44 research outputs found
Limit on the production of a new vector boson in , U with the KLOE experiment
The recent interest in a light gauge boson in the framework of an extra U(1)
symmetry motivates searches in the mass range below 1 GeV.
We present a search for such a particle, the dark photon, in , U based on 28 million
events collected at DANE
by the KLOE experiment. The production by initial-state radiation
compensates for a loss of sensitivity of previous KLOE , searches due to the small branching ratios in
the resonance region. We found no evidence for a signal and set a
limit at 90\% CL on the mixing strength between the photon and the dark photon,
, in the U mass range between and ~MeV. Above 700 MeV
this new limit is more stringent than previous ones.Comment: 6 pages, 9 figures, 1 table, submitted to Phys. Lett.
Measurement of the transition form factor with the KLOE detector
A measurement of the vector to pseudoscalar conversion decay with the KLOE experiment is presented. A sample of signal
events was selected from a data set of 1.7 fb of collisions at
collected at the DANE collider. These
events were used to obtain the first measurement of the transition form factor
and a new measurement of the branching ratio of the
decay: . The result improves
significantly on previous measurements and is in agreement with theoretical
predictions.Comment: 13 pages, 4 figures; matches published versio
Precision measurement of the Dalitz plot distribution with the KLOE detector
Using fb of data collected with
the KLOE detector at DANE, the Dalitz plot distribution for the decay is studied with the world's largest sample of events. The Dalitz plot density is parametrized as a polynomial
expansion up to cubic terms in the normalized dimensionless variables and
. The experiment is sensitive to all charge conjugation conserving terms of
the expansion, including a term. The statistical uncertainty of all
parameters is improved by a factor two with respect to earlier measurements.Comment: 11 pages, 9 figures, supplement: an ascii tabl
MesonNet 2014 International Workshop. Mini-proceedings
The MesonNet International Workshop was held in the Laboratori Nazionali di Frascati from September the 29th to October the 1st, 2014, being the concluding meeting of the MesonNet research network within EU HadronPhysics3 project. MesonNet is a research network focused on light meson physics gathering experimentalist and theoreticians from Europe and abroad. An overview of the research projects related to the scope of the network is presented in these mini-proceedings
MesonNet 2014 International Workshop. Mini-proceedings
The MesonNet International Workshop was held in the Laboratori Nazionali di
Frascati from September the 29th to October the 1st, 2014, being the concluding
meeting of the MesonNet research network within EU HadronPhysics3 project.
MesonNet is a research network focused on light meson physics gathering
experimentalist and theoreticians from Europe and abroad. An overview of the
research projects related to the scope of the network is presented in these
mini-proceedings.Comment: 93 pages, 12 figures, MesonNet 2014 International Workshop, 29/9 -
1/10 Frascati LNF INF
Quantum mechanics and CPT tests with neutral kaons at the KLOE experiment
Neutral kaons produced in the correlated pairs at the DAΦNE -factory offer unique possibilities to perform fundamental tests of CPT invariance, as well as of the basic principles of quantum mechanics. The analysis of the data collected by the KLOE experiment allows to improve results on several parameters describing CPT violation and decoherence, and to measure the regeneration cross section on the beam pipe materials
Search for light vector boson production in interactions with the KLOE experiment
We have searched for a light vector boson , the possible carrier of a
"dark force", with the KLOE detector at the DANE \epm\ collider,
motivated by astrophysical evidence for the presence of dark matter in the
universe. Using \epm\ collisions collected with an integrated luminosity of
~pb, we look for a dimuon mass peak in the reaction \epm\to\gam, corresponding to the decay . We find no evidence
for a vector boson signal. We set a 90\% CL upper limit for the mixing
parameter squared between the photon and the boson of 1.610
to 8.610 for the mass region MeV.Comment: 12 pages, 7 figures, version accepted for publication in Physics
Letters