The MEMPHYS project Borne, J.L.; Busto, J.; Campagne, J.-E. ...
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
05/2011, Letnik:
639, Številka:
1
Journal Article
Recenzirano
MEMPHYS is a proposed 0.5
Mton scale Water Cherenkov experiment to be performed deep underground. Possible sites are under study in the European FP7 design study LAGUNA. It is dedicated to nucleon ...decay, neutrinos from supernovæ, solar and atmospheric neutrinos, as well as neutrinos from a future Super-Beam or
β-Beam to measure the mixing angle
θ
13, the CP violating phase
δ and the mass hierarchy. A small-scale prototype, Memphyno, has been constructed with the purpose of serving as a test bench for new photodetection and data acquisition solutions, such as grouped readout system.
The Microstrip Silicon tracker of the CMS detector is designed to provide robust particle tracking and vertex reconstruction within a strong magnetic field in the high luminosity environment of the ...LHC. The Tracker readout system employs Front-End Driver cards to digitize and buffer the analogue data arriving via optical links from on detector pipeline chips. The control Chain of the front-end electronic is built to operate via optical fibers in order to shield the communications from the outside noise. Components close to the final design have been assembled to be tested in the X5 beam area at CERN where a dedicated 25
ns temporal structure beam has been made available by the SPS. This paper describes the hardware and the software developed for readout and control of data acquired by the front-end electronics operating at 40
MHz. Some preliminary results of the tests performed in the 25
ns beam are also given.
η-helium quasi-bound states Willis, N.; Le Bornec, Y.; Zghiche, A. ...
Physics letters. B,
07/1997, Letnik:
406, Številka:
1
Journal Article
Recenzirano
Odprti dostop
The cross section and tensor analysing power
t
20 of the
dd →
4
Heη
reaction have been measured at six c.m. momenta, 10 ⩽
p
η
⩽ 90 MeV/
c. The threshold value of
t
20 is consistent with
1
2
, which ...follows from parity conservation and Bose symmetry. The much slower momentum variation observed for the reaction amplitude, as compared to that for the analogous
pd →
3
Heη
case, strongly suggests the existence of a quasi-bound state in the η
4He system and simple optical model fits tentatively indicate that this might also be the case for η
3He.
A
bstract
A first result of the search for
ν
μ
→
ν
e
oscillations in the OPERA experiment, located at the Gran Sasso Underground Laboratory, is presented. The experiment looked for the appearance of
...ν
e
in the CNGS neutrino beam using the data collected in 2008 and 2009. Data are compatible with the non-oscillation hypothesis in the three-flavour mixing model. A further analysis of the same data constrains the non-standard oscillation parameters
θ
new
and
suggested by the LSND and MiniBooNE experiments. For large
values (
>
0.1 eV
2
), the OPERA 90% C.L. upper limit on sin
2
(2
θ
new
) based on a Bayesian statistical method reaches the value 7
.
2 × 10
−3
.
A
bstract
The OPERA neutrino experiment is designed to perform the first observation of neutrino oscillations in direct appearance mode in the
ν
μ
→
ν
τ
channel, via the detection of the
τ
-leptons ...created in charged current ν
τ
interactions. The detector, located in the underground Gran Sasso Laboratory, consists of an emulsion/lead target with an average mass of about 1.2 kt, complemented by electronic detectors. It is exposed to the CERN Neutrinos to Gran Sasso beam, with a baseline of 730 km and a mean energy of 17 GeV. The observation of the first
ν
τ
candidate event and the analysis of the 2008-2009 neutrino sample have been reported in previous publications. This work describes substantial improvements in the analysis and in the evaluation of the detection efficiencies and backgrounds using new simulation tools. The analysis is extended to a sub-sample of 2010 and 2011 data, resulting from an electronic detector-based pre-selection, in which an additional
ν
τ
candidate has been observed. The significance of the two events in terms of a
ν
μ
→
ν
τ
oscillation signal is of 2.40
σ
.
The polarization transfer
κ
0 and the tensor analyzing power
T
20 for the
1H
dp)d
reaction have been measured up to an internal momentum of
k = 0.58 GeV/c. Comparison of the same observables obtained ...in recent studies for
1H
dp)d
reaction, as a function of
k, show different behavior. However the data from these two reactions are almost identical when compared in
T
20 versus
κ
0 correlation plots. We discuss similarities and differences observed in the two reactions.
We present an updated measurement of time-dependent C P asymmetries and the C P -odd fraction in the decay B 0 → D * + D * − using 232 × 10 6 B ¯¯¯ B pairs collected by the BABAR detector at the SLAC ...PEP-II B factory. We determine the C P -odd fraction to be 0.125 ± 0.044 ( stat ) ± 0.007 ( syst ) . The time-dependent C P asymmetry parameters C + and S + are determined to be 0.06 ± 0.17 ( stat ) ± 0.03 ( syst ) and − 0.75 ± 0.25 ( stat ) ± 0.03 ( syst ) , respectively. The standard model predicts these parameters to be 0 and − sin 2 β , respectively, in the absence of penguin amplitude contributions.
PDF
