7,590 research outputs found
Associated production at the LHC: theoretical predictions at NLO+NNLL accuracy
We perform threshold resummation of soft gluon corrections to the total cross
section and the invariant mass distribution for the process .
The resummation is carried out at next-to-next-to-leading-logarithmic (NNLL)
accuracy using the direct QCD Mellin space technique in the three-particle
invariant mass kinematics. After presenting analytical expressions we discuss
the impact of resummation on the numerical predictions for the associated Higgs
boson production with top quarks at the LHC. We find that NLO+NNLL resummation
leads to predictions for which the central values are remarkably stable with
respect to scale variation and for which theoretical uncertainties are reduced
in comparison to NLO predictions.Comment: 21 pages, 9 figures; NNLL results accounting now for color
decomposition of the one-loop hard function, discussion of the literature
added, typos correcte
Improving predictions for associated production at the LHC : soft gluon resummation through NNLL accuracy
In the following we present our recent results on the resummation of soft
gluon corrections to the cross section at the LHC.
The resummation was carried out at next-to-next-to-leading-logarithmic (NNLL)
accuracy using the Mellin space technique. Obtained results were matched to the
NLO cross section. We show that the resummation leads to reduction of
scale-variation uncertainty of the total cross
section.Comment: 6 pages, 1 figure, 1 table, proceedings prepared for the European
Physical Society Conference on High Energy Physics (EPS-HEP 2017), 5-12 July
2017, Venice, Ital
Soft gluon resummation for associated production at the LHC
We perform resummation of soft gluon corrections to the total cross section
for the process . The resummation is carried out at
next-to-leading-logarithmic (NLL) accuracy using the Mellin space technique,
extending its application to the class of processes. We present an
analytical result for the soft anomalous dimension for a hadronic production of
two coloured massive particles in association with a colour singlet. We discuss
the impact of resummation on the numerical prediction for the associated Higgs
boson production with top quarks at the LHC.Comment: 11 pages, 4 figure
Soft gluon resummation for gluon-induced Higgs Strahlung
We study the effect of soft gluon emission on the total cross section
predictions for the associated Higgs production process at the LHC.
To this end, we perform resummation of threshold corrections at the NLL
accuracy in the absolute threshold production limit and in the threshold limit
for production of a system with a given invariant mass. Analytical results
and numerical predictions for various possible LHC collision energies are
presented. The perturbative stability of the results is verified by including
universal NNLL effects. We find that resummation significantly reduces the
scale uncertainty of the contribution, which is the dominant source
of perturbative uncertainty to production. We use our results to evaluate
updated numbers for the total inclusive cross section of associated
production at the LHC. The reduced scale uncertainty of the
component translates into a decrease of the overall scale error by about a
factor of two.Comment: 22 pages, 4 figures, 2 table
Soft gluon resummation for the associated production of a top quark pair with a W boson at the LHC
We present our results on soft gluon resummation in the invariant mass
threshold applied to the associated production of a top quark pair with a W
boson at the LHC in the Mellin space formalism.Comment: 6 pages, 4 figures, 1 table, proceedings prepared for the European
Physical Society Conference on High Energy Physics (EPS-HEP 2017), 5-12 July
2017, Venice, Ital
A Concurrency-Optimal Binary Search Tree
The paper presents the first \emph{concurrency-optimal} implementation of a
binary search tree (BST). The implementation, based on a standard sequential
implementation of an internal tree, ensures that every \emph{schedule} is
accepted, i.e., interleaving of steps of the sequential code, unless
linearizability is violated. To ensure this property, we use a novel read-write
locking scheme that protects tree \emph{edges} in addition to nodes.
Our implementation outperforms the state-of-the art BSTs on most basic
workloads, which suggests that optimizing the set of accepted schedules of the
sequential code can be an adequate design principle for efficient concurrent
data structures
Associated top-pair production with a heavy boson production through NLO+NNLL accuracy at the LHC
In this talk we present results of our recent calculations of cross sections
and distributions for the associate production of top-antitop quark pairs with
a heavy boson (Higgs, W, Z) at the LHC, obtained using threshold resummation in
direct QCD, i.e. in the Mellin-space approach.Comment: 4 pages, 6 figures, contribution to the 2019 QCD session of the 54th
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Trade and ethnozoological use of African lorisiformes in the last 20 years
Trade in primates is considered a major impediment to primate conservation globally. The bushmeat trade in West and Central Africa is considered largely unsustainable and represents one of the main threats to biodiversity. Furthermore, the use of primates in traditional practices and medicine includes a third of the African primate species. Little is known about the trade in the African mainland lorisiforms; pottos, angwantibos and galagos. Aiming to fill this knowledge gap we created an online survey, conducted a literature review, and analyzed CITES trade records, focusing on the last two decades. We obtained 188 questionnaire responses from researchers and people working in 31 different countries in sub-Saharan Africa. We found a total of 33 publications reporting on trade in African lorisiforms, and CITES records indicate that almost 2000 lorisiforms were traded internationally from African range countries. Fifty-three percent of respondents provided meaningful details about aspects of the trade in African lorisiforms from 50% of the range countries. Galagos were reported by respondents in larger numbers than pottos and angwantibos, and mainly occurred in the pet trade. Pottos were the most frequently mentioned taxon in the literature, when all trade types were combined. Across all of the sources (online survey, literature and CITES database), trade in pottos and angwantibos was reported from 12 countries, and galagos from 23 countries. Trade was reported to occur mainly within rural settings (64%), potentially indicating that demand is not high enough to fuel long distance trading. However, as seen in the Asian lorisiforms, once quantitative studies were conducted, the threat that trade posed became alarmingly apparent and is now considered a major impediment to their conservation. Our insight into the trade of African lorisiforms should be followed up with concerted studies, with an emphasis on quantifying trade to the species level
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