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1. Anisotropic Local Structure of SrFe2−xNixAs2 (x = 0.00, 0.16, and 0.23) Superconductor Probed by Polarized X-ray Absorption Fine Structure Measurements

Author

M. Y. Hacisalihoglu, L. Tortora, G. Tomassucci, L. Simonelli, and N. L. Saini

Subjects
iron-based superconductors, local structure, X-ray absorption spectroscopy, Technology, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85
Abstract

We have investigated the effect of the Ni substitution on the local structure and the valence electronic states of the SrFe2−xNixAs2 (x = 0.00, 0.16, and 0.23) superconductor with a multi-edge extended X-ray absorption fine structure (EXAFS) and X-ray absorption near edge structure (XANES) spectroscopy. The As K-edge and Fe K-edge EXAFS measurements in the two polarizations (E‖ab and E‖c) show a clear change in the local structure with Ni concentration. The near-neighbor bondlengths and the related mean-square relative displacements (MSRDs) decrease as the Ni content increases. The polarized XANES spectra at the As, Fe and Ni K edges reveal a systematic change in the anisotropy of the valence electronic structure. The results suggest that the quasi 2D electronic structure of this system tends to become more isotropic as the Ni content increases. The local structure and the valence electronic states are discussed in the frame of the evolving electronic transport of the SrFe2−xNixAs2 system.

Published
2024
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2. Precision tests of quantum mechanics and CPT $$ \mathcal{CPT} $$ symmetry with entangled neutral kaons at KLOE

Author

The KLOE-2 collaboration, D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D’Agostini, R. D’Amico, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, E. Diociaiuti, D. Domenici, A. D’Uffizi, A. Fantini, G. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V. L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kamińska, E. A. Kozyrev, W. Krzemien, A. Kupsc, P. A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, A. Passeri, V. Patera, E. Perez del Rio, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E. P. Solodov, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Beyond Standard Model, e +-e − Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The quantum interference between the decays of entangled neutral kaons is studied in the process ϕ → KSKL → π + π − π + π − , which exhibits the characteristic Einstein-Podolsky-Rosen correlations that prevent both kaons to decay into π + π − at the same time. This constitutes a very powerful tool for testing at the utmost precision the quantum coherence of the entangled kaon pair state, and to search for tiny decoherence and CPT $$ \mathcal{CPT} $$ violation effects, which may be justified in a quantum gravity framework. The analysed data sample was collected with the KLOE detector at DAΦNE, the Frascati ϕ-factory, and corresponds to an integrated luminosity of about 1.7 fb −1, i.e. to about 1.7 × 109 ϕ → KSKL decays produced. From the fit of the observed ∆t distribution, being ∆t the difference of the kaon decay times, the decoherence and CPT $$ \mathcal{CPT} $$ violation parameters of various phenomenological models are measured with a largely improved accuracy with respect to previous analyses. The results are consistent with no deviation from quantum mechanics and CPT $$ \mathcal{CPT} $$ symmetry, while for some parameters the precision reaches the interesting level at which — in the most optimistic scenarios — quantum gravity effects might show up. They provide the most stringent limits up to date on the considered models.

Published
2022
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3. The Local Structure of the BiS2 Layer in RE(O,F)BiS2 Determined by In-Plane Polarized X-ray Absorption Measurements

Author

G. M. Pugliese, L. Tortora, E. Paris, T. Wakita, K. Terashima, A. Puri, M. Nagao, R. Higashinaka, T. D. Matsuda, Y. Aoki, T. Yokoya, T. Mizokawa, and N. L. Saini

Subjects
layered materials, local structure, X-ray absorption spectroscopy, Physical and theoretical chemistry, QD450-801
Abstract

We have investigated the local structure of BiS2-based layered materials by Bi L3-edge extended X-ray absorption fine structure (EXAFS) measurements performed on single crystal samples with polarization of the X-ray beam parallel to the BiS2 plane. The results confirm highly instable nature of BiS2 layer, characterized by ferroelectric like distortions. The distortion amplitude, determined by the separation between the two in-plane (Bi-S1) bonds, is found to be highest in LaO0.77F0.23BiS2 with ΔR∼0.26 Å and lowest in NdO0.71F0.29BiS2 with ΔR∼0.13 Å. Among the systems with intrinsic doping, CeOBiS2 shows smaller distortion (ΔR∼0.15 Å) than PrOBiS2 (ΔR∼0.18 Å) while the highest distortion appears for EuFBiS2 revealing ΔR∼0.22 Å. It appears that the distortion amplitude is controlled by the nature of the RE(O,F) spacer layer in the RE(O,F)BiS2 structure. The X-ray absorption near edge structure (XANES) spectra, probing the local geometry, shows a spectral weight transfer that evolves systematically with the distortion amplitude in the BiS2-layer. The results provide a quantitative measurements of the local distortions in the instable BiS2-layer with direct implication on the physical properties of these materials.

Published
2021
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4. Upper limit on the η → π + π − branching fraction with the KLOE experiment

Author

The KLOE-2 collaboration, D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D’Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, D. Domenici, A. D’Uffizi, A. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V. L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kamińska, E. A. Kozyrev, W. Krzemien, A. Kupsc, P. A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, S. Parzych, A. Passeri, V. Patera, E. Perez del Rio, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E. P. Solodov, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Branching fraction, CP violation, e +-e − Experiments, Rare decay, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Based on an integrated luminosity of 1.61 fb −1 e + e − collision data collected with the KLOE detector at DAΦNE, the Frascati ϕ-factory, a search for the P- and CP-violating decay η → π + π − has been performed. Radiative ϕ → ηγ decay is exploited to access the η mesons. No signal is observed in the π + π − invariant mass spectrum, and the upper limit on the branching fraction at 90% confidence level is determined to be ℬ(η → π + π − ) < 4.9 × 10 −6, which is approximately three times smaller than the previous KLOE result. From the combination of these two measurements we get ℬ(η → π + π − ) < 4.4 × 10 −6 at 90% confidence level.

Published
2020
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5. Erratum to: Precision tests of quantum mechanics and CPT $$ \mathcal{CPT} $$ symmetry with entangled neutral kaons at KLOE

Author

The KLOE-2 collaboration, D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D’Agostini, R. D’Amico, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, E. Diociaiuti, D. Domenici, A. D’Uffizi, A. Fantini, G. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V. L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kamińska, E. A. Kozyrev, W. Krzemien, A. Kupsc, P. A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, A. Passeri, V. Patera, E. Perez del Rio, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E. P. Solodov, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Beyond Standard Model, e+-e- Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Published
2022
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6. First particle-by-particle measurement of emittance in the Muon Ionization Cooling Experiment

Author

MICE Collaboration, D. Adams, D. Adey, R. Asfandiyarov, G. Barber, A. de Bari, R. Bayes, V. Bayliss, R. Bertoni, V. Blackmore, A. Blondel, J. Boehm, M. Bogomilov, M. Bonesini, C. N. Booth, D. Bowring, S. Boyd, T. W. Bradshaw, A. D. Bross, C. Brown, G. Charnley, G. T. Chatzitheodoridis, F. Chignoli, M. Chung, D. Cline, J. H. Cobb, D. Colling, N. Collomb, P. Cooke, M. Courthold, L. M. Cremaldi, A. DeMello, A. J. Dick, A. Dobbs, P. Dornan, F. Drielsma, K. Dumbell, M. Ellis, F. Filthaut, P. Franchini, B. Freemire, A. Gallagher, R. Gamet, R. B. S. Gardener, S. Gourlay, A. Grant, J. R. Greis, S. Griffiths, P. Hanlet, G. G. Hanson, T. Hartnett, C. Heidt, P. Hodgson, C. Hunt, S. Ishimoto, D. Jokovic, P. B. Jurj, D. M. Kaplan, Y. Karadzhov, A. Klier, Y. Kuno, A. Kurup, P. Kyberd, J-B. Lagrange, J. Langlands, W. Lau, D. Li, Z. Li, A. Liu, K. Long, T. Lord, C. Macwaters, D. Maletic, B. Martlew, J. Martyniak, R. Mazza, S. Middleton, T. A. Mohayai, A. Moss, A. Muir, I. Mullacrane, J. J. Nebrensky, D. Neuffer, A. Nichols, J. C. Nugent, A. Oates, D. Orestano, E. Overton, P. Owens, V. Palladino, M. Palmer, J. Pasternak, V. Pec, C. Pidcott, M. Popovic, R. Preece, S. Prestemon, D. Rajaram, S. Ricciardi, M. Robinson, C. Rogers, K. Ronald, P. Rubinov, H. Sakamoto, D. A. Sanders, A. Sato, M. Savic, P. Snopok, P. J. Smith, F. J. P. Soler, Y. Song, T. Stanley, G. Stokes, V. Suezaki, D. J. Summers, C. K. Sung, J. Tang, J. Tarrant, I. Taylor, L. Tortora, Y. Torun, R. Tsenov, M. Tucker, M. A. Uchida, S. Virostek, G. Vankova-Kirilova, P. Warburton, S. Wilbur, A. Wilson, H. Witte, C. White, C. G. Whyte, X. Yang, A. R. Young, and M. Zisman

Subjects
Astrophysics, QB460-466, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The Muon Ionization Cooling Experiment (MICE) collaboration seeks to demonstrate the feasibility of ionization cooling, the technique by which it is proposed to cool the muon beam at a future neutrino factory or muon collider. The emittance is measured from an ensemble of muons assembled from those that pass through the experiment. A pure muon ensemble is selected using a particle-identification system that can reject efficiently both pions and electrons. The position and momentum of each muon are measured using a high-precision scintillating-fibre tracker in a 4 T solenoidal magnetic field. This paper presents the techniques used to reconstruct the phase-space distributions in the upstream tracking detector and reports the first particle-by-particle measurement of the emittance of the MICE Muon Beam as a function of muon-beam momentum.

Published
2019
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7. The Local Structure and Metal-Insulator Transition in a Ba3Nb5−xTixO15 System

Author

G. M. Pugliese, F. G. Capone, L. Tortora, F. Stramaglia, L. Simonelli, C. Marini, Y. Kondoh, T. Kajita, T. Katsufuji, T. Mizokawa, and N. L. Saini

Subjects
TTB niobates, metal-insulator transition, local structure, X-ray absorption spectroscopy, Technology, Electrical engineering. Electronics. Nuclear engineering, TK1-9971, Engineering (General). Civil engineering (General), TA1-2040, Microscopy, QH201-278.5, Descriptive and experimental mechanics, QC120-168.85
Abstract

The local structure of the filled tetragonal tungsten bronze (TTB) niobate Ba3Nb5−xTixO15 (x = 0, 0.1, 0.7, 1.0), showing a metal-insulator transition with Ti substitution, has been studied by Nb K-edge extended X-ray absorption fine structure (EXAFS) measurements as a function of temperature. The Ti substitution has been found to have a substantial effect on the local structure, that remains largely temperature independent in the studied temperature range of 80–400 K. The Nb-O bonds distribution shows an increased octahedral distortion induced by Ti substitution, while Nb-Ba distances are marginally affected. The Nb-O bonds are stiffer in the Ti substituted samples, which is revealed by the temperature dependent mean square relative displacements (MSRDs). Furthermore, there is an overall increase in the configurational disorder while the system with Nb 4d electrons turns insulating. The results underline a clear relationship between the local structure and the electronic transport properties suggesting that the metal-insulator transition and possible thermoelectric properties of TTB structured niobates can be tuned by disorder.

Published
2022
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8. Measurement of the branching fraction for the decay KS → πμν with the KLOE detector

Author

D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, D. Domenici, A. D'Uffizi, A. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V.L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kamińska, E.A. Kozyrev, W. Krzemien, A. Kupsc, P.A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, S. Parzych, A. Passeri, V. Patera, E. Perez del Rio, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E.P. Solodov, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Physics, QC1-999
Abstract

Based on a sample of 300 million KS mesons produced in ϕ→KLKS decays recorded by the KLOE experiment at the DAΦNE e+e− collider we have measured the branching fraction for the decay KS→πμν. The KS mesons are identified by the interaction of KL mesons in the detector. The KS→πμν decays are selected by a boosted decision tree built with kinematic variables and by a time-of-flight measurement. Signal efficiencies are evaluated with data control samples of KL→πμν decays. A fit to the reconstructed muon mass distribution finds 7223±180 signal events. Normalising to the KS→π+π− decay events the result for the branching fraction is B(KS→πμν)=(4.56±0.11stat±0.17syst)×10−4. It is the first measurement of this decay mode and the result allows an independent determination of |Vus| and a test of the lepton-flavour universality. Keywords: e+e− collisions, K0 meson, Semileptonic decay

Published
2020
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9. Combined limit on the production of a light gauge boson decaying into μ+μ− and π+π−

Author

A. Anastasi, D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, D. Domenici, A. D'Uffizi, A. Fantini, G. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V.L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kamińska, E.A. Kozyrev, W. Krzemien, A. Kupsc, P.A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, A. Passeri, V. Patera, E. Perez del Rio, N. Raha, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E.P. Solodov, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Physics, QC1-999
Abstract

We searched for the μ+μ− decay of a light vector gauge boson, also known as dark photon, in the e+e−→μ+μ−γISR process by means of the Initial State Radiation (ISR) method. We used 1.93 fb−1 of data collected by the KLOE experiment at the DAΦNE ϕ-factory. No structures have been observed over the irreducible μ+μ− background. A 90% CL limit on the ratio ε2=α′/α between the dark coupling constant and the fine structure constant of 3×10−6–2×10−7 has been set in the dark photon mass region between 519 MeV and 973 MeV. This new limit has been combined with the published result obtained investigating the hypothesis of the dark photon decaying into hadrons in e+e−→π+π−γISR events. The combined 90% CL limit increases the sensitivity especially in the ρ–ω interference region and excludes ε2 greater than (13−2)×10−7. For dark photon masses greater than 600 MeV the combined limit is lower than 8 ×10−7 resulting more stringent than present constraints from other experiments. Keywords: e+e− Collisions, Dark forces, Gauge vector boson, Upper limits

Published
2018
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10. Measurement of the charge asymmetry for the KS → πeν decay and test of CPT symmetry with the KLOE detector

Author

The KLOE-2 collaboration, A. Anastasi, D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, B. Cao, G. Capon, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwinski, G. D’Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, D. Domenici, A. D’Uffizi, A. Fantini, G. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V. L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kaminska, E. A. Kozyrev, W. Krzemien, A. Kupsć, S. Loffredo, P. A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, D. Moricciani, P. Moskal, A. Passeri, V. Patera, E. Perez del Rio, N. Raha, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E. P. Solodov, L. Tortora, G. Venanzoni, W. Wislicki, and M. Wolke

Subjects
CP violation, e+-e- Experiments, Flavor physics, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract Using 1.63 fb−1 of integrated luminosity collected by the KLOE experiment about 7 × 104 K S → π ± e ∓ ν decays have been reconstructed. The measured value of the charge asymmetry for this decay is A S = (−4.9 ± 5.7stat ± 2.6syst) × 10−3, which is almost twice more precise than the previous KLOE result. The combination of these two measurements gives A S = (−3.8 ± 5.0stat ± 2.6syst) × 10−3 and, together with the asymmetry of the K L semileptonic decay, provides significant tests of the CPT symmetry. The obtained results are in agreement with CPT invariance.

Published
2018
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11. Combination of KLOE σ (e + e − → π+π−γ(γ)) measurements and determination of a μ π + π − $$ {a}_{\mu}^{\pi^{+}{\pi}^{-}} $$ in the energy range 0.10 < s < 0.95 GeV2

Author

The KLOE-2 collaboration, A. Anastasi, D. Babusci, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwinski, G. D’Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, D. Domenici, A. D’Uffizi, A. Fantini, G. Fantini, P. Fermani, S. Fiore, A. Gajos, P. Gauzzi, S. Giovannella, E. Graziani, V. L. Ivanov, T. Johansson, X. Kang, D. Kisielewska-Kaminska, E. A. Kozyrev, W. Krzemien, A. Kupsc, S. Loffredo, P. A. Lukin, G. Mandaglio, M. Martini, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, A. Passeri, V. Patera, E. Perez del Rio, N. Raha, P. Santangelo, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, E. P. Solodov, L. Tortora, G. Venanzoni, W. Wislicki, M. Wolke, A. Keshavarzi, S.E. Müller, and T. Teubner

Subjects
e+-e- Experiments, Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Abstract The three precision measurements of the cross section σ(e + e − → π + π −γ(γ)) using initial state radiation by the KLOE collaboration provide an important input for the prediction of the hadronic contribution to the anomalous magnetic moment of the muon. These measurements are correlated for both statistical and systematic uncertainties and, therefore, the simultaneous use of these measurements requires covariance matrices that fully describe the correlations. We present the construction of these covariance matrices and use them to determine a combined KLOE measurement for σ(e + e − → π + π −γ(γ)). We find, from this combination, a two-pion contribution to the muon magnetic anomaly in the energy range 0.10 < s < 0.95 GeV2 of a μ π + π − = 489.8 ± 1.7 stat ± 4.8 s y s × 10 − 10 $$ {a}_{\mu}^{\pi^{+}{\pi}^{-}}=\left(489.8\pm {1.7}_{\mathrm{stat}}\pm {4.8}_{\mathrm{sys}}\right)\times {10}^{-10} $$ . Data vectors and covariance matrices are available at http://www.lnf.infn.it/kloe/ppg/ ppg_2017/ppg_2017.html .

Published
2018
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12. Measurement of the running of the fine structure constant below 1 GeV with the KLOE detector

Author

A. Anastasi, D. Babusci, G. Bencivenni, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Dané, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, R. Di Salvo, D. Domenici, A. D'Uffizi, A. Fantini, G. Felici, S. Fiore, A. Gajos, P. Gauzzi, G. Giardina, S. Giovannella, E. Graziani, F. Happacher, L. Heijkenskjöld, T. Johansson, D. Kamińska, W. Krzemien, A. Kupsc, S. Loffredo, P.A. Lukin, G. Mandaglio, M. Martini, M. Mascolo, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, M. Papenbrock, A. Passeri, V. Patera, E. Perez del Rio, A. Ranieri, P. Santangelo, I. Sarra, M. Schioppa, A. Selce, M. Silarski, F. Sirghi, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Vacuum polarization, α running, Physics, QC1-999
Abstract

We have measured the running of the effective QED coupling constant α(s) in the time-like region 0.6

Published
2017
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13. Limit on the production of a low-mass vector boson in e+e−→Uγ, U→e+e− with the KLOE experiment

Author

A. Anastasi, D. Babusci, G. Bencivenni, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, R. Di Salvo, D. Domenici, A. D'Uffizi, A. Fantini, G. Felici, S. Fiore, A. Gajos, P. Gauzzi, G. Giardina, S. Giovannella, E. Graziani, F. Happacher, L. Heijkenskjöld, W. Ikegami Andersson, T. Johansson, D. Kamińska, W. Krzemien, A. Kupsc, S. Loffredo, G. Mandaglio, M. Martini, M. Mascolo, R. Messi, S. Miscetti, G. Morello, D. Moricciani, P. Moskal, A. Palladino, M. Papenbrock, A. Passeri, V. Patera, E. Perez del Rio, A. Ranieri, P. Santangelo, I. Sarra, M. Schioppa, M. Silarski, F. Sirghi, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Dark matter, Dark forces, Dark photon, U boson, A′, Physics, QC1-999
Abstract

The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the light vector mediator of this dark force, the U boson, with the KLOE detector at the DAΦNE e+e− collider. Using an integrated luminosity of 1.54 fb−1, we studied the process e+e−→Uγ, with U→e+e−, using radiative return to search for a resonant peak in the dielectron invariant-mass distribution. We did not find evidence for a signal, and set a 90% CL upper limit on the mixing strength between the Standard Model photon and the dark photon, ε2, at 10−6–10−4 in the 5–520 MeV/c2 mass range.

Published
2015
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14. Search for dark Higgsstrahlung in e+e−→μ+μ− and missing energy events with the KLOE experiment

Author

A. Anastasi, D. Babusci, G. Bencivenni, M. Berlowski, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, B. Cao, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, G. D'Agostini, E. Danè, V. De Leo, E. De Lucia, A. De Santis, P. De Simone, A. Di Cicco, A. Di Domenico, R. Di Salvo, D. Domenici, A. D'Uffizi, A. Fantini, G. Felici, S. Fiore, A. Gajos, P. Gauzzi, G. Giardina, S. Giovannella, E. Graziani, F. Happacher, L. Heijkenskjöld, W. Ikegami Andersson, T. Johansson, D. Kamińska, 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, E. Perez del Rio, A. Ranieri, P. Santangelo, I. Sarra, M. Schioppa, M. Silarski, F. Sirghi, L. Tortora, G. Venanzoni, W. Wiślicki, and M. Wolke

Subjects
Dark matter, Dark forces, U boson, Upper limit, Higgsstrahlung, Physics, QC1-999
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 DAΦNE. 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 2mμ

Published
2015
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15. Study of the Dalitz decay ϕ→ηe+e− with the KLOE detector

Author

D. Babusci, I. Balwierz-Pytko, G. Bencivenni, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, 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. Heijkenskjöld, B. Höistad, T. Johansson, D. Kamińska, 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, 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. Wiślicki, and M. Wolke

Subjects
Physics, QC1-999
Abstract

We have studied the vector to pseudoscalar conversion decay ϕ→ηe+e−, with η→π0π0π0, with the KLOE detector at DAΦNE. The data set of 1.7 fb−1 of e+e− collisions at s∼Mϕ contains a clear conversion decay signal of ∼31,000 events from which we measured a value of BR(ϕ→ηe+e−)=(1.075±0.007±0.038)×10−4. The same sample is used to determine the transition form factor by a fit to the e+e− invariant mass spectrum, obtaining bϕη=(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. Keywords: e+e− collisions, Conversion decay, Transition form factor

Published
2015
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16. Measurement of the absolute branching ratio of the K+→π+π−π+(γ) decay with the KLOE detector

Author

D. Babusci, I. Balwierz-Pytko, G. Bencivenni, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, 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. Heijkenskjöld, B. Höistad, T. Johansson, D. Kamińska, 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, 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. Wiślicki, and M. Wolke

Subjects
Physics, QC1-999
Abstract

The absolute branching ratio of the K+→π+π−π+(γ) decay, inclusive of final-state radiation, has been measured using ∼17 million tagged K+ mesons collected with the KLOE detector at DAΦNE, the Frascati ϕ-factory. The result is:BR(K+→π+π−π+(γ))=0.05565±0.00031stat±0.00025syst a factor ≃ 5 more precise with respect to the previous result. This work completes the program of precision measurements of the dominant kaon branching ratios at KLOE. Keywords: e+e− experiments, Kaon decays

Published
2014
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17. Search for light vector boson production in e+e−→μ+μ−γ interactions with the KLOE experiment

Author

D. Babusci, I. Balwierz-Pytko, G. Bencivenni, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, F. Ceradini, P. Ciambrone, F. Curciarello, E. Czerwiński, 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. Heijkenskjöld, B. Höistad, T. Johansson, K. Kacprzak, D. Kamińska, 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. Wiślicki, M. Wolke, and J. Zdebik

Subjects
Dark matter, Dark forces, U boson, Physics, QC1-999
Abstract

We have searched for a light vector boson U, the possible carrier of a “dark force”, with the KLOE detector at the DAΦNE 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−→μ+μ−γ, corresponding to the decay U→μ+μ−. 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 1.6×10−5 to 8.6×10−7 for the mass region 520

Published
2014
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18. Ageing of Lanthanum Strontium Copper Orthoferrite Powders for Sensing Layers

Author

J.M. Tulliani, M. Natile, L. Tortora, and I. Natali Sora

Subjects
Chemical engineering, TP155-156, Computer engineering. Computer hardware, TK7885-7895
Abstract

Nanosized powders of lanthanum strontium copper orthoferrites La0.8Sr0.2Fe1-xCuxO3-w (LSFC) have been recently proposed as sensing component in chemical sensors for humidity detection. The LSFC powders were prepared by citrate auto-combustion of dry gel obtained from a solution of corresponding nitrates in a citric acid solution. The aged powders were investigated by chemical and structural analysis using X-ray Photoelectron Spectroscopy (XPS), Infrared Spectroscopy and X-Ray Powder Diffraction as a total loss of their sensing properties has been observed after about one year storage of the sensors at room temperature in the laboratory. The detection of surface hydroxides and carbonates species as well as very large Sr and Cu excess within the surface area were important results.

Published
2015
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19. Lattice design and expected performance of the Muon Ionization Cooling Experiment demonstration of ionization cooling

Author

M. Bogomilov, R. Tsenov, G. Vankova-Kirilova, Y. Song, J. Tang, Z. Li, R. Bertoni, M. Bonesini, F. Chignoli, R. Mazza, V. Palladino, A. de Bari, G. Cecchet, D. Orestano, L. Tortora, Y. Kuno, S. Ishimoto, F. Filthaut, D. Jokovic, D. Maletic, M. Savic, O. M. Hansen, S. Ramberger, M. Vretenar, R. Asfandiyarov, A. Blondel, F. Drielsma, Y. Karadzhov, G. Charnley, N. Collomb, K. Dumbell, A. Gallagher, A. Grant, S. Griffiths, T. Hartnett, B. Martlew, A. Moss, A. Muir, I. Mullacrane, A. Oates, P. Owens, G. Stokes, P. Warburton, C. White, D. Adams, R. J. Anderson, P. Barclay, V. Bayliss, J. Boehm, T. W. Bradshaw, M. Courthold, V. Francis, L. Fry, T. Hayler, M. Hills, A. Lintern, C. Macwaters, A. Nichols, R. Preece, S. Ricciardi, C. Rogers, T. Stanley, J. Tarrant, M. Tucker, A. Wilson, S. Watson, R. Bayes, J. C. Nugent, F. J. P. Soler, R. Gamet, G. Barber, V. J. Blackmore, D. Colling, A. Dobbs, P. Dornan, C. Hunt, A. Kurup, J.-B. Lagrange, K. Long, J. Martyniak, S. Middleton, J. Pasternak, M. A. Uchida, J. H. Cobb, W. Lau, C. N. Booth, P. Hodgson, J. Langlands, E. Overton, M. Robinson, P. J. Smith, S. Wilbur, A. J. Dick, K. Ronald, C. G. Whyte, A. R. Young, S. Boyd, P. Franchini, J. R. Greis, C. Pidcott, I. Taylor, R. B. S. Gardener, P. Kyberd, J. J. Nebrensky, M. Palmer, H. Witte, A. D. Bross, D. Bowring, A. Liu, D. Neuffer, M. Popovic, P. Rubinov, A. DeMello, S. Gourlay, D. Li, S. Prestemon, S. Virostek, B. Freemire, P. Hanlet, D. M. Kaplan, T. A. Mohayai, D. Rajaram, P. Snopok, V. Suezaki, Y. Torun, Y. Onel, L. M. Cremaldi, D. A. Sanders, D. J. Summers, G. G. Hanson, and C. Heidt

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

Muon beams of low emittance provide the basis for the intense, well-characterized neutrino beams necessary to elucidate the physics of flavor at a neutrino factory and to provide lepton-antilepton collisions at energies of up to several TeV at a muon collider. The international Muon Ionization Cooling Experiment (MICE) aims to demonstrate ionization cooling, the technique by which it is proposed to reduce the phase-space volume occupied by the muon beam at such facilities. In an ionization-cooling channel, the muon beam passes through a material in which it loses energy. The energy lost is then replaced using rf cavities. The combined effect of energy loss and reacceleration is to reduce the transverse emittance of the beam (transverse cooling). A major revision of the scope of the project was carried out over the summer of 2014. The revised experiment can deliver a demonstration of ionization cooling. The design of the cooling demonstration experiment will be described together with its predicted cooling performance.

Published
2017
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20. Publisher’s Note: High intensity neutrino oscillation facilities in Europe [Phys. Rev. Accel. Beams 16, 021002 (2013)]

Author

T. R. Edgecock, O. Caretta, T. Davenne, C. Densam, M. Fitton, D. Kelliher, P. Loveridge, S. Machida, C. Prior, C. Rogers, M. Rooney, J. Thomason, D. Wilcox, E. Wildner, I. Efthymiopoulos, R. Garoby, S. Gilardoni, C. Hansen, E. Benedetto, E. Jensen, A. Kosmicki, M. Martini, J. Osborne, G. Prior, T. Stora, T. Melo Mendonca, V. Vlachoudis, C. Waaijer, P. Cupial, A. Chance, A. Longhin, J. Payet, M. Zito, E. Baussan, C. Bobeth, E. Bouquerel, M. Dracos, G. Gaudiot, B. Lepers, F. Osswald, P. Poussot, N. Vassilopoulos, J. Wurtz, V. Zeter, J. Bielski, M. Kozien, L. Lacny, B. Skoczen, B. Szybinski, A. Ustrzycka, A. Wroblewski, M. Marie-Jeanne, P. Balint, C. Fourel, J. Giraud, J. Jacob, T. Lamy, L. Latrasse, P. Sortais, T. Thuillier, S. Mitrofanov, M. Loiselet, Th. Keutgen, Th. Delbar, F. Debray, C. Trophine, S. Veys, C. Daversin, V. Zorin, I. Izotov, V. Skalyga, G. Burt, A. C. Dexter, V. L. Kravchuk, T. Marchi, M. Cinausero, F. Gramegna, G. De Angelis, G. Prete, G. Collazuol, M. Laveder, M. Mazzocco, M. Mezzetto, C. Signorini, E. Vardaci, A. Di Nitto, A. Brondi, G. La Rana, P. Migliozzi, R. Moro, V. Palladino, N. Gelli, D. Berkovits, M. Hass, T. Y. Hirsh, M. Schaumann, A. Stahl, J. Wehner, A. Bross, J. Kopp, D. Neuffer, R. Wands, R. Bayes, A. Laing, P. Soler, S. K. Agarwalla, A. Cervera Villanueva, A. Donini, T. Ghosh, J. J. Gomez Cadenas, P. Hernandez, J. Martin-Albo, O. Mena, J. Burguet-Castell, L. Agostino, M. Buizza-Avanzini, M. Marafini, T. Patzak, A. Tonazzo, D. Duchesneau, L. Mosca, M. Bogomilov, Y. Karadzhov, R. Matev, R. Tsenov, E. Akhmedov, M. Blennow, M. Lindner, T. Schwetz, E. Fernandez Martinez, M. Maltoni, J. Menendez, C. Giunti, M. C. Gonzalez Garcia, J. Salvado, P. Coloma, P. Huber, T. Li, J. Lopez Pavon, C. Orme, S. Pascoli, D. Meloni, J. Tang, W. Winter, T. Ohlsson, H. Zhang, L. Scotto-Lavina, F. Terranova, M. Bonesini, L. Tortora, A. Alekou, M. Aslaninejad, C. Bontoiu, A. Kurup, L. J. Jenner, K. Long, J. Pasternak, J. Pozimski, J. J. Back, P. Harrison, K. Beard, A. Bogacz, J. S. Berg, D. Stratakis, H. Witte, P. Snopok, N. Bliss, M. Cordwell, A. Moss, S. Pattalwar, and M. Apollonio

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Published
2016
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21. Neutrino factory

Author

M. Bogomilov, R. Matev, R. Tsenov, M. Dracos, M. Bonesini, V. Palladino, L. Tortora, Y. Mori, T. Planche, J. B. Lagrange, Y. Kuno, E. Benedetto, I. Efthymiopoulos, R. Garoby, S. Gilardoini, M. Martini, E. Wildner, G. Prior, A. Blondel, Y. Karadzhow, M. Ellis, P. Kyberd, R. Bayes, A. Laing, F. J. P. Soler, A. Alekou, M. Apollonio, M. Aslaninejad, C. Bontoiu, L. J. Jenner, A. Kurup, K. Long, J. Pasternak, A. Zarrebini, J. Poslimski, V. Blackmore, J. Cobb, C. Tunnell, C. Andreopoulos, J. R. J. Bennett, S. Brooks, O. Caretta, T. Davenne, C. Densham, T. R. Edgecock, M. Fitton, D. Kelliher, P. Loveridge, A. McFarland, S. Machida, C. Prior, G. Rees, C. Rogers, M. Rooney, J. Thomason, D. Wilcox, C. Booth, G. Skoro, J. J. Back, P. Harrison, J. S. Berg, R. Fernow, J. C. Gallardo, R. Gupta, H. Kirk, N. Simos, D. Stratakis, N. Souchlas, H. Witte, A. Bross, S. Geer, C. Johnstone, N. Makhov, D. Neuffer, M. Popovic, J. Strait, S. Striganov, J. G. Morfín, R. Wands, P. Snopok, S. A. Bagacz, V. Morozov, Y. Roblin, D. Cline, X. Ding, C. Bromberg, T. Hart, R. J. Abrams, C. M. Ankenbrandt, K. B. Beard, M. A. C. Cummings, G. Flanagan, R. P. Johnson, T. J. Roberts, C. Y. Yoshikawa, V. B. Graves, K. T. McDonald, L. Coney, and G. Hanson

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

The properties of the neutrino provide a unique window on physics beyond that described by the standard model. The study of subleading effects in neutrino oscillations, and the race to discover CP-invariance violation in the lepton sector, has begun with the recent discovery that θ_{13}>0. The measured value of θ_{13} is large, emphasizing the need for a facility at which the systematic uncertainties can be reduced to the percent level. The neutrino factory, in which intense neutrino beams are produced from the decay of muons, has been shown to outperform all realistic alternatives and to be capable of making measurements of the requisite precision. Its unique discovery potential arises from the fact that only at the neutrino factory is it practical to produce high-energy electron (anti)neutrino beams of the required intensity. This paper presents the conceptual design of the neutrino factory accelerator facility developed by the European Commission Framework Programme 7 EUROν Design Study consortium. EUROν coordinated the European contributions to the International Design Study for the Neutrino Factory (the IDS-NF) collaboration. The EUROν baseline accelerator facility will provide 10^{21} muon decays per year from 12.6 GeV stored muon beams serving a single neutrino detector situated at a source-detector distance of between 1 500 km and 2 500 km. A suite of near detectors will allow definitive neutrino-scattering experiments to be performed.

Published
2014
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22. High intensity neutrino oscillation facilities in Europe

Author

T. R. Edgecock, O. Caretta, T. Davenne, C. Densam, M. Fitton, D. Kelliher, P. Loveridge, S. Machida, C. Prior, C. Rogers, M. Rooney, J. Thomason, D. Wilcox, E. Wildner, I. Efthymiopoulos, R. Garoby, S. Gilardoni, C. Hansen, E. Benedetto, E. Jensen, A. Kosmicki, M. Martini, J. Osborne, G. Prior, T. Stora, T. Melo Mendonca, V. Vlachoudis, C. Waaijer, P. Cupial, A. Chancé, A. Longhin, J. Payet, M. Zito, E. Baussan, C. Bobeth, E. Bouquerel, M. Dracos, G. Gaudiot, B. Lepers, F. Osswald, P. Poussot, N. Vassilopoulos, J. Wurtz, V. Zeter, J. Bielski, M. Kozien, L. Lacny, B. Skoczen, B. Szybinski, A. Ustrzycka, A. Wroblewski, M. Marie-Jeanne, P. Balint, C. Fourel, J. Giraud, J. Jacob, T. Lamy, L. Latrasse, P. Sortais, T. Thuillier, S. Mitrofanov, M. Loiselet, Th. Keutgen, Th. Delbar, F. Debray, C. Trophine, S. Veys, C. Daversin, V. Zorin, I. Izotov, V. Skalyga, G. Burt, A. C. Dexter, V. L. Kravchuk, T. Marchi, M. Cinausero, F. Gramegna, G. De Angelis, G. Prete, G. Collazuol, M. Laveder, M. Mazzocco, M. Mezzetto, C. Signorini, E. Vardaci, A. Di Nitto, A. Brondi, G. La Rana, P. Migliozzi, R. Moro, V. Palladino, N. Gelli, D. Berkovits, M. Hass, T. Y. Hirsh, M. Schaumann, A. Stahl, J. Wehner, A. Bross, J. Kopp, D. Neuffer, R. Wands, R. Bayes, A. Laing, P. Soler, S. K. Agarwalla, A. Cervera Villanueva, A. Donini, T. Ghosh, J. J. Gómez Cadenas, P. Hernández, J. Martín-Albo, O. Mena, J. Burguet-Castell, L. Agostino, M. Buizza-Avanzini, M. Marafini, T. Patzak, A. Tonazzo, D. Duchesneau, L. Mosca, M. Bogomilov, Y. Karadzhov, R. Matev, R. Tsenov, E. Akhmedov, M. Blennow, M. Lindner, T. Schwetz, E. Fernández Martinez, M. Maltoni, J. Menéndez, C. Giunti, M. C. González García, J. Salvado, P. Coloma, P. Huber, T. Li, J. López Pavón, C. Orme, S. Pascoli, D. Meloni, J. Tang, W. Winter, T. Ohlsson, H. Zhang, L. Scotto-Lavina, F. Terranova, M. Bonesini, L. Tortora, A. Alekou, M. Aslaninejad, C. Bontoiu, A. Kurup, L. J. Jenner, K. Long, J. Pasternak, J. Pozimski, J. J. Back, P. Harrison, K. Beard, A. Bogacz, J. S. Berg, D. Stratakis, H. Witte, P. Snopok, N. Bliss, M. Cordwell, A. Moss, S. Pattalwar, and M. Apollonio

Subjects
Nuclear and particle physics. Atomic energy. Radioactivity, QC770-798
Abstract

The EUROnu project has studied three possible options for future, high intensity neutrino oscillation facilities in Europe. The first is a Super Beam, in which the neutrinos come from the decay of pions created by bombarding targets with a 4 MW proton beam from the CERN High Power Superconducting Proton Linac. The far detector for this facility is the 500 kt MEMPHYS water Cherenkov, located in the Fréjus tunnel. The second facility is the Neutrino Factory, in which the neutrinos come from the decay of μ^{+} and μ^{-} beams in a storage ring. The far detector in this case is a 100 kt magnetized iron neutrino detector at a baseline of 2000 km. The third option is a Beta Beam, in which the neutrinos come from the decay of beta emitting isotopes, in particular ^{6}He and ^{18}Ne, also stored in a ring. The far detector is also the MEMPHYS detector in the Fréjus tunnel. EUROnu has undertaken conceptual designs of these facilities and studied the performance of the detectors. Based on this, it has determined the physics reach of each facility, in particular for the measurement of CP violation in the lepton sector, and estimated the cost of construction. These have demonstrated that the best facility to build is the Neutrino Factory. However, if a powerful proton driver is constructed for another purpose or if the MEMPHYS detector is built for astroparticle physics, the Super Beam also becomes very attractive.

Published
2013
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23. Temperature dependent local inhomogeneity and magnetic moments of (Li1−xFex)OHFeSe superconductors

Author

G. Tomassucci, L. Tortora, G. M. Pugliese, F. Stramaglia, L. Simonelli, C. Marini, K. Terashima, T. Wakita, S. Ayukawa, T. Yokoya, K. Kudo, M. Nohara, T. Mizokawa, and N. L. Saini

Subjects
General Physics and Astronomy, Physical and Theoretical Chemistry
Abstract

Anomalous local structure and magnetic moment of an inhomogeneous FeSe based superconductor indicating importance of the structure and magnetic correlations in these materials.

Published
2023

24. Experimental determination of the energy dependence of the rate of the muon transfer reaction from muonic hydrogen to oxygen for collision energies up to 0.1 eV

Author

M. Stoilov, A. Adamczak, D. Bakalov, P. Danev, E. Mocchiutti, C. Pizzolotto, G. Baldazzi, M. Baruzzo, R. Benocci, M. Bonesini, D. Cirrincione, M. Clemenza, F. Fuschino, A. D. Hillier, K. Ishida, P. J. C. King, A. Menegolli, S. Monzani, R. Ramponi, L. P. Rignanese, R. Sarkar, A. Sbrizzi, L. Tortora, E. Vallazza, A. Vacchi, Stoilov M., Adamczak A., Bakalov D., Danev P., Mocchiutti E., Pizzolotto C., Baldazzi G., Baruzzo M., Benocci R., Bonesini M., Cirrincione D., Clemenza M., Fuschino F., Hillier A.D., Ishida K., King P.J.C., Menegolli A., Monzani S., Ramponi R., Rignanese L.P., Sarkar R., Sbrizzi A., Tortora L., Vallazza E., and Vacchi A.

Subjects
Atomic, Molecular & Optical, Atomic Physics (physics.atom-ph), FOS: Physical sciences, Scattering of atoms, molecules, clusters & ion, Fine & hyperfine structure, Physics - Atomic Physics
Abstract

We report the first experimental determination of the collision-energy dependence of the muon transfer rate from the ground state of muonic hydrogen to oxygen at near-thermal energies. A sharp increase by nearly an order of magnitude in the energy range 0 - 70 meV was found that is not observed in other gases. The results set a reliable reference for quantum-mechanical calculations of low-energy processes with exotic atoms, and provide firm ground for the measurement of the hyperfine splitting in muonic hydrogen and the determination of the Zemach radius of the proton by the FAMU collaboration., 30 pages, 10 figures

Published
2023

27. Upper limit on the η → π + π − branching fraction with the KLOE experiment

Author

S. Miscetti, E. P. Solodov, A. Di Cicco, E. Perez del Rio, Tord Johansson, R. Messi, D. Domenici, W. Wislicki, V. De Leo, S. Giovannella, S. Parzych, Marco Schioppa, F. Bossi, Aleksander Gajos, M. Martini, Filippo Ceradini, Magnus Wolke, P. Gauzzi, B. Cao, A. D'Uffizi, A. De Santis, V. L. Ivanov, A. Di Domenico, E. De Lucia, X. Kang, M. Berlowski, Wojciech Krzemien, E. Dané, Michał Silarski, G. Venanzoni, P. Fermani, Eryk Czerwiński, Vincenzo Patera, Andrzej Kupsc, P. Branchini, Paolo Ciambrone, A. Selce, Antonio Budano, A. Fantini, Paolo Santangelo, P.A. Lukin, D. Kisielewska-Kamińska, C. Bloise, S. Fiore, E. Graziani, D. Babusci, D. Moricciani, E.A. Kozyrev, P. De Simone, Giuseppe Mandaglio, L. Tortora, Florin Sirghi, Paweł Moskal, A. Passeri, F. Curciarello, G. D'Agostini, Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., D'Agostini, G., Dane, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Domenici, D., D'Uffizi, A., Fantini, A., Fermani, P., Fiore, S., Gajos, A., Gauzzi, P., Giovannella, S., Graziani, E., Ivanov, V. L., Johansson, T., Kang, X., Kisielewska-Kaminska, D., Kozyrev, E. A., Krzemien, W., Kupsc, A., Lukin, P. A., Mandaglio, G., Martini, M., Messi, R., Miscetti, S., Moricciani, D., Moskal, P., Parzych, S., Passeri, A., Patera, V., Perez del Rio, E., Santangelo, P., Schioppa, M., Selce, A., Silarski, M., Sirghi, F., Solodov, E. P., Tortora, L., Venanzoni, G., Wislicki, W., and Wolke, M.

Subjects
Nuclear and High Energy Physics, Meson, +, 01 natural sciences, High Energy Physics - Experiment, Nuclear physics, Subatomär fysik, Experiment, 0103 physical sciences, Subatomic Physics, Radiative transfer, Invariant mass, lcsh:Nuclear and particle physics. Atomic energy. Radioactivity, Limit (mathematics), 010306 general physics, Nuclear Experiment, Settore FIS/01, Physics, Luminosity (scattering theory), 010308 nuclear & particles physics, Branching fraction, e, e(+)-e(-) Experiments, −, e +-e − Experiments, CP violation, Experiments, Rare decay, lcsh:QC770-798, High Energy Physics::Experiment
Abstract

Based on an integrated luminosity of 1.61 fb$^{-1}$ $e^+e^-$ collision data collected with the KLOE detector at DA$\Phi$NE, the Frascati $\phi$-factory, a search for the $P$- and $CP$-violating decay $\eta\to\pi^{+}\pi^{-}$ has been performed. Radiative $\phi\to\eta\gamma$ decay is exploited to access the $\eta$ mesons. No signal is observed in the $\pi^{+}\pi^{-}$ invariant mass spectrum, and the upper limit on the branching fraction at 90\% confidence level is determined to be ${\mathcal B}(\eta\to\pi^{+}\pi^{-}), Comment: 11 pages, 3 figures

Published
2020

29. The forger's identikit: A multi-technique characterization of Pippo Oriani's fake paintings

Author

C. Manfriani, M. Zuena, L. Ruggiero, C. Lucarelli, S. Ridolfi, L. Tortora, A. Sodo, Manfriani, C, Zuena, M, Ruggiero, L, Lucarelli, C, Ridolfi, S, Tortora, L, and Sodo, A

Subjects
Authentication, Oriani, Pigment, Dye, Fakes, Process Chemistry and Technology, General Chemical Engineering, Multi-technique characterization
Abstract

This work is part of a multi-disciplinary study aimed at creating the first scientific database to support the future authentication of paintings on the art market. In particular, five fake paintings attributed to the Italian painter Pippo Oriani (1909-1972) have been characterized. Since no scientific literature concerning the material composition used by the artist is available, the five paintings were studied with a multi-technique approach aiming at better understanding the forgery process. The obtained results can be used in the future as a first step to support the authentication of Oriani's artworks on the art market. In particular, it allows to evaluate the con-sistency of data obtained from future scientific investigations on Oriani's artwork with the forgery process re-ported in the present database. Non-invasive diagnostic tools, such as UV imaging, IR and IR-false colour photography, XRF, mu-Raman and FTIR spectroscopies have been used to fully characterize the fake paintings. The combination of these techniques led to obtaining useful information on the support preparation method, the pictorial materials, and the execution technique of the artist/forger(s).A wide range of inorganic pigments and organic dyes have been detected, together with the use of oil and wax as binders. The results revealed a strong similarity among the different paintings, thus supporting the idea that the forger(s) knew very well the original Oriani's pictorial technique.The detailed identification of all the materials used in the forgery process for Oriani's fake paintings will help to support the authentication of other ambiguous paintings in future cases.

Published
2022

30. Muonic atom X-ray spectroscopy for non-destructive analysis of archeological samples

Author

Marco Rendeli, E. Vallazza, Katsu Ishida, Ettore Fiorini, Alessandro Menegolli, Massimiliano Clemenza, Maurizio Bonesini, Valeria Sipala, Giuseppe Gorini, M. Carpinelli, Piernicola Oliva, L. Tortora, E. Mocchiutti, Adrian D. Hillier, M.C. Prata, Andrea Vacchi, Massimo Rossella, L. P. Rignanese, M. Soldani, Oliviero Cremonesi, Clemenza M., Bonesini M., Carpinelli M., Cremonesi O., Fiorini E., Gorini G., Hillier A., Ishida K., Menegolli A., Mocchiutti E., Oliva P., Prata M., Rendeli M., Rignanese L.P., Rossella M., Sipala V., Soldani M., Tortora L., Vacchi A., Vallazza E., Clemenza, M, Bonesini, M, Carpinelli, M, Cremonesi, O, Fiorini, E, Gorini, G, Hillier, A, Ishida, K, Menegolli, A, Mocchiutti, E, Oliva, P, Prata, M, Rendeli, M, Pio Rignanese, L, Rossella, M, Sipala, V, Soldani, M, Tortora, L, Vacchi, A, and Vallazza, E

Subjects
Materials science, Health, Toxicology and Mutagenesis, FIS/07 - FISICA APPLICATA (A BENI CULTURALI, AMBIENTALI, BIOLOGIA E MEDICINA), 010403 inorganic & nuclear chemistry, Muonic atom X-ray spectroscopy · Pulsed muon beam · Non-invasive elemental analysis · SIPM-fibers scintillating hodoscope, 01 natural sciences, Analytical Chemistry, Non destructive, Radiology, Nuclear Medicine and imaging, Pulsed muon beam, Spectroscopy, Non-invasive elemental analysi, Digital data acquisition system, Exotic atom, X-ray spectroscopy, Muon, SIPM-fibers scintillating hodoscope, Muonic atom X-ray spectroscopy, Public Health, Environmental and Occupational Health, Pollution, Archaeology, 0104 chemical sciences, Characterization (materials science), Nuclear Energy and Engineering, Beamline, FIS/04 - FISICA NUCLEARE E SUBNUCLEARE
Abstract

The implementation in the RIKEN-RAL negative muons facility of a new muon beamline monitoring and novel digital data acquisition system for gamma and X-ray spectroscopy are presented. This work also shows the high potential of the muonic atoms X-ray spectroscopy technique in non-destructive elemental characterization of archaeological samples.

Published
2019

31. Measurement of the branching fraction for the decay KS → πμν with the KLOE detector

Author

R. Messi, Filippo Ceradini, A. Selce, Florin Sirghi, E. P. Solodov, T. Johansson, Vincenzo Patera, P.A. Lukin, Andrzej Kupsc, G. Venanzoni, P. Fermani, Paolo Ciambrone, Paweł Moskal, E. Dané, S. Parzych, S. Giovannella, Aleksander Gajos, D. Kisielewska-Kamińska, P. De Simone, D. Moricciani, Antonio Budano, E.A. Kozyrev, V. De Leo, Michał Silarski, Wojciech Krzemien, M. Berlowski, Magnus Wolke, P. Gauzzi, A. Di Domenico, P. Branchini, Paolo Santangelo, E. De Lucia, Wojciech Wiślicki, A. Passeri, M. Martini, D. Domenici, D. Babusci, A. De Santis, L. Tortora, Giuseppe Mandaglio, B. Cao, X. Kang, F. Curciarello, V. L. Ivanov, G. D'Agostini, A. Fantini, C. Bloise, E. Perez del Rio, S. Miscetti, F. Bossi, A. Di Cicco, Marco Schioppa, S. Fiore, E. Graziani, A. D'Uffizi, Eryk Czerwiński, Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwinski, E., D'Agostini, G., Dane, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Domenici, D., D'Uffizi, A., Fantini, A., Fermani, P., Fiore, S., Gajos, A., Gauzzi, P., Giovannella, S., Graziani, E., Ivanov, V. L., Johansson, T., Kang, X., Kisielewska-Kaminska, D., Kozyrev, E. A., Krzemien, W., Kupsc, A., Lukin, P. A., Mandaglio, G., Martini, M., Messi, R., Miscetti, S., Moricciani, D., Moskal, P., Parzych, S., Passeri, A., Patera, V., Perez del Rio, E., Santangelo, P., Schioppa, M., Selce, A., Silarski, M., Sirghi, F., Solodov, E. P., Tortora, L., Venanzoni, G., Wislicki, W., and Wolke, M.

Subjects
Semileptonic decay, +, e, −, collisions, K, 0, meson, Nuclear and High Energy Physics, Meson, 01 natural sciences, Nuclear physics, 0103 physical sciences, e+e-,collisions, e+e, 010306 general physics, Physics, Settore FIS/01, Muon, Mass distribution, 010308 nuclear & particles physics, Branching fraction, Detector, lcsh:QC1-999, K0, mesons, Data control, High Energy Physics::Experiment, e+e− collisions, K0 meson, semileptonic decay, lcsh:Physics, collision
Abstract

Based on a sample of 300 million KS mesons produced in ϕ→KLKS decays recorded by the KLOE experiment at the DAΦNE e+e− collider we have measured the branching fraction for the decay KS→πμν. The KS mesons are identified by the interaction of KL mesons in the detector. The KS→πμν decays are selected by a boosted decision tree built with kinematic variables and by a time-of-flight measurement. Signal efficiencies are evaluated with data control samples of KL→πμν decays. A fit to the reconstructed muon mass distribution finds 7223±180 signal events. Normalising to the KS→π+π− decay events the result for the branching fraction is B(KS→πμν)=(4.56±0.11stat±0.17syst)×10−4. It is the first measurement of this decay mode and the result allows an independent determination of |Vus| and a test of the lepton-flavour universality.

Published
2020

32. The FAMU experiment: muonic hydrogen high precision spectroscopy studies

Author

Joseph Niemela, E. Vallazza, Alessandro Menegolli, Giuseppe Baldazzi, Eugenio Fasci, V. Bonvicini, F. Fuschino, E. Furlanetto, Massimiliano Clemenza, R. Mazza, Barbara Patrizi, R. Sarkar, M. Citossi, P. J. C. King, D. Cirrincione, L. Stoychev, Humberto Cabrera, D. Guffanti, R. Bertoni, C. De Vecchi, A. Pullia, A. de Bari, K. Ishida, M. Baruzzo, Roberta Ramponi, C. Xiao, K. S. Gadedjisso-Tossou, Angela Pirri, P. Danev, Miltcho B. Danailov, H. E. Roman, A. Vacchi, Dimitar Bakalov, M. Stoilov, Gianluca Morgante, L. Colace, M. Rossella, C. Pizzolotto, Livio Gianfrani, L. Tortora, Valter Maggi, Guido Toci, A. Sbrizzi, Luigi Moretti, M. Bonesini, E. Mocchiutti, Andrzej Adamczak, M. Vannini, J. J. Suárez-Vargas, Adrian D. Hillier, Roberto Benocci, G. Zampa, M. De Vincenzi, L. P. Rignanese, Claudio Labanti, F. Chignoli, Pizzolotto, C., Adamczak, A., Bakalov, D., Baldazzi, G., Baruzzo, M., Benocci, R., Bertoni, R., Bonesini, M., Bonvicini, V., Cabrera, H., Cirrincione, D., Citossi, M., Chignoli, F., Clemenza, M., Colace, L., Danailov, M., Danev, P., de Bari, A., De Vecchi, C., de Vincenzi, M., Fasci, E., Furlanetto, E., Fuschino, F., Gadedjisso-Tossou, K. S., Gianfrani, L., Guffanti, D., Hillier, A. D., Ishida, K., King, P. J. C., Labanti, C., Maggi, V., Mazza, R., Menegolli, A., Mocchiutti, E., Moretti, L., Morgante, G., Niemela, J., Patrizi, B., Pirri, A., Pullia, A., Ramponi, R., Rignanese, L. P., Roman, H. E., Rossella, M., Sarkar, R., Sbrizzi, A., Stoilov, M., Stoychev, L., Suarez-Vargas, J. J., Toci, G., Tortora, L., Vallazza, E., Vannini, M., Xiao, C., Zampa, G., Vacchi, A., Suárez-Vargas, J. J., Pizzolotto, C, Adamczak, A, Bakalov, D, Baldazzi, G, Baruzzo, M, Benocci, R, Bertoni, R, Bonesini, M, Bonvicini, V, Cabrera, H, Cirrincione, D, Citossi, M, Chignoli, F, Clemenza, M, Colace, L, Danailov, M, Danev, P, de Bari, A, De Vecchi, C, de Vincenzi, M, Fasci, E, Furlanetto, E, Fuschino, F, Gadedjisso-Tossou, K, Gianfrani, L, Guffanti, D, Hillier, A, Ishida, K, King, P, Labanti, C, Maggi, V, Mazza, R, Menegolli, A, Mocchiutti, E, Moretti, L, Morgante, G, Niemela, J, Patrizi, B, Pirri, A, Pullia, A, Ramponi, R, Rignanese, L, Roman, H, Rossella, M, Sarkar, R, Sbrizzi, A, Stoilov, M, Stoychev, L, Suarez-Vargas, J, Toci, G, Tortora, L, Vallazza, E, Vannini, M, Xiao, C, Zampa, G, and Vacchi, A

Subjects
X-ray detector, Physics, Nuclear and High Energy Physics, Muon, Proton, 010308 nuclear & particles physics, hyperfine splitting, Hadron, proton Zemach radiu, Radius, 01 natural sciences, Oxygen, Nuclear physics, Charge radius, Transfer rate, 0103 physical sciences, LaBr3:Ce scintillator, Physics::Atomic Physics, 010306 general physics, Ground state, Hyperfine structure, muonic hydrogen, Exotic atom
Abstract

The FAMU experiment aims to measure for the first time the hyperfine splitting of the muonic hydrogen ground state. From this measurement the proton Zemach radius can be derived and this will shed light on the determination of the proton charge radius. In this paper, we describe the scientific goal, the method and the detailed preparatory work. This includes the outcome of preliminary measurements, subsequent refined simulations and the evaluation of the expected results. The experimental setup being built for the measurement of the hyperfine splitting to be performed at the RAL laboratory muon facility is also described.

Published
2020

33. Measurement of the muon transfer rate from muonic hydrogen to oxygen in the range 70-336 K

Author

Massimiliano Clemenza, Miltcho B. Danailov, Dimitar Bakalov, M. Stoilov, D. Cirrincione, L. Stoychev, Luigi Moretti, A. de Bari, M. Rossella, L. Colace, Roberto Benocci, Livio Gianfrani, M. De Vincenzi, L. Tortora, K. S. Gadedjisso-Tossou, S. Monzani, Eugenio Fasci, L. P. Rignanese, E. Mocchiutti, A. Pullia, F. Fuschino, R. Mazza, M. Bonesini, Andrzej Adamczak, A. Sbrizzi, Valter Maggi, C. Pizzolotto, P. Danev, José J. Suárez-Vargas, A. Vacchi, E. Vallazza, C. De Vecchi, Giuseppe Baldazzi, Humberto Cabrera, Alessandro Menegolli, Joseph Niemela, M. Baruzzo, Roberta Ramponi, Claudio Labanti, K. Ishida, R. Bertoni, Gianluca Morgante, Pizzolotto C., Sbrizzi A., Adamczak A., Bakalov D., Baldazzi G., Baruzzo M., Benocci R., Bertoni R., Bonesini M., Cabrera H., Cirrincione D., Clemenza M., Colace L., Danailov M., Danev P., de Bari A., De Vecchi C., De Vincenzi M., Fasci E., Fuschino F., Gadedjisso-Tossou K.S., Gianfrani L., Ishida K., Labanti C., Maggi V., Mazza R., Menegolli A., Mocchiutti E., Monzani S., Moretti L., Morgante G., Niemela J., Pullia A., Ramponi R., Rignanese L.P., Rossella M., Stoilov M., Stoychev L., Suarez-Vargas J.J., Tortora L., Vallazza E., Vacchi A., Pizzolotto, C, Sbrizzi, A, Adamczak, A, Bakalov, D, Baldazzi, G, Baruzzo, M, Benocci, R, Bertoni, R, Bonesini, M, Cabrera, H, Cirrincione, D, Clemenza, M, Colace, L, Danailov, M, Danev, P, de Bari, A, De Vecchi, C, De Vincenzi, M, Fasci, E, Fuschino, F, Gadedjisso-Tossou, K, Gianfrani, L, Ishida, K, Labanti, C, Maggi, V, Mazza, R, Menegolli, A, Mocchiutti, E, Monzani, S, Moretti, L, Morgante, G, Niemela, J, Pullia, A, Ramponi, R, Rignanese, L, Rossella, M, Stoilov, M, Stoychev, L, Suarez-Vargas, J, Tortora, L, Vallazza, E, Vacchi, A, Pizzolotto, C., Sbrizzi, A., Adamczak, A., Bakalov, D., Baldazzi, G., Baruzzo, M., Benocci, R., Bertoni, R., Bonesini, M., Cabrera, H., Cirrincione, D., Clemenza, M., Colace, L., Danailov, M., Danev, P., de Bari, A., De Vecchi, C., De Vincenzi, M., Fasci, E., Fuschino, F., Gadedjisso-Tossou, K. S., Gianfrani, L., Ishida, K., Labanti, C., Maggi, V., Mazza, R., Menegolli, A., Mocchiutti, E., Monzani, S., Moretti, L., Morgante, G., Niemela, J., Pullia, A., Ramponi, R., Rignanese, L. P., Rossella, M., Stoilov, M., Stoychev, L., Suarez-Vargas, J. J., Tortora, L., Vallazza, E., and Vacchi, A.

Subjects
Atomic Physics (physics.atom-ph), LaBr, 3, (Ce), Muonic hydrogen, Muonic X-rays, Oxygen, Transfer rate, X-rays, FOS: Physical sciences, General Physics and Astronomy, chemistry.chemical_element, 01 natural sciences, Physics - Atomic Physics, 010305 fluids & plasmas, X-ray, Transfer (computing), 0103 physical sciences, 010306 general physics, Exotic atom, Physics, Range (particle radiation), Muon, Muonic X-ray, chemistry, LaBr3(Ce), Atomic physics
Abstract

The first measurement of the temperature dependence of the muon transfer rate from muonic hydrogen to oxygen was performed by the FAMU collaboration in 2016. The results provide evidence that the transfer rate rises with the temperature in the range 104-300 K. This paper presents the results of the experiment done in 2018 to extend the measurements towards lower (70 K) and higher (336 K) temperatures. The 2018 results confirm the temperature dependence of Λ p O observed in 2016 and sets firm ground for comparison with the theoretical predictions.

Published
2021

34. The upgraded beam monitor system of the FAMU experiment at RIKEN–RAL

Author

Maurizio Bonesini, A. Vacchi, R. Bertoni, M. Rossella, Alessandro Menegolli, L. Tortora, E. Mocchiutti, Michele Prata, E. Vallazza, A. deBari, R. Mazza, Roberto Benocci, Bonesini, M, Benocci, R, Bertoni, R, Mazza, R, Debari, A, Menegolli, A, Prata, M, Rossella, M, Tortora, L, Mocchiutti, E, Vacchi, A, and Vallazza, E

Subjects
Physics, Nuclear and High Energy Physics, Beam diameter, Muon, Scintillating fiber, 010308 nuclear & particles physics, business.industry, SiPM, Beam monitor, 01 natural sciences, Beam monitors, Scintillating fibers, Instrumentation, Square (algebra), Silicon photomultiplier, Optics, 0103 physical sciences, 010306 general physics, business, Beam (structure)
Abstract

A set of three X/Y beam hodoscopes based on square Bicron BCF12 scintillating fibers read by SiPM has been developed for the FAMU experiment at RIKEN–RAL. A beam width (RMS) less than 10 mm is measured in both X/Y directions. Muon rates are measured and found compatible with previous data.

Published
2019

35. Combination of KLOE σ (e+e− → π+π−γ(γ)) measurements and determination of $$ {a}_{\mu}^{\pi^{+}{\pi}^{-}} $$ in the energy range 0.10 < s < 0.95 GeV2

Author

Paolo Santangelo, G. Venanzoni, P. Fermani, A. Passeri, Antonio Budano, N. Raha, E. P. Solodov, V. De Leo, P. A. Lukin, L. Tortora, Magnus Wolke, Stefan E. Müller, Michał Silarski, E. A. Kozyrev, Florin Sirghi, Wojciech Krzemien, D. Moricciani, S. Loffredo, P. Branchini, Aleksander Gajos, A. De Santis, Paweł Moskal, Gianfranco Morello, Filippo Ceradini, W. Wislicki, A. Selce, A. Keshavarzi, G. D'Agostini, E. Dané, M. Berlowski, S. Miscetti, A. Di Domenico, V. L. Ivanov, Vincenzo Patera, Andrzej Kupsc, Thomas Teubner, R. Messi, T. Johansson, B. Cao, Paolo Ciambrone, Marco Schioppa, D. Kisielewska-Kamińska, F. Bossi, G. Fantini, S. Giovannella, D. Domenici, P. De Simone, C. Bloise, Giuseppe Mandaglio, M. Martini, E. De Lucia, X. Kang, A. Fantini, D. Babusci, P. Gauzzi, A. Anastasi, A. D'Uffizi, E. Perez del Rio, Eryk Czerwiński, L. Caldeira Balkeståhl, Francesca Curciarello, S. Fiore, E. Graziani, A. Di Cicco, and Fiore, S.

Subjects
Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, e+-e- Experiments, Muon, Anomalous magnetic dipole moment, 010308 nuclear & particles physics, Hadron, State (functional analysis), Covariance, 01 natural sciences, 0103 physical sciences, Anomaly (physics), 010306 general physics, Energy (signal processing)
Abstract

The three precision measurements of the cross section σ(e + e − → π + π −γ(γ)) using initial state radiation by the KLOE collaboration provide an important input for the prediction of the hadronic contribution to the anomalous magnetic moment of the muon. These measurements are correlated for both statistical and systematic uncertainties and, therefore, the simultaneous use of these measurements requires covariance matrices that fully describe the correlations. We present the construction of these covariance matrices and use them to determine a combined KLOE measurement for σ(e + e − → π + π −γ(γ)). We find, from this combination, a two-pion contribution to the muon magnetic anomaly in the energy range 0.10 < s < 0.95 GeV2 of $$ {a}_{\mu}^{\pi^{+}{\pi}^{-}}=\left(489.8\pm {1.7}_{\mathrm{stat}}\pm {4.8}_{\mathrm{sys}}\right)\times {10}^{-10} $$ a μ π + π − = 489.8 ± 1.7 stat ± 4.8 s y s × 10 − 10 . Data vectors and covariance matrices are available at http://www.lnf.infn.it/kloe/ppg/ ppg_2017/ppg_2017.html.

Published
2018

36. First FAMU observation of muon transfer from μp atoms to higher-Z elements

Author

L. Tortora, A. Vacchi, L. Colace, Maurizio Bonesini, A. Tomaselli, M. Rossella, Anselmo Margotti, E. Vallazza, Claudio Labanti, D. Guffanti, G. Zampa, R. Mazza, A. Curioni, T. Cervi, P. Danev, R. Carbone, Germano Baldazzi, Ezio Previtali, Paolo Rossi, Roberto Benocci, R. Bertoni, M. Furini, K. S. Gadedjisso-Tossou, L. Stoychev, Miltcho B. Danailov, Dimitar Bakalov, Giovanni Baccolo, M. Stoilov, K. Ishida, F. Fuschino, E. Furlanetto, L. P. Rignanese, M. Moretti, Gianluca Morgante, R. Nardò, Massimiliano Nastasi, G. Campana, C. De Vecchi, F. Chignoli, M. De Vincenzi, I. D'Antone, Andrzej Adamczak, C. Pizzolotto, E. Mocchiutti, A. Iaciofano, S. Meneghini, F. Somma, Valter Maggi, M. Zuffa, Alessandro Menegolli, A. Rachevski, A. de Bari, M. Clemenza, V. Bonvicini, Joseph Niemela, Roberta Ramponi, Mocchiutti, E., Bonvicini, V., Carbone, R., Danailov, M., Furlanetto, E., Gadedjisso-Tossou, K.S., Guffanti, D., Pizzolotto, C., Rachevski, A., Stoychev, L., Vallazza, E., Zampa, G., Niemela, J., Ishida, K., Adamczak, A., Baccolo, G., Benocci, R., Bertoni, R., Bonesini, M., Chignoli, F., Clemenza, M., Curioni, A., Maggi, V., Mazza, R., Moretti, M., Nastasi, M., Previtali, E., Bakalov, D., Danev, P., Stoilov, M., Baldazzi, G., Campana, G., D'Antone, I., Furini, M., Fuschino, F., Labanti, C., Margotti, A., Meneghini, S., Morgante, G., Rignanese, L.P., Rossi, P.L., Zuffa, M., Cervi, T., Bari, A.D., Menegolli, A., Vecchi, C.D., Nardò, R., Rossella, M., Tomaselli, A., Colace, L., Vincenzi, M.D., Iaciofano, A., Somma, F., Tortora, L., Ramponi, R., Vacchi, A., Gadedjisso-Tossou, K. S., Baldazzi, Germano, Rignanese, L. P., Rossi, P. L., Bari, A. De, Vecchi, C. De, Vincenzi, M. De, Iaciofano, Alfredo, Mocchiutti, E, Bonvicini, V, Carbone, R, Danailov, M, Furlanetto, E, Gadedjisso-Tossou, K, Guffanti, D, Pizzolotto, C, Rachevski, A, Stoychev, L, Vallazza, E, Zampa, G, Niemela, J, Ishidaf, K, Adamczak, A, Baccolo, G, Benocci, R, Bertoni, R, Bonesini, M, Chignoli, F, Clemenza, M, Curioni, A, Maggi, V, Mazza, R, Moretti, M, Nastasi, M, Previtali, E, Bakalov, D, Danev, P, Stoilov, M, Baldazzi, G, Campana, G, D'Antone, I, Furini, M, Fuschino, F, Labanti, C, Margotti, A, Meneghini, S, Morgante, G, Rignanese, L, Rossi, P, Zuffa, M, Cervi, T, De Bari, A, Menegolli, A, De Vecchi, C, Nardò, R, Rossella, M, Tomaselli, A, Colace, L, De Vincenzi, M, Iaciofano, A, Somma, F, Tortora, L, and Vacchi, R

Subjects
X-ray detector, Pressurized ga, Ground state, chemistry.chemical_element, Charged particle, Measurements of, Atom, 01 natural sciences, Timing detectors, Nuclear physics, 0103 physical sciences, 010306 general physics, Instrumentation, Hyperfine structure, Mathematical Physics, Exotic atom, X rays, Hyperfine splitting, Physics, Kinetic, Argon, Muon, Rutherford appleton laboratorie, 010308 nuclear & particles physics, Muonic hydrogen, X-ray detectors, Transfer rates, X ray detector, Carbon, chemistry, Carbon dioxide, Timing detector, Excited state, Analysis and statistical methods, Physics::Accelerator Physics, X ray apparatu, Analysis and statistical method, Kinetic energy, Beam (structure), Muon transfer rate
Abstract

The FAMU experiment aims to accurately measure the hyperfine splitting of the ground state of the muonic hydrogen atom. A measurement of the transfer rate of muons from hydrogen to heavier gases is necessary for this purpose. In June 2014, within a preliminary experiment, a pressurized gas-target was exposed to the pulsed low-energy muon beam at the RIKEN RAL muon facility (Rutherford Appleton Laboratory, U.K.). The main goal of the test was the characterization of both the noise induced by the pulsed beam and the X-ray detectors. The apparatus, to some extent rudimental, has served admirably to this task. Technical results have been published that prove the validity of the choices made and pave the way for the next steps. This paper presents the results of physical relevance of measurements of the muon transfer rate to carbon dioxide, oxygen, and argon from non-thermalized excited μp atoms. The analysis methodology and the approach to the systematics errors are useful for the subsequent study of the transfer rate as function of the kinetic energy of the μp currently under way. © 2018 The Author(s).

Published
2018

37. Combined limit on the production of a light gauge boson decaying into mu(+) mu(-) and pi(+) pi(-)

Author

P.A. Lukin, E. P. Solodov, E. Perez del Rio, A. D'Uffizi, D. Kisielewska-Kamińska, Michał Silarski, Filippo Ceradini, Paolo Ciambrone, G. Venanzoni, P. Fermani, V. L. Ivanov, P. De Simone, Paweł Moskal, A. De Santis, R. Messi, T. Johansson, G. Fantini, Eryk Czerwiński, E. Dané, Francesca Curciarello, D. Domenici, S. Giovannella, F. Bossi, Antonio Budano, C. Bloise, A. Anastasi, L. Tortora, A. Selce, Marco Schioppa, A. Di Domenico, Giuseppe Mandaglio, Magnus Wolke, P. Gauzzi, S. Miscetti, X. Kang, D. Babusci, N. Raha, A. Fantini, V. De Leo, Florin Sirghi, Vincenzo Patera, Andrzej Kupsc, Wojciech Krzemien, P. Branchini, E. De Lucia, M. Martini, Paolo Santangelo, D. Moricciani, G. D'Agostini, E.A. Kozyrev, A. Di Cicco, A. Passeri, S. Fiore, E. Graziani, Wojciech Wiślicki, M. Berlowski, B. Cao, Aleksander Gajos, Anastasi, A., Babusci, D., Berlowski, M., Bloise, C., Bossi, F., Branchini, P., Budano, A., Cao, B., Ceradini, F., Ciambrone, P., Curciarello, F., Czerwiński, E., D'Agostini, G., Danè, E., De Leo, V., De Lucia, E., De Santis, A., De Simone, P., Di Cicco, A., Di Domenico, A., Domenici, D., D'Uffizi, A., Fantini, A., Fantini, G., Fermani, P., Fiore, S., Gajos, A., Gauzzi, P., Giovannella, S., Graziani, E., Ivanov, V. L., Johansson, T., Kang, X., Kisielewska-Kamińska, D., Kozyrev, E. A., Krzemien, W., Kupsc, A., Lukin, P. A., Mandaglio, G., Martini, M., Messi, R., Miscetti, S., Moricciani, D., Moskal, P., Passeri, A., Patera, V., Perez del Rio, E., Raha, N., Santangelo, P., Schioppa, M., Selce, Andrea, Silarski, M., Sirghi, F., Solodov, E. P., Tortora, L., Venanzoni, G., Wiślicki, W., and Wolke, M.

Subjects
Nuclear and High Energy Physics, Dark forces, e(+) e(-) Collisions, High Energy Physics::Lattice, Electron–positron annihilation, Hadron, Radiation, 01 natural sciences, e+e− Collision, Dark photon, High Energy Physics - Experiment, Subatomär fysik, High Energy Physics::Theory, e+e- Collisions, Dark forces. Gauge vector boson, Upper limits, Astronomi, astrofysik och kosmologi, 0103 physical sciences, Subatomic Physics, Astronomy, Astrophysics and Cosmology, Limit (mathematics), e + e − Collisions, Gauge vector boson, Upper limits, 010306 general physics, Condensed Matter::Quantum Gases, Coupling constant, Physics, Gauge boson, 010308 nuclear & particles physics, High Energy Physics::Phenomenology, Settore FIS/01 - Fisica Sperimentale, Upper limit, Fine-structure constant, lcsh:QC1-999, Dark force, High Energy Physics::Experiment, Atomic physics, lcsh:Physics
Abstract

We searched for the $\mu^+\mu^-$ decay of a light vector gauge boson, also known as dark photon, in the $e^+ e^- \to \mu^+ \mu^- \gamma_{\rm ISR}$ process by means of the Initial State Radiation (ISR) method. We used 1.93~fb$^{-1}$ of data collected by the KLOE experiment at the DA$\Phi$NE $\phi$-factory. No structures have been observed over the irreducible $\mu^+ \mu^-$ background. A 90\% CL limit on the ratio $\varepsilon^2=\alpha^{\prime}/\alpha$ between the dark coupling constant and the fine structure constant of $ 3\times 10^{-6}-2\times 10^{-7}$ has been set in the dark photon mass region between 519 MeV and 973 MeV. This new limit has been combined with the published result obtained investigating the hypothesis of the dark photon decaying into hadrons in $e^+ e^- \to \pi^+ \pi^- \gamma_{\rm ISR}$ events. The combined 90\% CL limit increases the sensitivity especially in the $\rho-\omega$ interference region and excludes $\varepsilon^2$ greater than $(13-2)\times 10^{-7}$. For dark photon masses greater than 600 MeV the combined limit is lower than 8~$\times\, 10^{-7}$ resulting more stringent than present constraints from other experiments., Comment: 7 pages, 9 figures, 1 table, accepted for publication in Physics Letters B

Published
2018

38. CHNET-TANDEM experiment: Use of negative muons at RIKEN-RAL Port4 for elemental characterization of 'Nuragic votive ship' samples

Author

Giuseppe Gorini, Marco Rendeli, E. Mocchiutti, Katsu Ishida, Maurizio Bonesini, M. Minoja, M. Carpinelli, Adrian D. Hillier, M. Clemenza, Alberto Pullia, L. P. Rignanese, L. Tortora, Piernicola Oliva, Alessandro Menegolli, Michele Prata, Oliviero Cremonesi, Ettore Fiorini, Giuseppe Baldazzi, E. Di Stefano, M. Soldani, A. Vacchi, E. Vallazza, Valeria Sipala, G. Ballerini, M. Rossella, Clemenza, M, Baldazzi, G, Ballerini, G, Bonesini, M, Carpinelli, M, Cremonesi, O, DI STEFANO, E, Fiorini, E, Gorini, G, Hillier, A, Ishida, K, Menegolli, A, Minoja, M, Mocchiutti, E, Oliva, P, Prata, M, Pullia, A, Rendeli, M, Rignanese, L, Rossella, M, Sipala, V, Soldani, M, Tortora, L, Vacchi, A, Vallazza, E, Clemenza, M., Baldazzi, G., Ballerini, G., Bonesini, M., Carpinelli, M., Cremonesi, O., Di Stefano, E., Fiorini, E., Gorini, G., Hillier, A., Ishida, K., Menegolli, A., Minoja, M., Mocchiutti, E., Oliva, P., Prata, M., Pullia, A., Rendeli, M., Rignanese, L.P., Rossella, M., Sipala, V., Soldani, M., Tortora, L., Vacchi, A., and Vallazza, E.

Subjects
Physics, Nuclear and High Energy Physics, Muon, Tandem, Sample (material), 010401 analytical chemistry, Atomic muon spectroscopy, Muonic X-rays, Non-destructive bulk analysis, FIS/07 - FISICA APPLICATA (A BENI CULTURALI, AMBIENTALI, BIOLOGIA E MEDICINA), Atomic muon spectroscopy, Muonic X-ray, 010403 inorganic & nuclear chemistry, Non-destructive bulk analysi, 01 natural sciences, 0104 chemical sciences, Characterization (materials science), Semiconductor detector, Nuclear physics, Beam (nautical), Instrumentation, Image resolution, Nuclear and High Energy Physic, Standard material
Abstract

The idea of the CHNET-TANDEM experiment is to develop and optimize a non-destructive technique, which allows analysis deep inside the sample with a good spatial resolution, using a negative muon beam. By selecting the primary muon energies appropriately, bulk analysis can be performed without destructing the sample. The experimental setup used for this experiment, made by 2 hodoscopes and 5 HpGe, allowed us to collect very interesting preliminary data concerning scan momentum, positioning and centering of the samples by means of two hodoscopes, analysis of standard material targets and elemental characterization of Nuragic “Bronze Age” votive ship fragments.

Published
2019

39. High performance DAQ for muon spectroscopy experiments

Author

L. P. Rignanese, M. Bonesini, F. Fuschino, Massimiliano Clemenza, Andrea Vacchi, Katsu Ishida, Adrian D. Hillier, Piernicola Oliva, E. Vallazza, L. Tortora, E. Mocchiutti, G. Ballerini, Mattia Soldani, Soldani, M, Ballerini, G, Bonesini, M, Fuschino, F, Hillier, A, Ishida, K, Mocchiutti, E, Oliva, P, Rignanese, L, Tortora, L, Vacchi, A, Vallazza, E, and Clemenza, M

Subjects
Physics, Nuclear and High Energy Physics, Muon, Physics::Instrumentation and Detectors, 010308 nuclear & particles physics, business.industry, Detector, FIS/07 - FISICA APPLICATA (A BENI CULTURALI, AMBIENTALI, BIOLOGIA E MEDICINA), Scintillator, 01 natural sciences, DAQ and data management, Front end, Trigger, Optics, Silicon photomultiplier, Data acquisition, Front End, Trigger, DAQ and Data Management, 0103 physical sciences, Computer data storage, Physics::Accelerator Physics, 010306 general physics, business, Spectroscopy, Instrumentation, Beam (structure)
Abstract

The main features of the Data AcQuisition systems for the FAMU (on muonic atom physics) and CHNET _ TANDEM (on the development of nondestructive techniques to archaeometry) INFN projects will be described. Both the experiments exploit the RIKEN-RAL Muon Facility beam of ( 20 , 120 ) MeV ∕ c muons and the same experimental setup, which includes a wide range of detectors: HPGe detectors for high resolution spectroscopy ; LaBr 3 scintillators , with both PMT and SiPM readout, for fast and high time resolution spectroscopy; several layers of 32 SiPM readout scintillating fibers for beam monitoring with good spatial and time resolution. The performance of the DAQ in terms of conditioning and processing of such a large number of different detector signals, data storage and analysis and a few examples of the results will be presented.

Published
2019

40. Limit on the production of a low-mass vector boson ine+e−→Uγ,U→e+e−with the KLOE experiment

Author

B. Cao, A. Ranieri, M. Martini, M. Papenbrock, F. Bossi, C. Bloise, R. Messi, G. D'Agostini, E. Dané, T. Johansson, Wojciech Krzemien, Wojciech Wiślicki, A. Di Cicco, F. Sirghi, P. Branchini, Daria Kamińska, S. Miscetti, D. Domenici, V. De Leo, G. Bencivenni, S. Giovannella, Antonio Budano, P. De Simone, G. Venanzoni, A. Fantini, A. Anastasi, S. Fiore, S. Loffredo, E. Graziani, F. Curciarello, Filippo Ceradini, D. Babusci, A. D'Uffizi, Lena Heijkenskjöld, L. Tortora, F. Happacher, Paolo Ciambrone, W. Ikegami Andersson, D. Moricciani, Eryk Czerwiński, R. Di Salvo, A. De Santis, L. Caldeira Balkeståhl, I. Sarra, E. De Lucia, Giuseppe Mandaglio, Paweł Moskal, M. Mascolo, A. Di Domenico, Paolo Santangelo, A. Palladino, Michał Silarski, Vincenzo Patera, Andrzej Kupsc, Gianfranco Morello, G. Felici, Magnus Wolke, P. Gauzzi, A. Passeri, Aleksander Gajos, M. Berlowski, G. Giardina, Marco Schioppa, and E. Perez del Rio

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, 010308 nuclear & particles physics, Electron–positron annihilation, Physics beyond the Standard Model, Dark matter, 01 natural sciences, Dark photon, Vector boson, 0103 physical sciences, Production (computer science), Limit (mathematics), 010306 general physics, Low Mass
Abstract

The existence of a new force beyond the Standard Model is compelling because it could explain several striking astrophysical observations which fail standard interpretations. We searched for the li ...

Published
2015

41. Measurement of the lifetime of tau-lepton

Author

U. Mjoernmark, Edoardo Castelli, F. Pierre, P. Allen, G. W. Van Apeldoorn, R. J. Apsimon, L. Ventura, V. Ruhlmann, Roland Horisberger, L. Bugge, D. Z. Toet, G. Hamel de Monchenault, Andrey Korytov, G. Ekspong, Itzhak Roditi, Gueorgui Chelkov, Pierre Juillot, M. De Beer, M. Bonesini, Y. Sacquin, Josef Strauss, M.A. Lopez Aguera, Francesca Romana Cavallo, Hans Muller, B. Koene, J.A.M.A. Buytaert, W. Venus, L. Di Ciaccio, Jan Krolikowski, N. N. Khovanski, Mitchell Wayne, M. S. Bilenky, G. Tristam, L.J. Carroll, W. Bartl, R. Pain, P. N. Bogolubov, M. J. Bates, J. A. Valls Ferrer, Giovanni Darbo, Christine Kourkoumelis, P. Siegrist, V. V. Lapin, N. Crosland, S. Simonetti, M. Begalli, E. Dahl-Jensen, Paolo Morettini, J. G. Loken, C. De Clercq, Klaus Hamacher, J. P. Laugier, Natale Demaria, R. Lucock, M. Richardson, G. Meola, Toralf Bernhard Skaali, M. Boratav, D. Gamba, P. Beilliere, M. Battaglia, T. Bolognese, W. J. Murray, R. Strub, J-C. Marin, Spyros Tzamarias, G. Cosme, A. Perrotta, G. Borisov, George Kalkanis, P. B. Renton, G. Voulgaris, M. Pimenta, B. A. Khomenko, M. Baubillier, V. Canale, S. Gumenyuk, R. A. Brenner, Stavros Maltezos, M. Bonapart, O. Barring, Y. Dufour, P. D. Dauncey, Sandor Czellar, D. C. Fries, Patrick Jarry, S. J. Alvsvaag, C. Vander Velde, N. De Groot, G. Rinaudo, G. Sette, A. Elliot Peisert, A. Stocchi, Francesco Navarria, J. Zúñiga, P. Astier, W. Bonivento, P. Weilhammer, A. M. Zaitsev, Alexander Vodopyanov, F. Bianchi, G. Vegni, N. Brummer, J. Bjarne, P. O. Hulth, T. Tabarelli, P. Van Dam, M. Davenport, G. Polok, A. Ruiz, Winfried Mitaroff, E. Lieb, P. Antilogus, C. Lambropoulos, Ugo Amaldi, W. De Boer, E. Zevgolatakos, G. Matthiae, Marta Calvi, P. Delpierre, I. Herbst, M. Matveev, R. Mc Nulty, I. Lippi, W. Kucewicz, E. K. Johansson, J. Pyyhtia, Geoffrey Smith, D. Johnson, Louis Lyons, W. Klempt, Renato Turchetta, H. De Boeck, S. Tavernier, G. Wormser, E. Daubie, G. E. Theodosiou, Mogens Dam, D. Fassouliotis, Ariella Cattai, F. Couchot, M. Kopf, M. Tyndel, S. C. Blyth, O. Pingot, G. Wilkinson, M.D.M. De Fez Laso, Juan Fuster, Jacques Lemonne, J. Sanchez, C. Bosio, E.N. Tsyganov, J. H. Wickens, Jose Luis Contreras, T. Kreuzberger, J. Derkaoui, S. Braibant, S. Dagoret, F. Stichelbaut, D. Zavrtanik, A. Tilquin, S. O. Holmgren, L. S. Vertogradov, J. Maillard, M. T. Trainor, P. Vaz, R. Sosnowski, O. Ullaland, Leif J. Jönsson, G. Myatt, F. Adami, V. G. Timofeev, A. G. Frodesen, Pawel Jalocha, Barry King, G. Smadja, L. Mathis, D. Husson, Ugo Gasparini, A. Pullia, J.M. Gago, D. Bertrand, J. Timmermans, I. A. Tyapkin, B.D. Hyams, T. S. Spassoff, Torsten Paul Ake Åkesson, Demetrios Loukas, R. Keranen, Philippe Charpentier, Francisco Matorras, N. Yamdagni, U. Trevisan, H. Furstenau, R. Frühwirth, L. O. Eek, R. C. Shellard, Josef Hrubec, A. M. Segar, A. G. Olshevski, B. Boštjančič, V. Perevozchikov, Theodora Papadopoulou, B. Korzen, Jon Christopher Wikne, C. Defoix, E. I. Rosenberg, A. Campion, S. Volponi, B. Dalmagne, F. Fulda-Quenzer, H. P. Borner, Stefan Schael, A. Lipniacka, Paul Baillon, Alexander Lincoln Read, M. Szeptycka, Tiziano Camporesi, A.J. Camacho Rozas, Abdenour Lounis, M.-H. Gros, Laurent Chevalier, M. Fernandez Alonso, D. Radojicic, V. Obraztsov, Jan Ridky, P. Folegati, Z. Hajduk, K. Kurvinen, Maciej Górski, W. Ruckstuhl, Borge Svane Nielsen, J. J. Lozano, Guido Barbiellini, R. Zukanovich Funchal, B. Franek, H. Wahlen, Ariel Goobar, E. Graziani, P. S. Iversen, F. Fontanelli, Maria Roberta Monge, A. Zalewska, Krzysztof Doroba, N. G. Redaelli, R. Moeller, A. Hakansson, Chiara Meroni, J. H. Koehne, Marco Bozzo, T. Hofmokl, Marek Szczekowski, J. M. Brunet, H. Foeth, Roberto Cirio, I. Roncagliolo, L. K. Resvanis, J. E. Hooper, J. Guy, P. Lutz, W. Krupinski, W. T. Meyer, P. V. Chliapnikov, Tord Ekelof, H. Staeck, D. Benedic, P. Abreu, P. Borgeaud, J. P. Gerber, Tim Adye, E. Rosso, H. Klein, P. Beltran, Peter Kluit, F. Naraghi, P. Frenkiel, K. H. Becks, E. Vallazza, Milos Lokajicek, J. Cuevas Maestro, A. Chan, B. Ueberschaer, Massimo Caccia, H. J. Hilke, D. J. Holthuizen, F. Waldner, S. Haider, Antonio Ferrer, Tuure Tuuva, F. Simonetto, F. Kapusta, K. W. Glitza, Clara Troncon, G. Leder, B. Åsman, W.S.C. Williams, J.-E. Augustin, F. Ledroit, E.N. Gazos, M. Schaeffer, B. Loerstad, Eilam Gross, B. Nijjhar, E. Menichetti, Stefano Ragazzi, K. Furnival, C. Walck, A. De Angelis, P. Collins, D. Delikaris, Vladimir Nikolaenko, C. Caso, J. Drees, Fernand Grard, A. Passeri, D. Crennell, F. Mandl, T. Todorov, H. Burmeister, N. van Eijndhoven, J. Werner, L. Tortora, F. J. Harris, C. De La Vaissiere, C. J. Beeston, Daniel Bloch, F. Cao, Ahmimed Ouraou, Wolfgang Adam, M. L. Turluer, B. W. Heck, M. Mazzucato, P. Szymanski, Robert S. Brown, V.M. Golovatyuk, Carlos Lacasta, K. D. Brand, N. I. Zimin, Krzysztof A. Rybicki, H. B. Crawley, D. Isenhower, A. Pinsent, D. Wormald, K. Woschnagg, A. De Min, Joao Varela, V. Falaleev, M. Dracos, J. J. Gomez Y Cadenas, V. Chorowicz, D. Reid, Yu. Belokopytov, S. Squarcia, Matteo Pegoraro, E. C. Katsoufis, G. Gopal, E. G. Anassontzis, R. Holmes, H. Saarikko, M. Voutilainen, G. Grosdidier, W. Dulinski, K. A. J. Forbes, S. D. Hodgson, S. Ueberschaer, G. Galeazzi, J. P. Engel, P. Bambade, K. Moenig, M. V. Castillo Gimenez, E. J. Sanchez, M. Crozon, T. Buran, Gianni Zumerle, P. Roudeau, Alessandra Romero, J. Kesteman, A. Maltezos, G. Damgaard, F. Verbeure, C. Bricman, M. A E Schyns, Martino Margoni, P. F. Honore, E. Fokitis, G. D. Alekseev, Olga Botner, M. Michelotto, V. Gracco, Pavlos Ioannou, Krzysztof Korcyl, A. N. Sissakian, R. Llosa, Claudia J. Stubenrauch, Carmen García, B. Jean-Marie, Mario Sannino, Eleuterio Spiriti, P. Poropat, Andromachi Tsirou, M. A. Houlden, M. Mc Cubbin, K. Hultqvist, Georgios Stavropoulos, P. David, Andre Augustinus, W. K. Van Doninck, F. Richard, W.-D. Apel, C. Matteuzzi, M. Hahn, D. Vilanova, S. Almehed, F. Hahn, S. Marti, U. Kruener-Marquis, Paolo Ronchese, N. J. Kjaer, Paula Eerola, Lucio Cerrito, M. A. Winter, G. E. Kalmus, H. Palka, G. Skjevling, J. W. Lamsa, F. Barao, T. Henkes, B. De Lotto, G. Crosetti, Evgueni Vlasov, E. Higon, R. Seufert, H. Herr, F. Scuri, A. M. Wetherell, L. G. Tkatchev, Jmv Garcia, L. Lanceri, A. Firestone, M. Vollmer, U. Rossi, Paolo Giacomelli, R. Sekulin, S. Delorme, M. Zito, J. J. Hernandez, T. Moa, G. Maehlum, B. Grossetete, Allan Hallgren, Giovanni Valenti, Antonio Baroncelli, Guenakh Mitselmakher, Fares Djama, José Salt, L. Vibert, M. Jonker, William Trischuk, A. Markou, Cristian Stanescu, P. Branchini, H. Schneider, R. Lauhakangas, Tiziano Rovelli, Mikael Berggren, G. Kantardjian, M. Sessa, M. Los, V. Lepeltier, M. Donszelmann, H. Forsbach, C. Ronnqvist, Paolo Checchia, G. Zhang, A. P. Ostankov, Ph. Gavillet, R. Gokieli, Dietrich Liko, P. Privitera, V. Kostukhin, R. Zitoun, M. Turala, Luc Pape, P. Herquet, R. Contri, Piotr Zalewski, U. Nau-Korzen, Manolis Dris, E. Lillethun, V.A. Uvarov, Daniel Treille, J. N. Jackson, P. Kokkinias, J. Lindgren, Nikita Smirnov, F. Carena, Pierre Billoir, M. Pernicka, I. Hietanen, Jose M. Benlloch, A. Grant, Vaclav Vrba, Hans Dijkstra, G. Lenzen, J. E. Campagne, M. Koratzinos, P. Negri, J.H. Bibby, Göran Jarlskog, A. Letessier-Selvon, J. Dolbeau, P.S.L. Booth, P. N. Ratoff, A. Lopez-Fernandez, J. Marco, M. P. Clara, Maria Elena Pol, S. Katsanevas, D. Y. Bardin, T. A. Filippas, M. Regler, P. Yepes, H. Mueller, C. O. Higgins, B. Bouquet, R. Orava, A. Klovning, Laboratoire d'Annecy de Physique des Particules (LAPP), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Savoie Mont Blanc (USMB [Université de Savoie] [Université de Chambéry])-Centre National de la Recherche Scientifique (CNRS), Institut de Physique Nucléaire de Lyon (IPNL), Centre National de la Recherche Scientifique (CNRS)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3), CMS, Institut de Physique des 2 Infinis de Lyon (IP2I Lyon), Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS)-Institut National de Physique Nucléaire et de Physique des Particules du CNRS (IN2P3)-Université Claude Bernard Lyon 1 (UCBL), Université de Lyon-Université de Lyon-Centre National de la Recherche Scientifique (CNRS), L3, Acciarri, M., Achard, P., Adriani, O., Aguilar Benitez, M., Alcaraz, J., Alemanni, G., Allaby, J., Aloisio, Alberto, Alviggi, Mariagrazia, Ambrosi, G., Anderhub, H., Andreev, V. P., Angelescu, T., Anselmo, F., Arefiev, A., Azemoon, T., Aziz, T., Bagnaia, P., Bajo, A., Baksay, L., Balandras, A., Banerjee, S., Barczyk, A., Barillere, R., Barone, L., Bartalini, P., Basile, M., Battiston, R., Bay, A., Becattini, F., Becker, U., Behner, F., Bellucci, L., Berbeco, R., Berdugo, J., Berges, P., Bertucci, B., Betev, B. L., Bhattacharya, S., Biasini, M., Biland, A., Blaising, J. J., Blyth, S. C., Bobbink, G. J., Bohm, A., Boldizsar, L., Borgia, B., Bourilkov, D., Bourquin, M., Braccini, S., Branson, J. G., V, B., Brochu, F., Buffini, A., Buijs, A., Burger, J. D., Burger, W. J., Cai, X. D., Campanelli, M., Capell, M., Romeo, G. C., Carlino, G., Cartacci, A. M., Casaus, J., Castellini, G., Cavallari, F., Cavallo, N., Cecchi, C., Cerrada, M., Cesaroni, F., Chamizo, M., Chang, Y. H., Chaturvedi, U. K., Chemarin, M., Chen, A., Chen, G., Chen, G. M., Chen, H. F., Chen, H. S., Chiefari, Giovanni, Cifarelli, L., Cindolo, F., Civinini, C., I, C., Clare, R., Coignet, G., Colijn, A. P., Colino, N., Costantini, S., Cotorobai, F., Cozzoni, B., B. d., La, Csilling, A., Cucciarelli, S., Dai, T. S., Van, J. A., D'Alessandro, R., Asmundis, R. d., Deglon, P., Degre, A., Deiters, K., DELLA VOLPE, Domenico, Denes, P., Denotaristefani, F., Salvo, A. D., Diemoz, M., Dierendonck, D. v., Lodovico, F. D., Dionisi, C., Dittmar, M., Dominguez, A., Doria, A., Dova, M. T., Duchesneau, D., Dufournaud, D., Duinker, P., I, D., Mamouni, H. E., Engler, A., Eppling, F. J., Erne, F. C., Extermann, P., Fabre, M., Faccini, R., Falagan, M. A., Falciano, S., Favara, A., Fay, J., Fedin, O., Felcini, M., Ferguson, T., Ferroni, F., Fesefeldt, H., Fiandrini, E., Field, J. H., Filthaut, F., Fisher, P. H., I, F., Forconi, G., Fredj, L., Freudenreich, K., Furetta, C., Galaktionov, Y., Ganguli, S. N., Garcia Abia, P., Gataullin, M., Gau, S. S., Gentile, S., Gheordanescu, N., Giagu, S., Gong, Z. F., Grenier, G., Grimm, O., Gruenewald, M. W., Guida, M., Gulik, R. v., Gupta, V. K., Gurtu, A., Gutay, L. J., Haas, D., Hasan, A., Hatzifotiadou, D., Hebbeker, T., Herve, A., Hidas, P., Hirschfelder, J., Hofer, H., Holzner, G., Hoorani, H., Sr, H., Hu, Y., I, I., Jin, B. N., Jones, L. W., Jong, P. d., I, J., Khan, R. A., Kaur, M., Kienzle Focacci, M. N., Kim, D., Kim, J. K., Kirkby, J., Kiss, D., Kittel, W., Klimentov, A., Konig, A. C., Kopp, A., V, K., Kraber, M., Kraemer, R. W., Krenz, W., Kruger, A., Kunin, A., P. L., De, I, L., Landi, G., Lassila Perini, K., Lebeau, M., Lebedev, A., Lebrun, P., Lecomte, P., Lecoq, P., Coultre, P. L., Lee, H. J., J. M., Le, Leiste, R., Leonardi, E., Levtchenko, P., Li, C., Lokhoded, S., Lin, C. H., Lin, W. T., Linde, F. L., Lista, L., Liu, Z. A., Lohmann, W., Longo, E., Y. S., Lu, Lubelsmeyer, K., Luci, C., Luckey, D., Lugnier, L., Luminari, L., Lustermann, W., W. G., Ma, Maity, M., Malgeri, L., Malinin, A., Mana, C., Mangeol, D., Mans, J., Marchesini, P., Marian, G., Martin, J. P., Marzano, F., G. G. G., Mazumdar, K., Mcneil, R. R., Mele, S., Merola, Leonardo, Meschini, M., Metzger, W. J., Der, M. v., Mihul, A., Milcent, H., Mirabelli, G., Mnich, J., Mohanty, G. B., Molnar, P., Monteleoni, B., Moore, R., Moulik, T., Muanza, G. S., Muheim, F., A. J. M., Musy, M., Napolitano, Marco, Nessi Tedaldi, F., Newman, H., Niessen, T., Nisati, A., Nowak, H., Organtini, G., Oulianov, A., Palomares, C., Pandoulas, D., Paoletti, S., Paolucci, P., Paramatti, R., Park, H. K., Park, I. H., Pascale, G., Passaleva, G., Patricelli, Sergio, Paul, T., Pauluzzi, M., Paus, C., Pauss, F., Pedace, M., Pensotti, S., Perret Gallix, D., Petersen, B., Piccolo, D., Pierella, F., Pieri, M., Piroue, P. A., Pistolesi, E., V, P., Pohl, M., Postema, H., Pothier, J., Produit, N., Prokofiev, D. O., Prokofiev, D., Quartieri, J., Rahal Callot, G., Rahaman, M. A., Raics, P., Raja, N., Ramelli, R., Rancoita, P. G., Raspereza, A., Raven, G., Razis, P., Ren, D., Rescigno, M., Reucroft, S., Rhee, T. v., Riemann, S., Riles, K., Robohm, A., Rodin, J., Roe, B. P., Romero, L., Rosca, A., Rosier Lees, S., Rubio, J. A., Ruschmeier, D., Rykaczewski, H., Saremi, S., Sarkar, S., Salicio, J., Sanchez, E., Sanders, M. P., Sarakinos, M. E., Schafer, C., V, S., Schmidt Kaerst, S., Schmitz, D., Schopper, H., Schotanus, D. J., Schwering, G., Sciacca, Crisostomo, Sciarrino, D., Seganti, A., Servoli, L., Shevchenko, S., Shivarov, N., Shumilov, E., Shvorob, A., Siedenburg, T., Son, D., Smith, B., Spillantini, P., Steuer, M., Stickland, D. P., Stone, A., Stoyanov, B., Straessner, A., Sudhakar, K., Sultanov, G., Sun, L. Z., Suter, H., Swain, J. D., Szillasi, Z., Sztaricskai, T., Tang, X. W., Tauscher, L., Taylor, L., Tellili, B., Timmermans, C., S. C. C., Ting, S. M., Tonwar, S. C., Toth, J., Tully, C., Tung, K. L., Uchida, Y., Ulbricht, J., Valente, E., Vesztergombi, G., I, V., Vicinanza, D., Viertel, G., Villa, S., Vivargent, M., Vlachos, S., Vogel, H., Vogt, H., Vorobyov, A. A., Vorvolakos, A., Wadhwa, M., Wallraff, W., Wang, M., Wang, X. L., Wang, Z. M., Weber, A., Weber, M., Wienemann, P., Wilkens, H., S. X., Wu, Wynhoff, S., Xia, L., Z. Z., Xu, Yamamoto, J., Yang, B. Z., Yang, C. G., Yang, H. J., Yang, M., J. B., Ye, Yeh, S. C., Zalite, A., Zalite, Y., Zhang, Z. P., Zhu, G. Y., Zhu, R. Y., Zichichi, A., Ziegler, F., Zilizi, G., Zoller, M., L3 (IHEF, IoP, FNWI), LEP (IHEF, IoP, FNWI), Achard, Pablo, Ambrosi, Giovanni, Bourquin, Maurice, Braccini, Saverio, Chamizo Llatas, Maria, Deglon, Patrick, Extermann, Pierre, Field, John, Kienzle, Maria-Novella, Pohl, Martin, Sciarrino, Deborah, Aguilarbenitez, M., Ahlen, S., Alpat, B., Alverson, G., Antreasyan, D., Ball, R. C., Banicz, K., Baschirotto, A., Bilei, G. M., Bock, R., Boucham, A., Boutigny, D., Brigljevic, V., Brock, I. C., Busenitz, J., Buytenhuijs, A., Caria, M., Chan, A., Cheng, H. S., Chen, M., Chien, C. Y., Choi, M. T., Clare, I., Cohn, H. O., Cotorbai, F., Delacruz, B., Dalessandro, R., Deasmundis, R., Deboeck, H., Dibitonto, D., Vandierendonck, D., Dilodovico, F., Dorne, I., Drago, E., Duran, I., Dutta, S., Easo, S., Efremenko, Y., Elmamouni, H., Ernenwein, J. P., Fenyi, B., Fernandez, D., Garciaabia, P., Gerald, J., Goldfarb, S., Goldstein, J., Gougas, A., Gratta, G., Hangarter, K., Hartmann, B., Vanhoek, W. C., Hou, S. R., Hu, G., Innocente, V., Janssen, H., Dejong, P., Josamutuberria, I., Kasser, A., Kamyshkov, Y., Kapinos, P., Kapustinsky, J. S., Karyotakis, Y., Kienzlefocacci, M. N., Kim, S. C., Kim, Y. G., Kinnison, W. W., Kirkby, A., Kirkby, D., Korolko, I., Koutsenko, V., Kuijten, H., Deguevara, P. L., Lapoint, C., Lassilaperini, K., Laurikainen, P., Lecoultre, P., Lee, J. S., Lee, K. Y., Leggett, C., Legoff, J. M., Lieb, E., Lu, W., Lustemann, W., Majumder, G., Mangla, S., Marin, A., Mcnally, D., Vondermey, M., Mi, Y., A. J. W., Morganti, S., Mount, R., Muller, S., Nagy, E., Nahn, S., Nessitedaldi, F., Nippe, A., Ostonen, R., Peach, D., Pei, Y. J., Perretgallix, D., Petrak, S., Pevsner, A., Pinto, J. C., Plyaskin, V., Pojidaev, V., Rahalcallot, G., Rattaggi, M., Read, K., Vanrhee, T., Riemers, B. C., Rind, O., Ro, S., Rodriguez, F. J., Rohner, J. A., Santocchia, A., Sassowsky, M., Sauvage, G., Schegelsky, V., Schmidtkaerst, S., Schmitz, P., Schneegans, M., Sens, J. C., Shoutko, V., Shukla, J., Sopczak, A., Soulimov, V., Stone, H., Strauch, K., Susinno, G. F., Uwer, U., Vandewalle, R. T., Vetlitsky, I., Volkert, R., Vorobiev, I., Wang, J. C., Wittgenstein, F., Xu, J., Yao, X. Y., You, J. M., Zemp, P., Zeng, Y., Zhang, Z., Zhou, B., and Zhou, Y.

Subjects
COLLISIONS, Nuclear and High Energy Physics, Particle physics, LUND MONTE-CARLO, PAIR PRODUCTION, Electron–positron annihilation, FOS: Physical sciences, Elementary particle, ddc:500.2, 01 natural sciences, 7. Clean energy, Resonance (particle physics), JET FRAGMENTATION, DECAYS, High Energy Physics - Experiment, Nuclear physics, Particle decay, High Energy Physics - Experiment (hep-ex), 0103 physical sciences, [PHYS.HEXP]Physics [physics]/High Energy Physics - Experiment [hep-ex], SILICON MICROVERTEX DETECTOR, PRECISE MEASUREMENT, Limit (mathematics), QCD ANALYSIS, 010306 general physics, L3 EXPERIMENT, Coupling constant, Physics, Muon, Annihilation, TEST BEAM, E+E-PHYSICS, 010308 nuclear & particles physics, ALPHA(S), High Energy Physics::Phenomenology, Detector, Pair production, SPECTRAL FUNCTIONS, ComputingMethodologies_DOCUMENTANDTEXTPROCESSING, High Energy Physics::Experiment, Particle Physics - Experiment, Lepton
Abstract

The tau lepton lifetime is measured with the L3 detector at LEP using the complete data taken at centre-of-mass energies around the Z pole resulting in tau_tau = 293.2 +/- 2.0 (stat) +/- 1.5 (syst) fs. The comparison of this result with the muon lifetime supports lepton universality of the weak charged current at the level of six per mille. Assuming lepton universality, the value of the strong coupling constant, alpha_s is found to be alpha_s(m_tau^2) = 0.319 +/- 0.015(exp.) +/- 0.014 (theory). The tau lepton lifetime is measured with the L3 detector at LEP using the complete data taken at centre-of-mass energies around the Z pole resulting in τ τ =293.2 ± 2.0 (stat) ± 1.5 (syst) fs . The comparison of this result with the muon lifetime supports lepton universality of the weak charged current at the level of six per mille. Assuming lepton universality, the value of the strong coupling constant, α s is found to be α s ( m τ 2 ) = 0.319 ± 0.015 (exp) ± 0.014 (theory). The tau lepton lifetime is measured with the L3 detector at LEP using the complete data taken at centre-of-mass energies around the Z pole resulting in tau_tau = 293.2 +/- 2.0 (stat) +/- 1.5 (syst) fs. The comparison of this result with the muon lifetime supports lepton universality of the weak charged current at the level of six per mille. Assuming lepton universality, the value of the strong coupling constant, alpha_s is found to be alpha_s(m_tau^2) = 0.319 +/- 0.015(exp.) +/- 0.014 (theory).

Published
2015

42. Combined use of FE-SEM+EDS, TOF-SIMS, ?-FTIR, XRD and OM for the study of ancient gilded artefacts

Author

G.M. Ingo[1], C. Riccucci[1], M. Pascucci[1], E. Messina[1], P. Biocca[2], 3, L. Tortora[2], G. Di Carlo[1], and G. Fierro[4]

Subjects
TOF-SIMS analysis, Optical Microscopy (OM), FE-SEM/EDS investigation, Degradation agents, Corrosion process, Ancient gilded artefacts, FTIR analysis, XRD analysis
Abstract

Gold coated commonly used copper-based objects such as studs, brooches, clasps and a small pendants, dating back to 16th-17th centuries CE, were studied by means of the combined use of FE-SEM/EDS, TOF-SIMS, ?- FTIR, XRD and optical microscopy (OM). In particular, the surface and subsurface chemical features of the gilded objects were investigated, revealing some aspects of the manufacturing methods as well as disclosing the mechanism of degradation occurring during the long-term burial in the soil and the agents involved in this process. Our investigation has made possible to identify the chemistry of the decorative Au layer deposited by using an amalgam, i.e. the fire-gilding, its structure and the corrosion products naturally formed from the interaction with the surrounding environment. The main degradation agents are chlorine, sulphur and phosphorous species that gave rise to the formation of different corrosion products. Indeed the corrosion phenomena are boosted by the metal galvanic coupling which makes gilded-metal art works unstable from a chemical-physical point of view. In perspective of preservation, our results suggest that it is important to prevent the interaction between moisture and nantokite (CuCl), located at the interface between the gilding layer and the substrate, in order to avoid further severe degradation phenomena such as "bronze disease" which transforms the copper substrate into a greenish powder.

Published
2017

43. The construction of the Fiber-SiPM beam monitor system of the R484 and R582 experiments at the RIKEN-RAL muon facility

Author

G. Zampa, R. Mazza, R. Bertoni, Massimo Rossella, T. Cervi, E. Mocchiutti, L. Tortora, M. Bonesini, R. Carbone, A. de Bari, Alessandro Menegolli, Michele Prata, A. Vacchi, F. Chignoli, and E. Vallazza

Subjects
Materials science, Physics - Instrumentation and Detectors, gas and liquid scintillators), Physics::Instrumentation and Detectors, Beam-line instrumentation (beam position and profile monitors, FOS: Physical sciences, 01 natural sciences, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Silicon photomultiplier, Optics, Ionization, Particle tracking detectors, 0103 physical sciences, beam-intensity monitors, Fiber, 010306 general physics, Instrumentation, Mathematical Physics, Scintillation, Muon, 010308 nuclear & particles physics, business.industry, bunch length monitors), Scintillators, scintillation and light emission processes (solid, gas and liquid scintillators), Detector, Instrumentation and Detectors (physics.ins-det), scintillation and light emission processes (solid, Scintillators, Scintillation counter, Physics::Accelerator Physics, business, Beam (structure)
Abstract

The scintillating fiber-SiPM beam monitor detectors, designed to deliver beam informations for the R484 and R582 experiments at the high intensity, low energy pulsed muon beam at the RIKEN-RAL facility, have been successfully constructed and operated. Details on their construction and first performances in beam are reported, Comment: 14th Topical Seminar on Innovative Particle and Radiation Detectors 3-6 October 2016, Siena to be published on JINST

Published
2017

44. Measurement of the absolute branching ratio of the K+→π+π−π+(γ) decay with the KLOE detector

Author

C. Bacci, F. Crucianelli, S. Giovannella, G. De Zorzi, P. Ciambrone, P. Massarotti, Barbara Sciascia, M. Martini, G. Venanzoni, G. Lanfranchi, F. Ambrosino, P. Valente, S. Chi, P. Franzini, M. Palutan, M. L. Ferrer, W. Mei, S. Miscetti, F. Perfetto, T. Capussela, F. Ceradini, B. Di Micco, G. Bencivenni, R. Versaci, G. Saracino, Massimo Antonelli, J. Lee-Franzini, S. Meola, F. Nguyen, Alessandra Doria, C. Forti, G. Xu, F. Cesario, C. Bloise, Claudio Gatti, A. Antonelli, Margherita Primavera, A. Di Domenico, Francesco Lacava, F. Bossi, F. Archilli, A.L. Sibidanov, M. Napolitano, M. Testa, D. Leone, L. Tortora, T. Spadaro, A. Passeri, S. Fiore, Edoardo Gorini, P. De Simone, E. Graziani, G. Felici, P. Branchini, M. Dreucci, Vincenzo Patera, Enrico Pasqualucci, V. V. Kulikov, Cesare Bini, W. Kluge, A. Sciubba, M. Moulson, A. De Santis, E. De Lucia, Pierluigi Campana, F. Murtas, S. Müller, S. Bertolucci, A. Denig, P. Gauzzi, M. Martemianov, Simona Serena Bocchetta, G. Chiefari, C. Di Donato, P. Santangelo, G. Capon, P. Beltrame, and Andrea Ferrari

Subjects
Nuclear physics, Physics, Nuclear and High Energy Physics, Particle physics, Meson, Branching fraction, Electron–positron annihilation, Detector, Pi, Physics::Accelerator Physics, High Energy Physics::Experiment, Radiation
Abstract

The absolute branching ratio of the K+ -> pi(+) pi(-) pi(+) (gamma) decay, inclusive of final-state radiation, has been measured using similar to 17 million tagged K+ mesons collected with the KLOE detector at DA Phi NE, the Frascati phi-factory. The result is: BR(K+ -> pi(+) pi(-) pi(+) (gamma)) = 0.05565 +/- 0.00031(stat) +/- 0.00025(syst) a factor similar or equal to 5 more precise with respect to the previous result. This work completes the program of precision measurements of the dominant kaon branching ratios at KLOE.

Published
2014

45. Search for light vector boson production ine+e−→μ+μ−γinteractions with the KLOE experiment

Author

R. Messi, T. Johansson, S. Giovannella, Aleksander Gajos, Antonio Budano, S. Miscetti, K. Kacprzak, F. Bossi, R. Di Salvo, E. Dané, G. Felici, Vincenzo Patera, Andrzej Kupsc, S. Loffredo, Wojciech Wiślicki, Paweł Moskal, M. Martemianov, F. Happacher, Jarosław Zdebik, G. Giardina, Daria Kamińska, D. Domenici, P. De Simone, Gianfranco Morello, A. Passeri, A. Di Cicco, Marco Schioppa, Magnus Wolke, P. Gauzzi, F. Loddo, G. Venanzoni, A. De Santis, M. Mascolo, C. Bloise, Michał Silarski, A. Ranieri, F. Nguyen, Barbara Sciascia, M. Martini, A. Di Domenico, G. De Robertis, P. Santangelo, A. Palladino, Eryk Czerwiński, L. Caldeira Balkeståhl, I. Sarra, O. Erriquez, S. Fiore, Bo Höistad, G. Fanizzi, E. Graziani, G. Bencivenni, D. Babusci, V. De Leo, D. Moricciani, F. Ceradini, E. De Lucia, I. Balwierz-Pytko, Giuseppe Mandaglio, I. Prado Longhi, P. Franzini, J. Lee-Franzini, Lena Heijkenskjöld, Wojciech Krzemien, P. Branchini, P. Ciambrone, Francesca Curciarello, L. Tortora, and A. Fantini

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle decay, Particle physics, Antiparticle, Electron–positron annihilation, Antimatter, High Energy Physics::Experiment, Elementary particle, Vector boson, Boson, Lepton
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 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(-) -> mu(+)mu(-)gamma, corresponding to the decay U -> 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 < m(U) < 980 MeV.

Published
2014

46. Precision measurements of the e+e−→π+π−(γ) cross section with the KLOE detector

Author

G. Mandaglio, D. Babusci, D. Badoni, I. Balwierz-Pytko, G. Bencivenni, C. Bini, C. Bloise, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, G. Capon, F. Ceradini, P. Ciambrone, E. Czerwiński, E. Danè, 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. Heijkenskjöld, B. Höistad, L. Iafolla, M. Jacewicz, T. Johansson, A. Kupsc, J. Lee-Franzini, B. Leverington, F. Loddo, S. Loffredo, 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. Wiślicki, M. Wolke, and J. Zdebik

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Muon, Luminosity (scattering theory), Photon, Anomalous magnetic dipole moment, Hadron, Form factor (quantum field theory), Atomic and Molecular Physics, and Optics, Nuclear physics, Pion, High Energy Physics::Experiment, Anomaly (physics)
Abstract

The muon anomalous magnetic moment is one of the most precisely measured quantities in particle physics and a persistent discrepancy of about 3 σ between standard model (SM) prediction and the experimental measurement has been observed. The leading order contribution aμhlo is actually the main source of uncertainty in the theoretical evaluation of the muon anomaly. It is obtained by a dispersion integral using the precision measurement of hadronic cross section. The KLOE experiment at the DAΦNE ϕ−factory in Frascati was the first to exploit Initial State Radiation (ISR) processes to obtain the e+e−→π+π−(γ) cross section below 1 GeV, that accounts for most (70%) of the leading order contribution to the muon anomaly. In year 2005 and 2008 the KLOE-collaboration has published two measurements of the π+π− cross section with the photon in the initial state emitted at small angle, and an independent measurement with the photon emitted at large angle was finalized in year 2011. These measurements were normalized using luminosity from Bhabha. In the last years, a new analysis of KLOE data has been performed for obtaining the pion form factor directly from the bin-by-bin π+π−γ to μ+μ−γ ratio. We present the results of this new measurement, showing the comparison with our previous measurements, and its impact on the hadronic contribution to the muon anomaly.

Published
2014

47. A new limit on the CP violating decay KS→3π0 with the KLOE experiment

Author

Paweł Moskal, M. Martemianov, C. F. Redmer, P. Franzini, J. Lee-Franzini, G. Fanizzi, G. Venanzoni, D. Moricciani, G. Capon, V. De Leo, E. De Lucia, I. Balwierz-Pytko, F. Nguyen, I. Prado Longhi, Cecilia Taccini, Magnus Wolke, B. Leverington, Lena Heijkenskjöld, C. Di Donato, K. Kacprzak, P. Gauzzi, F. Loddo, Giuseppe Mandaglio, S. Loffredo, L. Tortora, L. Iafolla, S. Fiore, A. De Santis, P. Ciambrone, Michał Silarski, Bo Höistad, O. Erriquez, Marek Jacewicz, A. Ranieri, P. Santangelo, Francesca Curciarello, Antonio Budano, G. Giardina, E. Graziani, A. Passeri, Vincenzo Patera, Andrzej Kupsc, Marco Schioppa, A. Di Domenico, Cesare Bini, A. Fantini, Jarosław Zdebik, Barbara Sciascia, M. Martini, S. Giovannella, Eryk Czerwiński, G. Bencivenni, S. Miscetti, D. Domenici, W. Wiślicki, F. Gonnella, D. Babusci, Gianfranco Morello, L. Caldeira Balkeståhl, I. Sarra, F. Bossi, E. Dané, R. Messi, T. Johansson, C. Bloise, M. Mascolo, R. Di Salvo, F. Happacher, P. Branchini, G. De Robertis, G. Felici, Davide Badoni, and F. Ceradini

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, 010308 nuclear & particles physics, 01 natural sciences, Standard Model, Calorimeter, Nuclear physics, 0103 physical sciences, CP violation, Direct search, Limit (mathematics), 010306 general physics
Abstract

We have carried out a new direct search for the CP violating decay K-S -> 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 -> 2 pi(0) events in the same sample, we set the upper limit on BR(K-S -> 3 pi(0))

Published
2013

48. Precision measurement of σ(e+e−→π+π−γ)/σ(e+e−→μ+μ−γ) and determination of the π+π− contribution to the muon anomaly with the KLOE detector

Author

A. Di Domenico, P. Lukin, S. Mueller, P. Gauzzi, A. De Santis, Marco Schioppa, F. Loddo, O. Erriquez, M. Wolke, W. Kluge, P. Ciambrone, E. Dané, F. Nguyen, D. Babusci, Francesca Curciarello, Barbara Sciascia, W. Wislicki, M. Martini, D. Domenici, G. Felici, F. Ceradini, A. Passeri, Vincenzo Patera, Li Caldeira Balkeståhl, Eryk Czerwiński, Andrzej Kupsc, D. Moricciani, Giuseppe Mandaglio, G. Fanizzi, P. Branchini, J. Zdebik, S. Miscetti, S. Giovannella, J. Lee-Franzini, I. Prado Longhi, R. Versaci, P. De Simone, G. Bencivenni, M. Mascolo, I. Sarra, Cecilia Taccini, V. De Leo, G. Giardina, E. De Lucia, F. Bossi, I. Balwierz-Pytko, Davide Badoni, G. De Robertis, P. Franzini, L. Iafolla, G. Venanzoni, S. Fiore, Tord Johansson, Bo Höistad, L. Tortora, Lena Heijkenskjöld, E. Graziani, Marek Jacewicz, Antonio Budano, A. Ranieri, C. F. Redmer, E. Iarocci, Cesare Bini, F. Happacher, Gianfranco Morello, F. Gonnella, C. Bloise, G. Capon, P. Santangelo, R. Messi, C. Di Donato, Paweł Moskal, M. Martemianov, and Michał Silarski

Subjects
Physics, Nuclear and High Energy Physics, Muon, Meson, 010308 nuclear & particles physics, Electron–positron annihilation, Hadron, Form factor (quantum field theory), 01 natural sciences, Nuclear physics, Pion, 0103 physical sciences, High Energy Physics::Experiment, 010306 general physics, Lepton, Dimensionless quantity
Abstract

We have measured the ratio cr (e(+)e(-) -> pi(+)pi(-)gamma)/sigma(e(+)e(-) -> 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(-) -> 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< M-pi pi < 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.

Published
2013

49. Measurement of Γ(η→π+π−γ)/Γ(η→π+π−π0) with the KLOE detector

Author

D. Babusci, D. Badoni, I. Balwierz-Pytko, G. Bencivenni, C. Bini, C. Bloise, V. Bocci, F. Bossi, P. Branchini, A. Budano, L. Caldeira Balkeståhl, G. Capon, F. Ceradini, P. Ciambrone, E. Czerwiński, E. Dané, 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. Höistad, 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. Wiślicki, M. Wolke, G. Xu, and J. Zdebik

Subjects
Physics, Nuclear and High Energy Physics, Chiral perturbation theory, 010308 nuclear & particles physics, Gamma ray, Analytical chemistry, 01 natural sciences, Gamma gamma, Luminosity, 0103 physical sciences, Pi, High Energy Physics::Experiment, Invariant mass, Nuclear Experiment, 010306 general physics
Abstract

The ratio R-eta = Gamma(eta -> pi(+)pi(-)gamma)/Gamma(eta -> pi(+)pi(-)pi(0)) has been measured by analysing 22 million phi -> eta gamma decays collected by the KLOE experiment at DANE, corresponding to an integrated luminosity of 558 pb(-1). The eta -> 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 +/- 0.0005(stat)+/- 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 +/- 0.08(stat-0.09syst)(+0.10) +/- 0.02(theo)) GeV-2. 2012 Elsevier B.V. All rights reserved.

Published
2013

50. Measurement of inclusive π 0 production in hadronic Z 0 decays

Author

F. Simonetto, G. Leder, B. Åsman, V. Lefebure, D. Crennell, F. Mandl, G. Smadja, Patrick Jarry, G. Rinaudo, J. Salt, Z. Krumstein, L.N. Gerdyukov, T. Tabarelli, H. Palka, A. De Min, A. Trombini, I. Siccama, G. Sajot, P. Rebecchi, H. Rahmani, M. Blume, F. Barao, R. Mc Nulty, H. De Boeck, B. Jean-Marie, M. Tyndel, A. Deghorain, T. Buran, Markus Elsing, D. Fassouliotis, Ariella Cattai, F. Ledroit, J. Fuster, J.D. Richardson, Richard Jacobsson, O. Smirnova, A. N. Sisakian, A. Petrolini, A. Sadovsky, S. C. Blyth, G. Wilkinson, E. Higon, J. M. Lopez, Leif J. Jönsson, Borge Svane Nielsen, S. De Brabandere, B. De Lotto, G. Crosetti, Evgueni Vlasov, C. Joram, Andrei Nomerotski, J. Dolbeau, P. Bambade, C. Maocun, S. Bosworth, A. Lopez-Fernandez, R. Zuberi, Krzysztof Doroba, A. Passeri, F. Scuri, Chiara Meroni, P. Bruckman, G. W. Van Apeldoorn, L. Ventura, K. Yip, R. Lindner, J. W. Lamsa, Y. Lemoigne, Kathy Huet, Valeriy Pozdniakov, Olga Botner, M. Weierstall, Christine Kourkoumelis, E. Dahl-Jensen, T. Bolognese, K. Kurvinen, P.S.L. Booth, Per Jönsson, Norbert Neumeister, H. Herr, G. Transtromer, Chiara Mariotti, L. G. Tkatchev, Manfred Krammer, A. M. Wetherell, Charles Bricman, P. Kubinec, Peter Kluit, Clara Troncon, Carmen García, A. Seitz, J. P. Tavernet, M. Michelotto, D. Wicke, Javier Sánchez, L. Lanceri, G. Vegni, J. Van Eldik, Stéphane Plaszczynski, I. Lippi, T. S. Hill, H. Foeth, W. Bonivento, I. Stavitski, M. Schimmelpfennig, C. Zacharatou, P. Carrilho, J. J. Hernandez, J. Garcia, Kerem Cankocak, O. Podobrin, M.A. Lopez Aguera, S. Hahn, Francesca Romana Cavallo, M. Berggren, J. H. Wickens, B. Muryn, Marco Paganoni, Jose Luis Contreras, P. Delpierre, B. Ueberschaer, Paul Baillon, D. Zontar, Alexander Lincoln Read, A. Galloni, S. O. Holmgren, A. Klovning, Y. Arnoud, U. Mjoernmark, C. Bosio, P. B. Renton, E. I. Rosenberg, M. Szeptycka, Konstantinos Papageorgiou, H. T. Phillips, Vladimir Cindro, D. C. Fries, Louis Lyons, L. S. Vertogradov, M. Gibbs, R. Aleksan, W. Kucewicz, Tord Ekelof, Piotr Zalewski, B. Marechal, E. C. Katsoufis, A. De Angelis, S. Hoorelbeke, P. Herquet, Marta Calvi, Vincenzo Canale, V. V. Lapin, Geoffrey Smith, C. De Clercq, Marc Winter, G. Myatt, P. Collins, Maurizio Canepa, V. Obraztsov, K. D. Brand, W. J. Murray, L. Vitale, H. B. Crawley, D. Gele, M. Davenport, P. P. Allport, N. I. Zimin, S. Ragazzi, N. Redaelli, B. Golob, C. Kreuter, F. Dupont, P. Seager, Paolo Ronchese, A. G. Frodesen, O. Yushchenko, N. J. Kjaer, W. Oberschulte-Beckmann, E. K. Johansson, G. A. Chelkov, B. Loerstad, H. Wahlen, I. Roncagliolo, Klaus Hamacher, Daniel Bloch, D. Radojicic, Steinar Stapnes, M. Verlato, Ahmimed Ouraou, Tiziano Camporesi, G. Cosme, Juan Abel Barrio, R. C. Shellard, L. Di Ciaccio, Josef Hrubec, T. Burgsmueller, N. Vassilopoulos, Maria Elena Pol, J. Chauveau, S. Katsanevas, Jan Krolikowski, Luiz Mundim, N. N. Khovanski, W. Bartl, Z. Hajduk, Maciej Górski, Demetrios Loukas, I. A. Tyapkin, V.A. Uvarov, R. A. Brenner, Robert S. Brown, S. J. Alvsvaag, E. Agasi, V. Ruhlmann-Kleider, K. H. Becks, P. Lutz, G. Tristram, P. J. Holt, Marco Bozzo, M. L. Andrieux, Manolis Dris, R. Moeller, M. Petrovyck, W. Krupinski, R. Sekulin, V. Nikolaenko, P. Frenkiel, M. Karlsson, A. M. Segar, Sandra Amato, T. A. Filippas, K. Belous, M. Regler, F. Fontanelli, J. P. Laugier, E. Vallazza, T. Moa, M. Pimenta, B. A. Khomenko, R. Barate, P. Roudeau, C. Vander Velde, G. Valenti, Matteo Pegoraro, A. Firestone, L. K. Resvanis, J. Baudot, I. V. Ajinenko, C. Walck, M. S. Bilenky, V. Malychev, Massimo Caccia, L.J. Carroll, A. Buys, A. Normand, C. Weiser, R. Ehret, A. Romero, P. V. Chliapnikov, Imad Baptiste Laktineh, D. Y. Bardin, S. Squarcia, H. Saarikko, Yu. Sedykh, Francesco Navarria, Alberto Benvenuti, W.S.C. Williams, P. Langefeld, Lucio Cerrito, T. Maron, Mogens Dam, H. Mueller, F. Pierre, Vincent Hedberg, A. Ferrer, Ugo Amaldi, J. Medbo, W. De Boer, E. Zevgolatakos, G. Sciolla, G. Maehlum, P. Juillot, D. W. Lane, P. Antilogus, Fabio Cossutti, J. N. Jackson, P. Pages, P. Weilhammer, H. J. Hilke, M. Battaglia, V. Chorowicz, D. Vilanova, J-C. Marin, B. Erzen, R. Gokieli, L. Gorn, Amiran Tomaradze, Fares Djama, O. Ullaland, R. Lauhakangas, Ph. Charpentier, T. Brenke, M. Zito, G. Ekspong, Josef Strauss, V. Chabaud, M. Espirito Santo, W. Venus, T. Lesiak, J. Rames, W. Van Doninck, P. N. Ratoff, W. Neumann, P. Kokkinias, Y. Dufour, Sandor Czellar, P. Gunnarsson, Spyros Tzamarias, O. Tchikilev, B. Franek, S. Lamblot, L. Bugge, P. Niss, W. T. Meyer, K. Grzelak, M. Prest, Lydia Roos, M. Mazzucato, Allan Hallgren, S. Simonetti, M. Begalli, R. Nicolaidou, A. J. Camacho Rozas, I. Kronkvist, J. P. Gerber, C. K. Legan, G. Polok, R. Orava, M. Donszelmann, Yu. Gouz, Danilo Zavrtanik, F. Stichelbaut, P. Buschmann, R. Mc Kay, C. Martinez-Rivero, J. Drees, William Trischuk, A. Markou, G. Eigen, A. Andreazza, Evangelos Gazis, Tiziano Rovelli, B. Bouquet, Ernesto Migliore, D. Z. Toet, P. Siegrist, P. H. Kramer, I. Ripp, R. Keranen, F. Zach, S. S. Meyer, R. Janik, Stanislav Nemecek, Francisco Matorras, N. Pukhaeva, Pierre Billoir, D. Souza-Santos, G. Della Ricca, B. Tome, Th. D. Papadopoulou, M. Dracos, L. Chaussard, J. Dahm, C. Defoix, F. Fulda-Quenzer, E. Graziani, J. E. Augustin, J. M. Brunet, D. J. Holthuizen, Cristian Stanescu, P. Branchini, P. A. Fischer, Vaclav Vrba, H. Schneider, Y. Sacquin, Hans Dijkstra, C. Gaspar, T. L. Hessing, R. Contri, Wolfgang Adam, G. C. Zucchelli, Yu. Belokopytov, V. Lepeltier, Paolo Checchia, Ph. Gavillet, R. Henriques, M. Kaiser, M. Gunther, J. MacNaughton, C. Caso, Rupert Leitner, G. Piana, Claire Bourdarios, P. Paganini, M. Nieuwenhuizen, G. Matthiae, Luc Pape, A. Maio, L. Brillault, J. P. Engel, M. V. Castillo Gimenez, Paul Dauncey, N. Demaria, G. Damgaard, V. Gracco, Klaus Moenig, M. A. Houlden, W. Da Silva, W. A. Mitaroff, F. Richard, P. Chochula, C. Matteuzzi, S. Almehed, R. Chierici, F. Hahn, F. Formenti, F. Cao, N. Ershaidat, V. Bocci, O. Kouznetsov, Martino Margoni, E. Fokitis, Luis Peralta, F. Kapusta, Ugo Gasparini, K. A. Drees, Guido Barbiellini, J. Guy, Marek Szczekowski, E. Rosso, H. Klein, Tim Adye, K. Osterberg, A. Baroncelli, P. Van Dam, G. D. Alekseev, C. De La Vaissiere, Mario Sannino, M. Mc Cubbin, K. Hultqvist, Gary John Barker, K. Woschnagg, A. Tilquin, L. De Paula, Pawel Jalocha, Barry King, E. Falk, M. J. Bates, E. Spiriti, M. Bonesini, R. Frühwirth, Toralf Bernhard Skaali, T. Spassov, D. Gamba, M. Witek, J. Timmermans, B. Dalmagne, F. Verbeure, B. Stugu, S. Gumenyuk, M. Gandelman, A. Lipniacka, Milos Lokajicek, D. Bertrand, L. Tortora, F. J. Harris, M. Pindo, E. Cortina, W. Ruckstuhl, Carlos Lacasta, Krzysztof A. Rybicki, G. Borisov, M. Baubillier, Achille Stocchi, A. M. Zaitsev, Alexander Vodopyanov, F. Bianchi, B. Koene, F. Parodi, E. Karvelas, J. Cuevas Maestro, T. Todorov, M. Wielers, K. Karafasoulis, M. L. Turluer, D. Reid, R. Sosnowski, P. Vincent, Gianni Zumerle, F. Naraghi, P. Poropat, Andromachi Tsirou, Andre Augustinus, Paolo Morettini, J. G. Loken, C. De Saint-Jean, P. Beilliere, S. Marti i Garcia, D. Edsall, G. Grosdidier, A. Ruiz, M. A E Schyns, W. Hao, O. Barring, A. Onofre, T. J. V. Bowcock, F. Carena, A. G. Olshevski, U. Schwickerath, Maria Roberta Monge, A. Zalewska, M. Pernicka, Jesus Marco, G. Lenzen, R. Strub, Jacques Lemonne, F. Martinez-Vidal, V. Kostioukhine, M. Koratzinos, Laurent Mirabito, M. Feindt, S. Sánchez Navas, P. Negri, P. Sponholz, Göran Jarlskog, G. P. Gopal, W. D. Apel, Dietrich Liko, P. Privitera, Chariclia Petridou, Branislav Sitar, M. Reale, Daniel Treille, M. Bigi, J. Ridky, C. Parkes, Nikita Smirnov, and Andrea Perrotta

Subjects
Scattering cross-section, Physics, Particle physics, Photon, Physics and Astronomy (miscellaneous), 010308 nuclear & particles physics, Hadron, Function (mathematics), 01 natural sciences, Nuclear physics, Distribution (mathematics), Electromagnetic calorimeter, 0103 physical sciences, Production (computer science), 010306 general physics, Parton shower
Abstract

An analysis is presented of inclusiveπ 0 production inZ 0 decays measured with the DELPHI detector. At low energies,π 0 decays are reconstructed by using pairs of converted photons and combinations of converted photons and photons reconstructed in the barrel electromagnetic calorimeter (HPC). At high energies (up to $$x_p = 2 \cdot p_\pi /\sqrt s = 0.75$$ ) the excellent granularity of the HPC is exploited to search for two-photon substructures in single showers. The inclusive differential cross section is measured as a function of energy forqq andbb events. The number ofπ 0’s per hadronicZ 0 event isN(π 0)/Z 0 =9.2±0.2(stat)±1.0(syst) and forbb events the number ofπ 0’s is N(π 0)/bb=10.1±0.4(stat)±1.1(syst). The ratio of the number ofπ 0’s inbb events to hadronicZ 0 events is less affected by the systematic errors and is found to be 1.09±0.05±0.01. The measuredπ 0 cross sections are compared with the predictions of different parton shower models. For hadronic events, the peak position in theξ p=ln(1/xp) distribution isξ* p =3.90 −0.14 +0.24 . The average number ofπ 0’s from the decay of primary B hadrons is found to be N(B→π 0 X)/B hadron=2.78±0.15(stat)±0.60(syst).

Published
2016

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