observables provides an elegant and unambiguous extraction of $\tan(\phi_s+\gamma)$, whereas the conventional determination of $\phi_s+\gamma$ is affected by an eightfold discrete ambiguity. Finally, we propose a combined analysis of $B_s\to D_s^{\pm}K^\mp, D_s^{\ast\pm}K^\mp, ...$ and $B_d\to D^{\pm}\pi^\mp, D^{\ast\pm}\pi^\mp, ...$ modes, which has important advantages, offering various interesting new strategies to extract $\gamma$ in an essentially unambiguous manner.
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