Wu, CH;
Wang, MZ;
Abe, K;
Adachi, I;
Aihara, H;
Aulchenko, V;
Aushev, T;
... Belle Collaboration; + view all
(2006)
Study of J/psi -> p(p)over-bar,Lambda(Lambda)over-bar and observation of eta(c)->Lambda(Lambda)over-bar at Belle.
PHYS REV LETT
, 97
(16)
, Article 162003. 10.1103/PhysRevLett.97.162003.
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Abstract
We study the baryonic charmonium decays of B mesons B+->eta K-c(+) and B+-> J/psi K+, where the eta(c) and J/psi subsequently decay into a pp or Lambda Lambda pair. We measure the J/psi -> pp and Lambda Lambda anisotropy parameters alpha(B)=-0.60 +/- 0.13 +/- 0.14 (pp), -0.44 +/- 0.51 +/- 0.31 (Lambda Lambda) and compare to results from e(+)e(-)-> J/psi formation experiments. We also report the first observation of eta(c)->Lambda Lambda. The measured branching fraction is B(eta(c)->Lambda Lambda)=(0.87(-0.21)(+0.24)(stat)(-0.14)(+0.09)(syst)+/- 0.27(PDG))x10(-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.
| Type: | Article |
|---|---|
| Title: | Study of J/psi -> p(p)over-bar,Lambda(Lambda)over-bar and observation of eta(c)->Lambda(Lambda)over-bar at Belle |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.97.162003 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.97.162003 |
| Language: | English |
| Additional information: | © 2006 The American Physical Society |
| Keywords: | J/PSI-DECAYS, FINAL-STATES, BARYON, SEARCH |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1308524 |
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