Dr. Roberto Versaci

Extreme Light Infrastructure Beamlines, Dolní Břežany, Czech Republic

Dr. Roberto Versaci

Extreme Light Infrastructure Beamlines, Dolní Břežany, Czech Republic

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Academic Career Length

24Years (2003-Present)

(Calculated once Scilit publication data is synced: current year − year of first publication + 1)

Representative Publications

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1 January 2012 in Physics Letters B

Journal Article

Search for a vector gauge boson in ϕ meson decays with the KLOE detector

F. Archilli

D. Babusci

D. Badoni

I. Balwierz

G. Bencivenni

J. Zdebik

+71

"The existence of a light dark force mediator has been tested with the KLOE detector at DA��NE. This particle, called U, is searched for using the decay chain φ → ηU, η → π+π−π0, U → e+e−. No evidence is found in 1.5 fb−1 of data. The resulting exclusion plot covers the mass range 5 < MU < 470 MeV, setting an upper limit on the ratio between the U boson coupling constant and the fine structure constant, α′\/α, of ��2×10−5 at 90% C.L. for 50

25 February 2013 in The European Physical Journal A

Journal Article

Performance of the neutron time-of-flight facility n_TOF at CERN

Carlos Guerrero

A. Tsinganis

E. Berthoumieux

M. Barbagallo

F. Belloni

PŽ

P. Žugec

+106

The neutron time-of-flight facility n_TOF features a white neutron source produced by spallation through 20GeV/ cprotons impinging on a lead target. The facility, aiming primarily at the measurement...

1 June 2011 in Physics Letters B

Journal Article

Measurement of

σ (e^{+} e^{-} \to π^{+} π^{-})

from threshold to 0.85 GeV2 using initial state radiation with the KLOE detector

F. Ambrosino

F. Archilli

P. Beltrame

G. Bencivenni

C. Bini

Roberto Versaci

+41

"We have measured the cross section of the radiative process e(+)e(-) -> pi(+)pi(-)gamma with the KLOE detector at the Frascati phi-factory DA(1)NE, 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 vertical bar F-pi vertical bar(2) and the dipion contribution to the muon magnetic moment anomaly, Delta alpha(pi pi)(mu) = (478.5 +\/- 2.0(stat) +\/- 5.0(syst) +\/- 4.5(th)) x 10(-10) in the range 0.1 < M-pi pi(2) <0.85 GeV2, where the theoretical error includes a SU(3) chi PT estimate of the uncertainty on photon radiation from the final pions. The discrepancy between the Standard Model evaluation of alpha(mu) and the value measured by the Muon g-2 collaboration at BNL is confirmed. (C) 2011 Elsevier B.V. All rights reserved. RI Fiore, Salvatore\/C-9722-2011; Di Domenico, Antonio\/G-6301-2011; De Lucia, Erika\/D-2250-2011; branchini, paolo\/A-4857-2011