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- National Academy of Sciences
- In: JORNADA CIENTÍFICA EMBRAPA MANDIOCA E FRUTICULTURA, 4., 2010, Cruz das Almas. [Anais...]. Cruz das Almas: Embrapa Mandioca e Fruticultura, 2010. (Embrapa Mandioca e Fruticultura. Documentos, 190). 1 CD-ROM. PDF.
- George A. Smathers Libraries, University of Florida; George A. Smathers Libraries, University of Florida ( Gainesville, FL )
- http://www.icer2007.msu.ac.th/paper/ICT7.pdf
- Washington, DC
- Universidade Nacional Autônoma do México
- Corporação de Fomento da Produção
- Universidade Cornell
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Resultados filtrados por Publicador: Universidade Cornell

## Impact of PDF uncertainties at large x on heavy boson production

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

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We explore the sensitivity of W and Z boson production in hadronic collisions
to uncertainties in parton distribution functions (PDFs) at large x arising
from uncertainties in nuclear corrections when using deuterium data in global
QCD fits. The W and Z differential cross sections show increasing influence of
nuclear corrections at high boson rapidities, particularly for the d quark,
which is diluted somewhat in the decay lepton rapidity distributions. The
effects of PDF uncertainties on heavy W' and Z' bosons beyond the Standard
Model become progressively more important for larger boson masses or
rapidities, both in p-p collisions at the LHC and in p-pbar scattering at the
Tevatron.; Comment: 23 pages, 9 figures; to appear in JHEP

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## PDF model based on Langevin equation for polydispersed two-phase flows applied to a bluff-body gas-solid flow,

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 17/08/2010
Português

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The aim of the paper is to discuss the main characteristics of a complete
theoretical and numerical model for turbulent polydispersed two-phase flows,
pointing out some specific issues. The theoretical details of the model have
already been presented [Minier and Peirano, Physics Reports, Vol. 352/1-3, 2001
]. Consequently, the present work is mainly focused on complementary aspects,
that are often overlooked and that require particular attention. In particular,
the following points are analysed : the necessity to add an extra term in the
equation for the velocity of the fluid seen in the case of twoway coupling, the
theoretical and numerical evaluations of particle averages and the fulfilment
of the particle mass-continuity constraint. The theoretical model is developed
within the PDF formalism. The important-physical choice of the state vector
variables is first discussed and the model is then expressed as a stochastic
differential equation (SDE) written in continuous time (Langevin equations) for
the velocity of the fluid seen. The interests and limitations of Langevin
equations, compared to the single-phase case, are reviewed. From the numerical
point of view, the model corresponds to an hybrid Eulerian/Lagrangian approach
where the fluid and particle phases are simulated by different methods.
Important aspects of the Monte Carlo particle/mesh numerical method are
emphasised. Finally...

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## Including heavy quark production in ZEUS-PDF fits

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 13/08/2008
Português

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At HERA heavy quarks may contribute up to 30% of the structure function
$F_2$. The potential of including heavy-quark data in the ZEUS PDF fits is
explored, using $D^*$ double differential cross-sections as well as the
inclusive quantities $F_2^{c\bar{c}}$, $F_2^{c\bar{c}}$. The introduction of
heavy quarks requires an extension of the DGLAP formalism. The effect of using
different heavy flavour number schemes, and different approaches to the running
of $\alpha_s$, are compared.; Comment: 4 pages, 4 figures. To be published in the Proceedings of the 16th
International Workshop on Deep Inelastic Scattering, DIS2008, London, April
7-11th 2008

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## Soft-Gluon Resummation and PDF Theory Uncertainties

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 11/02/2000
Português

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Parton distribution functions are determined by the comparison of
finite-order calculations with data. We briefly discuss the interplay of higher
order corrections and PDF determinations, and the use of soft-gluon resummation
in global fits.; Comment: Contribution to the proceedings of the workshop ``Physics at Run
II'', Fermilab, 1999; 6 Pages, LaTeX, two figures as eps files

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## Prospects for measurements of $W^{\pm}$ boson production in association with jets at LHCb, and PDF constraints at large-$x$

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 06/05/2015
Português

Relevância na Pesquisa

239.24152%

The unique forward LHCb acceptance opens the possibility for performing
precision Standard Model (SM) processes in a kinematical regime beyond the
reach of both ATLAS and CMS experiments. In this article we discuss the
feasibility of performing $W^{\pm}j$ measurements with 14 TeV LHCb data. In
particular, we find that the leptonic asymmetry at high pseudorapidity, with
appropriate cuts on the associated jet, is sensitive to the $d$ quark PDF in a
region of Bjorken $x > 0.5$. We also comment on the impact of fiducial and
normalised cross section measurements.; Comment: 4.5 pages + references, 5 figures

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## Strange Quark PDF Uncertainty and its Implications for W/Z Production at the LHC

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

Relevância na Pesquisa

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We investigate the impact of parton distribution functions (PDFs)
uncertainties on W/Z production at the LHC, concentrating on the strange quark
PDF. Additionally we examine the extent to which precise measurements at the
LHC can provide additional information on the proton flavor structure.; Comment: Presented at Light Cone 2012, July 2012, Krakow, Poland, added
references

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## PDF modeling of near-wall turbulent flows: A New model, Weak second-order scheme and a numerical study in a Hybrid configuration

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Publicado em 12/09/2010
Português

Relevância na Pesquisa

239.24152%

In this work, we discuss some points relevant for stochastic modelling of
one- and two-phase turbulent flows. In the framework of stochastic modelling,
also referred to PDF approach, we propose a new Langevin model including all
viscosity effects and thus that is consistent with viscous Navier-Stokes
equations. In the second part of the work, we show how to develop a
second-order unconditionally stable numerical scheme for the stochastic
equations proposed. Accuracy and consistency of the numerical scheme is
demonstrated analytically. In the last part of the work, we study the fluid
flow in a channel flow with the proposed viscous method. A peculiar approach is
chosen: the flow is solved with a Eulerian method and after with the Lagrangian
model proposed which uses some of the Eulerian quantities. In this way
attention is devoted to the issue of consistency in hybrid Eulerian/Lagrangian
methods. It is shown that the coupling is important indeed and that to couple
the Lagrangian model to an Eulerian one which is not consistent with the same
turbulence physics leads to large errors. This part of the work complements a
recent article [Chibbaro and Minier International Journal of Multiphase flows
submitted (arXiv:0912.2045)]; Comment: 39 pages...

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## Multifractal PDF analysis for intermittent systems

Fonte: Universidade Cornell
Publicador: Universidade Cornell

Tipo: Artigo de Revista Científica

Português

Relevância na Pesquisa

239.24152%

The formula for probability density functions (PDFs) has been extended to
include PDF for energy dissipation rates in addition to other PDFs such as for
velocity fluctuations, velocity derivatives, fluid particle accelerations,
energy transfer rates, etc, and it is shown that the formula actually explains
various PDFs extracted from direct numerical simulations and experiments
performed in a wind tunnel. It is also shown that the formula with appropriate
zooming increment corresponding to experimental situation gives a new route to
obtain the scaling exponents of velocity structure function, including
intermittency exponent, out of PDFs of velocity fluctuations.; Comment: 10 pages, 5 figures

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