8,427 research outputs found
New Results on Hard Probes in Heavy-Ion Collisions with ALICE
Hard probes - final state particles related to an interaction with large
momentum transfer or mass scale - play a distinguished role in the discovery
and the study of the Quark-Gluon Plasma (QGP), a phase of deconfined quarks and
gluons reached at high temperatures in heavy ion collisions. In heavy ion
collisions, parton scatterings with a large momentum transfer (
fm/) occur prior to QGP formation and thus provide a source of coloured
probe particles for the QGP created in the later stage of the reaction. The
hard scattered partons and the subsequent parton shower interact strongly with
the QGP and its constituents via elastic and radiative processes before
hadronization into jets of observable particles. Thus, the comparison to jet
and high- observables in pp (vacuum) potentially probes their modification
due to medium effects. One of the key observables in the discovery and
investigation of these jet modifications has been the nuclear modification
factor , for which new results on charged particle production in
different colliding systems are presented and the question of apparant
suppression in peripheral Pb-Pb collisions is addressed. Fore more differential
studies of the jet sub-structure and hence the parton shower evolution in the
medium, recent results on jet grooming in heavy ion colisions are presented.Comment: Dedicated to Oliver Busch (1976-2018), 6 pages, 4 figures,
proceedings of the Sixth Annual Conference on Large Hadron Collider Physics
LHCP 2018, Bologn
Geometrical Scaling of Direct-Photon Production in Hadron Collisions from RHIC to the LHC
We consider pp, dAu and AuAu production of photons at RHIC energies, and PbPb
collisions at LHC energy. We show that the inclusive spectrum of photons in the
transverse momentum range of 1 GeV < pT <= 4 GeV satisfies geometric scaling.
Geometric scaling is a property of hadronic interactions predicted by theories
of gluon saturation, and expresses rates in terms of dimensionless ratios of
the transverse momentum to saturation momentum. We show excellent agreement
with geometric scaling with the only input being the previously measured
dependence of the saturation momentum upon Bjorken x and centrality.Comment: 12 pages, 4 figure
Technical Analysis as a Method of Risk Management
While the academic world is still discussing if charting works or if it is more or less something like "Voodoo finance", the practical orientated world has been using technical analysis for decades. One argument of practitioners is, that technical analysis is useful to "disciplinate" the trader and consequently is a method of risk reduction. We discuss this argument theoretically and empirically and show, that it is not always right. --
Effects of the IFRS introduction: perspective from an early stadium to the time after the mandatory adoption
Regulators' expectations to the IFRS introduction are high. In our analyses we measure by different variables for market liquidity how inter alia reporting quality and investors' preference developed with IFRS adopter and non IFRS adopter firms over the years, starting in the time of the early adoption. The results from around 35,000 firm year observations in eleven countries show that only particular adopter firms generally show higher liquidity values over the years. Overall we can observe a clear trend. Market liquidity values are significantly higher for IFRS adopter firms during the years before 2005, the year in which reporting of consolidated accounts according to IFRS became mandatory for basically all publicly traded companies within the European Union and several other countries. Predominantly these values decrease over the years and turn into an advance for non IFRS adopter firms in the years after the mandatory adoption. Concluding, the results are supportive for the investors' long term preference, after distorting influences during the adoption years, for the non IFRS adopter firms. --
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