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Patrick. J. O'Donnell

Publications and source records attributed to Patrick. J. O'Donnell.

3 recordsLinked to original sources
arXiv1999

Measuring $β$ in $B \to D^{*+}D^{*-}K_s$ Decays

We consider the possibility of measuring both $\sin (2 β)$ and $\cos (2 β)$ in the KM unitarity triangle using the process $B^0 \to D^{*+}D^{*-}K_s$. This decay mode has a higher branching fraction (O(1%)) than the mode $B^0 \to D^{*+}D^{*-}$. We use the factorization assumption and heavy hadron chiral perturbation theory to estimate the branching fraction and polarization. The time dependent rate for $B^0(t) \to D^{*+} D^{*-} K_s$ can be used to measure $\sin (2 β)$ and $\cos(2 β)$ . Furthermore, examination of the $D^{*+} K_s$ mass spectrum may be the best way to experimentally find the broad $1^+$ p-wave $D_s$ meson.

hep-ph↗
arXiv1999

Flavor Changing processes in Quarkonium Decays

We study flavor changing processes $Υ\to B/{\bar B} X_s$ and $J/ψ\to D/{\bar D} X_u$ in the B factories and the Tau-Charm factories. In the standard model, these processes are predicted to be unobservable, so they serve as a probe of the new physics. We first perform a model independent analysis, then examine the predictions of models; such as TopColor models, MSSM with R-parity violation and the two Higgs doublet model; for the branching ratios of $Υ\to B/{\bar B} X_s$ and $J/ψ\to D/{\bar D} X_u$ . We find that these branching ratios could be as large as $10^{-6}$ and $10^{-5}$ in the presence of new physics.

hep-ph↗
arXiv1999

Implications of Isospin Conservation in $Λ_b$ Decays and Lifetime

We consider isospin predictions for the semi-leptonic and non-leptonic decays of the $Λ_b$ baryon. Isospin conservation of the strong interactions constrains the possible final states in $Λ_b$ decays. Since the baryon hyperfine splittings depend upon light quark dynamics and do not decrease with increasing heavy quark mass, this leads in general to to phase space enhancements in $Λ_b$ decays relative to $B$ meson decays for the same underlying quark transitions. Consequently the $Λ_b$ lifetime is smaller than the $B$ lifetime. Phase space enhancements in $Λ_b$ decays relative to $B$ decays can be understood in terms of hyperfine interactions in the heavy quark system.

hep-ph↗