71 research outputs found
Phenomenology of a SU(2) triplet Higgs.
We study the Renormalization Group (RG) evolution of the couplings in
a model with a real SU(2) triplet in the Higgs sector. Insisting that the
model remain valid up to 1 TeV we show that it is possible for there to
be no light Higgs bosons without any otherwise dramatic deviation from
the physics of the Standard Model
Solution of the BFKL equation at next-to-leading order.
We solve the Balitsky–Fadin–Kuraev–Lipatov (BFKL) equation in the
next–to–leading logarithmic approximation for forward scattering with
all conformal spins using an iterative method
Large-Q_T W-boson production at the Tevatron
The production of W bosons at large transverse momentum at the Tevatron is
dominated by soft-gluon corrections. In this talk we present a calculation of
these corrections at next-to-next-to-leading order. The corrections enhance the
transverse momentum distribution of the W while reducing the scale dependence.Comment: 4 pages, 2 figures, presented at DPF04, Riverside, California, August
26-31, 200
BFKL Effects in Azimuthal Angle Correlations of Forward Jets
The azimuthal angle correlation of Mueller-Navelet jets at hadron colliders
is studied in the NLO BFKL formalism. We highlight the need of collinear
improvements in the kernel to obtain good convergence properties and we obtain
better fits for the Tevatron data than at LO accuracy. We also estimate these
correlations for larger rapidity differences available at the LHC.Comment: Presented at DIS 2007: 15th International Workshop on Deep-Inelastic
Scattering, Munich, Germany, 16-20 Apr 2007, 4 pages, 3 figures, LATE
Open Spin Chains and Complexity in the High Energy Limit
In the high energy limit of scattering amplitudes in Quantum Chromodynamics
and supersymmetric theories the dominant Feynman diagrams are characterized by
a hidden integrability. A well-known example is that of Odderon exchange, which
can be described as a bound state of three reggeized gluons and corresponds to
a closed spin chain with periodic boundary conditions. In the
supersymmetric Yang-Mills theory a similar spin chain arises in the multi-Regge
asymptotics of the eight-point amplitude in the planar limit. We investigate
the associated open spin chain in transverse momentum and rapidity variables
solving the corresponding effective Feynman diagrams. We introduce the concept
of complexity in the high energy effective field theory and study its emerging
scaling laws.Comment: 24 pages, 13 figures; references adde
Angular decorrelations in Mueller-Navelet jets and DIS
We discuss the azimuthal angle decorrelation of Mueller-Navelet jets at
hadron colliders and forward jets in Deep Inelastic Scattering within the BFKL
framework with a NLO kernel. We stress the need of collinear improvements to
obtain good perturbative convergence. We provide estimates of these
decorrelations for large rapidity differences at the Tevatron, LHC and HERA.Comment: Talk given at 12th International Conference on Elastic and
Diffractive Scattering: Forward Physics and QCD, Hamburg, DESY, Germany,
21-25 May 200
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