2,160 research outputs found
Generalized Bootstrap Equations and possible implications for the NLO Odderon
We formulate and discuss generalized bootstrap equations in nonabelian gauge
theories. They are shown to hold in the leading logarithmic approximation.
Since their validity is related to the self-consistency of the Steinmann
relations for inelastic production amplitudes they can be expected to be valid
also in NLO. Specializing to the N=4 SYM, we show that the validity in NLO of
these generalized bootstrap equations allows to find the NLO Odderon solution
with intercept exactly at one, a result which is valid also for the planar
limit of QCD.Comment: 20 pages, latex, 11 figures, Comments added, To appear on EPJ
The NLO Jet Vertex for Mueller-Navelet and Forward Jets: the Quark Part
We calculate the next-to-leading corrections to the jet vertex which is
relevant for the Mueller-Navelet-jets production in p-pbar collisions and for
the forward jet cross section in e-p collisions. In this first part we present
the results of the vertex for an incoming quark. Particular emphasis is given
to the separation of the collinear divergent part and the central region of the
produced gluon.Comment: 28 pages, 8 eps figure
Multiple interactions and AGK rules in pQCD
We review some aspects of multiple interactions in High Energy QCD; we
discuss in particular AGK rules and present some results concerning multiple
interactions in the context of jet production.Comment: Talk given by MS at 12th International Conference on Elastic and
Diffractive Scattering: Forward Physics and QCD, Hamburg, DESY, Germany,
21-25 May 2007. 7pp. Minor change
The NLO Jet Vertex for Mueller-Navelet and Forward Jets: the Gluon Part
In this paper we complete our calculation of the NLO jet vertex which is part
of the cross section formulae for the production of Mueller Navelet jets at
hadron hadron colliders and of forward jets in deep inelastic electron proton
scattering.Comment: 16 pages, latex, epj style, 6 eps figure
On the Triple Pomeron Vertex in Perturbative QCD
We estimate the size of the triple Pomeron vertex in perturbative QCD and
compare with the phenomenological value extracted from Regge fits to
experimental data. For simplicity, the results of the QCD analysis are taken in
the large-N_c limit. We find that the perturbative triple Pomeron coupling is
of the same order of magnitude as the observed one. We also estimate the size
of the Pomeron self energy and its contribution to the renormalization of the
Pomeron intercept. The effect is very small, in agreement with previous
nonperturbative estimates.Comment: 24 pages, 4 figure
NLO Corrections to the kernel of the BKP-equations
We present results for the NLO kernel of the BKP equations for composite
states of three reggeized gluons in the Odderon channel, both in QCD and in N=4
SYM. The NLO kernel consists of the NLO BFKL kernel in the color octet
representation and the connected kernel, computed in the tree
approximation.Comment: 28 pages, 7 figure
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The Wolf-Rayet population of Westerlund 1
New NTT/SOFI near-IR narrow-band imaging and spectroscopy reveals an additional four Wolf-Rayet (WR) stars in the massive cluster Westerlund 1, bringing the total WR population to 24. Sixteen of the WR stars in Wd1 have been classified WN5–11, while eight are WC8–9. An observed WR to RSG/YHG ratio of ∼3 suggests an age of 4.5–5.0 Myr, with WR stars descended from 40–55MSolar progenitors. On the basis of dust and hard X-ray emission, we estimate that 40–65% are probable members of massive star binary systems
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