3,310 research outputs found
Model-Independent Jets plus Missing Energy Searches
We present a proposal for performing model-independent jets plus missing
energy searches. Currently, these searches are optimized for mSUGRA and are
consequently not sensitive to all kinematically-accessible regions of parameter
space. We show that the reach of these searches can be broadened by setting
limits on the differential cross section as a function of the total visible
energy and the missing energy. These measurements only require knowledge of the
relevant Standard Model backgrounds and can be subsequently used to limit any
theoretical model of new physics. We apply this approach to an example where
gluinos are pair-produced and decay to the LSP through a single-step cascade,
and show how sensitivity to different gluino masses is altered by the presence
of the decay chain. The analysis is closely based upon the current searches
done at the Tevatron and our proposal requires only small modifications to the
existing techniques. We find that within the MSSM, the gluino can be as light
as 125 GeV. The same techniques are applicable to jets and missing energy
searches at the Large Hadron Collider.Comment: 22 pages, 6 figures, 3 tables, typos correcte
The B_s and D_s decay constants in 3 flavor lattice QCD
Capitalizing on recent advances in lattice QCD, we present a calculation of
the leptonic decay constants f_{B_s} and f_{D_s} that includes effects of one
strange sea quark and two light sea quarks. The discretization errors of
improved staggered fermion actions are small enough to simulate with 3
dynamical flavors on lattices with spacings around 0.1 fm using present
computer resources. By shedding the quenched approximation and the associated
lattice scale ambiguity, lattice QCD greatly increases its predictive power.
NRQCD is used to simulate heavy quarks with masses between 1.5 m_c and m_b. We
arrive at the following results: f_{B_s} = 260 \pm 7 \pm 26 \pm 8 \pm 5 MeV and
f_{D_s} = 290 \pm 20 \pm 29 \pm 29 \pm 6 MeV. The first quoted error is the
statistical uncertainty, and the rest estimate the sizes of higher order terms
neglected in this calculation. All of these uncertainties are systematically
improvable by including another order in the weak coupling expansion, the
nonrelativistic expansion, or the Symanzik improvement program.Comment: 4 page
Cellular localization, accumulation and trafficking of double-walled carbon nanotubes in human prostate cancer cells
Carbon nanotubes (CNTs) are at present being considered as potential nanovectors with the ability to deliver therapeutic cargoes into living cells. Previous studies established the ability of CNTs to enter cells and their therapeutic utility, but an appreciation of global intracellular trafficking associated with their cellular distribution has yet to be described. Despite the many aspects of the uptake mechanism of CNTs being studied, only a few studies have investigated internalization and fate of CNTs inside cells in detail. In the present study, intracellular localization and trafficking of RNA-wrapped, oxidized double-walled CNTs (oxDWNT–RNA) is presented. Fixed cells, previously exposed to oxDWNT–RNA, were subjected to immunocytochemical analysis using antibodies specific to proteins implicated in endocytosis; moreover cell compartment markers and pharmacological inhibitory conditions were also employed in this study. Our results revealed that an endocytic pathway is involved in the internalization of oxDWNT–RNA. The nanotubes were found in clathrin-coated vesicles, after which they appear to be sorted in early endosomes, followed by vesicular maturation, become located in lysosomes. Furthermore, we observed co-localization of oxDWNT–RNA with the small GTP-binding protein (Rab 11), involved in their recycling back to the plasma membrane via endosomes from the trans-golgi network
Electromagnetic and Weak Moments of the Tau-Lepton
The electromagnetic and weak dipole moments of the Tau-lepton have been
measured by experiments at e+e- colliders. Data samples of e+e- --> tau+tau-,
e+e- --> tau+tau- gamma and e+e- --> e+e-tau+tau- events collected at
centre-of-mass energies between 10 and 200 GeV are used. No deviation from the
Standard Model is found. Limits on the moments are summarised from the most
recent results.Comment: 6 pages (Latex), 5 figures (postscript
The deal.II Library, Version 8.3
deal.II version 8.3 was released August 1, 2015. This paper provides an overview of the new features of this release and serves as a citable reference for the deal.II software library version 8.3. deal.II is an object-oriented finite element library used around the world in the development of finite element solvers. It is available for free under the GNU Lesser General Public License (LGPL) from the deal.II homepage at http://www.dealii.org/
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