897 research outputs found
Multiple cyclical fractional structures in financial time series
This paper analyses multiple cyclical structures in financial time series. In particular, we focus on the monthly structure of the Nasdaq, the Dow Jones and the Standard&Poor stock market indices. The three series are modelled as long-memory processes with poles in the spectrum at multiple frequencies, including the long-run or zero frequency
BFKL predictions for inclusive three jet production at the LHC
We define new observables sensitive to BFKL dynamics in the context of
multijet production at the large hadron collider (LHC). We propose the study of
the inclusive production of three jets well separated in rapidity from each
other, with two of them being very forward. We show that the tagging of a third
jet in the central region of rapidity allows for a very strong test of the BFKL
formalism. In particular, we have studied two projections on azimuthal angles
for the differential cross section which allow for the definition of many
different observables whose behavior when varying the and rapidity of the
central jet is a distinct signal of BFKL dynamics. In order to reduce the
theoretical uncertainties and influence of higher order corrections, we propose
the study of ratios of correlation functions of products of cosines of
azimuthal angle differences among the tagged jets.Comment: 11 pages, 2 figure
Multi-Regge kinematics and azimuthal angle observables for inclusive four-jet production
We evaluate differential cross sections for production of four jets in
multi-Regge kinematics at a hadron collider. The main focus lies on azimuthal
angle dependences. As in previous studies, the ratios of correlation functions
of products of cosines of azimuthal angle differences among the tagged jets
offer us the cleanest quantities to compare with experimental data. The
calculations are based on the jet production from a single BFKL ladder with a
convolution of three BFKL Green functions where we always have two
forward/backward jets tagged in the final state. We also demand the tagging of
two further jets in more central regions of the detectors with a relative
separation in rapidity from each other, plus the inclusive production of an
arbitrary number of mini-jets. We show that dependences on the transverse
momenta and rapidity of the two central jets can be a distinct signal of the
onset of BFKL dynamics.Comment: 13 pages, 4 figure
Inclusive Four-jet Production at 7 and 13 TeV: Azimuthal Profile in Multi-Regge Kinematics
Recently, new observables in LHC inclusive events with three tagged jets were
proposed. Here, we extend that proposal to events with four tagged jets. The
events are characterised by one jet in the forward direction, one in the
backward direction with a large rapidity distance from the first one and
two more jets tagged in more central regions of the detector. In our setup,
non-tagged associated mini-jet multiplicity is present and needs to be
accounted for by the inclusion of BFKL gluon Green functions. The projection of
the cross section on azimuthal-angle components opens up the opportunity for
defining new ratios of correlation functions of the azimuthal angle differences
among the tagged jets that can be used as probes of the BFKL dynamics.Comment: 19 pages, 8 figures; v2: published versio
Probing the BFKL dynamics in inclusive three jet production at the LHC
We propose the study of new observables in LHC inclusive events with three
tagged jets, one in the forward direction, one in the backward direction and
both well-separated in rapidity from the each other (Mueller-Navelet jets),
together with a third jet tagged in central regions of rapidity. Since
non-tagged associated mini-jet multiplicity is allowed, we argue that
projecting the cross sections on azimuthal-angle components can provide several
distinct tests of the BFKL dynamics. Realistic LHC kinematical cuts are
introduced.Comment: 8 pages. Talk given by G. Chachamis at the 5th International
Conference on New Frontiers in Physics (ICNFP2016), 6-14 July 2016,
Kolymbari, Crete, Greec
BFKL Azimuthal Imprints in Inclusive Three-jet Production at 7 and 13 TeV
We propose the study of new observables in LHC inclusive events with three
tagged jets, one in the forward direction, one in the backward direction and
both well-separated in rapidity from the each other (Mueller-Navelet jets),
together with a third jet tagged in central regions of rapidity. Since
non-tagged associated mini-jet multiplicity is allowed, we argue that
projecting the cross sections on azimuthal-angle components can provide several
distinct tests of the BFKL dynamics. Realistic LHC kinematical cuts are
introduced.Comment: 17 pages, 7 figure
Azimuthal-angle Observables in Inclusive Three-jet Production
We discuss the impact of corrections beyond the leading-logarithmic accuracy
on some recently proposed LHC observables that are based on azimuthal-angle
ratios in a kinematical setup that is an extension to the usual one for
Mueller-Navelet jets, after requiring an extra tagged jet in central regions of
rapidity. The corrections tend to be mild which suggests that these observables
are an excellent way to probe the onset of BFKL effects at hadronic colliders.Comment: 6 pages, presented by G. Chachamis at the 25th International Workshop
on Deep Inelastic Scattering and Related Topics, 3-7 April 2017, Birmingham,
U
STOCK MARKET DEVELOPMENT AND ECONOMIC GROWTH: THE CAUSAL LINKAGE
This paper addresses the question: does stock market development cause growth? It examines the causal linkage between stock market development, financial development and economic growth. The argument is that any inference that financial liberalisation causes savings or investment or growth, or that financial intermediation causes growth, drawn from bivariate causality tests may be invalid, as invalid causality inferences can result from omitting an important variable. The empirical part of this study exploits techniques recently developed by Toda and Yamamoto (1995) to test for causality in VARs, and emphasises the possibility of omitted variable bias. The evidence obtained from a sample of seven countries suggests that a well-developed stock market can foster economic growth in the long run. It also provides support to theories according to which well-functioning stock markets can promote economic development by fuelling the engine of growth through faster capital accumulation, and by tuning it through better resource allocation.Financial Development, Economic Growth, Stock Market, Causality Testing, VARs, Incomplete Systems
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