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${{\mathit \Lambda}_{{c}}^{+}}$ DECAY PARAMETERS

See the note on ``Baryon Decay Parameters'' in the neutron Listings.

$\alpha $ FOR ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{+}}$

INSPIRE   PDGID:

S033A

VALUE EVTS DOCUMENT ID TECN  COMMENT $\bf{ -0.84 \pm0.09}$ OUR AVERAGE $-0.80$ $\pm0.11$ $\pm0.02$ ABLIKIM 2019 AX BES3 ${{\mathit e}^{+}}{{\mathit e}^{-}}$ at 4.6 GeV $-0.78$ $\pm0.16$ $\pm0.19$ LINK 2006 A FOCS $\gamma $ A, ${{\overline{\mathit E}}}_{\gamma }${} $\approx{}$ 180 GeV $-0.94$ $\pm0.21$ $\pm0.12$ 414 1 BISHAI 1995 CLE2 ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $\approx{}{{\mathit \Upsilon}{(4S)}}$ $-0.96$ $\pm0.42$ ALBRECHT 1992 ARG ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $\approx{}10.4$ GeV $-1.1$ $\pm0.4$ 86 AVERY 1990 B CLEO ${{\mathit e}^{+}}{{\mathit e}^{-}}$ $\approx{}10.6$ GeV 1  BISHAI 1995 actually gives $\alpha =-0.94$ ${}^{+0.21}_{-0.06}{}^{+0.12}_{-0.06}$, chopping the errors at the physical limit $-1.0$. However, for $\alpha \approx{}-1.0$, some experiments should $\mathit get$ unphysical values ($\alpha <-1.0$), and for averaging with other measurements such values (or errors that extend below $-1.0$) should $\mathit not$ be chopped.

References:

ABLIKIM 2019AX PR D100 072004 Measurements of Weak Decay Asymmetries of $\Lambda_c^+\to pK_S^0$, $\Lambda\pi^+$, $\Sigma^+\pi^0$, and $\Sigma^0\pi^+$ LINK 2006A PL B634 165 Study of the Decay Asymmetry Parameter and $\mathit CP$ Violation Parameter in the ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{+}}$ Decay BISHAI 1995 PL B350 256 Measurement of the Decay Asymmetry Parameters in ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{+}}$ and ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Sigma}^{+}}{{\mathit \pi}^{0}}$ ALBRECHT 1992 PL B274 239 A Measurement of Asymmetry in the Decay ${{\mathit \Lambda}_{{c}}^{+}}$ $\rightarrow$ ${{\mathit \Lambda}}{{\mathit \pi}^{+}}$ AVERY 1990B PRL 65 2842 Measurement of the ${{\mathit \Lambda}_{{c}}^{+}}$ Decay Asymmetry Parameter

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