Measurement of the asymmetry parameter for the decay $\bar\Lambda \to \bar p\pi^+$

Ablikim, M.; Bai, J.Z.; Bai, Y.; Ban, Y.; Cai, X.; Chen, H.F.; Chen, H.S.; Chen, H.X.; Chen, J.C.; Chen, Jin

doi:10.1103/PhysRevD.81.012003

Measurement of the asymmetry parameter for the decay $\bar\Lambda \to \bar p\pi^+$

BES

Collaboration

Nov, 2009

9 pages

Published in:

Phys.Rev.D 81 (2010) 012003

e-Print:

0911.2972 [hep-ex]

DOI:

10.1103/PhysRevD.81.012003

PDG:

\alpha _{+}

FOR

{{\overline{\mathit \Lambda}}}

\rightarrow

{{\overline{\mathit p}}}{{\mathit \pi}^{+}}

Experiments:

BEPC-BES

View in:

pdf

reference search13 citations

Citations per year

Abstract: (arXiv)

Based on a sample of

58\times10^6J/\psi

decays collected with the BESII detector at the BEPC, the

\bar\Lambda

decay parameter

\alpha_{\bar\Lambda}

for

\bar\Lambda\to \bar p \pi^+

is measured using about 9000

J/\psi\to\Lambda\bar\Lambda\to p \bar p \pi^+\pi^-

decays. A fit to the joint angular distributions yields

\alpha_{\bar\Lambda}(\bar\Lambda\to \bar p\pi^+)=-0.755\pm0.083\pm0.063

, where the first error is statistical, and the second systematic.

Note:

9 pages, 5 figures, 2 tables

11.30.Er
14.20.Jn
13.20.Gd
13.25.Gv
electron positron: annihilation
J/psi(3100): hadronic decay
Lambda: pair production
helicity: correlation
Antilambda: hadronic decay
angular distribution

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Figures(9)

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Measurement of the asymmetry parameter for the decay Λˉ→pˉπ+\bar\Lambda \to \bar p\pi^+Λˉ→pˉ​π+

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Measurement of the asymmetry parameter for the decay $\bar\Lambda \to \bar p\pi^+$