384 research outputs found
A Unified Model for inelastic e-N and nu-N cross sections at all Q2
We present results using a new scaling variable, xi_w in modeling electron-
and neutrino-nucleon scattering cross sections with effective leading order
PDFs.Our model uses all inelastic charged lepton F_2 data
(SLAC/BCDMS/NMC/HERA), and photoproduction data on hydrogen and deuterium. We
find that our model describes all inelastic scattering charged lepton data, the
average of JLAB resonance data, and neutrino data at all Q2. This model is
currently used by current neutrino oscillation experiments in the few GeV
region.Comment: 4 pages, 4 figures, presented at 13th International Workshop on Deep
Inelastic Scattering (DIS 05), Madison, Wisconsin, 27 Apr - 1 May 200
NuTeV Structure Function Measurement
The NuTeV experiment obtained high statistics samples of neutrino and
anti-neutrino charged current events during the 1996-1997 Fermilab fixed target
run. The experiment combines sign-selected neutrino and anti-neutrino beams and
the upgraded CCFR iron-scintillator neutrino detector. A precision continuous
calibration beam was used to determine the muon and hadron energy scales to a
precision of 0.7% and 0.43% respectively. The structure functions F_2(x,Q^2)
and xF_3(x,Q^2) obtained by fitting the y-dependence of the sum and the
difference of the neutrino and anti-neutrino differential cross sections are
presented.Comment: Proceedings of the XIII international workshop on Deep Inelastic
Scattering DIS 2005, 4 pages, 4 figure
Summary of the Structure Functions and Low-x working group
We report a summary of the structure function working group which covers a
wide range of the recent results from HERA, Tevatron, RHIC, and JLab
experiments, and many theoretical issues from low x to high x.Comment: 20 pages, presented at 13th International Workshop on Deep Inelastic
Scattering (DIS 05), Madison, Wisconsin, 27 Apr - 1 May 200
New Production Mechanism for Heavy Neutrinos at the LHC
We study a new production mechanism for heavy neutrinos at the LHC, which
dominates over the usually considered -channel -exchange diagram for
heavy-neutrino masses larger than 100 - 200 GeV. The new mechanism is
infrared-enhanced by -channel -fusion processes. This has important
implications for experimental tests of the seesaw mechanism of neutrino masses,
and in particular, for the ongoing heavy neutrino searches at the LHC. We find
that the direct collider limits on the light-to-heavy neutrino mixing can be
significantly improved, when this new production channel is properly taken into
account. The scope of this new mechanism can equally well be extended to other
exotic searches at the LHC.Comment: 5 pages, 4 figures; version accepted by Phys. Rev. Let
Pixel data real time processing as a next step for HL-LHC upgrades and beyond
The experiments at LHC are implementing novel and challenging detector
upgrades for the High Luminosity LHC, among which the tracking systems. This
paper reports on performance studies, illustrated by an electron trigger, using
a simplified pixel tracker. To achieve a real-time trigger (e.g. processing
HL-LHC collision events at 40 MHz), simple algorithms are developed for
reconstructing pixel-based tracks and track isolation, utilizing look-up tables
based on pixel detector information. Significant gains in electron trigger
performance are seen when pixel detector information is included. In
particular, a rate reduction up to a factor of 20 is obtained with a signal
selection efficiency of more than 95\% over the whole coverage of this
detector. Furthermore, it reconstructs p-p collision points in the beam axis
(z) direction, with a high precision of 20 m resolution in the very
central region (), and, up to 380 m in the forward region
(2.7 3.0). This study as well as the results can easily be adapted
to the muon case and to the different tracking systems at LHC and other
machines beyond the HL-LHC. The feasibility of such a real-time processing of
the pixel information is mainly constrained by the Level-1 trigger latency of
the experiment. How this might be overcome by the Front-End ASIC design, new
processors and embedded Artificial Intelligence algorithms is briefly tackled
as well.Comment: To be submitted to JHE
Prospects for charged Higgs Boson searches at the Large Hadron Collider with early ATLAS data
See full text for abstractEThOS - Electronic Theses Online ServiceGBUnited Kingdo
Improved low Q2 model for neutrino and electron nucleon cross sections in few GeV region
We present an improved model on neutrino- and electron-nucleon scattering
cross sections using effective leading order PDFs with a new scaling variable
xi_w. Non-perturbative QCD effects at low Q^2 are separately treated for u and
d valence quarks, and sea quarks. The improved model uses all inelastic charged
lepton F_2 data (SLAC/BCDMS/NMC/HERA), and photoproduction data on proton and
deuterium. In this way, we obtain an improved model which describes all
inelastic scattering charged lepton data, JLAB resonance data, and neutrino
data. This improved model is expected to be better for neutrino oscillation
experiments at few GeV region.Comment: Prepared for International Workshop on Neutrino-Nucleus Interactions
in the Few GeV Regions (NuInt04), Gran Sasso Lab., Italy, March, 2004, 6
pages, 10 figure
Floristic study of Cheondeungsan Mountain in Korea
AbstractThe distribution of native plants of Cheondeungsan Mountain (807 m, N 37°05'00ââ37°05'30â, E 128°00'0ââ128°02'0â) in Chungcheongbuk-do was determined and the major flora were identified. During field investigations carried out from May 2011 to October 2011, 87 families, 254 genera, and 369 taxonomic groups (327 species, 4 subspecies, 33 varieties, and 5 forms) were confirmed, and the distribution of 219 taxonomic groups was discovered for the first time. The distribution of four endemic plants of Korea, including Ajuga spectabilis Nakai and Salvia chanryoenica Nakai, and that of Penthorum chinense Pursh, a Grade V specific plant species, was found. There were 20 taxa of naturalized plants at Cheondeungsan; the growth and development of plants that are harmful to the ecosystem, such as Ambrosia artemisiifolia L., Ambrosia trifida L., Eupatorium rugosum Houtt., and Aster pilosus Willd., was observed around the forest paths and lowlands
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