560,989 research outputs found
SUSY-Yukawa Sum Rule at the LHC
We propose the "supersymmetric (SUSY) Yukawa sum rule", a relationship
between physical masses and mixing angles of the third-generation quarks and
squarks. The sum rule follows directly from a relation between quark and squark
couplings to the Higgs, enforced by SUSY. It is exactly this relation that
ensures the cancellation of the one-loop quadratic divergence in the Higgs mass
from the top sector. Testing the sum rule experimentally would thus provide a
powerful consistency check on SUSY as the solution to the gauge hierarchy
problem. While such a test will most likely have to await a future
next-generation lepton collider, the LHC experiments may be able to make
significant progress towards this goal. If some of the terms entering the sum
rule are measured at the LHC, the sum rule can be used (within SUSY framework)
to put interesting constraints on the other terms, such as the mixing angles
among third-generation squarks. We outline how the required mass measurements
could be performed, and estimate the accuracy that can be achieved at the LHC.Comment: 6 pages, 3 figures (final version accepted for publication in PRD;
extended discussion of Upsilon and Upsilon_prime
Automatic Generation of CHR Constraint Solvers
In this paper, we present a framework for automatic generation of CHR solvers
given the logical specification of the constraints. This approach takes
advantage of the power of tabled resolution for constraint logic programming,
in order to check the validity of the rules. Compared to previous works where
different methods for automatic generation of constraint solvers have been
proposed, our approach enables the generation of more expressive rules (even
recursive and splitting rules) that can be used directly as CHR solvers.Comment: to be published in Theory and Practice of Logic Programming, 16
pages, 2 figure
Composite Higgs Sketch
The coupling of a composite Higgs to the standard model fields can deviate
substantially from the standard model values. In this case perturbative
unitarity might break down before the scale of compositeness is reached, which
would suggest that additional composites should lie well below this scale. In
this paper we account for the presence of an additional spin 1 custodial
triplet of rhos. We examine the implications of requiring perturbative
unitarity up to the compositeness scale and find that one has to be close to
saturating certain unitarity sum rules involving the Higgs and the rho
couplings. Given these restrictions on the parameter space we investigate the
main phenomenological consequences of the spin 1 triplet. We find that they can
substantially enhance the Higgs di-photon rate at the LHC even with a reduced
Higgs coupling to gauge bosons. The main existing LHC bounds arise from
di-boson searches, especially in the experimentally clean channel where the
charged rhos decay to a W-boson and a Z, which then decay leptonically. We find
that a large range of interesting parameter space with 700 GeV < m(rho) < 2 TeV
is currently experimentally viable.Comment: 37 pages, 12 figures; v4: sum rule corrected, conclusions unchange
Improvising Linguistic Style: Social and Affective Bases for Agent Personality
This paper introduces Linguistic Style Improvisation, a theory and set of
algorithms for improvisation of spoken utterances by artificial agents, with
applications to interactive story and dialogue systems. We argue that
linguistic style is a key aspect of character, and show how speech act
representations common in AI can provide abstract representations from which
computer characters can improvise. We show that the mechanisms proposed
introduce the possibility of socially oriented agents, meet the requirements
that lifelike characters be believable, and satisfy particular criteria for
improvisation proposed by Hayes-Roth.Comment: 10 pages, uses aaai.sty, lingmacros.sty, psfig.st
Classes of Terminating Logic Programs
Termination of logic programs depends critically on the selection rule, i.e.
the rule that determines which atom is selected in each resolution step. In
this article, we classify programs (and queries) according to the selection
rules for which they terminate. This is a survey and unified view on different
approaches in the literature. For each class, we present a sufficient, for most
classes even necessary, criterion for determining that a program is in that
class. We study six classes: a program strongly terminates if it terminates for
all selection rules; a program input terminates if it terminates for selection
rules which only select atoms that are sufficiently instantiated in their input
positions, so that these arguments do not get instantiated any further by the
unification; a program local delay terminates if it terminates for local
selection rules which only select atoms that are bounded w.r.t. an appropriate
level mapping; a program left-terminates if it terminates for the usual
left-to-right selection rule; a program exists-terminates if there exists a
selection rule for which it terminates; finally, a program has bounded
nondeterminism if it only has finitely many refutations. We propose a
semantics-preserving transformation from programs with bounded nondeterminism
into strongly terminating programs. Moreover, by unifying different formalisms
and making appropriate assumptions, we are able to establish a formal hierarchy
between the different classes.Comment: 50 pages. The following mistake was corrected: In figure 5, the first
clause for insert was insert([],X,[X]
Notes on Connes' Construction of the Standard Model
The mathematical apparatus of non commutative geometry and operator algebras
which Connes has brought to bear to construct a rational scheme for the
internal symmetries of the standard model is presented from the physicist's
point of view. Gauge symmetry, anomaly freedom, conservation of electric
charge, parity violation and charge conjugation all play a vital role. When put
together with a relatively simple set of algebraic algorithms they deliver many
of the features of the standard model which otherwise seem rather ad hoc.Comment: 25 pages, Latex, no figure
Answer-Type Modification without Tears: Prompt-Passing Style Translation for Typed Delimited-Control Operators
The salient feature of delimited-control operators is their ability to modify
answer types during computation. The feature, answer-type modification (ATM for
short), allows one to express various interesting programs such as typed printf
compactly and nicely, while it makes it difficult to embed these operators in
standard functional languages.
In this paper, we present a typed translation of delimited-control operators
shift and reset with ATM into a familiar language with multi-prompt shift and
reset without ATM, which lets us use ATM in standard languages without
modifying the type system. Our translation generalizes Kiselyov's direct-style
implementation of typed printf, which uses two prompts to emulate the
modification of answer types, and passes them during computation. We prove that
our translation preserves typing. As the naive prompt-passing style translation
generates and passes many prompts even for pure terms, we show an optimized
translation that generate prompts only when needed, which is also
type-preserving. Finally, we give an implementation in the tagless-final style
which respects typing by construction.Comment: In Proceedings WoC 2015, arXiv:1606.0583
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