1,721,068 research outputs found
A precise new KLOE measurement of F? with ISR events and determination of ?? contribution to a? for [0.35,0.95] GeV2
No full textThe KLOE experiment at the DA?NE ?-factory has performed a new precise measurement of the pion form factor using Initial State Radiation events, with photons emitted at small polar angle. Results based on an integrated luminosity of 240 pb-1 and extraction of the ?? contribution to a? in the mass range [0.35,0.95] GeV2 are presented, the systematic uncertainty is reduced with respect to the published KLOE result
Precise measurement of (KS -> pi+ pi- (gamma))/(KS -> pi0 pi0) with the KLOE detector at DAFNE
No full textMeasurement of the ratio Gamma (K(L) ---> gamma gamma) / Gamma (K(L) ---> pi0 pi0 pi0) with the KLOE detector
No full textMeasurement of the branching fraction and charge asymmetry for the decay K(S)-->pi e nu with the KLOE detector
No full textMeasurement of Gamma (phi ---> eta-prime gamma) / Gamma (phi ---> eta gamma) and the pseudoscalar mixing angle
No full textMeasurement of the ratio Gamma (K(L) ---> gamma gamma) / Gamma (K(L) ---> pi0 pi0 pi0) with the KLOE detector
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MEASUREMENT OF THE RATIO GAMMA (K(L) ---> GAMMA GAMMA) / GAMMA (K(L) ---> PI0 PI0 PI0) WITH THE KLOE DETECTOR
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Study of the η â Ï+Ï-e+e-decay at KLOE
No full textThe KLOE experiment has concluded its data taking in March 2006, having acquired an integrated luminosity of 2.5 fb-1of e+e- collisions at the center of mass energy around the à ̧(1020) resonance. The complete data set includes a sample of 100 million η's produced through the radiative decay à ̧ ηÎ3 and tagged by means of the monochromatic recoil photon. This huge amount of data allows to perform the first test of CP violation in η decays through the study of the rare η Ï+Ï-e+e channel, measuring the asymmetry between the Ï+Ï-and the e+e-decay planes in the η rest frame (Ï). Being this process flavor conserving, such an observation will point to unexpected mechanism of CP violation, thus providing an hint of new physics beyond the Standard Model. A study of the η Ï+Ï-e+e-decay based on a data sample of 1.7 fb-1will be presented. Electrons and pions are identified using both the time of flight to the calorimeter and the momentum of each track. Cuts on track momenta and on photon conversion on the beam pipe allow to significantly reduce the background, with a final 20% contamination. The analysis efficiency for the signal is 8%, dominated by geometrical acceptance. The final sample of about 1600 signal events, 100 times larger than today best measurement, is used to measure both the η Ï+Ï-e+e-(Î3) branching fraction and the asymmetryÏ. © 2009 IOP Publishing Ltd
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