3,461 research outputs found
NLO distributions for Higgs production at the LHC
We report on results for the NLO corrected differential distributions
and for the process , where
and are the transverse momentum and rapidity of the Higgs-boson
respectively and denotes the inclusive hadronic state. All QCD partonic
subprocesses have been included. The computation is carried out in the limit
that the top-quark mass . Our calculations reveal that the
dominant subprocess is given by but the reaction is not negligible. Also the -factor representing the
ratio between the next-to-leading order and leading order differential
distributions varies from 1.4 to 1.7 depending on the kinematic region and
choice of parton densities.Comment: 4 pages, Latex, 4 postscript figures, Contribution to Radcor0
The Number of Different Binary Functions Generated by NK-Kauffman Networks and the Emergence of Genetic Robustness
We determine the average number , of \textit{NK}-Kauffman
networks that give rise to the same binary function. We show that, for , there exists a connectivity critical value such that () for and
for . We find that is not a
constant, but scales very slowly with , as . The problem of genetic robustness emerges as a statistical property
of the ensemble of \textit{NK}-Kauffman networks and impose tight constraints
in the average number of epistatic interactions that the genotype-phenotype map
can have.Comment: 4 figures 18 page
Spin Networks and Recoupling in Loop Quantum Gravity
I discuss the role played by the spin-network basis and recoupling theory (in
its graphical tangle-theoretic formulation) and their use for performing
explicit calculations in loop quantum gravity. In particular, I show that
recoupling theory allows the derivation of explicit expressions for the
eingenvalues of the quantum volume operator. An important side result of these
computations is the determination of a scalar product with respect to which
area and volume operators are symmetric, and the spin network states are
orthonormal.Comment: 8 pages, LaTeX3e, To appear in the Proceedings of the 2nd Conference
on Constrained Dynamics and Quantum Gravity, Santa Margherita, Italy, 17-21
September 199
Infinitely many two-variable generalisations of the Alexander-Conway polynomial
We show that the Alexander-Conway polynomial Delta is obtainable via a
particular one-variable reduction of each two-variable Links-Gould invariant
LG^{m,1}, where m is a positive integer. Thus there exist infinitely many
two-variable generalisations of Delta. This result is not obvious since in the
reduction, the representation of the braid group generator used to define
LG^{m,1} does not satisfy a second-order characteristic identity unless m=1. To
demonstrate that the one-variable reduction of LG^{m,1} satisfies the defining
skein relation of Delta, we evaluate the kernel of a quantum trace.Comment: Published by Algebraic and Geometric Topology at
http://www.maths.warwick.ac.uk/agt/AGTVol5/agt-5-18.abs.htm
Distinguishing scalar from pseudoscalar Higgs production at the LHC
In this letter we examine the production channels for the scalar or
pseudoscalar Higgs plus two jets at the CERN Large Hadron Collider (LHC). We
identify possible signals for distinguishing between a scalar and a
pseudoscalar Higgs boson.Comment: 7 pages, REVTeX4, 4 eps figures. Figure 1 and 4 replaced. Typos
corrected, additional reference adde
On the Robustness of NK-Kauffman Networks Against Changes in their Connections and Boolean Functions
NK-Kauffman networks {\cal L}^N_K are a subset of the Boolean functions on N
Boolean variables to themselves, \Lambda_N = {\xi: \IZ_2^N \to \IZ_2^N}. To
each NK-Kauffman network it is possible to assign a unique Boolean function on
N variables through the function \Psi: {\cal L}^N_K \to \Lambda_N. The
probability {\cal P}_K that \Psi (f) = \Psi (f'), when f' is obtained through f
by a change of one of its K-Boolean functions (b_K: \IZ_2^K \to \IZ_2), and/or
connections; is calculated. The leading term of the asymptotic expansion of
{\cal P}_K, for N \gg 1, turns out to depend on: the probability to extract the
tautology and contradiction Boolean functions, and in the average value of the
distribution of probability of the Boolean functions; the other terms decay as
{\cal O} (1 / N). In order to accomplish this, a classification of the Boolean
functions in terms of what I have called their irreducible degree of
connectivity is established. The mathematical findings are discussed in the
biological context where, \Psi is used to model the genotype-phenotype map.Comment: 17 pages, 1 figure, Accepted in Journal of Mathematical Physic
Some New Solutions of Yang-Baxter Equation
We have found some new solutions of both rational and trigonometric types by
rewriting Yang-Baxter equation as a triple product equation in a vector space
of matrices.Comment: 8 page
Diphoton production in gluon fusion at small transverse momentum
We discuss the production of photon pairs in gluon-gluon scattering in the
context of the position-space resummation formalism at small transverse
momentum. We derive the remaining unknown coefficients that arise at
, as well as the remaining coefficient that occurs
in the Sudakov factor. We comment on the impact of these coefficients on the
normalization and shape of the resummed transverse momentum distribution of
photon pairs, which comprise an important background to Higgs boson production
at the LHC.Comment: 11 pages, 3 figures; minor changes, additional referenc
- …