Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2001
A double-level trigger system has been developed for the KLOE experiment. Custom electronics asse... more A double-level trigger system has been developed for the KLOE experiment. Custom electronics asserts a trigger in a 2 ms decision time. The decision is based on the combined information of the electromagnetic calorimeter and the drift chamber. The entire trigger system is continuously monitored, and data flowing from the trigger system have allowed both an efficient online monitoring of the detector and an online luminosity measurement. #
The MACRO underground detector at Gran Sasso has recorded about 30 million muon events in the per... more The MACRO underground detector at Gran Sasso has recorded about 30 million muon events in the period 1989-1995. We have analyzed these data to look for time variations and to study the pointing capabilities of the apparatus in the search for astrophysical point sources. We have observed a 3% seasonal variation of the high energy muon rate, due to atmospheric temperature variations, in agreement with theoretical predictions. We report also the detection of the moon shadowing effect with a statistical significance of 3.7 a. The results obtained straighten the possibility that a "muon astronomy" using underground experiments is possible.
A sample of 5.3× 107φ mesons, produced at the Frascati φ-factory DAΦNE, has been used by the KLOE... more A sample of 5.3× 107φ mesons, produced at the Frascati φ-factory DAΦNE, has been used by the KLOE Collaboration to study the φ radiative decays. The decays φ→ ηπ0γ and φ→ πoπoγ have been exploited to study the scalar mesons ao (980) and fo (980). Furthermore a new determination of the η− η′ mixing angle has been obtained from the measurement of the ratio of the decay rates of/gf→ η′ γ to φ→ ηγ.
In the fixed energy environment of the e + e − collider DAΦNE, KLOE can measure the cross section... more In the fixed energy environment of the e + e − collider DAΦNE, KLOE can measure the cross section of the process e + e − → hadrons as a function of the hadronic system energy using the radiative return method. At energies below 1 GeV, e + e − → ρ → π + π − is the dominating hadronic process. We report here on the status of the analysis of the process e + e − → π + π − γ. Some preliminary results on the invariant mass spectrum of the two pion system, obtained from the analysis of ∼ 22.6 pb −1 , are presented.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
The main aim of the KLOE experiment at DAFNE, the Frascati f-factory, is to study CP violation in... more The main aim of the KLOE experiment at DAFNE, the Frascati f-factory, is to study CP violation in the K 0 -% K 0 system. Requirements on shower detection are very stringent. An hermetic, lead-scintillating fiber sampling calorimeter has been chosen and built. A review of the methods used to calibrate and reconstruct energy and timing is reported in this paper. Emphasis is given to the calibration procedures developed using the 2.4 pb À1 collected in 1999. An energy resolution of 5:7%= ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi E=GeV p is achieved together with a linearity in energy response better than 1% above 50 MeV. A time resolution of $54 ps= ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi E=GeV p is also measured on samples of radiative Bhabha and F decays. #
... P R. Barbosa Marinho, I. Bediaga, G. Cernicchiaro, A. Franca Barbosa, J. Magnin, J. Marques d... more ... P R. Barbosa Marinho, I. Bediaga, G. Cernicchiaro, A. Franca Barbosa, J. Magnin, J. Marques de Miranda, A. Massafferri, A. Reis, R. Silva, S. Amato, P. Colrain, T. Da Silva, JR T. De Mello-Neto, L. De Paula, M. Gandelman, J H. Lopes, B. Marechal, D. Moraes, E. Polycarpo, Z ...
Inclusive jet cross sections are measured in photoproduction at HERA using the H1 detec-tor. The ... more Inclusive jet cross sections are measured in photoproduction at HERA using the H1 detec-tor. The data sample of e+p → e+ + jet + X events in the kinematic range of photon vir-tualities Q2 ≤ 1 GeV2 and photon-proton centre-of-mass energies 95 ≤ Wγp ≤ 285 GeV ...
The ϕ-meson leptonic widths, Γee and Γμμ, are obtained, respectively, from the e+ e− forward–back... more The ϕ-meson leptonic widths, Γee and Γμμ, are obtained, respectively, from the e+ e− forward–backward asymmetry and the μ+ μ− cross section around the ϕ-mass energy. We find Γee= 1.32±0.05±0.03 keV and ΓeeΓμμ= 1.320±0.018±0.017 keV. These results, compatible with Γee= Γμμ, provide a precise test of lepton universality. Combining the two results gives Γℓℓ (ϕ)= 1.320±0.023 keV.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2012
The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at the SIS accelerato... more The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at the SIS accelerator of GSI laboratory in Darmstadt has been designed for the measurement of ion fragmentation crosssections at different angles and energies between 100 and 1000 MeV/nucleon. Nuclear fragmentation processes are relevant in several fields of basic research and applied physics and are of particular interest for tumor therapy and for space radiation protection applications.
Nuclear Instruments & Methods in Physics Research Section a-Accelerators Spectrometers Detectors and Associated Equipment, 2001
A double-level trigger system has been developed for the KLOE experiment. Custom electronics asse... more A double-level trigger system has been developed for the KLOE experiment. Custom electronics asserts a trigger in a 2 ms decision time. The decision is based on the combined information of the electromagnetic calorimeter and the drift chamber. The entire trigger system is continuously monitored, and data flowing from the trigger system have allowed both an efficient online monitoring of the detector and an online luminosity measurement. #
The MACRO underground detector at Gran Sasso has recorded about 30 million muon events in the per... more The MACRO underground detector at Gran Sasso has recorded about 30 million muon events in the period 1989-1995. We have analyzed these data to look for time variations and to study the pointing capabilities of the apparatus in the search for astrophysical point sources. We have observed a 3% seasonal variation of the high energy muon rate, due to atmospheric temperature variations, in agreement with theoretical predictions. We report also the detection of the moon shadowing effect with a statistical significance of 3.7 a. The results obtained straighten the possibility that a "muon astronomy" using underground experiments is possible.
A sample of 5.3× 107φ mesons, produced at the Frascati φ-factory DAΦNE, has been used by the KLOE... more A sample of 5.3× 107φ mesons, produced at the Frascati φ-factory DAΦNE, has been used by the KLOE Collaboration to study the φ radiative decays. The decays φ→ ηπ0γ and φ→ πoπoγ have been exploited to study the scalar mesons ao (980) and fo (980). Furthermore a new determination of the η− η′ mixing angle has been obtained from the measurement of the ratio of the decay rates of/gf→ η′ γ to φ→ ηγ.
In the fixed energy environment of the e + e − collider DAΦNE, KLOE can measure the cross section... more In the fixed energy environment of the e + e − collider DAΦNE, KLOE can measure the cross section of the process e + e − → hadrons as a function of the hadronic system energy using the radiative return method. At energies below 1 GeV, e + e − → ρ → π + π − is the dominating hadronic process. We report here on the status of the analysis of the process e + e − → π + π − γ. Some preliminary results on the invariant mass spectrum of the two pion system, obtained from the analysis of ∼ 22.6 pb −1 , are presented.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2001
The main aim of the KLOE experiment at DAFNE, the Frascati f-factory, is to study CP violation in... more The main aim of the KLOE experiment at DAFNE, the Frascati f-factory, is to study CP violation in the K 0 -% K 0 system. Requirements on shower detection are very stringent. An hermetic, lead-scintillating fiber sampling calorimeter has been chosen and built. A review of the methods used to calibrate and reconstruct energy and timing is reported in this paper. Emphasis is given to the calibration procedures developed using the 2.4 pb À1 collected in 1999. An energy resolution of 5:7%= ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi E=GeV p is achieved together with a linearity in energy response better than 1% above 50 MeV. A time resolution of $54 ps= ffiffiffiffiffiffiffiffiffiffiffiffiffiffiffi ffi E=GeV p is also measured on samples of radiative Bhabha and F decays. #
... P R. Barbosa Marinho, I. Bediaga, G. Cernicchiaro, A. Franca Barbosa, J. Magnin, J. Marques d... more ... P R. Barbosa Marinho, I. Bediaga, G. Cernicchiaro, A. Franca Barbosa, J. Magnin, J. Marques de Miranda, A. Massafferri, A. Reis, R. Silva, S. Amato, P. Colrain, T. Da Silva, JR T. De Mello-Neto, L. De Paula, M. Gandelman, J H. Lopes, B. Marechal, D. Moraes, E. Polycarpo, Z ...
Inclusive jet cross sections are measured in photoproduction at HERA using the H1 detec-tor. The ... more Inclusive jet cross sections are measured in photoproduction at HERA using the H1 detec-tor. The data sample of e+p → e+ + jet + X events in the kinematic range of photon vir-tualities Q2 ≤ 1 GeV2 and photon-proton centre-of-mass energies 95 ≤ Wγp ≤ 285 GeV ...
The ϕ-meson leptonic widths, Γee and Γμμ, are obtained, respectively, from the e+ e− forward–back... more The ϕ-meson leptonic widths, Γee and Γμμ, are obtained, respectively, from the e+ e− forward–backward asymmetry and the μ+ μ− cross section around the ϕ-mass energy. We find Γee= 1.32±0.05±0.03 keV and ΓeeΓμμ= 1.320±0.018±0.017 keV. These results, compatible with Γee= Γμμ, provide a precise test of lepton universality. Combining the two results gives Γℓℓ (ϕ)= 1.320±0.023 keV.
Nuclear Instruments and Methods in Physics Research Section A: Accelerators, Spectrometers, Detectors and Associated Equipment, 2012
The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at the SIS accelerato... more The FIRST (Fragmentation of Ions Relevant for Space and Therapy) experiment at the SIS accelerator of GSI laboratory in Darmstadt has been designed for the measurement of ion fragmentation crosssections at different angles and energies between 100 and 1000 MeV/nucleon. Nuclear fragmentation processes are relevant in several fields of basic research and applied physics and are of particular interest for tumor therapy and for space radiation protection applications.
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