Measurement of J/psi decays into Lambda anti-Lambda pi+ pi- - INSPIRE

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Measurement of J/psi decays into Lambda anti-Lambda pi+ pi-

BESII

Collaboration

•

M. Ablikim
(
- Beijing, Inst. High Energy Phys.
)

2012

9 pages

Published in:

Chin.Phys.C 36 (2012) 1031-1039

DOI:

10.1088/1674-1137/36/11/001

PDG:

{{\mathit J / \psi}{(1S)}}

\rightarrow

{{\mathit \Lambda}}{{\overline{\mathit \Lambda}}}{{\mathit \pi}^{+}}{{\mathit \pi}^{-}}

Experiments:

BEPC-BES

reference search12 citations

Citations per year

Abstract: (IOP)

Based on 58 million J/I- events collected by the BES II detector at the BEPC, J/I- -> barLambdaI (+)I (-') is observed for the first time. The branching fraction is measured to be Br(J/I- -> barLambdaI (+)I (-'))=(4.30+-0.13+-0.99)Oe10(-')(3), excluding the decays to intermediate states, namely J/I- -> (-')(+),J/I- -> L(1385)(-')(1385)(+), and J/I- -> L(1385)(+)(1385)(-'). The branching fractions for these intermediate resonance channe ls are measured to be: Br(J/I- -> (-')(+))=(0.90+-0.03+-0.18)Oe10(-')(3), Br(J/I- -> L(1385)(-')(1385)(+))=(1.23+-0.07+-0.30)Oe10(-')(3), and Br(J/I- -> L(1385)(+)(1385)(-'))=(1.50+-0.08+-0.38)Oe10(-')(3), respectively. The angular distribution is of the form propto(1+alphacos(2) ) with alpha = (0.35+-0.29+-0.06) for J/I- -> (-')(+), alpha = (-'0.54+-0.22+-0.10) for J/I- -> L(1385)(-')(1385)(+), and alpha = (-'0.35+-0.25+-0.06) for J/I- -> L(1385)(+)(1385)(-').

21.60.-n
25.40.Cm
28.75.Gz
baryonic decays
branching fraction
alpha distribution
Sigma(1385): branching ratio
Lambda: pair production
Xi
branching ratio: measured

References(13)

Figures(0)

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