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- W99876827 abstract "We consider the decay ${B}^{0}(t)ensuremath{rightarrow}mathrm{h}mathrm{y}mathrm{p}mathrm{e}mathrm{r}mathrm{o}mathrm{n}+mathrm{a}mathrm{n}mathrm{t}mathrm{i}mathrm{h}mathrm{y}mathrm{p}mathrm{e}mathrm{r}mathrm{o}mathrm{n},$ followed by hyperon weak decay. We show that parity violation in the latter allows us to reach new CP observables: not only $mathrm{Im}{ensuremath{lambda}}_{f}$ but also $mathrm{Re}{ensuremath{lambda}}_{f}$ can be measured. In the decay ${B}_{d}^{0}(t)ensuremath{rightarrow}ensuremath{Lambda}overline{ensuremath{Lambda}}(BRensuremath{sim}{10}^{ensuremath{-}6}),stackrel{ensuremath{rightarrow}}{ensuremath{Lambda}}p{ensuremath{pi}}^{ensuremath{-}}$ these observables reduce to $mathrm{sin}2ensuremath{alpha}$ and $mathrm{cos}2ensuremath{alpha}$ in the small penguin limit, the latter solving the discrete ambiguity $stackrel{ensuremath{rightarrow}}{ensuremath{alpha}}ensuremath{pi}/2ensuremath{-}ensuremath{alpha}.$ For ensuremath{beta} one could consider the Cabibbo suppressed mode ${B}_{d}^{0}(t)ensuremath{rightarrow}{ensuremath{Lambda}}_{c}^{+}overline{{ensuremath{Lambda}}_{c}^{+}}(BRensuremath{sim}{10}^{ensuremath{-}4}),{ensuremath{Lambda}}_{c}^{+}ensuremath{rightarrow}ensuremath{Lambda}{ensuremath{pi}}^{+},p{K}^{0},dots{}$ (with $mathrm{BR}ensuremath{sim}{10}^{ensuremath{-}2}).$ The pure penguin modes ${B}_{s}^{0}(t)ensuremath{rightarrow}{ensuremath{Sigma}}^{ensuremath{-}}overline{{ensuremath{Sigma}}^{ensuremath{-}}},{ensuremath{Xi}}^{ensuremath{-}}overline{{ensuremath{Xi}}^{ensuremath{-}}},{ensuremath{Omega}}^{ensuremath{-}}overline{{ensuremath{Omega}}^{ensuremath{-}}}(BRensuremath{sim}{10}^{ensuremath{-}7})$ can be useful in the search of CP violation beyond the standard model. Because of the small total rates, the study of these modes could only be done in future high statistics experiments. Also, in the most interesting case $ensuremath{Lambda}overline{ensuremath{Lambda}}$ the time dependence of the asymmetry can be difficult to reconstruct. On the other hand, we show that ${B}_{d}$ mesons, being a coherent source of $ensuremath{Lambda}overline{ensuremath{Lambda}},$ are useful to look for CP violation in ensuremath{Lambda} decay. We also discuss ${B}_{d}^{0}(t)ensuremath{rightarrow}J/ensuremath{psi}{K}^{*0}ensuremath{rightarrow}{l}^{+}{l}^{ensuremath{-}}{K}_{S}{ensuremath{pi}}^{0}$ where the secondary decays conserve parity, and angular correlations allow us to determine terms of the form $mathrm{cos}ensuremath{delta}mathrm{cos}2ensuremath{beta},$ ensuremath{delta} being a strong phase. This phase has been measured by CLEO, but we point out that a discrete ambiguity prevents us from determining $mathrm{sgn}(mathrm{cos}2ensuremath{beta}).$ However, if one assumes small strong phases, like in factorization and as supported by CLEO data, one could have information on $mathrm{sgn}(mathrm{cos}2ensuremath{beta}).$ Similar remarks can be made for $mathrm{cos}2ensuremath{alpha}$ in the decay ${B}_{d}^{0}(t)ensuremath{rightarrow}ensuremath{rho}stackrel{ensuremath{rightarrow}}{ensuremath{rho}}4ensuremath{pi}.$" @default.
- W99876827 created "2016-06-24" @default.
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- W99876827 date "1998-10-29" @default.
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- W99876827 title "NewCPobservables inB0(t)→hyperon+antihyperonfrom parity violation in the sequential decay" @default.
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- W99876827 doi "https://doi.org/10.1103/physrevd.58.114021" @default.
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