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Sökning: WFRF:(Mandaglio G.)

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1.
  • Ferrario, M., et al. (författare)
  • IRIDE : Interdisciplinary research infrastructure based on dual electron linacs and lasers
  • 2014
  • Ingår i: Nuclear Instruments and Methods in Physics Research Section A : Accelerators, Spectrometers, Detectors and Associated Equipment. - 0168-9002 .- 1872-9576. ; 740, s. 138-146
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>This paper describes the scientific aims and potentials as well as the preliminary technical design of RUDE, an innovative tool for multi-disciplinary investigations in a wide field of scientific, technological and industrial applications. IRIDE will be a high intensity "particles factory", based on a combination of high duty cycle radio-frequency superconducting electron linacs and of high energy lasers. Conceived to provide unique research possibilities for particle physics, for condensed matter physics, chemistry and material science, for structural biology and industrial applications, IRIDE will open completely new research possibilities and advance our knowledge in many branches of science and technology. [RIDE is also supposed to be realized in subsequent stages of development depending on the assigned priorities.</p>
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2.
  • Archilli, F., et al. (författare)
  • Search for a vector gauge boson in phi meson decays with the KLOE detector KLOE-2 Collaboration
  • 2012
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 706:4-5, s. 251-255
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The existence of a light dark force mediator has been tested with the KLOE detector at DA Phi NE. This particle, called U. is searched for using the decay chain phi -&gt; eta U, eta -&gt; pi(+)pi(-)pi(0), U -&gt; e(+)e(-). No evidence is found in 1.5 fb(-1) of data. The resulting exclusion plot covers the mass range 5 &lt; M-U &lt; 470 MeV, setting an upper limit on the ratio between the U boson coupling constant and the One structure constant, alpha'/alpha, of &lt;= 2 x 10(-5) at 90% C.L. for 50 &lt; M-U &lt; 420 MeV.</p>
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3.
  • Babusci, D., et al. (författare)
  • Measurement of Γ(η→π+π-γ)/Γ(η→π+π-π0) with the KLOE detector
  • 2013
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 718:3, s. 910-914
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>The ratio Rη=Γ(η→π+π-γ)/Γ(η→π+π-π0) has been measured by analysing 22 million φ→ηγ decays collected by the KLOE experiment at DAΦNE, corresponding to an integrated luminosity of 558 pb-1. The η→π+π-γ proceeds both via the ρ resonant contribution, and possibly a non-resonant direct term, connected to the box anomaly. Our result, Rη=0.1856±0.0005stat±0.0028syst, points out a sizable contribution of the direct term to the total width. The di-pion invariant mass for the η→π+π-γ decay could be described in a model-independent approach in terms of a single free parameter, α. The determined value of the parameter α is α=(1.32±0.08stat-0.09syst+0.10±0.02theo) GeV-2.</p>
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4.
  • Babusci, D., et al. (författare)
  • Test of CPT and Lorentz symmetry in entangled neutral kaons with the KLOE experiment
  • 2014
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 730, s. 89-94
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>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 -&gt; KSKL -&gt; pi(+)pi(-)pi(+)pi(-) based on 1.7 fb(-1) of data collected by the KLOE experiment at the Frascati phi-factory DA Phi NE. The data are used to perform a Measurement of the CPT-violating parameters Delta a(mu) for neutral kaons in the context of the Standard Model Extension framework. The parameters measured in the reference frame of the fixed stars are: Delta a(0) = (-6.0 +/- 7.7(stat)+/- 3.1(syst)) X 10(-18) GeV, Delta a(x) = (0.9 +/- 1.5(stat)+/- 0.6(syst)) X 10(-18) GeV, Delta a(y) = (-2.0 +/- 1.5(stat)+/- 0.5(syst)) X 10(-18) GeV, Delta a(z) = (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. (C) 2014 The Authors. Published by Elsevier B.V.</p>
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5.
  • Babusci, D., et al. (författare)
  • A new limit on the CP violating decay K-S -&gt; 3 pi(0) with the KLOE experiment
  • 2013
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 723:1-3, s. 54-60
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We have carried out a new direct search for the CP violating decay K-S -&gt; 3 pi(0) with 1.7 fb(-1) of e(+)e(-) collisions collected by the KLOE detector at the Phi-factory DA Phi NE. We have searched for this decay in a sample of about 5.9 x 10(8) KSKL events tagging the K-S by means of the K-L 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 K-S 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 K-S -&gt; 2 pi(0) events in the same sample, we set the upper limit on BR(K-S -&gt; 3 pi(0)) &lt;= 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, vertical bar eta(000)vertical bar &lt;= 0.0088 at 90% C.L., improving by a factor two the latest direct measurement. (c) 2013 Elsevier B.V. All rights reserved.</p>
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6.
  • Babusci, D., et al. (författare)
  • Limit on the production of a light vector gauge boson in phi meson decays with the KLOE detector
  • 2013
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 720:1-3, s. 111-115
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a new limit on the production of a light dark-force mediator with the KLOE detector at DA Phi NE. This boson, called U, has been searched for in the decay phi -&gt; eta U, U -&gt; e(+)e(-), analyzing the. decay eta -&gt; pi(0)pi(0)pi(0) 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 -&gt; pi(+)pi(-)pi(0), 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 &lt; 1.7 x 10(-5) for 30 &lt; M-U &lt; 400 MeV and alpha'/alpha &lt;= 8 x 10(-6) for the sub-region 50 &lt; M-U &lt;210 MeV. This result assumes the Vector Meson Dominance expectations for the phi eta gamma* transition form factor. The dependence of this limit on the transition form factor has also been studied.</p>
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7.
  • Babusci, D., et al. (författare)
  • Measurement of eta meson production in gamma gamma interactions and Gamma(eta -&gt; gamma gamma) with the KLOE detector
  • 2013
  • Ingår i: Journal of High Energy Physics (JHEP). - 1126-6708 .- 1029-8479. ; :1, s. 119
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We present a measurement of eta meson production in photon-photon interactions produced by electron-positron beams colliding with root 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(-) -&gt; e(+)e(-)eta cross section is measured without detecting the outgoing electron and positron, selecting the decays eta -&gt; pi(+)pi(-)pi(0) and eta -&gt; pi(0)pi(0)pi(0). The most relevant background is due to e(+)e(-) -&gt; eta gamma when the monochromatic photon escapes detection. The cross section for this process is measured as sigma(e(+)e(-) -&gt; eta gamma) = (856 +/- 8(stat) +/- 16(syst)) pb. The combined result for the e(+)e(-) -&gt; e(+)e(-)eta cross section is sigma(e(+)e(-) -&gt; e(+)e(-)eta) = (32.72 +/- 1.27(stat) +/- 0.70(syst)) pb. From this we derive the partial width Gamma(eta -&gt; gamma gamma) = (520 +/- 20(stat) +/- 13(syst)) eV. This is in agreement with the world average and is the most precise measurement to date.</p>
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8.
  • Babusci, D., et al. (författare)
  • Precision measurement of sigma (e(+)e(-) -&gt; pi(+)pi(-)gamma)/sigma(e(+)e(-) -&gt;mu(+)mu(-)gamma) and determination of the pi(+)pi(-) contribution to the muon anomaly with the KLOE detector
  • 2013
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 720:4-5, s. 336-343
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We have measured the ratio cr (e(+)e(-) -&gt; pi(+)pi(-)gamma)/sigma(e(+)e(-) -&gt; mu(+)mu(-)gamma), with the KLOE detector at DA Phi NE for a total integrated luminosity of similar to 240 pb(-1). From this ratio we obtain the cross section sigma (e(+)e(-) -&gt; pi(+)pi(-)gamma). From the cross section we determine the pion form factor vertical bar F-pi vertical bar(2) and the two-pion contribution to the muon anomaly a(mu) for 0.592&lt; M-pi pi &lt; 0.975 GeV, Delta(pi pi) a(mu) = (385.1 +/- 1.1(stat) +/- 2.7(sys+theo)) x 10(-10). This result confirms the current discrepancy between the Standard Model calculation and the experimental measurement of the muon anomaly. (c) 2013 Elsevier B.V. All rights reserved.</p>
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9.
  • Babusci, D., et al. (författare)
  • Search for light vector boson production in e(+)e(-) -&gt; mu(+)mu(-)gamma interactions with the KLOE experiment
  • 2014
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 736, s. 459-464
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>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 e(+)e(-) collider, motivated by astrophysical evidence for the presence of dark matter in the Universe. Using e(+)e(-) collisions collected with an integrated luminosity of 239.3 pb(-1), we look for a dimuon mass peak in the reaction e(+)e(-) -&gt; mu(+)mu(-)gamma, corresponding to the decay U -&gt; 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 x 10(-5) to 8.6 x 10(-7) for the mass region 520 &lt; m(U) &lt; 980 MeV.  </p>
10.
  • Babusci, D., et al. (författare)
  • Study of the Dalitz decay phi -&gt; eta e(+)e(-) with the KLOE detector
  • 2015
  • Ingår i: Physics Letters B. - 0370-2693 .- 1873-2445. ; 742, s. 1-6
  • Tidskriftsartikel (refereegranskat)abstract
    • <p>We have studied the vector to pseudoscalar conversion decay phi -&gt; eta e(+)e(-), with.. eta -&gt; pi(0)pi(0)pi(0), with the KLOE detector at DA phi NE. The data set of 1.7 fb(-1) of e(+)e(-) collisions at root s similar to M-phi contains a clear conversion decay signal of similar to 31,000 events from which we measured a value of BR(phi -&gt; eta e(+)e-) = (1.075 +/- 0.007 +/- 0.038) x 10(-4). The same sample is used to determine the transition form factor by a fit to the e(+)e(-) invariant mass spectrum, obtaining b(phi eta)=( 1.28 +/- 0.10(-0.08)(+0.09)) GeV-2, that improves by a factor of five the precision of the previous measurement and is in good agreement with VMD expectations.</p>
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