E. Campagna

Learn More
A stochastic background of gravitational waves is expected to arise from a superposition of a large number of unresolved gravitational-wave sources of astrophysical and cosmological origin. It should carry unique signatures from the earliest epochs in the evolution of the Universe, inaccessible to standard astrophysical observations. Direct measurements of(More)
The inclusive production of charmonium mesons in B meson decay has been studied in a 20.3 fb −1 data set collected by the BABAR experiment operating at the Υ (4S) resonance. Branching fractions have been measured for the inclusive production of the charmonium mesons J/ψ , ψ(2S), χc1, and χc2. The branching fractions are also presented as a function of the(More)
The gravitational-wave (GW) sky may include nearby pointlike sources as well as stochastic backgrounds. We perform two directional searches for persistent GWs using data from the LIGO S5 science run: one optimized for pointlike sources and one for arbitrary extended sources. Finding no evidence to support the detection of GWs, we present 90% confidence(More)
We present a search for gravitational waves from 116 known millisecond and young pulsars using data from the fifth science run of the LIGO detectors. For this search, ephemerides overlapping the run period were obtained for all pulsars using radio and X-ray observations. We demonstrate an updated search method that allows for small 674 ABBOTT ET AL. Vol.(More)
We present a measurement of time-dependent CP asymmetries and an updated determination of the CP-odd fraction in the decay B 0 → D * + D * −. The measurements are derived from a data sample of 88 × 10 6 B ¯ B pairs collected by the BABAR detector at the PEP-II energy asymmetric B Factory at SLAC. All results are preliminary.
VIRGO, a French-Italian collaboration located in Cascina (Pisa, Italy) aiming at the detection of gravitational waves, is a ground based power recycled Michelson interferometer, which arms are 3-km-long Fabry-Perot suspended cavities. The VIRGO first scientific data taking has started in mid may 2007 in coincidence with the corresponding American detectors.(More)
A search for the exclusive radiative decays B → ρ(770)γ and B 0 → ω(782)γ is performed on a sample of 84 million BB events collected by the BABAR detector at the P EP − II asymmetric e + e − collider. No significant signal is seen in any of the channels. We set preliminary upper limits of B[B 0 → ρ 0 γ] < 1.4 × 10 −6 , B[B + → ρ + γ] < 2.3 × 10 −6 and B[B 0(More)
We report preliminary measurements of the branching fractions for B + → J/ψφK + , B 0 → J/ψφK 0 S , B 0 → J/ψφ, B 0 → J/ψη and B 0 → J/ψη ′ using 56 million B ¯ B events collected at the Υ (4S) resonance with the BABAR detector at PEP-II. We measure branching fractions of B(B + → J/ψφK +)= (4.4 ± 1.4(stat) ± 0.7(syst))×10 −5 and B(B 0 → J/ψφK 0 S)=(5.1 ±(More)
— The French-Italian interferometric gravitational wave detector VIRGO is currently being commissioned. Its principal instrument is a Michelson laser interferometer with 3 km long optical cavities in the arms and a power-recycling mirror. The interferometer resides in an ultra-high vacuum system and the mirrors are suspended from multistage pendulums for(More)