5,670 research outputs found
Recent results on beyond the standard model Higgs boson searches from CMS
Two extensions of the standard model, one that includes the seesaw mechanism
of type II, and the minimal supersymmetric extention to the standard model, are
studied using up to 1.6 fb^{-1} of data collected in proton-proton collisions
at sqrt{s}=7 TeV with the CMS detector at the LHC.Comment: Presented at the 2011 Hadron Collider Physics symposium (HCP-2011),
Paris, France, November 14-18 2011, 3 pages, 5 figure
Non-stationary heat conduction in one-dimensional chains with conserved momentum
The Letter addresses the relationship between hyperbolic equations of heat
conduction and microscopic models of dielectrics. Effects of the non-stationary
heat conduction are investigated in two one-dimensional models with conserved
momentum: Fermi-Pasta-Ulam (FPU) chain and chain of rotators (CR). These models
belong to different universality classes with respect to stationary heat
conduction. Direct numeric simulations reveal in both models a crossover from
oscillatory decay of short-wave perturbations of the temperature field to
smooth diffusive decay of the long-wave perturbations. Such behavior is
inconsistent with parabolic Fourier equation of the heat conduction. The
crossover wavelength decreases with increase of average temperature in both
models. For the FPU model the lowest order hyperbolic Cattaneo-Vernotte
equation for the non-stationary heat conduction is not applicable, since no
unique relaxation time can be determined.Comment: 4 pages, 5 figure
Suppression of thermal conductivity in graphene nanoribbons with rough edges
We analyze numerically the thermal conductivity of carbon nanoribbons with
ideal and rough edges. We demonstrate that edge disorder can lead to a
suppression of thermal conductivity by several orders of magnitude. This effect
is associated with the edge-induced Anderson localization and suppression of
the phonon transport, and it becomes more pronounced for longer nanoribbons and
low temperatures.Comment: 6 pages, 8 figure
Nonlinear Breathing-like Localized Modes in C60 Nanocrystals
We study the dynamics of nanocrystals composed of C60 fullerene molecules. We
demonstrate that such structures can support long-lived strongly localized
nonlinear oscillatory modes, which resemble discrete breathers in simple
lattices. We reveal that at room temperatures the lifetime of such nonlinear
localized modes may exceed tens of picoseconds; this suggests that C60
nanoclusters should demonstrate anomalously slow thermal relaxation when the
temperature gradient decays in accord to a power law, thus violating the
Cattaneo-Vernotte law of thermal conductivity.Comment: 6 pages, 6 figure
Prospects for Higgs and SM measurements at the HL-LHC
After a succesful startup of the LHC scientific program that has led to discovery of the Higgs boson it is time to make plans for the future. The high luminosity LHC (HLLHC) project is discussed, plans for possible Higgs and SM measurements are reviewed
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