Measurements of the rare decay K-L -> e(+)e(-)e(+)e(-)

Citation
A. Alavi-harati et al., Measurements of the rare decay K-L -> e(+)e(-)e(+)e(-), PHYS REV L, 86(24), 2001, pp. 5425-5429
Citations number
13
Language
INGLESE
art.tipo
Article
Categorie Soggetti
Physics
Journal title
PHYSICAL REVIEW LETTERS
ISSN journal
0031-9007 → ACNP
Volume
86
Issue
24
Year of publication
2001
Pages
5425 - 5429
Database
ISI
SICI code
0031-9007(20010611)86:24<5425:MOTRDK>2.0.ZU;2-F
Abstract
We observe 441 K-L --> e(+)e(-)e(+)e(-) candidate events with a background of 4.2 events and measure B(K-L --> e(+)e(-)e(+)e(-)) = [3.72 +/- 0.18(stat ) +/- 0.23(syst)] X 10(-8) in the KTeV/E799II experiment at Fermilab. Using the distribution of the angle between the planes of the e(+)e(-) pairs, we measure the CP parameters beta (CP) = -0.23 +/- 0.09(stat) +/- 0.02(syst) and gamma (CP) = -0.09 +/- 0.09(stat) +/- 0.02(syst). We also present the f irst detailed study of the e(+)e(-) invariant mass spectrum in this decay m ode.