The KLOE experiment has just collected 2.5 fb−1 of e + e − collisions at center of mass energy around the φ mass. Radiative decays are used to produce large statistical samples of light scala and pseudoscalar mesons. The analysis of the first 450 pb−1 is almost completed. For the scala sector we have investigated the properties of these particles by studying their invariant mass shapes or the event density in the Dalitz plot. With the same data set, the η mass and the ratio BR(φ → η′γ)/BR(φ → ηγ) have been measured. From this last quantity we extract the most precise determination of the η/η′ mixing angle, which is strictly related to the η′ gluon content.
Highlights on hadronic physics at KLOE
GORINI, Edoardo;PRIMAVERA, Margherita;VENTURA, Andrea;
2006-01-01
Abstract
The KLOE experiment has just collected 2.5 fb−1 of e + e − collisions at center of mass energy around the φ mass. Radiative decays are used to produce large statistical samples of light scala and pseudoscalar mesons. The analysis of the first 450 pb−1 is almost completed. For the scala sector we have investigated the properties of these particles by studying their invariant mass shapes or the event density in the Dalitz plot. With the same data set, the η mass and the ratio BR(φ → η′γ)/BR(φ → ηγ) have been measured. From this last quantity we extract the most precise determination of the η/η′ mixing angle, which is strictly related to the η′ gluon content.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
