UCL Discovery
UCL home » Library Services » Electronic resources » UCL Discovery

Study of J/psi -> p(p)over-bar,Lambda(Lambda)over-bar and observation of eta(c)->Lambda(Lambda)over-bar at Belle

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. Green open access

[thumbnail of 1308524.pdf]
Preview
PDF
1308524.pdf

Download (200kB)

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
Downloads since deposit
47Downloads
Download activity - last month
Download activity - last 12 months
Downloads by country - last 12 months

Archive Staff Only

View Item View Item