Nucl.Instrum.Meth.A572:676-681,2007 Usage of electrodes made of glass with low bulk resistivity seems to be a
promising way to adapt the Resistive Plate Chambers (RPC) to the high-rate
environment of ...the upcoming CBM experiment. A pilot four-gap RPC sample with
electrodes made of phosphate glass, which has bulk resistivity in the order of
10^10 Ohm cm, has been studied with MIP beam for TOF applications. The tests
have yielded satisfactory results: the efficiency remains above 95% and the
time resolution stays within 120 ps up to the particle rate of 18 kHz/cm2. The
increase in rate from 2.25 to 18 kHz/cm2 leads to an increase of estimated
"tails" fraction in the time spectrum from 1.5% to 4%.
Nucl.Instrum.Meth. A531 (2004) 467-480 A Shashlyk calorimeter prototype for the KOPIO experiment has been
constructed and experimentally tested. The energy resolution of about
4%/sqrt(E(GeV)) for ...0.5-2.0 GeV/c positrons was obtained. Based on this results
as well as on the results of special measurements, a Monte-Carlo model of the
Shashlyk module response was developed. This model, including the effects of
shower evolution, light collection in scintillator plates, light attenuation in
fibers, quantum efficiency of the photodetector, thresholds and noises in the
readout system is consistent with experimental results. Possible improvment of
the Shashlyk energy resolution up to 3%/sqrt(E(GeV)), the level required by
KOPIO experiment, are discussed.
We report on the measurement of two-pion correlation functions from pp collisions at sqrt(s)=900 GeV performed by the ALICE experiment at the Large Hadron Collider. Our analysis shows an increase of ...the HBT radius with increasing event multiplicity, in line with other measurements done in particle- and nuclear collisions. Conversely, the strong decrease of the radius with increasing transverse momentum, as observed at RHIC and at Tevatron, is not manifest in our data.
A Shashlyk calorimeter prototype for the KOPIO experiment has been constructed and experimentally tested. The energy resolution of about 4%/sqrt(E(GeV)) for 0.5-2.0 GeV/c positrons was obtained. ...Based on this results as well as on the results of special measurements, a Monte-Carlo model of the Shashlyk module response was developed. This model, including the effects of shower evolution, light collection in scintillator plates, light attenuation in fibers, quantum efficiency of the photodetector, thresholds and noises in the readout system is consistent with experimental results. Possible improvment of the Shashlyk energy resolution up to 3%/sqrt(E(GeV)), the level required by KOPIO experiment, are discussed.
Usage of electrodes made of glass with low bulk resistivity seems to be a promising way to adapt the Resistive Plate Chambers (RPC) to the high-rate environment of the upcoming CBM experiment. A ...pilot four-gap RPC sample with electrodes made of phosphate glass, which has bulk resistivity in the order of 10^10 Ohm cm, has been studied with MIP beam for TOF applications. The tests have yielded satisfactory results: the efficiency remains above 95% and the time resolution stays within 120 ps up to the particle rate of 18 kHz/cm2. The increase in rate from 2.25 to 18 kHz/cm2 leads to an increase of estimated "tails" fraction in the time spectrum from 1.5% to 4%.
We propose a new experiment at the AGS to search for the T-violating
polarization of the muon normal to the decay plane of the K+ to mu+ pi0 nu
decay. Motivated by the need for a stronger CP ...violation source to account for
the baryon asymmetry of the Universe, the experiment aims to search for
T-violation beyond the Standard Model. The experiment will be performed with
in-flight decays from an intense 2 GeV/c separated K+ beam at the AGS. We
expect to analyze 10**9 events to obtain the sensitivity of delta Pt = +-
0.00013 at 1 sigma, corresponding to the sensitivity of +-0.0007 to Im(xi), an
improvement by 40 over the present limit.
We propose a new experiment at the AGS to search for the T-violating polarization of the muon normal to the decay plane of the K+ to mu+ pi0 nu decay. Motivated by the need for a stronger CP ...violation source to account for the baryon asymmetry of the Universe, the experiment aims to search for T-violation beyond the Standard Model. The experiment will be performed with in-flight decays from an intense 2 GeV/c separated K+ beam at the AGS. We expect to analyze 10**9 events to obtain the sensitivity of delta Pt = +- 0.00013 at 1 sigma, corresponding to the sensitivity of +-0.0007 to Im(xi), an improvement by 40 over the present limit.
The production of
π
±
,
K
±
,
K
S
0
,
K
∗
(
892
)
0
,
p
,
ϕ
(
1020
)
,
Λ
,
Ξ
-
,
Ω
-
, and their antiparticles was measured in inelastic proton–proton (pp) collisions at a center-of-mass energy of
s
...= 13 TeV at midrapidity (
|
y
|
<
0.5
) as a function of transverse momentum (
p
T
) using the ALICE detector at the CERN LHC. Furthermore, the single-particle
p
T
distributions of
K
S
0
,
Λ
, and
Λ
¯
in inelastic pp collisions at
s
=
7
TeV are reported here for the first time. The
p
T
distributions are studied at midrapidity within the transverse momentum range
0
≤
p
T
≤
20
GeV/
c
, depending on the particle species. The
p
T
spectra, integrated yields, and particle yield ratios are discussed as a function of collision energy and compared with measurements at lower
s
and with results from various general-purpose QCD-inspired Monte Carlo models. A hardening of the spectra at high
p
T
with increasing collision energy is observed, which is similar for all particle species under study. The transverse mass and
x
T
≡
2
p
T
/
s
scaling properties of hadron production are also studied. As the collision energy increases from
s
= 7–13 TeV, the yields of non- and single-strange hadrons normalized to the pion yields remain approximately constant as a function of
s
, while ratios for multi-strange hadrons indicate enhancements. The
p
T
-differential cross sections of
π
±
,
K
±
and
p
(
p
¯
) are compared with next-to-leading order perturbative QCD calculations, which are found to overestimate the cross sections for
π
±
and
p
(
p
¯
) at high
p
T
.
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