9,853 research outputs found
Atmospheric neutrino oscillations in MACRO
In this paper we first give a short overview of the MACRO detector, which was
operational at the Gran Sasso Laboratory from 1989 till 2000. Then we present
and discuss the results on atmospheric neutrino oscillations, concerning medium
(~4 GeV) and high (~50 GeV) energy data. Using the Multiple Coulomb Scattering
of muons inside the lower part of the detector, estimates of neutrino energies
were made for the high energy sample. The MACRO data, angular distributions,
absolute flux and L/E_nu distributions favour nu_mu nu_tau oscillations
with maximal mixing and Dm^2=2.5 x 10^-3 eV^2.Comment: 13 pages, 11 EPS figures included with epsfig, uses article.sty. Talk
given at NO-VE, Int. Workshop on Neutrino Oscillations in VEnice, Venice,
Italy, 24-26 July 2001. Fig. 9 updated, Ref. 9 changed and content changed in
Sect. 6,
Atmospheric neutrino oscillations
The latest results from the Soudan 2, MACRO and SuperKamiokande experiments
on atmospheric neutrino oscillations are summarised and discussed. In
particular a discussion is made on the Monte Carlo simulations used for the
atmospheric neutrino flux.Comment: 11 pages,10 EPS figures,added references. Lecture given at the 7th
School on Non-Accelerator Astroparticle Physics, Trieste, Italy, 200
Bose Einstein correlations of neutral pion pairs at LEP
With the OPAL detector at LEP we measured at energies around the Z0 peak the
Bose-Einstein Correlations (BECs) of neutral pion pairs. We compare the results
of this measurement with former results obtained at LEP for hadrons including
those obtained from Fermi-Dirac Correlations (FDCs).Comment: 4 pages, PDF format. Talk given by G. Giacomelli at DPF 2003,
Philadelphia, USA, 5-8 April 200
The CNGS Neutrino Beam
The CERN to Gran Sasso Neutrino beam (CNGS) was commissioned at CERN in early
August 2006 and was first sent at low intensity to Gran Sasso on August 17,
2006. The Borexino, LVD and OPERA experiments continued the commissioning of
their detectors and started taking data with practically no dead time. The CNGS
collected several hundred events with clean time distributions.Comment: 11 pages, 14 EPS figures. Lecture given at the 2nd Latin American
School on Cosmic Rays and Astrophysics, Puebla, Mexico, 30th August - 8th
September 200
Bose-Einstein Correlations in Multihadron Events at LEP
Bose-Einstein correlations in pairs of identical particles were analyzed in
e+ e- multihadron annihilations at ~91.2 GeV at LEP. The first studies involved
identical charged pions and the emitting source size was determined. Then the
study of charged kaons suggested that the radius depends on the mass of the
emitted particles. Subsequenty the dependence of the source radius on the event
multiplicity was analyzed. The study of the correlations in neutral pions and
neutral kaons extended these concepts to neutral particles. The shape of the
source was analyzed in 3 dimensions and was found not to be spherically
symmetric. In recent studies at LEP the correlations were analyzed in intervals
of the average pair transverse momentum and of the pair rapidity to study the
correlations between the pion production points and their momenta
(position-momentum correlations). The latest e+ e- data are consistent with an
expanding source.Comment: 8 pages, 10 eps figures. Invited paper at the ``Ninth Workshop on Non
Perturbative QCD'', Institut d'Astrophysique de Paris, Paris, France, 4-8
June 200
New calibrations and time stability of the response of the INTERCAST CR-39
We present new calibrations of different production batches (from 1989 to
1999) of the INTERCAST CR-39, using the BNL-AGS 1 A GeV iron beam. The
comparison with previous results, obtained with the 158 A GeV lead beam from
the CERN-SPS shows that, while each production batch has a different
calibration curve (mainly due to minor differences in the production
conditions), the aging effect is negligible. We also tested the dependence of
the CR-39 response from the time elapsed between exposure and analysis (fading
effect). The fading effect, if present, is less than 10%. It may be compatible
with the experimental uncertainties on the bulk etching rate vB.Comment: 9 pages, 4 EPS figures, .pdf file. Talk presented by M. Giorgini at
the 20 Int. Conf. on Nuclear Tracks in Solids, Portoroz (Slovenia), Aug
28-Sep 1, 200
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