6,413 research outputs found
Structure functions and perturbative hysteresis
We discuss hysteresis effects in the perturbative solution of
renormalization group equations for the strong coupling and parton
distribution functions, and study their impact on precision determinations of proton's deep-inelastic structure functions F2 and FL
NLO QCD corrections to W+W- gamma and Z Z gamma production with leptonic decays
The computation of the NLO QCD corrections to the cross sections for W+W-
gamma and ZZgamma production in hadronic collisions is presented. We consider
the case of a real photon in the final state, but include full leptonic decays
of the W and Z bosons. Numerical results for the LHC and the Tevatron are
obtained through a fully flexible parton level Monte Carlo based on the
structure of the VBFNLO program, allowing an easy implementation of arbitrary
cuts and distributions. We show the dependence on scale variations of the
integrated cross sections and provide evidence that NLO QCD corrections
strongly modify the LO predictions for observables at the LHC both in magnitude
and in shape
NLO QCD corrections to processes with multiple electroweak bosons
The VBFNLO program package is a collection of Monte Carlo programs for the
calculation of NLO QCD corrections to vector boson fusion cross sections,
double and triple vector boson production, or the production of two electroweak
bosons in association with an additional jet. An overview is given of the
processes and features implemented in VBFNLO. WWgamma and Wgamma jet production
are discussed as examples.Comment: 6 pages, 3 figures; talk given at RADCOR 2009 - 9th International
Symposium on Radiative Corrections (Applications of Quantum Field Theory to
Phenomenology), October 25 - 30 2009, Ascona, Switzerlan
Top-mass effects in differential Higgs production through gluon fusion at order \alpha_s^4
Effects from a finite top quark mass on differential distributions in the
Higgs+jet production cross section through gluon fusion are studied at
next-to-leading order in the strong coupling, i.e. . Terms
formally subleading in are calculated, and their influence on the
transverse momentum and rapidity distribution of the Higgs boson are evaluated.
We find that, for the differential K-factor, the heavy-top limit is valid at
the 2-3% level as long as the transverse momentum of the Higgs remains below
about 150 GeV.Comment: 21 pages, 12 figure
Gold-Catalyzed Cascade Reactions of 4H-Furo[3,2-b]indoles with Allenamides: Synthesis of Indolin-3-one Derivatives
Merging the ability of cationic gold(I) catalysts to activate unsaturated \u3c0-systems with the electrophiles driven ring-opening reactions of furans, we describe a new approach to 2-spiroindolin-3-ones from 4H-furo[3,2-b]indoles. The reaction occurs through a cascade sequence involving addition of a gold-activated allene to the furan moiety of the starting furoindole followed by a ring-opening/ring-closing event affording 2-spirocyclopentane-1,2-dihydro-3H-indolin-3-ones in moderate to good yields
Differential Cross Sections for Higgs Boson Production at Tevatron Collider Energies
The transverse momentum distribution is computed for inclusive Higgs
boson production at TeV. We include all-orders resummation of
large logarithms associated with emission of soft gluons at small . We
provide results for Higgs boson and masses from to 200 GeV. The
relatively hard transverse momentum distribution for Higgs boson production
suggests possibilities for improvement of the signal to background ratio.Comment: 12 pages, latex, 7 figure
NLO Higgs boson production plus one and two jets using the POWHEG BOX, MadGraph4 and MCFM
We present a next-to-leading order calculation of Higgs boson production plus
one and two jets via gluon fusion interfaced to shower Monte Carlo programs,
implemented according to the POWHEG method. For this implementation we have
used a new interface of the POWHEG BOX with MadGraph4, that generates the codes
for generic Born and real processes automatically. The virtual corrections have
been taken from the MCFM code. We carry out a simple phenomenological study of
our generators, comparing them among each other and with fixed next-to-leading
order results.Comment: 27 pages, 21 figure
Modifications to the Properties of the Higgs Boson
We explore the impact of new SU(3)XSU(2)XU(1) invariant interactions
characterized by a scale of order a TeV on Higgs boson properties. The Higgs
production rate and branching ratios can be very different from their standard
model values. We also discuss the possibility that these new interactions
contribute to acceptable unification of the gauge couplings.Comment: Minor typos fixed. 8 pages, 5 figure
Heavy-quark mass effects in Higgs boson production at the LHC
We study the impact of heavy-quark masses in Higgs boson production through
gluon fusion at the LHC. We extend previous computations of the fully
differential cross section and of the transverse momentum spectrum of the Higgs
boson by taking into account the finite top- and bottom-quark masses up to
O(alpha_S^3). We also discuss the issues arising when the heavy-quark mass is
much smaller than the Higgs mass. Our results are implemented in updated
versions of the HNNLO and HRes numerical programs.Comment: Minor modifications, results unchanged. Discussion on uncertainties
added. Version published on JHE
- …