19 research outputs found
Proposal for taking data with the KLOE-2 detector at the DANE collider upgraded in energy
This document reviews the physics program of the KLOE-2 detector at
DANE upgraded in energy and provides a simple solution to run the
collider above the -peak (up to 2, possibly 2.5 GeV). It is shown how a
precise measurement of the multihadronic cross section in the energy region up
to 2 (possibly 2.5) GeV would have a major impact on the tests of the Standard
Model through a precise determination of the anomalous magnetic moment of the
muon and the effective fine-structure constant at the scale. With a
luminosity of about cms, DANE upgraded in energy
can perform a scan in the region from 1 to 2.5 GeV in one year by collecting an
integrated luminosity of 20 pb (corresponding to a few days of data
taking) for single point, assuming an energy step of 25 MeV. A few years of
data taking in this region would provide important tests of QCD and effective
theories by physics with open thresholds for pseudo-scalar (like
the ), scalar (, etc...) and axial-vector (, etc...)
mesons; vector-mesons spectroscopy and baryon form factors; tests of CVC and
searches for exotics. In the final part of the document a technical solution
for the energy upgrade of DANE is proposed.Comment: 19 pages, 8 figure
KLOE results in kaon physics and prospects for KLOE-2
The phi-factory DAPHNE offers a possibility to select pure kaon beams,
charged and neutral ones. In particular, neutral kaons from phi->KS KL are
produced in pairs and the detection of a KS (KL) tags the presence of a KL
(KS). This allows to perform precise measurements of kaon properties by means
of KLOE detector. Another advantage of a phi-factory consists in fact that the
neutral kaon pairs are produced in a pure quantum state (J^(PC) = 1^(--)),
which allowsto investigate CP and CPT symmetries via quantum interference
effects, as well as the basic principles of quantum mechanics.A review of the
most recent results of the KLOE experiment at DAPHNE using pure kaon beams or
via quantum interferometry is presented together with prospects for kaon
physics at KLOE-2.Comment: 5 pages, 4 figures, From Phi To Psi 2011 conference, to be published
in Nuclear Physics B (Proceedings Supplements
On the possibility to measure the (pi0 to gamma gamma) decay width and the (gamma* gamma to pi0) transition form factor with the KLOE-2 experiment
A possibility of KLOE-2 experiment to measure the width Gamma(pi0 to gamma
gamma) and the (pi0 gamma gamma*) form factor F(Q^2) at low invariant masses of
the virtual photon in the space-like region is considered. This measurement is
an important test of the strong interaction dynamics at low energies. The
feasibility is estimated on the basis of a Monte-Carlo simulation. The expected
accuracy for Gamma(pi0 to gamma gamma) is at a per cent level, which is better
than the current experimental world average and theory. The form factor will be
measured for the first time at Q^2 less or equal 0.1 GeV^2 in the space-like
region. The impact of these measurements on the accuracy of the pion-exchange
contribution to the hadronic light-by-light scattering part of the anomalous
magnetic moment of the muon is also discussed.Comment: 2-column style; matches the revision accepted by EPJ
Measurement of with KLOE experiment
We report the measurement of the ratio analyzing a large sample of
decays recorded with the KLOE experiment at the
DANE collider, corresponding to an integrated luminosity of 558
pb. The process is supposed to proceed both
via a resonant contribution, mediated by the meson, and a non resonant
direct term, connected to the box anomaly. The presence of the direct term
affects the partial width value. Our result is in agreement with a recent CLEO measurement, which differs by
more 3 from the average of previous results
Physics topics at KLOE-2
The goal of the KLOE-2 experiment operating at the upgraded DA{\Phi}NE
e+e-collider is to collect an integrated luminosity of about 20 fb-1 during 3-4
years of running. Measurements using the KLOE-2 apparatus equipped with the
inner tracker, new scintillation calorimeters and tagging detectors for
gamma-gamma physics will allow to refine and extend the KLOE program on kaon
physics and tests of fundamental symmetries as well as the quantum
interferometry. Here the latest results from KLOE data analysis and
perspectives at KLOE-2 are presented.Comment: Proceedings of the EXA2011 conference,1 figure, 5 pages, be published
in Hyperfine Interaction
Observation of the rare eta->e+e-e+e- decay with the KLOE experiment
We report the first observation of the rare eta->e+e-e+e- decay based on 1.7
fb^{-1} collected by the KLOE experiment at the DAFNE 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}.Comment: 12 pages, 3 figures, to be published on PL
Search for a vector gauge boson in phi meson decays with the KLOE detector
The existence of a light dark force mediator has been tested with the KLOE
detector at DAPHNE. This particle, called U, is searched for using the decay
chain phi-->etaU, eta-->pi+pi-pi0, U-->e+e-. No evidence is found in 1.5 fb-1
of data. The resulting exclusion plot covers the mass range 5<M_U<470 MeV,
setting an upper limit on the ratio between the U boson coupling constant and
the fine structure constant, alpha'/alpha, of <= 2x10^-5 at 90% C.L. for
50<M_U<420 MeV.Comment: 13 pages, 8 figure