Upper limit on the eta -> pi+pi- branching ratio with the KLOE experiment

Abstract

We have searched with the KLOE detector for the P and CP violating decay eta -> pi^+pi^- in a sample of 1.55 x 10^7 eta's from the decay phi -> eta gamma of phi mesons produced in e+e- annihilations at DAFNE. No signal is found. We obtain the upper limit BR(eta -> pi^+pi^-) < 1.3 x 10^-5 at 90% confidence level.

8 pages, 3 figures

References in corpus (2)

• Big Bang Nucleosynthesis (in "The Review of Particle Properties" 2004)
• Data handling, reconstruction, and simulation for the KLOE experiment

Cited by in corpus (10)

• Precision tests of fundamental physics with $\eta$ and ${\eta }^{\prime }$ mesons
• Baryon mass splittings and strong CP violation in SU(3) Chiral Perturbation Theory
• Measurement of the branching ratio and search for a CP violating asymmetry in the eta -> pi+pi-e+e-(gamma) decay at KLOE
• Prospects for e+e- physics at Frascati between the phi and the psi
• The Physics of DAFNE and KLOE
• Search for the $CP$-violating strong decays $\eta \to {\pi }^{+}{\pi }^{-}$ and ${\eta }^{\prime }(958)\to {\pi }^{+}{\pi }^{-}$
• Search for CP and $P$ violating pseudoscalar decays into $\pi \pi$
• Tests of the fundamental symmetries in eta meson decays
• Status of KLOE-2
• Study of $\eta$-meson Decays at KLOE/KLOE-2