739 research outputs found
Beam test results of 3D fine-grained scintillator detector prototype for a T2K ND280 neutrino active target
An upgrade of the long baseline neutrino experiment T2K near detector ND280
is currently being developed with the goal to reduce systematic uncertainties
in the prediction of number of events at the far detector Super-Kamiokande. The
upgrade program includes the design and construction of a new highly granular
fully active scintillator detector with 3D WLS fiber readout as a neutrino
target. The detector of about in size and a mass
of 2.2~tons will be assembled from about plastic
scintillator cubes of . Each cube is read out by three
orthogonal Kuraray Y11 Wave Length Shifting (WLS) fibers threaded through the
detector. A detector prototype made of 125 cubes was assembled and tested in a
charged particle test beam at CERN in the fall of 2017. This paper presents the
results obtained on the light yield and timing as well as on the optical
cross-talk between the cubes.Comment: 5 pages, 8 figure
Proposal for SPS beam time for the baby MIND and TASD neutrino detector prototypes
The design, construction and testing of neutrino detector prototypes at CERN
are ongoing activities. This document reports on the design of solid state baby
MIND and TASD detector prototypes and outlines requirements for a test beam at
CERN to test these, tentatively planned on the H8 beamline in the North Area,
which is equipped with a large aperture magnet. The current proposal is
submitted to be considered in light of the recently approved projects related
to neutrino activities with the SPS in the North Area in the medium term
2015-2020
First measurement of the T-violating muon polarization in the decay K^+ --> mu^+ nu gamma
We present the result of the first measurement of the T-violating muon
polarization P_T in the decay K^+ --> mu^+ nu gamma. This polarization is
sensitive to new sources of CP-violation in the Higgs sector. Using data
accumulated in the period 1996-98 we have obtained P_T = (-0.64 +- 1.85(stat)
+- 0.10(syst))x10^{-2} which is consistent with no T-violation in this decay.Comment: 11 pages, 8 figure
A new limit of T-violating transverse muon polarization in the decay
A search for T-violating transverse muon polarization () in the
decay was performed using kaon decays at rest. A
new improved value, , was
obtained giving an upper limit, . The T-violation parameter
was determined to be Im giving
an upper limit, Im.Comment: 5 pages, 4 figure
Measurement of K^+ \to \pi^0 \mu^+ \nu \gamma decay using stopped kaons
The K^+ \to \pi^0 \mu^+ \nu \gamma () decay has been
measured with stopped positive kaons at the KEK 12 GeV proton synchrotron. A
sample containing 125 events was obtained. The partial
branching ratio was found to be , which is in good agreement with theoretical predictions.Comment: 12 pages, 3 figures, to be published in Physics Letters
Apparatus for a Search for T-violating Muon Polarization in Stopped-Kaon Decays
The detector built at KEK to search for T-violating transverse muon
polarization in K+ --> pi0 mu+ nu (Kmu3) decay of stopped kaons is described.
Sensitivity to the transverse polarization component is obtained from
reconstruction of the decay plane by tracking the mu+ through a toroidal
spectrometer and detecting the pi0 in a segmented CsI(Tl) photon calorimeter.
The muon polarization was obtained from the decay positron asymmetry of muons
stopped in a polarimeter. The detector included features which minimized
systematic errors while maintaining high acceptance.Comment: 56 pages, 30 figures, submitted to NI
Measurement of direct photon emission in decay using stopped positive kaons
The radiative decay () has
been measured with stopped positive kaons. A sample
containing 4k events was analyzed, and the branching ratio
of the direct photon emission process was determined to be . No interference pattern with internal
bremsstrahlung was observed.Comment: 12 pages, 6 figures, 2 tables, to be published in Phys. Lett.
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