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F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
G. Bencivenni,
C. Bini,
C. Bloise,
S. Bocchetta,
F. Bossi,
P. Branchini, [......],
P. Santangelo,
B. Sciascia,
A. Sibidanov,
T. Spadaro,
C. Taccini,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci, Kloe Collaboration
[show abstract]
[hide abstract]
ABSTRACT: Ambrosino, F. Antonelli, A. Antonelli, M. Archilli, F. Bencivenni, G. Bini, C. Bloise, C. Bocchetta, S. Bossi, F. Branchini, P. Capon, G. Capussela, T. Ceradini, F. Ciambrone, P. De Angelis, A. De Lucia, E. De Maria, M. De Santis, A. De Simone, P. De Zorzi, G. Denig, A. Di Domenico, A. Di Donato, C. Di Micco, B. Dreucci, M. Felici, G. Fiore, S. Franzini, P. Gatti, C. Gauzzi, P. Giovannella, S. Graziani, E. Jacewicz, M. Kulikov, V. Lee-Franzini, J. Martini, M. Massarotti, P. Meola, S. Miscetti, S. Moulson, M. Mueller, S. Murtas, F. Napolitano, M. Nguyen, F. Palutan, M. Passeri, A. Patera, V. Santangelo, P. Sciascia, B. Sibidanov, A. Spadaro, T. Taccini, C. Tortora, L. Valente, P. Venanzoni, G. Versaci, R.
01/2011; 71.
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F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
I. Balwierz,
G. Bencivenni,
C. Bini,
C. Bloise,
S. Bocchetta,
F. Bossi, [......],
B. Sciascia,
M. Silarski,
T. Spadaro,
C. Taccini,
L. Tortora,
G. Venanzoni,
R. Versaci,
G. Xu,
J. Zdebik, Kloe Collaboration
[show abstract]
[hide abstract]
ABSTRACT: We report the first observation of the rare eta -> e(+)e(-)e(+)e(-)(gamma) decay based on 1.7 fb(-1) collected by the KLOE experiment at the DA Phi NE phi-factory. The selection of the e(+)e(-)e(+)e(-) final state is fully inclusive of radiation. We have identified 362 +/- 29 events resulting in a branching ratio of (2.4 +/- 0.2(stat+bckg) +/- 0.1(syst)) x 10(-5).
Physics Letters B 01/2011; 702:324-328. · 3.95 Impact Factor
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KLOE Collaboration,
F. Ambrosino,
F. Archilli,
P. Beltrame,
G Bencivenni,
C. Bini,
C. Bloise,
S. Bocchetta,
F Bossi,
P Branchini, [......],
F Murtas,
M Napolitano,
F. Nguyen,
A Passeri,
V. Patera,
P. Santangelo,
C. Taccini,
L Tortora,
G. Venanzoni,
R. Versaci
[show abstract]
[hide abstract]
ABSTRACT: We have measured the cross section of the radiative process e+e- ->
pi+pi-gamma with the KLOE detector at the Frascati phi-factory DAPHNE, from
events taken at a CM energy W=1 GeV. Initial state radiation allows us to
obtain the cross section for e+e- -> pi+pi-, the pion form factor |F_pi|^2 and
the dipion contribution to the muon magnetic moment anomaly, Delta a_mu^{pipi}
= (478.5+-2.0_{stat}+-5.0_{syst}+-4.5_{th}) x 10^{-10} in the range 0.1 <
M_{pipi}^2 < 0.85 GeV^2, where the theoretical error includes a SU(3) ChPT
estimate of the uncertainty on photon radiation from the final pions. The
discrepancy between the Standard Model evaluation of a_mu and the value
measured by the Muon g-2 collaboration at BNL is confirmed.
Physics Letters B 06/2010; 700. · 3.95 Impact Factor
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Chin. Phys. C. 01/2010; 34:1379-1382.
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F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
P. Beltrame,
G. Bencivenni,
C. Bini,
C. Bloise,
S. Bocchetta,
F. Bossi, [......],
V. Patera,
P. Santangelo,
B. Sciascia,
A. Sibidanov,
T. Spadaro,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci, Kloe Collaboration
European Physical Journal C 01/2010; 65:703-703. · 3.63 Impact Factor
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F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
P. Beltrame,
G. Bencivenni,
C. Bini,
C. Bloise,
S. Bocchetta,
F. Bossi, [......],
V. Patera,
P. Santangelo,
B. Sciascia,
A. Sibidanov,
T. Spadaro,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci, Kloe Collaboration
01/2010; 65:703-703.
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Kloe Collaboration,
F Ambrosino,
A Antonelli,
M Antonelli,
F Archilli,
P Beltrame,
G Bencivenni,
C Bini,
C Bloise,
S Bocchetta, [......],
P Santangelo,
B Sciascia,
A Sibidanov,
T Spadaro,
M Testa,
L Tortora,
P Valente,
G Venanzoni,
R Versaci,
Speaker
[show abstract]
[hide abstract]
ABSTRACT: While measuring the ratio R K = Γ(K ± e2(γ))/Γ(K ± µ2(γ)), the KLOE Collaboration has studied the radiative process K e2γ . The ratio of the width for the K e2γ decay with a positively polarized photon from structure-dependent radiation to the inclusive K µ2(γ) width is found to be 1.484(68) × 10 −5 . The observed radiation spectrum agrees with predictions from chiral perturbation theory and is in contrast with predictions based on the light front quark model. This result reduces the contribution to systematic uncertainties on measurements of R K . In a separate study, KLOE has measured the ratio of the radiative K e3γ decay width to the inclusive K e3(γ) width to be 924(28) × 10 −5 . The distribution in energy and angle of the radiative photon has been analyzed in an attempt to isolate the signature from interference of the inner-bremsstrahlung and structure-dependent amplitudes.
PoS. 11/2009;
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KLOE collaboration,
F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
P. Beltrame,
G. Bencivenni,
S. Bertolucci,
C. Bini,
C. Bloise, [......],
V. Patera,
P. Santangelo,
B. Sciascia,
T. Spadaro,
M. Testa,
L. Tortora,
P. Valente,
G. Venanzoni,
R.Versaci,
G. Xu
[show abstract]
[hide abstract]
ABSTRACT: We update the values of the η-η' mixing angle and of the η' gluonium content by fitting our measurement R = BR( → η'γ)/BR( → ηγ) together with several vector meson radiative decays to pseudoscalars (V → Pγ), pseudoscalar mesons radiative decays to vectors (P → Vγ) and the η' → γγ, π0 → γγ widths. From the fit we extract a gluonium fraction of ZG2 = 0.12±0.04, the pseudoscalar mixing angle ψP = (40.4±0.6)° and the −ω mixing angle ψV = (3.32±0.09)°. ZG2 and ψP are fairly consistent with those previously published. We also evaluate the impact on the η' gluonium content determination of future experimental improvements of the η' branching ratios and decay width.
Journal of High Energy Physics 07/2009; 2009(07):105. · 5.83 Impact Factor
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KLOE Collaboration,
F. Ambrosino,
A Antonelli,
M Antonelli,
F. Archilli,
C Bacci,
P. Beltrame,
G Bencivenni,
S. Bertolucci,
C. Bini, [......],
A. Sciubba,
A. Sibidanov,
T. Spadaro,
M Testa,
L Tortora,
P. Valente,
G. Venanzoni,
R. Versaci,
R Volpe,
G Xu
[show abstract]
[hide abstract]
ABSTRACT: We have studied the phi->a_0(980) gamma process with the KLOE detector at the Frascati phi-factory DAPhNE by detecting the phi->eta pi^0 gamma decays in the final states with eta->gamma gamma and eta->pi^+ pi^- pi^0. We have measured the branching ratios for both final states: Br(phi->eta pi^0 gamma)=(7.01 +/- 0.10 +/- 0.20)x10^-5 and (7.12 +/- 0.13 +/- 0.22)x10^-5 respectively. We have also extracted the a_0(980) mass and its couplings to eta pi^0, K^+ K^-, and to the phi meson from the fit of the eta pi^0 invariant mass distributions using different phenomenological models. Comment: 17 pages, 6 figures, submitted to Physics Letters B. Corrected typos in eq.9
04/2009;
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KLOE Collaboration,
F. Ambrosino,
A Antonelli,
M Antonelli,
F. Archilli,
P. Beltrame,
G Bencivenni,
S. Bertolucci,
C. Bini,
C. Bloise, [......],
V. Patera,
P. Santangelo,
B. Sciascia,
T. Spadaro,
M Testa,
L Tortora,
P. Valente,
G. Venanzoni,
R. Versaci,
G Xu
[show abstract]
[hide abstract]
ABSTRACT: We have searched for the decay phi -> K0 K0bar gamma, by detecting K_s pairs plus a photon and with the K_s-mesons decaying to pi^+ pi^-, in a sample of about 1.5x 10^9 phi-decays collected by the KLOE experiment at DAFNE. The reaction proceeds through the intermediate states f_0(980) gamma, a_0(980) gamma. We find five events with 3.2 events expected from background processes. We obtain the upper limit: BR (phi -> K0 K0bar gamma) < 1.9x10^-8 at 90% C.L. . Comment: 11 pages, 8 figures, submitted to Physics Letters B
Physics Letters B 03/2009; · 3.95 Impact Factor
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F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
P. Beltrame,
G. Bencivenni,
S. Bertolucci,
C. Bini,
C. Bloise,
S. Bocchetta, [......],
P. Santangelo,
B. Sciascia,
T. Spadaro,
M. Testa,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci,
G. Xu, Kloe Collaboration
J. High Energy Phys. 01/2009;
-
F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
P. Beltrame,
G. Bencivenni,
C. Bini,
C. Bloise,
S. Bocchetta,
F. Bossi, [......],
V. Patera,
P. Santangelo,
B. Sciascia,
A. Sibidanov,
T. Spadaro,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci, Kloe Collaboration
European Physical Journal C 01/2009; 64:627. · 3.63 Impact Factor
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F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
P. Beltrame,
G. Bencivenni,
C. Bini,
C. Bloise,
S. Bocchetta,
F. Bossi, [......],
V. Patera,
P. Santangelo,
B. Sciascia,
A. Sibidanov,
T. Spadaro,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci, Kloe Collaboration
Eur. Phys. J. C. 01/2009; 64:627-636.
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F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
P. Beltrame,
G. Bencivenni,
S. Bertolucci,
C. Bini,
C. Bloise,
S. Bocchetta, [......],
P. Santangelo,
B. Sciascia,
T. Spadaro,
M. Testa,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci,
G. Xu, Kloe Collaboration
Physics Letters B 01/2009; 679:10-14. · 3.95 Impact Factor
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F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
R. Beltrame,
G. Bencivenni,
S. Bertolucci,
C. Bini,
C. Bloise,
S. Bocchetta, [......],
B. Sciascia,
A. Sciubba,
A. Sibidanov,
T. Spadaro,
M. Testa,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci, Kloe Collaboration
Physics Letters B 01/2009; 672:203-208. · 3.95 Impact Factor
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F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
C. Bacci,
P. Beltrame,
G. Bencivenni,
S. Bertolucci,
C. Bini,
C. Bloise, [......],
A. Sciubba,
A. Sibidanov,
T. Spadaro,
M. Testa,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci,
G. Xu, Kloe Collaboration
Nucl. Phys. B-Proc. Suppl. 01/2009; 186:290-293.
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KLOE Collaboration,
F. Ambrosino,
A Antonelli,
M Antonelli,
F. Archilli,
P. Beltrame,
G Bencivenni,
S. Bertolucci,
C. Bini,
C. Bloise, [......],
F. Perfetto,
P. Santangelo,
B. Sciascia,
T. Spadaro,
M Testa,
L Tortora,
P. Valente,
G. Venanzoni,
R. Versaci,
G Xu
[show abstract]
[hide abstract]
ABSTRACT: We have studied the eta->pi+pi-e+e-(gamma) decay using about 1.7 fb^-1 collected by the KLOE experiment at the DAFNE phi-factory. This corresponds to about 72 millions eta mesons produced in phi radiative decays. We have measured the branching ratio, inclusive of radiative effects, with 4% accuracy: BR(eta->pi+pi-e+e-(gamma)) = (26.8 +/- 0.9_Stat. +/- 0.7_Syst.) x 10^-5. We have obtained the first measurement of the CP-odd pipi-ee decay planes angular asymmetry, A_phi = (-0.6 +/- 2.5_Stat. +/- 1.8_Syst.) x 10^-2. Comment: 13 Pages, 6 figures, accepted for publication in Physics Letter B. Minor changes after journal review.
Physics Letters B 12/2008; · 3.95 Impact Factor
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F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
C. Bacci,
P. Beltrame,
G. Bencivenni,
S. Bertolucci,
C. Bini,
C. Bloise, [......],
A. Sciubba,
A. Sibidanov,
T. Spadaro,
M. Testa,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci,
G. Xu, Kloe Collaboration
Physics Letters B 01/2008; 666:305-310. · 3.95 Impact Factor
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S. Meola,
F. Ambrosino,
A. Antonelli,
M. Antonelli,
F. Archilli,
C. Bacci,
P. Beltrame,
G. Bencivenni,
S. Bertolucci,
C. Bini, [......],
F. Scuri,
I. Sfiligoi,
T. Spadaro,
M. Testa,
L. Tortora,
P. Valente,
G. Venanzoni,
R. Versaci,
G. Xu, Kloe Collaboration
01/2008: pages 151-157; , ISBN: 978-88-470-0746-8
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01/2008; 31:531-623.
