42 research outputs found
Neutrino experiments in Physics Department of Rome Sapienza University
This paper describes the history of experimental neutrino physics in the
physics department of Rome Sapienza Universit
History of accelerator neutrino beams
Neutrino beams obtained from proton accelerators were first operated in 1962.
Since then, neutrino beams have been intensively used in particle physics and
evolved in many different ways. We describe the characteristics of various
neutrino beams, relating them to the historical development of the physics
studies and discoveries. We also discuss some of the ideas still under
consideration for future neutrino beams.Comment: 37 pages, 15 figure
The K2K SciBar Detector
A new near detector, SciBar, for the K2K long-baseline neutrino oscillation
expe riment was installed to improve the measurement of neutrino energy
spectrum and to study neutrino interactions in the energy region around 1 GeV.
SciBar is a 'fully active' tracking detector with fine segmentation consisting
of plastic scintillator bars. The detector was constructed in summer 2003 and
is taking data since October 2003. The basic design and initial performance is
presented.Comment: 7 pages, 4figures, Contributed to Proceedings of the 10th Vienna
Conference on Instrumentation, Vienna, February 16-21, 200
Measurement of charm production in neutrino charged-current interactions
The nuclear emulsion target of the CHORUS detector was exposed to the
wide-band neutrino beam of the CERN SPS of 27 GeV average neutrino energy from
1994 to 1997. In total about 100000 charged-current neutrino interactions with
at least one identified muon were located in the emulsion target and fully
reconstructed, using newly developed automated scanning systems. Charmed
particles were searched for by a program recognizing particle decays. The
observation of the decay in nuclear emulsion makes it possible to select a
sample with very low background and minimal kinematical bias. 2013
charged-current interactions with a charmed hadron candidate in the final state
were selected and confirmed through visual inspection. The charm production
rate induced by neutrinos relative to the charged-current cross-section is
measured to be sigma(nu_mu N -> mu- C X)/sigma(CC) = (5.75 +-0.32 stat +-0.30
syst)%. The charm production cross-section as a function of the neutrino energy
is also obtained. The results are in good agreement with previous measurements.
The charm-quark hadronization produces the following charmed hadrons with
relative fractions (in %): f_Dzero = 43.7+-4.5, f_Lambda_c^plus = 19.2+-4.2,
f_Dplus = 25.3+-4.2, and f_D_splus = 11.8+-4.7.Comment: 16 pages, 5 figure
Measurement of the Weinberg angle in neutrino interactions
Neutrino physics with high energy neutrino beams has played a crucial role in
establishing the Standard Model of the electroweak interaction, in particular with
repeated measurements of increasing precision of the fundamental parameter sin2 θW which defines the
electroweak mixing. This paper relates the history of these measurements, from the
discovery of the neutral current interaction in 1973 until the latest high precision
measurements in the years 2000. The review discusses in chronological order the important
experiments performed at CERN, Fermilab and Brookhaven during the last thirty years of the
20th century
The High Resolution Calorimeter of CHORUS Experiment.
The CHORUS Collaboration is presently building a new detector for the search of vμ−vτ oscillations on the CERN neutrino beam, this experiment being sensitive to a mixing angle an order of magnitude smaller than previous experiments. The basic components of the CHORUS “hybrid” detector are an active target made of nuclear emulsions (for the direct observation of the decay of τ-leptons), an air-core spectrometer with scintillating fiber tracking, a lead-scintillator (fibers and strips) calorimeter (with μ-tracking provided by planes of limited streamer tubes) and a muon spectrometer, consisting of iron toroids and drift chambers. We report here on the design of the calorimeter and on the tests performed on prototype modules
Search for Single Photon Direct Production in p+p Collisions at √s=53.2 GeV
We report the results of an experiment made at the CERN ISR to investigate the possible diret production of single photons in pp collisions at √s = 53.2 GeV at 90° and in the pt interval 2.3 to 5.7 GeV/c. The value of the ratio R = nγ/nπ0 is compatible with zero for low pt ⪅ 3 GeV/c but, in spite of the large error, shows a trend to increase for larger pt
Comparison of Direct Photon Production in pp Collision at √s = 30.6 GeV and 53.2 GeV
We present data obtained at the ISR, on the determination of the ratio of photons and pi0 at 30.6 and 53.2 GeV center of mass and we compare the results with our previous measurement at View the MathML source GeV. The ratio View the MathML source integrated over the interval 0.1 ⩽ χT ⩽ 0.2 is (1.6 ± 0.5) × 10−2 and we obtain an indication of a universal χT dependence