53,721 research outputs found
Electron-Hadron Correlations in pp Collisions at \sqrt{s} = 2.76 TeV with the ALICE experiment
In this work we are studying the relative beauty to charm production in pp
collisions at \sqrt{s} = 2.76 TeV, through correlations between electrons from
heavy-flavour decay and charged hadrons, with the ALICE detector at the LHC.
This study represents a baseline for the analysis in heavy-ion collisions where
heavy flavour production is a powerful tool to study the Quark Gluon Plasma
(QGP).Comment: Proceeding of the XII HADRON PHYSICS (2012, Bento Gon\c{c}alvez,
Brazil) conference. 3 Pages, 4 Figure
Measurements of the correlation between electrons from heavy-flavour hadron decays and light hadrons with ALICE at the LHC
In relativistic heavy-ion physics two-particle correlations provide a very
useful tool to investigate the Quark-Gluon Plasma (QGP). This observable is
sensitive to several of the properties of the QGP such as resonances,
interaction of partons with the medium and collective effects (e. g. elliptic
flow). In the present work, the correlation function between electrons from
heavy-flavour hadron decays and light hadrons was measured in pp and Pb-Pb
collisions (central and semi-central). Furthermore, in pp collisions the
relative beauty contribution to the total cross section of electrons from
heavy-flavour decays was estimated by comparing the measured correlation with
Monte-Carlo templates.Comment: Strangeness in Quark Matter 2013 conference proceedin
Measurements of electrons from heavy-flavour hadron decays in pp, p-Pb and Pb-Pb collisions with ALICE at the LHC
Heavy-flavour hadrons, i. e. hadrons carrying charm or beauty quarks, are a
well-suited probe to study the Quark-Gluon Plasma (QGP) in relativistic
heavy-ion collisions. For this reason, measurements of electrons from
heavy-flavour hadron decays have been performed in pp, p-Pb and Pb-Pb
collisions at the LHC with the ALICE detector. Results for the nuclear
modification factors ( and ) support a final-state
energy loss of heavy quarks in central Pb-Pb collisions and, in semi-central
collisions a positive elliptic flow coefficient of electrons from
heavy-flavour hadron decays was observed. Furthermore, a double-ridge structure
was observed in the measured two-particle angular correlation distribution,
triggered by heavy-flavour decay electrons, in high-multiplicity p-Pb
collisions relative to low-multiplicity p-Pb collisions and to pp collisions.Comment: Hard Probes 2013 conference proceedin
Conformal Klein-Gordon equations and quasinormal modes
Using conformal coordinates associated with conformal relativity --
associated with de Sitter spacetime homeomorphic projection into Minkowski
spacetime -- we obtain a conformal Klein-Gordon partial differential equation,
which is intimately related to the production of quasi-normal modes (QNMs)
oscillations, in the context of electromagnetic and/or gravitational
perturbations around, e.g., black holes. While QNMs arise as the solution of a
wave-like equation with a Poschl-Teller potential, here we deduce and
analytically solve a conformal radial d'Alembert-like equation, from which we
derive QNMs formal solutions, in a proposed alternative to more completely
describe QNMs. As a by-product we show that this radial equation can be
identified with a Schrodinger-like equation in which the potential is exactly
the second Poschl-Teller potential, and it can shed some new light on the
investigations concerning QNMs.Comment: 13 pages, 10 figure
A Flexible Implementation of a Matrix Laurent Series-Based 16-Point Fast Fourier and Hartley Transforms
This paper describes a flexible architecture for implementing a new fast
computation of the discrete Fourier and Hartley transforms, which is based on a
matrix Laurent series. The device calculates the transforms based on a single
bit selection operator. The hardware structure and synthesis are presented,
which handled a 16-point fast transform in 65 nsec, with a Xilinx SPARTAN 3E
device.Comment: 4 pages, 4 figures. IEEE VI Southern Programmable Logic Conference
201
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