Publications (145) View all
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Article: The large-angle photon veto system for the NA62 experiment at the CERN SPS
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ABSTRACT: The branching ratio (BR) for the decay K^+ \to \pi^+\nu\bar{\nu} is a sensitive probe for new physics. The NA62 experiment at the CERN SPS will measure this BR to within about 10%. To reject the background from dominant kaon decays with final state photons, the large-angle photon vetoes (LAVs) must detect photons of energy as low as 200 MeV with an inefficiency of less than 10^{-4}. The LAV detectors make use of lead glass blocks recycled from the OPAL electromagnetic calorimeter barrel. We describe the mechanical design and challenges faced during construction, the characterization of the lead glass blocks and solutions adopted for monitoring their performance, and the development of front-end electronics to allow simultaneous time and energy measurements over an extended dynamic range using the time over-threshold technique. Our results are based on test-beam data and are reproduced by a detailed Monte Carlo simulation that includes the readout chain.07/2012; -
Article: Erratum to: Precise measurement of Γ(K→eν(γ))/Γ(K→μν(γ)) and study of K→eνγ
European Physical Journal C 05/2012; 65(3):703-703. · 3.63 Impact Factor -
Article: A study of the radiative KL→π±e∓νγ decay and search for direct photon emission with the KLOE detector
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ABSTRACT: We present a measurement of the ratio R=Γ(K0 e3γ;E* γ > 30MeV, θ* γ>20°)/Γ(K0 e3) and a first measurement of the direct emission contribution in semileptonic KL decays. The measurement was performed at the DA NE φ factory by selecting φ→KLKS decays with the KLOE detector. We use 328pb-1 of data, corresponding to about 3.5 million K0 e3 events and about 9000 K0 e3γ radiative events. Our result is R=(924±23stat±16syst)×10-5 for the branching ratio and 〈X〉=-2.3±1.3stat±1.4syst for the effective strength parameter describing direct emission.European Physical Journal C 04/2012; 55(4):539-546. · 3.63 Impact Factor -
Article: Precise measurement of Γ(KS→π+π-(γ))/Γ(KS→π0π0) with the KLOE detector at DAΦNE
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ABSTRACT: Using a sample of over 400 million φ→KSKL decays produced during the years 2001 and 2002 at the DAΦNE e+e- collider, the ratio RS π=Γ(KS→π+π-(γ))/Γ(KS→π0π0) has been measured with the KLOE detector. The result is RS π=2.2555±0.0012stat±0.0021corr-stat±0.0050syst, which is in good agreement with the previously published result based on the KLOE data sample from the year 2000. The average of the KLOE results is RS π=2.2549±0.0054, reducing the total error by a factor of three, to 0.25%.European Physical Journal C 04/2012; 48(3):767-780. · 3.63 Impact Factor -
Article: Precision measurement of the KS meson lifetime with the KLOE detector
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ABSTRACT: Using a large sample of pure, slow, short lived K 0 mesons collected with KLOE detector at DAΦNE, we have measured the K S lifetime. From a fit to the proper time distribution we find τ(K S )=(89.562±0.029stat±0.043syst)ps. This is the most precise measurement to date of the short lived K 0 meson lifetime, in good agreement with the world average derived from previous measurements. We observe no dependence of the lifetime on the direction of the K S in galactic coordinates.European Physical Journal C 04/2012; 71(3):1-6. · 3.63 Impact Factor
