23,989 research outputs found
Color-octet scalar effects on Higgs boson production in gluon fusion
We compute the next-to-next-to-leading order QCD corrections to the
gluon-fusion production of a Higgs boson in models with massive color-octet
scalars in the representation using an effective-theory
approach. We derive a compact analytic expression for the relevant Wilson
coefficient, and explain an interesting technical aspect of the calculation
that requires inclusion of the quartic-scalar interactions at
next-to-next-to-leading order. We perform a renormalization-group analysis of
the scalar couplings to derive the allowed regions of parameter space, and
present phenomenological results for both the Tevatron and the LHC. The
modifications of the Higgs production cross section are large at both
colliders, and can increase the Standard Model rate by more than a factor of
two in allowed regions of parameter space. We estimate that stringent
constraints on the color-octet scalar parameters can be obtained using the
Tevatron exclusion limit on Higgs production.Comment: 18 pages, 6 figures, 3 table
Subluminal OPERA Neutrinos
The OPERA collaboration has announced to have observed superluminal neutrinos
with a mean energy 17.5 GeV, but afterward the superluminal interpretation of
the OPERA results has been refuted theoretically by Cherenkov-like radiation
and pion decay. In a recent work, we have proposed a kinematical resolution to
this problem. A key idea in our resolution is that the OPERA neutrinos are not
superluminal but subluminal since they travel faster than the observed speed of
light in vacuum on the earth while they do slower than the true speed of light
in vacuum determining the causal structure of events. In this article, we dwell
upon our ideas and present some concrete models, which realize our ideas, based
on spin 0, 1 and 2 bosonic fields. We also discuss that the principle of
invariant speed of light in special relativity can be replaced with the
principle of a universal limiting speed.Comment: 17 page
Velocity of Light in Dark Matter with Charge
We propose an interesting mechanism to reconcile the recent experiments of
the Michelson-Morley type and slowdown of the velocity of light in dark matter
with a fractional electric charge when the index of refraction of dark matter
depends on the frequency of a photon. After deriving the formula for the
velocity of light in a medium with the index of refraction in a
relativistic regime, it is shown that the local anisotropy of the light speed
is proportional to the second order in . This result implies
that the experiments of the Michelson-Morley type do not give rise to a
stringent constraint on the slowdown of the velocity of light in dark matter
with electric charge.Comment: 10 page
Boundary conditions at spatial infinity for fields in Casimir calculations
The importance of imposing proper boundary conditions for fields at spatial
infinity in the Casimir calculations is elucidated.Comment: 8 pages, 1 figure, submitted to the Proceedings of The Seventh
Workshop QFEXT'05 (Barcelona, September 5-9, 2005
Electroweak gauge boson production at hadron colliders through O(alpha_s^2)
We describe a calculation of the O(alpha_s^2) QCD corrections to the fully
differential cross section for W and Z boson production in hadronic collisions.
The result is fully realistic in that it includes spin correlations, finite
width effects, gamma-Z interference and allows for the application of arbitrary
cuts on the leptonic decay products of the W and Z. We have implemented this
calculation into a numerical program. We demonstrate the use of this code by
presenting phenomenological results for several future LHC analyses and recent
Tevatron measurements, including the W cross section in the forward rapidity
region and the central over forward cross section ratio.Comment: 11 pages, 4 figure
APMEC: An Automated Provisioning Framework for Multi-access Edge Computing
Novel use cases and verticals such as connected cars and human-robot
cooperation in the areas of 5G and Tactile Internet can significantly benefit
from the flexibility and reduced latency provided by Network Function
Virtualization (NFV) and Multi-Access Edge Computing (MEC). Existing frameworks
managing and orchestrating MEC and NFV are either tightly coupled or completely
separated. The former design is inflexible and increases the complexity of one
framework. Whereas, the latter leads to inefficient use of computation
resources because information are not shared. We introduce APMEC, a dedicated
framework for MEC while enabling the collaboration with the management and
orchestration (MANO) frameworks for NFV. The new design allows to reuse
allocated network services, thus maximizing resource utilization. Measurement
results have shown that APMEC can allocate up to 60% more number of network
services. Being developed on top of OpenStack, APMEC is an open source project,
available for collaboration and facilitating further research activities
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