4,956 research outputs found
Test beam Characterizations of 3D Silicon Pixel detectors
3D silicon detectors are characterized by cylindrical electrodes
perpendicular to the surface and penetrating into the bulk material in contrast
to standard Si detectors with planar electrodes on its top and bottom. This
geometry renders them particularly interesting to be used in environments where
standard silicon detectors have limitations, such as for example the radiation
environment expected in an LHC upgrade. For the first time, several 3D sensors
were assembled as hybrid pixel detectors using the ATLAS-pixel front-end chip
and readout electronics. Devices with different electrode configurations have
been characterized in a 100 GeV pion beam at the CERN SPS. Here we report
results on unirradiated devices with three 3D electrodes per 50 x 400 um2 pixel
area. Full charge collection is obtained already with comparatively low bias
voltages around 10 V. Spatial resolution with binary readout is obtained as
expected from the cell dimensions. Efficiencies of 95.9% +- 0.1 % for tracks
parallel to the electrodes and of 99.9% +- 0.1 % at 15 degrees are measured.
The homogeneity of the efficiency over the pixel area and charge sharing are
characterized.Comment: 5 pages, 7 figure
Nuclear Antishadowing in Neutrino Deep Inelastic Scattering
The shadowing and antishadowing of nuclear structure functions in the
Gribov-Glauber picture is due respectively to the destructive and constructive
interference of amplitudes arising from the multiple-scattering of quarks in
the nucleus. The effective quark-nucleon scattering amplitude includes Pomeron
and Odderon contributions from multi-gluon exchange as well as Reggeon
quark-exchange contributions. We show that the coherence of these
multiscattering nuclear processes leads to shadowing and antishadowing of the
electromagnetic nuclear structure functions in agreement with measurements.
This picture leads to substantially different antishadowing for charged and
neutral current reactions, thus affecting the extraction of the weak-mixing
angle . We find that part of the anomalous NuTeV result for
could be due to the nonuniversality of nuclear antishadowing for
charged and neutral currents. Detailed measurements of the nuclear dependence
of individual quark structure functions are thus needed to establish the
distinctive phenomenology of shadowing and antishadowing and to make the NuTeV
results definitive.Comment: 38 pages, 15 figure
IBK UNIVERSITAS COKROAMINOTO PALOPO
Tujuan Iptek bagi Kewiausahaan (IbK) di Universitas Cokroaminoto Palopo secara Umum adalah penguatan kapasitas dan kapabilitas kewirausahaan mahasiswa dan alumni untuk menjadi job creator secara umum di Universitas Cokroaminoto Palopo (UNCP). Secara khusus target yang ingin dicapai dalam program IbK di Universitas Cokroaminoto Palopo adalah; 1) Adanya pengembangan dan pengingkatan pengetahuan keterampilan tenant dalam membuka binsis (berwirausaha), 2) Menciptakan 5 wirausaha baru di UNCP yang mandiri dan berdaya saing berbasis Potensi lokal dan Ipteks setiap tahunnya, 3) Terciptanya Wira Usaha baru yang berbasis Potensi lokal dan Ipteks setiap tahunnya, 4) Merancang dan menciptakan model pelatihan kewirausahaan yang disesuaikan dengan kebutuhan tenant, 5) Mempublikasikan laporan program setiap tahunnya melaui seminar dan junral yang bereputasi secara nasional maupun internasioanl. Luaran dari program IbK ini adalah; a) Luaran pada tahun pertama program IbK ini adalah publikasi pada jurnal nasional dan seminar nasional, b) Tahun pertama program IbK di Universitas Cokroaminoto Palopo wajib menghasilkan minimal 5 wirausaha baru yang berbasis Potensi lokal dan Ipteks setiapa tahunnya, c) pada tahun pertama, kedua dan ketiga menghasilkan peserta IbK yang menjadi wirausaha mandiri mengalami peningkatan di tahun ketiga sebesar 80%. d) Mengasilkan minimal 2 produk atau jasa Wira Usaha baru (WUB) yang berbasis Potensi lokal dan Ipteks, e) Ke 5 tenant setiap tahunnya mampu membangun jejaring wirausaha yang lebih luas dan mampu merekrut tenaga kerja. Metode pendekatan yang dilakukan yaitu pelatihan kewirausahaan, magang, pendampingan dan monitoring-evaluasi
Program IbK di UNCP dirancang setiap tahunnya membina minimal 20 tenant dan ditargetkan menghasilkan 5 wirausaha baru yang mandiri setiap tahunnya. Tenan tersebut berasal dari PKM kewirausahaan dan program wirausaha lainnya. Untuk mempertahankan eksistensi capaian setiap tahunnya dengan jumlah 20 tenant, maka pengelolah IbK di Universitas Cokroaminoto Palopo akan merekrut tenan baru dari sejumlah tenant yang telah berwirausha agar tenat tetap konsisten 20 setiap tahunny a. Pada prinsipnya program IbK di Universitas Cokroaminoto Palopo sehingga setiap mahasiswa dan alumni yang menjalankan wirausha atau mempunyai jiwa kewiraushaan dapat mendaftar sebagai anggota tenant tanpa dibatasi di sekertariat IbK di Universitas Cokroaminoto Palopo. Setiap mahsiswab yang mendaftar dan memenuhi criteria di program IbK Universitas Cokroaminoto Palopo akan difasilitasi untuk berpartisipasi dalam program yang telah dirancang secara professional oleh pengelolah IbK di Universitas Cokroaminoto Palopo.
Kata Kunci: Tenan, UNCP dan Wirausaha Mandiri
Combined QCD and electroweak analysis of HERA data
A simultaneous fit of parton distribution functions (PDFs) and electroweak
parameters to HERA data on deep inelastic scattering is presented. The input
data are the neutral current and charged current inclusive cross sections which
were previously used in the QCD analysis leading to the HERAPDF2.0 PDFs. In
addition, the polarisation of the electron beam was taken into account for the
ZEUS data recorded between 2004 and 2007. Results on the vector and
axial-vector couplings of the Z boson to u- and d-type quarks, on the value of
the electroweak mixing angle and the mass of the W boson are presented. The
values obtained for the electroweak parameters are in agreement with Standard
Model predictions.Comment: 32 pages, 10 figures, accepted by Phys. Rev. D. Small corrections
from proofing process and small change to Fig. 12 and Table
Limits on the effective quark radius from inclusive scattering at HERA
The high-precision HERA data allows searches up to TeV scales for Beyond the
Standard Model contributions to electron-quark scattering. Combined
measurements of the inclusive deep inelastic cross sections in neutral and
charged current scattering corresponding to a luminosity of around 1
fb have been used in this analysis. A new approach to the beyond the
Standard Model analysis of the inclusive data is presented; simultaneous
fits of parton distribution functions together with contributions of "new
physics" processes were performed. Results are presented considering a finite
radius of quarks within the quark form-factor model. The resulting 95% C.L.
upper limit on the effective quark radius is cm.Comment: 10 pages, 4 figures, accepted by Phys. Lett.
Measurement of the cross-section ratio sigma_{psi(2S)}/sigma_{J/psi(1S)} in deep inelastic exclusive ep scattering at HERA
The exclusive deep inelastic electroproduction of and
at an centre-of-mass energy of 317 GeV has been studied with the ZEUS
detector at HERA in the kinematic range GeV,
GeV and GeV, where is the photon virtuality, is the
photon-proton centre-of-mass energy and is the squared four-momentum
transfer at the proton vertex. The data for GeV were taken in
the HERA I running period and correspond to an integrated luminosity of 114
pb. The data for GeV are from both HERA I and HERA II
periods and correspond to an integrated luminosity of 468 pb. The decay
modes analysed were and for the
and for the . The cross-section ratio
has been measured as a function of
and . The results are compared to predictions of QCD-inspired
models of exclusive vector-meson production.Comment: 24 pages, 8 figure
An NLO QCD analysis of inclusive cross-section and jet-production data from the ZEUS experiment
The ZEUS inclusive differential cross-section data from HERA, for charged and
neutral current processes taken with e+ and e- beams, together with
differential cross-section data on inclusive jet production in e+ p scattering
and dijet production in \gamma p scattering, have been used in a new NLO QCD
analysis to extract the parton distribution functions of the proton. The input
of jet data constrains the gluon and allows an accurate extraction of
\alpha_s(M_Z) at NLO;
\alpha_s(M_Z) = 0.1183 \pm 0.0028(exp.) \pm 0.0008(model)
An additional uncertainty from the choice of scales is estimated as \pm
0.005. This is the first extraction of \alpha_s(M_Z) from HERA data alone.Comment: 37 pages, 14 figures, to be submitted to EPJC. PDFs available at
http://durpdg.dur.ac.uk/hepdata in LHAPDFv
Measurement of neutral current e+/-p cross sections at high Bjorken x with the ZEUS detector
The neutral current e+/-p cross section has been measured up to values of
Bjorken x of approximately 1 with the ZEUS detector at HERA using an integrated
luminosity of 187 inv. pb of e-p and 142 inv. pb of e+p collisions at sqrt(s) =
318GeV. Differential cross sections in x and Q2, the exchanged boson
virtuality, are presented for Q2 geq 725GeV2. An improved reconstruction method
and greatly increased amount of data allows a finer binning in the high-x
region of the neutral current cross section and leads to a measurement with
much improved precision compared to a similar earlier analysis. The
measurements are compared to Standard Model expectations based on a variety of
recent parton distribution functions.Comment: 39 pages, 9 figure
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