171 research outputs found
Semileptonic decays of the Higgs boson at the Tevatron
We examine the prospects for extending the Tevatron reach for a Standard
Model Higgs boson by including the semileptonic Higgs boson decays h --> WW -->
l nu jj for M_h >~ 2 M_W, and h --> W jj --> l nu jj for M_h <~ 2 M_W, where j
is a hadronic jet. We employ a realistic simulation of the signal and
backgrounds using the Sherpa Monte Carlo event generator. We find kinematic
selections that enhance the signal over the dominant W+jets background. The
resulting sensitivity could be an important addition to ongoing searches,
especially in the mass range 120 <~ M_h <~ 150 GeV. The techniques described
can be extended to Higgs boson searches at the Large Hadron Collider.Comment: 68 pages, 19 figure
A Forward Branching Phase-Space Generator
We develop a forward branching phase-space generator for use in
next-to-leading order parton level event generators. By performing 2 -> 3
branchings from a fixed jet phase-space point, all bremsstrahlung events
contributing to the given jet configuration are generated. The resulting
phase-space integration is three-dimensional irrespective of the considered jet
multiplicity. In this first study, we use the forward branching phase-space
generator to calculate in the leading-color approximation next-to-leading order
corrections to fully differential gluonic jet configurations.Comment: 35 pages, 5 figures, 1 tabl
Model-Independent Production of a Top-Philic Resonance at the LHC
We investigate the collider phenomenology of a color-singlet vector
resonance, which couples to the heaviest quarks, the top quarks, but very
weakly to the rest of the fermions in the Standard Model. We find that the
dominant production of such a resonance does not appear at the tree level -- it
rather occurs at the one-loop level in association with an extra jet.
Signatures like t anti-t plus jets readily emerge as a result of the subsequent
decay of the resonance into a pair of top quarks. Without the additional jet,
the resonance can still be produced off-shell, which gives a sizeable
contribution at low masses. The lower top quark multiplicity of the loop
induced resonance production facilitates its reconstruction as compared to the
tree level production that gives rise to more exotic signatures involving three
or even four top quarks in the final state. For all these cases, we discuss the
constraints on the resonance production stemming from recent experimental
measurements in the top quark sector. We find that the top-philic vector
resonance remains largely unconstrained for the majority of the parameter
space, although this will be scrutinized closely in the Run 2 phase of the LHC.Comment: 32 pages, 16 figure
From loops to trees by-passing Feynman's theorem
We derive a duality relation between one-loop integrals and phase-space
integrals emerging from them through single cuts. The duality relation
is realized by a modification of the customary +i0 prescription of the
Feynman propagators. The new prescription regularizing the propagators,
which we write in a Lorentz covariant form, compensates for the absence
of multiple-cut contributions that appear in the Feynman Tree Theorem.
The duality relation can be applied to generic one-loop quantities in
any relativistic, local and unitary field theories.
It is suitable for applications to the analytical calculation of
one-loop scattering amplitudes, and to the numerical evaluation of
cross-sections at next-to-leading order.Peer reviewe
Globally distributed iridium layer preserved within the Chicxulub impact structure
The Cretaceous-Paleogene (K-Pg) mass extinction is marked globally by elevated concentrations of iridium, emplaced by a hypervelocity impact event 66 million years ago. Here, we report new data from four independent laboratories that reveal a positive iridium anomaly within the peak-ring sequence of the Chicxulub impact structure, in drill core recovered by IODP-ICDP Expedition 364. The highest concentration of ultrafine meteoritic matter occurs in the post-impact sediments that cover the crater peak ring, just below the lowermost Danian pelagic limestone. Within years to decades after the impact event, this part of the Chicxulub impact basin returned to a relatively low-energy depositional environment, recording in unprecedented detail the recovery of life during the succeeding millennia. The iridium layer provides a key temporal horizon precisely linking Chicxulub to K-Pg boundary sections worldwide
Reply to Nielsen et al. social mindfulness is associated with countries’ environmental performance and individual environmental concern
info:eu-repo/semantics/publishedVersio
From local social mindfulness to global sustainability efforts?
info:eu-repo/semantics/publishedVersio
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