30,956 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
Approximate solution for Fokker-Planck equation
In this paper, an approximate solution to a specific class of the
Fokker-Planck equation is proposed. The solution is based on the relationship
between the Schr\"{o}dinger type equation with a partially confining and
symmetrical potential. To estimate the accuracy of the solution, a function
error obtained from the original Fokker-Planck equation is suggested. Two
examples, a truncated harmonic potential and non-harmonic polynomial, are
analyzed using the proposed method. For the truncated harmonic potential, the
system behavior as a function of temperature is also discussed.Comment: 12 pages, 8 figure
Household income as a determinant of child labor and school enrollment in Brazil: Evidence from a social security reform
This paper studies the effects of household income on labor participation and school enrollment of children aged 10 to 14 in Brazil using a social security reform as a source of exogenous variation in household income. We find that increased benefits are associated with increases in school enrollment for girls, as well as a smaller reduction in their labor participation, but find no effects for boys. We also uncover evidence that the gender of the benefit receiver matters for girls’ labor variables: only benefits received by females reduce girls’ work.social security reform, child labor, family, school enrollment, old-age benefits, Brazil
Three-dimensional quantum electrodynamics as an effective interaction
We obtain a Quantum Electrodynamics in 2+1 dimensions by applying a
Kaluza--Klein type method of dimensional reduction to Quantum Electrodynamics
in 3+1 dimensions rendering the model more realistic to application in
solid-state systems, invariant under translations in one direction. We show
that the model obtained leads to an effective action exhibiting an interesting
phase structure and that the generated Chern--Simons term survives only in the
broken phase.Comment: 10 pages in Plain Te
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