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Search Results: 1 - 10 of 144416 matches for " F. Budano "
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A new limit on the CP violating decay KS -> 3pi0 with the KLOE experiment
D. Babusci,D. Badoni,I. Balwierz-Pytko,G. Bencivenni,C. Bini,C. Bloise,F. Bossi,P. Branchini,A. Budano,L. Caldeira Balkestahl,G. Capon,F. Ceradini,P. Ciambrone,F. Curciarello,E. Czerwinski,E. Dane,V. De Leo,E. De Lucia,G. De Robertis,A. De Santis,A. Di Domenico,C. Di Donato,R. Di Salvo,D. Domenici,O. Erriquez,G. Fanizzi,A. Fantini,G. Felici,S. Fiore,P. Franzini,P. Gauzzi,G. Giardina,S. Giovannella,F. Gonnella,E. Graziani,F. Happacher,L. Heijkenskjold,B. Hoistad,L. Iafolla,M. Jacewicz,T. Johansson,K. Kacprzak,A. Kupsc,J. Lee-Franzini,B. Leverington,F. Loddo,S. Loffredo,G. Mandaglio,M. Martemianov,M. Martini,M. Mascolo,R. Messi,S. Miscetti,G. Morello,D. Moricciani,P. Moskal,F. Nguyen,A. Passeri,V. Patera,I. Prado Longhi,A. Ranieri,C. F. Redmer,P. Santangelo,I. Sarra,M. Schioppa,B. Sciascia,M. Silarski,C. Taccini,L. Tortora,G. Venanzoni,W. Wislicki,M. Wolke,J. Zdebik
Physics , 2013, DOI: 10.1016/j.physletb.2013.05.008
Abstract: We have carried out a new direct search for the CP violating decay KS -> 3pi0 with 1.7 fb^-1 of e+e- collisions collected by the KLOE detector at the phi-factory DAFNE. We have searched for this decay in a sample of about 5.9 x 10^8 KS KL events tagging the KS by means of the KL interaction in the calorimeter and requiring six prompt photons. With respect to our previous search, the analysis has been improved by increasing of a factor four the tagged sample and by a more effective background rejection of fake KS tags and spurious clusters. We find no candidates in data and simulated background samples, while we expect 0.12 standard model events. Normalizing to the number of KS -> 2pi0 events in the same sample, we set the upper limit on BR(KS -> 3pi0 < 2.6 x 10^-8 at 90% C.L., five times lower than the previous limit. We also set the upper limit on the eta_000 parameter, |eta_000 | < 0.0088 at 90% C.L., improving by a factor two the latest direct measurement.
U boson searches at KLOE
F. Archilli,D. Babusci,D. Badoni,I. Balwierz,G. Bencivenni,C. Bini,C. Bloise,V. Bocci,F. Bossi,P. Branchini,A. Budano,S. A. Bulychjev,P. Campana,G. Capon,F. Ceradini,P. Ciambrone,E. Czerwinski,E. Dane',E. De Lucia,G. De Robertis,A. De Santis,G. De Zorzi,A. Di Domenico,C. Di Donato,D. Domenici,O. Erriquez,G. Fanizzi,G. Felici,S. Fiore,P. Franzini,P. Gauzzi,S. Giovannella,F. Gonnella,E. Graziani,F. Happacher,B. Hoistad,E. Iarocci,M. Jacewicz,T. Johansson,V. Kulikov,A. Kupsc,J. Lee-Franzini,F. Loddo,M. Martemianov,M. Martini,M. Matsyuk,R. Messi,S. Miscetti,G. Morello,D. Moricciani,P. Moskal,F. Nguyen,A. Passeri,V. Patera,I. Prado Longhi,A. Ranieri,P. Santangelo,I. Sarra,M. Schioppa,B. Sciascia,A. Sciubba,M. Silarski,C. Taccini,L. Tortora,G. Venanzoni,R. Versaci,W. Wislicki,M. Wolke,J. Zdebik
Physics , 2011, DOI: 10.1088/1742-6596/335/1/012067
Abstract: The existence of a secluded gauge sector could explain several puzzling astrophysical observations. This hypothesis can be tested at low energy e+e- colliders such as DAPHNE. Preliminary results obtained with KLOE data and perpectives for the KLOE-2 run, where a larger data sample is expected, are discussed.
$γγ$ physics with the KLOE experiment
The KLOE-2 Collaboration,F. Archilli,D. Babusci,D. Badoni,I. Balwierz,G. Bencivenni,C. Bini,C. Bloise,V. Bocci,F. Bossi,P. Branchini,A. Budano,S. A. Bulychjev,P. Campana,G. Capon,F. Ceradini,P. Ciambrone,E. Czerwinski,E. Dane,E. De Lucia,G. De Robertis,A. De Santis,G. De Zorzi,A. Di Domenico,C. Di Donato,D. Domenici,O. Erriquez,G. Fanizzi,G. Felici,S. Fiore,P. Franzini,P. Gauzzi,S. Giovannella,F. Gonnella,E. Graziani,F. Happacher,B. Hoistad,E. Iarocci,M. Jacewicz,T. Johansson,V. Kulikov,A. Kupsc,J. Lee-Franzini,F. Loddo,M. Martemianov,M. Martini,M. Matsyuk,R. Messi,S. Miscetti,G. Morello,D. Moricciani,P. Moskal,F. Nguyen,A. Passeri,V. Patera,I. Prado Longhi,A. Ranieri,P. Santangelo,I. Sarra,M. Schioppa,B. Sciascia,A. Sciubba,M. Silarski,C. Taccini,L. Tortora,G. Venanzoni,R. Versaci,W. Wislicki,M. Wolke,J. Zdebik
Physics , 2011,
Abstract: The processes $e^+e^-\to e^+e^-X$, with $X$ being either the $\eta$ meson or $\pi^0\pi^0$, are studied at DA$\Phi$NE, with $e^+e^-$ beams colliding at $\sqrt{s}\simeq1$ GeV, below the $\phi$ resonance peak. The data sample is from an integrated luminosity of 240 pb$^{-1}$, collected by the KLOE experiment without tagging of the outgoing $e^+e^-$. Preliminary results are presented on the observation of the $\gamma\gamma\to\eta$ process, with both $\eta\to\pi^+\pi^-\pi^0$ and $\eta\to\pi^0\pi^0\pi^0$ channels, and the evidence for $\gamma\gamma\to\pi^0\pi^0$ production at low $\pi^0\pi^0$ invariant mass.
Recent results on hadron physics at KLOE
D. Babusci,D. Badoni,I. Balwierz-Pytko,G. Bencivenni,C. Bini,C. Bloise,F. Bossi,P. Branchini,A. Budano,L. Caldeira Balkest,G. Capon,F. Ceradini,P. Ciambrone,F. Curciarello,E. Czerwinski,E. Dane,V. De Leo,E. De Lucia,G. De Robertis,A. De Santis,A. Di Domenico,C. Di Donato,R. Di Salvo,D. Domenici,O. Erriquez,G. Fanizzi,A. Fantini,G. Felici,S. Fiore,P. Franzini,A. Gajos,P. Gauzzi,G. Giardina,S. Giovannella,E. Graziani,F. Happacher,L. Heijkenskjold,B. Hoistad,L. Iafolla,M. Jacewicz,T. Johansson,K. Kacprzak,A. Kupsc,J. Lee-Franzini,B. Leverington,F. Loddo,S. Loffredo,G. Mandaglio,M. Martemianov,M. Martini,M. Mascolo,R. Messi,S. Miscetti,G. Morello,D. Moricciani,P. Moskal,F. Nguyen,A. Palladino,A. Passeri,V. Patera,I. Prado Longhi,A. Ranieri,C. F. Redmer,P. Santangelo,I. Sarra,M. Schioppa,B. Sciascia,M. Silarski,C. Taccini,L. Tortora,G. Venanzoni,W. Wislicki,M. Wolke,J. Zdebik
Physics , 2013,
Abstract: One of the basic motivations of the KLOE and KLOE-2 collaborations is the test of fundamental symmetries and the search for phenomena beyond the Standard Model via the hadronic and leptonic decays of ground-state mesons and via their production in the fusion of virtual gamma quanta exchanged between colliding electrons and positrons. This contribution includes brief description of results of recent analysis of the KLOE data aimed at (i) the search for the dark matter boson, (ii) determination of the hadronic and light-by-light contributions to the g-2 muon anomaly and (iii) tests of QCD anomalies.
Measurement of η meson production in γγ interactions and Γ(η-->γγ) with the KLOE detector
KLOE-2 Collaboration,:,D. Babusci,D. Badoni,I. Balwierz-Pytko,G. Bencivenni,C. Bini,C. Bloise,F. Bossi,P. Branchini,A. Budano,L. Caldeira Balkestaahl,G. Capon,F. Ceradini,P. Ciambrone,E. Czerwinski,E. Dane,E. De Lucia,G. De Robertis,A. De Santis,A. Di Domenico,C. Di Donato,R. Di Salvo,D. Domenici,O. Erriquez,G. Fanizzi,A. Fantini,G. Felici,S. Fiore,P. Franzini,P. Gauzzi,G. Giardina,S. Giovannella,F. Gonnella,E. Graziani,F. Happacher,L. Heijkenskj,B. Hoistad,L. Iafolla,M. Jacewicz,T. Johansson,A. Kupsc,J. Lee-Franzini,B. Leverington,F. Loddo,S. Loffredo,G. Mandaglio,M. Martemianov,M. Martini,M. Mascolo,R. Messi,S. Miscetti,G. Morello,D. Moricciani,P. Moskal,F. Nguyen,A. Passeri,V. Patera,I. Prado Longhi,A. Ranieri,C. F. Redmer,P. Santangelo,I. Sarra,M. Schioppa,B. Sciascia,M. Silarski,C. Taccini,L. Tortora,G. Venanzoni,W. Wislicki,M. Wolke,J. Zdebik
Physics , 2012, DOI: 10.1007/JHEP01(2013)119
Abstract: We present a measurement of {\eta} meson production in photon-photon interactions produced by electron-positron beams colliding with \sqrt{s}=1 GeV. The measurement is done with the KLOE detector at the \phi-factory DA{\Phi}NE with an integrated luminosity of 0.24 fb^{-1}. The e^+e^- --> e^+e^-{\eta} cross section is measured without detecting the outgoing electron and positron, selecting the decays {\eta}-->{\pi}^+{\pi}^-{\pi}^0 and {\eta}-->{\pi}^0{\pi}^0{\pi}^0. The most relevant background is due to e^+e^- --> {\eta}{\gamma} when the monochromatic photon escapes detection. The cross section for this process is measured as {\sigma}(e^+e^- -->{\eta}{\gamma}) = (856 \pm 8_{stat} \pm 16_{syst}) pb. The combined result for the e^+e^- -->e^+e^-{\eta} cross section is {\sigma}(e^+e^- -->e^+e^-{\eta}) = (32.72 \pm 1.27_{stat} \pm 0.70_{syst}) pb. From this we derive the partial width {\Gamma}({\eta}-->{\gamma}{\gamma}) = (520 \pm 20_{stat} \pm 13_{syst}) eV. This is in agreement with the world average and is the most precise measurement to date.
Measurement of Γ(η-> π^+π^-γ)/Γ(η-> π^+π^-π^0) with the KLOE Detector
D. Babusci,D. Badoni,I. Balwierz-Pytko,G. Bencivenni,C. Bini,C. Bloise,V. Bocci,F. Bossi,P. Branchini,A. Budano,L. Caldeira Balkest,G. Capon,F. Ceradini,P. Ciambrone,E. Czerwinski,E. Dane,E. De Lucia,G. De Robertis,A. De Santis,P. De Simone,A. Di Domenico,C. Di Donato,B. Di Micco,R. Di Salvo,D. Domenici,O. Erriquez,G. Fanizzi,A. Fantini,G. Felici,S. Fiore,P. Franzini,P. Gauzzi,G. Giardina,S. Giovannella,F. Gonnella,E. Graziani,F. Happacher,B. Hoistad,L. Iafolla,M. Jacewicz,T. Johansson,A. Kupsc,J. Lee-Franzini,B. Leverington,F. Loddo,S. Loffredo,G. Mandaglio,M. Martemianov,M. Martini,M. Mascolo,R. Messi,S. Miscetti,G. Morello,D. Moricciani,P. Moskal,F. Nguyen,A. Passeri,V. Patera,I. Prado Longhi,A. Ranieri,C. F. Redmer,P. Santangelo,I. Sarra,M. Schioppa,B. Sciascia,M. Silarski,C. Taccini,L. Tortora,G. Venanzoni,R. Versaci,W. Wislicki,M. Wolke,G. Xu,J. Zdebik
Physics , 2012, DOI: 10.1016/j.physletb.2012.11.032
Abstract: The ratio R_{\eta}=\Gamma(\eta -> \pi^+\pi^-\gamma)/\Gamma(\eta -> \pi^+\pi^-\pi^0) has been measured by analyzing 22 million \phi \to \eta \gamma decays collected by the KLOE experiment at DA\PhiNE, corresponding to an integrated luminosity of 558 pb^{-1}. The \eta \to \pi^+\pi^-\gamma proceeds both via the \rho resonant contribution, and possibly a non-resonant direct term, connected to the box anomaly. Our result, R_{\eta}= 0.1856\pm 0.0005_{stat} \pm 0.0028_{syst}, points out a sizable contribution of the direct term to the total width. The di-pion invariant mass for the \eta -> \pi^+\pi^-\gamma decay could be described in a model-independent approach in terms of a single free parameter, \alpha. The determined value of the parameter \alpha is \alpha = (1.32 \pm 0.08_{stat} +0.10/-0.09_{syst}\pm 0.02_{theo}) GeV^{-2}
Limit on the production of a light vector gauge boson in phi meson decays with the KLOE detector
KLOE-2 Collaboration,:,D. Babusci,D. Badoni,I. Balwierz-Pytko,G. Bencivenni,C. Bini,C. Bloise,F. Bossi,P. Branchini,A. Budano,L. Caldeira Balkestaahl,G. Capon,F. Ceradini,P. Ciambrone,E. Czerwinski,E. Dane,E. De Lucia,G. De Robertis,A. De Santis,A. Di Domenico,C. Di Donato,R. Di Salvo,D. Domenici,O. Erriquez,G. Fanizzi,A. Fantini,G. Felici,S. Fiore,P. Franzini,P. Gauzzi,G. Giardina,S. Giovannella,F. Gonnella,E. Graziani,F. Happacher,L. Heijkenskj,B. Hoistad,L. Iafolla,M. Jacewicz,T. Johansson,A. Kupsc,J. Lee-Franzini,B. Leverington,F. Loddo,S. Loffredo,G. Mandaglio,M. Martemianov,M. Martini,M. Mascolo,R. Messi,S. Miscetti,G. Morello,D. Moricciani,P. Moskal,F. Nguyen,A. Passeri,V. Patera,I. Prado Longhi,A. Ranieri,C. F. Redmer,P. Santangelo,I. Sarra,M. Schioppa,B. Sciascia,M. Silarski,C. Taccini,L. Tortora,G. Venanzoni,W. Wislicki,M. Wolke,J. Zdebik
Physics , 2012, DOI: 10.1016/j.physletb.2013.01.067
Abstract: We present a new limit on the production of a light dark-force mediator with the KLOE detector at DAPHNE. This boson, called U, has been searched for in the decay phi --> eta U, U --> e+ e-, analyzing the decay eta --> pi0 pi0 pi0 in a data sample of 1.7 fb-1. No structures are observed in the e+e- invariant mass distribution over the background. This search is combined with a previous result obtained from the decay eta --> pi+ pi- pi0, increasing the sensitivity. We set an upper limit at 90% C.L. on the ratio between the U boson coupling constant and the fine structure constant of alpha'/alpha < 1.7x10^-5 for 30
Test of CPT and Lorentz symmetry in entangled neutral kaons with the KLOE experiment
KLOE-2 Collaboration,:,D. Babusci,I. Balwierz-Pytko,G. Bencivenni,C. Bloise,F. Bossi,P. Branchini,A. Budano,L. Caldeira Balkestahl,G. Capon,F. Ceradini,P. Ciambrone,F. Curciarello,E. Czerwinski,E. Danè,V. De Leo,E. De Lucia,G. De Robertis,A. De Santis,P. De Simone,A. Di Cicco,A. Di Domenico,C. Di Donato,R. Di Salvo,D. Domenici,O. Erriquez,G. Fanizzi,A. Fantini,G. Felici,S. Fiore,P. Franzini,A. Gajos,P. Gauzzi,G. Giardina,S. Giovannella,E. Graziani,F. Happacher,L. Heijkenskjold,B. Hoistad,M. Jacewicz,T. Johansson,K. Kacprzak,D. Kaminska,A. Kupsc,J. Lee-Franzini,F. Loddo,S. Loffredo,G. Mandaglio,M. Martemianov,M. Martini,M. Mascolo,R. Messi,S. Miscetti,G. Morello,D. Moricciani,P. Moskal,F. Nguyen,A. Palladino,A. Passeri,V. Patera,I. Prado Longhi,A. Ranieri,P. Santangelo,I. Sarra,M. Schioppa,B. Sciascia,M. Silarski,C. Taccini,L. Tortora,G. Venanzoni,W. Wislicki,M. Wolke,J. Zdebik
Physics , 2013, DOI: 10.1016/j.physletb.2014.01.026
Abstract: Neutral kaon pairs produced in phi decays in anti-symmetric entangled state can be exploited to search for violation of CPT symmetry and Lorentz invariance. We present an analysis of the CP-violating process phi->K_S K_L->pi+pi-pi+pi- based on 1.7 fb-1 of data collected by the KLOE experiment at the Frascati phi-factory DAFNE. The data are used to perform a measurement of the CPT-violating parameters Delta_amu for neutral kaons in the contest of the Standard Model Extension framework. The parameters measured in the reference frame of the fixed stars are: Delta_ao = (-6.0 +- 7.7_{stat} +- 3.1_{syst}) x 10^{-18} GeV Delta_ax = ( 0.9 +- 1.5_{stat} +- 0.6_{syst}) x 10^{-18} GeV Delta_ay = (-2.0 +- 1.5_{stat} +- 0.5_{syst}) x 10^{-18} GeV Delta_az = ( 3.1 +- 1.7_{stat} +- 0.5_{syst}) x 10^{-18} GeV These are presently the most precise measurements in the quark sector of the Standard Model Extension.
Search for light vector boson production in $e^+e^- \rightarrow μ^+ μ^- γ$ interactions with the KLOE experiment
D. Babusci,I. Balwierz-Pytko,G. Bencivenni,C. Bloise,F. Bossi,P. Branchini,A. Budano,L. Caldeira Balkest?hl,F. Ceradini,P. Ciambrone,F. Curciarello,E. Czerwinski,E. Danè,V. De Leo,E. De Lucia,G. De Robertis,A. De Santis,P. De Simone,A. Di Cicco,A. Di Domenico,R. Di Salvo,D. Domenici,O. Erriquez,G. Fanizzi,A. Fantini,G. Felici,S. Fiore,P. Franzini,A. Gajos,P. Gauzzi,G. Giardina,S. Giovannella,E. Graziani,F. Happacher,L. Heijkenskjold,B. Hoistad,T. Johansson,K. Kacprzak,D. Kaminska,W. Krzemien,A. Kupsc,J. Lee-Franzini,F. Loddo,S. Loffredo,G. Mandaglio,M. Martemianov,M. Martini,M. Mascolo,R. Messi,S. Miscetti,G. Morello,D. Moricciani,P. Moskal,F. Nguyen,A. Palladino,A. Passeri,V. Patera,I. Prado Longhi,A. Ranieri,P. Santangelo,I. Sarra,M. Schioppa,B. Sciascia,M. Silarski,L. Tortora,G. Venanzoni,W. Wislicki,M. Wolke,J. Zdebik
Physics , 2014, DOI: 10.1016/j.physletb.2014.08.005
Abstract: We have searched for a light vector boson $U$, the possible carrier of a "dark force", with the KLOE detector at the DA$\Phi$NE \epm\ collider, motivated by astrophysical evidence for the presence of dark matter in the universe. Using \epm\ collisions collected with an integrated luminosity of $239.3$~pb$^{-1}$, we look for a dimuon mass peak in the reaction \epm\to$\mu^+ \mu^-$\gam, corresponding to the decay $U\to\mu^+\mu^-$. We find no evidence for a $U$ vector boson signal. We set a 90\% CL upper limit for the mixing parameter squared between the photon and the $U$ boson of 1.6$\times$10$^{-5}$ to 8.6$\times$10$^{-7}$ for the mass region $520
Search for dark Higgsstrahlung in e+ e- -> mu+ mu- and missing energy events with the KLOE experiment
KLOE-2 Collaboration,:,D. Babusci,G. Bencivenni,C. Bloise,F. Bossi,P. Branchini,A. Budano,L. Caldeira Balkestahl,F. Ceradini,P. Ciambrone,F. Curciarello,E. Czerwinski,E. Dane',V. De Leo,E. De Lucia,A. De Santis,P. De Simone,A. Di Cicco,A. Di Domenico,R. Di Salvo,D. Domenici,A. Fantini,G. Felici,S. Fiore,A. Gajos,P. Gauzzi,G. Giardina,S. Giovannella,E. Graziani,F. Happacher,L. Heijkenskjold,W. Ikegami Andersson,T. Johansson,D. Kaminska,W. Krzemien,A. Kupsc,S. Loffredo,G. Mandaglio,M. Martini,M. Mascolo,R. Messi,S. Miscetti,G. Morello,D. Moricciani,P. Moskal,F. Nguyen,A. Palladino,A. Passeri,V. Patera,A. Ranieri,P. Santangelo,I. Sarra,M. Schioppa,M. Silarski,L. Tortora,G. Venanzoni,W. Wislicki,M. Wolke
Physics , 2015,
Abstract: We searched for evidence of a Higgsstrahlung process in a secluded sector, leading to a final state with a dark photon U and a dark Higgs boson h', with the KLOE detector at DAFNE. We investigated the case of h' lighter than U, with U decaying into a muon pair and h' producing a missing energy signature. We found no evidence of the process and set upper limits to its parameters in the range 2m_mu
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