ArcAdiA

Search for the K-S -> e(+)e(-) decay with the KLOE detector

2011-12-22T13:35:28Z

Search for the K-S -> e(+)e(-) decay with the KLOE detector Ambrosino, F.; Antonelli, A.; Antonelli, M.; Archilli, F.; Beltrame, R.; Bencivenni, G.; Bertolucci, S.; Bini, C.; Bloise, C.; Bocchetta, Simona Serena; Bossi, F.; Branchini, P.; Campana, P.; Capon, G.; Capriotti, D.; Capussela, T.; Ceradini, Filippo; Ciambrone, P.; Crucianelli, F.; De Lucia, E.; De Santis, A.; De Simone, P.; De Zorzi, G.; Denig, A.; Di Domenico, A.; Di Donato, C.; Di Micco, Biagio; Dreucci, M.; Felici, G.; Ferrer, M. L.; Fiore, S.; Franzini, P.; Gatti, C.; Gauzzi, P.; Giovannella, S.; Graziani, E.; Kluge, W.; Kulikov, V.; Lanfranchi, G.; Lee-Franzini, J.; Leone, D.; Martini, M.; Massarotti, P.; Meola, S.; Miscetti, S.; Moulson, M.; Mueller, S.; Murtas, F.; Napolitano, M.; Nguyen, Federico; Palutan, M.; Pasqualucci, E.; Passeri, A.; Patera, V.; Perfetto, F.; Santangelo, P.; Sciascia, B.; Sciubba, A.; Sibidanov, A.; Spadaro, T.; Testa, M.; Tortora, L.; Valente, P.; Venanzoni, G.; Versaci, R. 2009 Physics Letters B 672 203-208 We present the result of a direct search for the decay K-S -> e(+)e(-),obtained with a sample of e(+)e(-) -> phi -> KSKL events produced at DAphi NE, the Frascati phi-factory, for an integrated luminosity of 1.9fb(-1). The search has been performed using a pure K-S beam tagged bythe simultaneous detection of a K-L interaction in the calorimeter.Background rejection has been optimized by using both kinematic andparticle identification cuts. We find BR(KS -> e(+)e(-)) < 9 x 10(-9)at 90% CL, which improves by an order of magnitude on the previous bestlimit, (C) 2009 Elsevier B.V, All rights reserved.

Study of the a0(980) meson via the radiative decay phi -> eta pi0 gamma with the KLOE detector

2011-12-22T13:35:28Z

Study of the a0(980) meson via the radiative decay phi -> eta pi0 gamma with the KLOE detector Ambrosino, Fabio; Bacci, Cesare; Bocchetta, Simona Serena; Ceradini, Filippo; Di Micco, Biagio; Nguyen, Federico 2009-09 Physics Letters B 681 5-13 We have studied the phi-> a0(980) gamma process with the KLOE detector at the Frascati phi-factory DAFNE by detecting the phi -> eta pi0 gamma decays in the final states with η -> gamma gamma and eta -> pi+ pi- pi0. We have measured the branching ratios for both final states: Br(phi -> eta pi0 gamma) = (7.01 ± 0.10 ± 0.20)×10−5 and (7.12 ± 0.13 ± 0.22)×10−5, respectively. We have also extracted the a0(980) mass and its couplings to eta-pi0, K+K−, and to the φ-meson from the fit of the eta-pi0 invariant mass distributions using different phenomenological models.

Scalar mesons with the KLOE experiment

2011-12-22T13:35:28Z

Scalar mesons with the KLOE experiment Ambrosino, Fabio; Bacci, Cesare; Bocchetta, Simona Serena; Ceradini, Filippo; Di Micco, Biagio; Nguyen, Federico 2009-01 Nuclear Physics B Proceedings Supplements 186 290-293 New results concerning the scalar mesons f0(980) produced in the φ → ππγ decays, and the a0(980) scalar mesons in the φ → a0(980)γ → ηπ0γ decays, are presented.

Implications on the Unitarity Triangle from kaons, KLOE results

2011-12-22T13:35:28Z

Implications on the Unitarity Triangle from kaons, KLOE results Bocchetta, Simona Serena 2009-11 Il Nuovo Cimento C 32 193-196 We present the KLOE measurements on KS, KL, K± semileptonic decays from which we find |Vus| = 0.2237(13). From the KLOE measurement of BR(K+ → μ+ν) we obtain |Vus/Vud| = 0.2323(15). An overall fit gives |Vus| = 0.2249(10) and |Vud| = 0.97417(26), compatible with unitarity: 1 − (V2ud + V2us +V2ub) = (4 ± 7) × 10−4.

Calibration and performances of the KLOE calorimeter

2011-12-22T13:34:55Z

Calibration and performances of the KLOE calorimeter Ambrosino, F.; Antonelli, A.; Antonelli, M.; Archilli, F.; Bacci, Cesare; Beltrame, P.; Bencivenni, G.; Bertolucci, S.; Bini, C.; Bloise, C.; Bocchetta, Simona Serena; Bossi, F.; Branchini, Paolo; Campana, P.; Capon, G.; Capussela, T.; Ceradini, Filippo; Chi, S.; Chiefari, G.; Ciambrone, P.; Crucianelli, F.; De Lucia, E.; De Santis, A.; De Simone, P.; De Zorzi, G.; Denig, A.; Di Domenico, A.; Di Donato, C.; Di Micco, Biagio; Doria, A.; Dreucci, M.; Felici, G.; Ferrari, A.; Ferrer, M. L.; Fiore, S.; Forti, C.; Franzini, P.; Gatti, C.; Gauzzi, P.; Giovannella, S.; Gorini, E.; Graziani, E.; Kluge, W.; Kulikov, V.; Lacava, F.; Lanfranchi, G.; Lee-Franzini, J.; Leone, D.; Martini, M.; Massarotti, P.; Mei, W.; Meola, S.; Miscetti, S.; Moulson, M.; Mueller, S.; Murtas, F.; Napolitano, M.; Nguyen, Federico; Palutan, M.; Pasqualucci, E.; Passeri, Antonio; Patera, V.; Perfetto, F.; Primavera, M.; Santangelo, P.; Saracino, G.; Sciascia, B.; Sciubba, A.; Sibidanov, A.; Spadaro, T.; Testa, M.; Tortora, Ludovico; Valente, P.; Venanzoni, G.; Versaci, R.; Xu, G. 2009-01-01 Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment 598 239-243 The KLOE experiment uses a fine sampling lead-scintillating fibrecalorimeter to measure energy, time and position of neutral and charged particles. The overall detector consists of 88 modules organised in a barrel and two end-caps, for a total granularity of 2440 cells, read-out by photo-multipliers at both fibre ends. The chosen design of a high sampling fraction with the usage of thin lead layers and fast scintillating fibres allows to reach good efficiency for photonenergies down to few MeV, good energy resolution and excellent time resolution. The design, calibration and performances of the calorimeter on efficiency, time/position/energy resolution and particle identification is reviewed. The overall calorimeter impact on kaon tagging and on physics results is also presented.