26,637 research outputs found
Mixed harmonic charge dependent azimuthal correlations in Pb-Pb collisions at = 2.76 TeV measured with the ALICE experiment at the LHC
Mixed harmonic charge dependent azimuthal correlations at mid-rapidity in
Pb-Pb collisions at = 2.76 TeV were measured with the ALICE
detector at the LHC. A clear charge dependence for a series of correlations is
observed both via the multi-particle cumulant and the event plane methods.
Implications from these measurements for the possible effects of the local
parity violation in QCD and for models which incorporate the azimuthal
anisotropic flow and the local charge conservation on the kinetic freeze-out
surface are discussed.Comment: 4 pages, 7 figures, Proceedings for Quark Matter 2012, Washington
D.C., Augest 13-18, 201
Electroweak Sudakov effect on processes at TeV scale
In Next Linear Colliders at TeV scale, electroweak double logarithmic
corrections, which come from the infrared behaviors of theory can not be
neglected. It is well known that in QED and QCD, double logarithmic corrections
are resummed to all orders, and these corrections can be exponentiated,
resulting in the Sudakov form factor. However it is never trivial that double
logarithmic corrections in electroweak theory can be exponentiated, because of
the spontaneous breaking of symmetry and the pattern of that. We discuss the
electroweak double logarithmic corrections at two loop level and explain the
differences of ``Soft'' structure between the electroweak theory and QCD (the
unbroken non-abelian gauge theory).Comment: 5 pages, 17 figures;Talk presented at Theory Meeting on Physics at
Linear Colliders, March 15 - 17, 2001, KEK, Japa
Directed search, rationing and wage dispersion
This paper develops a microeconomic model of directed search, where firms are heterogeneous in the number of vacancies advertised, and wages affect workers' choices when both applying for jobs and accepting a job. An aggregate matching function is derived, which incorporates workers' preferences for firms. The aggregate level of matches is shown to be independent of the workers' preferences in the job acceptance stage. When firms' labor demands are heterogeneous, the matching market equilibrium outcome is suboptimal. Matching efficiency is, however, attained in equilibrium, when wages are employed as a rationing device. This results in wage dispersion, despite workers being homogeneous
Mixed harmonic azimuthal correlations in Pb--Pb collisions at \sqrt{s_{NN}}=2.76TeV measured with the ALICE experiment at the LHC
Mixed harmonic charge dependent azimuthal correlations at mid-rapidity in
Pb-Pb collisions at \sqrt{s_{NN}} = 2.76 TeV were measured with the ALICE
detector at the LHC. A clear charge dependence for a series of correlations is
observed both via the multi-particle cumulant and the event plane methods.
Implications from these measurements for the possible effects of local parity
violation in QCD and for models which incorporate azimuthal anisotropic flow
and "effective" local charge conservation on the kinetic freeze-out surface are
discussed.Comment: 6 pages, 5 figures, proceedings of International symposium on
multiparticle dynamics 2012 (ISMD2012
Calculation of transition probabilities and ac Stark shifts in two-photon laser transitions of antiprotonic helium
Numerical ab initio variational calculations of the transition probabilities
and ac Stark shifts in two-photon transitions of antiprotonic helium atoms
driven by two counter-propagating laser beams are presented. We found that
sub-Doppler spectroscopy is in principle possible by exciting transitions of
the type (n,L)->(n-2,L-2) between antiprotonic states of principal and angular
momentum quantum numbers n~L-1~35, first by using highly monochromatic,
nanosecond laser beams of intensities 10^4-10^5 W/cm^2, and then by tuning the
virtual intermediate state close (e.g., within 10-20 GHz) to the real state
(n-1,L-1) to enhance the nonlinear transition probability. We expect that ac
Stark shifts of a few MHz or more will become an important source of systematic
error at fractional precisions of better than a few parts in 10^9. These shifts
can in principle be minimized and even canceled by selecting an optimum
combination of laser intensities and frequencies. We simulated the resonance
profiles of some two-photon transitions in the regions n=30-40 of the
\bar{p}^4He^+ and \bar{p} ^3He^+ isotopes to find the best conditions that
would allow this.Comment: 18 pages 2 tables 12 figures, submitted to Phys. Rev.
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