206 research outputs found
First global QCD analysis of charged hadron fragmentation functions and their uncertainties at next-to-next-to-leading order
In this paper, we present FFs, a first global QCD analysis of
parton-to-{\it unidentified} charged hadrons fragmentation functions (FFs) at
next-to-next-to-leading order (NNLO) accuracy in perturbative QCD. This
analysis is based on single-inclusive charged hadron production in
electron-positron () annihilation. The uncertainties in the extraction
of FFs as well as the corresponding observables are estimated
using the "Hessian" technique. We study the quality of the {\tt SGK18} FFs
determined in this analysis by comparing with the recent results in literature.
We also show how {\tt SGK18} FFs results describe the available data for
single-inclusive unidentified charged hadron production in
annihilation. We demonstrate that the theoretical uncertainties due to the
variation of the renormalization and factorization scales improve when NNLO QCD
corrections are considered. We find that the resulting {\tt SGK18} FFs are in
good agreement with all data analyzed and the inclusion of NNLO corrections
tends to improve the data description with somewhat smaller uncertainty.Comment: 17 pages, 6 figures and 3 Table
Impact of unidentified light charged hadron data on the determination of pion fragmentation functions
In this paper a new comprehensive analysis of parton-to-pion fragmentation
functions (FFs) is performed for the first time by including all experimental
data sets on single inclusive pion as well as unidentified light charged hadron
production in electron-positron () annihilation. We determine the pion
FFs along with their uncertainties using the standard "Hessian" technique at
next-to-leading order (NLO) and next-to-next-to leading order (NNLO) in
perturabative QCD. It is shown that the determination of pion FFs using
simultaneously the data sets from pion and unidentified light charged hadron
productions leads to the reduction of all pion FFs uncertainties especially for
the case of strange quark and gluon FFs by significant factors. In this study,
we have quantified the constraints that these data sets could impose on the
extracted pion FFs. Our results also illustrate the significant improvement in
the precision of FFs fits achievable by inclusion of higher order corrections.
The improvements on both FFs uncertainties as well as fit quality have been
clearly discussed.Comment: 34 pages, 9 figures and 3 table
Symmetry breaking effect on determination of polarized and unpolarized parton distributions
We perform a new extraction for unpolarized and polarized parton distribution
functions considering a flavor decompositions for sea quarks and applying very
recent deep inelastic scattering (DIS) and semi inclusive deep inelastic
scattering (SIDIS) data in the fixed flavor number scheme (FFNS) framework. In
the new symmetry breaking scenario the light quark and antiquark densities are
extracted separately and new parametrization forms are determined for them. The
heavy flavors contribution, including charm and bottom quarks, are also taken
to be account for unpolarized distributions.Comment: Talk presented at 16th International QCD Conference (QCD12),
Montpellier, France, July 2- 7, 2012. Submitted to Nuc. Phys. (Proc. Suppl.),
4 pages, 4 figure
Probing top quark FCNC couplings in the triple-top signal at the high energy LHC and future circular collider
Our main aim in this paper is to present detailed studies to probe the top
quark flavor changing neutral current (FCNC) interactions at , ,
and vertices in the triple-top
signal at the high energy proposal of
Large Hadron Collider (HE-LHC) and future circular hadron-hadron collider
(FCC-hh). To this end, we investigate the production of three top quarks which
arises from the FCNC couplings taken into account the fast simulation at
TeV of HE-LHC and 100 TeV of FCC-hh considering the integrated
luminosities of 10, 15 and 20 ab. All the relevant backgrounds are
considered in a cut based analysis to obtain the limits on the anomalous
couplings and the corresponding branching ratios. The obtained exclusion limits
on the coupling strengths and the branching ratios are summarized and compared
in details with the results in the literature, namely the most recent direct
LHC experimental limits and HL-LHC projections as well. We show that, for
higher energy phase of LHC, a dedicated search for the top quark FCNC couplings
can achieve much better sensitivities to the triple-top signal than other top
quark production scenarios. We found that the limits for the branching ratios
of and transitions could reach an impressive sensitivity and the
obtained 95\% CL limits are at least three orders of magnitude better than the
current LHC experimental results as well as the existing projections of HL-LHC.Comment: 18 pages, 8 figures and 6 Tables; Final version accepted for
publication in Nuclear Physics
MPLS layer 3 VPN
Trabalho final de mestrado para obtenção do grau de Mestre em Engenharia de Electrónica e TelecomunicaçõesMultiprotocol Label Switching (MPLS) is the principal technology used in Service Provider.
Networks as this mechanism forwarding packet quickly. MPLS is a new way to increase the speed,
capability and service supplying abilities for optimization of transmission resources. Service Provider
networks use this technology to connect different remote sites. MPLS technology provides lower
network delay, effective forwarding mechanism, ascendable and predictable performance of the
services which makes it more appropriate for carry out real-time applications such as Voice and video.
MPLS can be used to transport any type of data whether it is layer 2 data such as frame relay, Ethernet,
ATM data etc. or layer 3 data such as IPV4, IPV6.Multiprotocol Label Switching (MPLS) é a principal tecnologia usada no Service Provider.
Redes como este mecanismo fazem o encaminhamento de pacotes de dados rapidamente. MPLS é uma nova maneira de aumentar a velocidade, a capacidades de fornecimento, a capacidade de serviço para otimização de recursos de transmissão. As redes Service Provider usam essa tecnologia para ligar diferentes sites remotos. A tecnologia MPLS oferece menor atraso de rede, mecanismo de encaminhamento eficaz, desempenho e serviços previsÃveis o que o tornam mais apropriado para executar aplicativos em tempo real, como voz e vÃdeo.
O MPLS pode ser usado para transportar qualquer tipo de dados, seja dados de camada 2, como frame relay, Ethernet, dados ATM, etc., ou dados da camada 3, como IPV4, IPV6.N/
Single top quark production as a probe of anomalous and couplings at the FCC-ee
In this paper, a detailed study to probe the top quark Flavour-Changing
Neutral Currents (FCNC) and at the future
collider FCC-ee in three different center-of-mass energies of 240, 350 and 500
GeV is presented. A set of useful variables are proposed and used in a
multivariate technique to separate signal from standard model background
processes. The study includes a fast detector simulation based on the {\sc
delphes} package to consider the detector effects. The discovery
regions and the upper limits on the FCNC branching ratios at 95\% confidence
level (CL) in terms of the integrated luminosity are presented. It is shown
that with 300 fb of integrated luminosity of data, FCC-ee would be able
to exclude the effective coupling strengths above
which is corresponding to branching fraction of \%. We
show that moving to a high-luminosity regime leads to a significant improvement
on the upper bounds on the top quark FCNC couplings to a photon or a boson.Comment: 21 Pages, 6 Figures, 8 Table
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