1,725,013 research outputs found
Paolo Bizzeti, Il libro délia Sapienza. Struttura e genere letterario (coll. Supplementi alla Rivista Biblica, 11), 1984
No full textVermeylen Jacques. Paolo Bizzeti, Il libro délia Sapienza. Struttura e genere letterario (coll. Supplementi alla Rivista Biblica, 11), 1984. In: Revue théologique de Louvain, 21ᵉ année, fasc. 4, 1990. p. 493
Recent results from the NA62 and NA48/2 experiments at CERN
No full textA measurement of the K+→π0e+νγ radiative decay and a search for the K+→π−(π0)e+e+ lepton number violating decays by the NA62 experiment are presented, together with the first observation and branching fraction measurement of the rare decay K+→π0π0μ+ν by the NA48/2 experiment
The NA62 RICH detector
No full textThe RICH detector of the NA62 experiment at CERN SPS is required to suppress contamination in candidate events by a factor at least 100 between 15 and 35 GeV/c momentum, to measure the pion arrival time with ps resolution and to produce a trigger for a charged track. It consists of a 17 m long tank filled with Neon gas at atmospheric pressure. \v{C}erenkov light is reflected by a mosaic of 20 spherical mirrors placed at the downstream end of the vessel and is collected by 1952 photomultipliers placed at the upstream end. The construction of the detector will be described and the performance reached during first runs will be discussed.The RICH detector of the NA62 experiment at CERN SPS is required to suppress contamination in candidate events by a factor at least 100 between 15 and 35 GeV/c momentum, to measure the pion arrival time with ps resolution and to produce a trigger for a charged track. It consists of a 17 m long tank filled with Neon gas at atmospheric pressure. Čerenkov light is reflected by a mosaic of 20 spherical mirrors placed at the downstream end of the vessel and is collected by 1952 photomultipliers placed at the upstream end. The construction of the detector will be described and the performance reached during first runs will be discussed
Kaon decays at NA48: Recent results and perspectives
No full textWe report recent results on charged kaon rare decays obtained by the NA48/2 collaboration. The Ke4 decays K± →p+p-e±n(Ke4(+-)) and K± →p0p0e±n(Ke4(00)) have been studied extensively, providing measurements of the branching ratios, together with the Ke4(+-) form factors and a precise determination of pp scattering lengths. Prospects for a study of Kμ4 decays are discussed. A new measurement of the branching ratio and gg invariant mass spectrum of K± → p±gg decays has been obtained from a combined analysis of NA48/2 and NA62 minimum-bias data. The analysis of a high statistics and low background sample of K± →p±p0g decays provided the first evidence of a non-zero interference between Inner Bremsstrahlung and Direct Emission amplitudes. The K± →p±p0e+e- decay has been observed for the first time, with a statistics of about 4500 events. The branching ratios of K± →p±e+e- and K± →p±μ+μ- decays have been measured with a few percent precision. Improved upper limits are given for CP-violating asymmetries in these decays, and for the branching fraction of the Lepton Number violating decay K± →πμ±μ±
Recent results and prospects from NA62
Get PDFA large sample of charged kaon decays in 2007 has been collected by the NA62 experiment at CERN SPS using the experimental setup of the former NA48 experiment. Its intense kaon beam provides an abundant source of tagged neutral pions in vacuum. A measurement of the electromagnetic transition form factor slope of the neutral pion from 1:05 × 106 fully reconstructed π0 Dalitz decays is presented. The obtained preliminary value a = (3.70 ± 0.53stat ± 0.36syst) × 10−2 is the first 5.8σ observation of a non-zero slope in the time-like region of momentum transfer.
K+ → π+ vv̄ is a theoretically very clean decay where indirect effects of new physics may be detectable. The NA62 apparatus has been significantly upgraded between 2008 and 2014 in order to measure the branching ratio of this decay with 10% precision. The NA62 experiment took data with the new setup in pilot runs in 2014 and 2015, reaching the design beam intensity. Results of first data quality studies in view of the 2016-2017 physics runs are presented
Precision measurement of the form factors of the charged kaon semileptonic decays by the NA48/2 experiment at CERN
Get PDFThe final result on the charged kaon semileptonic form factors from the NA48/2 experiment is presented. The measurement is based on 4.28 million and 2.91 million events collected in 2004 with very low background ( and , respectively). The joint analysis of these samples provides the most precise combined measurement of form factors
Going Beyond Counting First Authors in Author Co-citation Analysis
Get PDFThe present study examines one of the fundamental aspects of author co-citation analysis (ACA) - the way co-citation
counts are defined. Co-citation counting provides the data on which all subsequent statistical analyses and mappings
are based, and we compare ACA results based on two different types of co-citation counting - the traditional type that
only counts the first one among a cited work's authors on the one hand and a non-traditional type that takes into
account the first 5 authors of a cited work on the other hand. Results indicate that the picture produced through this non-traditional author co-citation counting contains more coherent author groups and is therefore considerably clearer. However, this picture represents fewer specialties in the research field being studied than that produced through the traditional first-author co-citation counting when the same number of top-ranked authors is selected and analyzed. Reasons for these effects are discussed
Observation of CP Violation in Charm Decays
Get PDFA search for charge-parity (CP) violation in D0→K-K+ and D0→π-π+ decays is reported, using pp collision data corresponding to an integrated luminosity of 5.9 fb-1 collected at a center-of-mass energy of 13 TeV with the LHCb detector. The flavor of the charm meson is inferred from the charge of the pion in D∗(2010)+→D0π+ decays or from the charge of the muon in B̄→D0μ-ν̄μX decays. The difference between the CP asymmetries in D0→K-K+ and D0→π-π+ decays is measured to be ΔACP=[-18.2±3.2(stat)±0.9(syst)]×10-4 for π-tagged and ΔACP=[-9±8(stat)±5(syst)]×10-4 for μ-tagged D0 mesons. Combining these with previous LHCb results leads to ΔACP=(-15.4±2.9)×10-4, where the uncertainty includes both statistical and systematic contributions. The measured value differs from zero by more than 5 standard deviations. This is the first observation of CP violation in the decay of charm hadrons
Precision measurements of ππ scattering lengths at NA48/2
No full textLow energy ππ scattering has been studied with high precision by the NA48/2 experiment at the CERN SPS using large data samples of K ±→π±π0π 0 and K±→π+π -e±ν(Ke4) decays. The π0π0 invariant mass distribution in the K ±→π±π0π 0 decay exhibits a Wigner cusp at the π+π - threshold, from which the scattering lengths a0 and a2 are extracted. The measurement of a0 and a2 is also performed from Ke4 decay, with similar precision. The combination of these measurement provides a stringent test of Chiral Perturbation Theory. © 2011 American Institute of Physics
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