4,875 research outputs found
Quark-lepton symmetric model at the LHC
We investigate the quark-lepton symmetric model of Foot and Lew in the
context of the Large Hadron Collider (LHC). In this `bottom-up' extension to
the Standard Model, quark-lepton symmetry is achieved by introducing a gauged
`leptonic colour' symmetry which is spontaneously broken above the electroweak
scale. If this breaking occurs at the TeV scale, then we expect new physics to
be discovered at the LHC. We examine three areas of interest: the Z heavy
neutral gauge boson, charge exotic leptons, and a colour triplet
scalar diquark. We find that the LHC has already explored and/or will explore
new parameter space for these particles over the course of its lifetime.Comment: 24 pages, 6 figure
Phenomenology of a very light scalar (100 MeV 10 GeV) mixing with the SM Higgs
In this paper we investigate the phenomenology of a very light scalar, ,
with mass 100 MeV 10 GeV, mixing with the SM Higgs. As a benchmark
model we take the real singlet scalar extension of the SM. We point out
apparently unresolved uncertainties in the branching ratios and lifetime of
in a crucial region of parameter space for LHC phenomenology. Bounds from LEP,
meson decays and fixed target experiments are reviewed. We also examine
prospects at the LHC. For the dominant production mechanism
is via meson decay; our main result is the calculation of the differential
spectrum of scalars originating from B mesons and the subsequent
prediction of up to thousands of moderate (triggerable) displaced dimuons
possibly hiding in the existing dataset at ATLAS/CMS or at LHCb. We also
demonstrate that the subdominant production channel has the best
sensitivity for and that future bounds in this region could
conceivably compete with those of LEP.Comment: 13 pages, 9 figure
Personal worldviews, dialogue and tolerance : students’ views on religious education in England
Multi-Boundary Entanglement in Chern-Simons Theory and Link Invariants
We consider Chern-Simons theory for gauge group at level on
3-manifolds with boundary consisting of topologically linked tori.
The Euclidean path integral on defines a quantum state on the boundary,
in the -fold tensor product of the torus Hilbert space. We focus on the case
where is the link-complement of some -component link inside the
three-sphere . The entanglement entropies of the resulting states define
framing-independent link invariants which are sensitive to the topology of the
chosen link. For the Abelian theory at level () we give a
general formula for the entanglement entropy associated to an arbitrary
partition of a generic -component link into sub-links. The formula
involves the number of solutions to certain Diophantine equations with
coefficients related to the Gauss linking numbers (mod ) between the two
sublinks. This formula connects simple concepts in quantum information theory,
knot theory, and number theory, and shows that entanglement entropy between
sublinks vanishes if and only if they have zero Gauss linking (mod ). For , we study various two and three component links. We show that the
2-component Hopf link is maximally entangled, and hence analogous to a Bell
pair, and that the Whitehead link, which has zero Gauss linking, nevertheless
has entanglement entropy. Finally, we show that the Borromean rings have a
"W-like" entanglement structure (i.e., tracing out one torus does not lead to a
separable state), and give examples of other 3-component links which have
"GHZ-like" entanglement (i.e., tracing out one torus does lead to a separable
state).Comment: 37 pages, 19 figure
Noncooperatively Optimized Tolerance: Decentralized Strategic Optimization in Complex Systems
We introduce noncooperatively optimized tolerance (NOT), a generalization of
highly optimized tolerance (HOT) that involves strategic (game theoretic)
interactions between parties in a complex system. We illustrate our model in
the forest fire (percolation) framework. As the number of players increases,
our model retains features of HOT, such as robustness, high yield combined with
high density, and self-dissimilar landscapes, but also develops features of
self-organized criticality (SOC) when the number of players is large enough.
For example, the forest landscape becomes increasingly homogeneous and
protection from adverse events (lightning strikes) becomes less closely
correlated with the spatial distribution of these events. While HOT is a
special case of our model, the resemblance to SOC is only partial; for example,
the distribution of cascades, while becoming increasingly heavy-tailed as the
number of players increases, also deviates more significantly from a power law
in this regime. Surprisingly, the system retains considerable robustness even
as it becomes fractured, due in part to emergent cooperation between
neighboring players. At the same time, increasing homogeneity promotes
resilience against changes in the lightning distribution, giving rise to
intermediate regimes where the system is robust to a particular distribution of
adverse events, yet not very fragile to changes
The interpretive approach to religious education : challenging Thompson's interpretation
In a recent book chapter, Matthew Thompson makes some criticisms of my work, including the interpretive approach to religious education and the research and activity of Warwick Religions and Education Research Unit. Against the background of a discussion of religious education in the public sphere, my response challenges Thompson’s account, commenting on his own position in relation to dialogical approaches to religious education. The article rehearses my long held view that the ideal form of religious education in fully state funded schools of a liberal democracy should be ‘secular’ but not ‘secularist’; there should be no implication of an axiomatic secular humanist interpretation of religions
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