Study of J/psi to p anti-p, Lambda anti-Lambda and observation of eta(c) to Lambda anti-Lambda at Belle - INSPIRE

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Study of J/psi to p anti-p, Lambda anti-Lambda and observation of eta(c) to Lambda anti-Lambda at Belle

Belle

Collaboration

•

C.-H. Wu
(
- Taiwan, Natl. Taiwan U.
)

Jun, 2006

8 pages

Published in:

Phys.Rev.Lett. 97 (2006) 162003

e-Print:

hep-ex/0606022 [hep-ex]

DOI:

10.1103/PhysRevLett.97.162003

PDG:

{{\mathit \eta}_{{{c}}}{(1S)}}

\rightarrow

{{\mathit p}}{{\overline{\mathit p}}}

Report number:

BELLE-PREPRINT-2006-18,
KEK-PREPRINT-2006-15

Experiments:

KEK-BF-BELLE

View in:

ADS Abstract Service

reference search16 citations

Citations per year

Abstract:

We study the baryonic charmonium decays of B mesons, B+ to etac K+ and B+ to J/psi K+, where the etac and J/psi subsequently decay into a p pbar or Lambda Lambdabar pair. We measure the J/psi to p pbar, Lambda Lambdabar anisotropy parameters, alpha_B = -0.60 +- 0.13 +-0.14 (p pbar), -0.44 +- 0.51 +- 0.31 (Lambda Lambdabar) and compare to results from e+e- to J/psi formation experiments. We also report the first observation of etac to Lambda Lambdabar. The measured branching fraction is B(etac to Lambda Lambdabar) = (0.87 +0.24 -0.21(stat) +0.09 -0.14(syst) +- 0.27 (PDG)) x 10^-3. This study is based on a 357 fb^-1 data sample recorded on the Upsilon(4S) resonance with the Belle detector at the KEKB asymmetric-energy e+e- collider.

13.25.Gv
14.40.Gx
13.40.Hq
electron positron: colliding beams
electron positron: annihilation
Upsilon(10570): electroproduction
B: pair production
B: hadronic decay
J/psi(3100): hadronic decay
eta/c(2980): hadronic decay

References(24)

Figures(0)

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