33,737 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
Relativistic Particle in Complex Space Time
A modified version of the bilocal particle is presented in terms of complex
space time. Unusual constraint structure of the model is studied, and a new
concept of the physical equivalence is proposed in accordance with Dirac's
conjecture. It is found that in the quantum theory the physical state
conditions are compatible with existence of eigenstates of momentum only when
the dimension of space time is four. An example of scattering amplitude is
calculated.Comment: 15 page
BRS Cohomology of a Bilocal Model
We present a model in which a gauge symmetry of a field theory is intrinsic
in the geometry of an extended space time itself. A consequence is that the
dimension of our space time is restricted through the BRS cohomology. If the
Hilbert space is a dense subspace of the space of all square integrable
functions, the BRS cohomology classes are nontrivial only when the
dimension is two or four.Comment: 15 pages, LaTeX. The original title, ``On the Dimension of the Space
time'', is change
Branes and Electric-Magnetic Duality in Supersymmetric QCD
We study the Type IIA limit of the M theory fivebrane configuration
corresponding to N=1 supersymmetric QCD with massless quarks. We identify the
effective gauge coupling constant that fits with
Novikov-Shifman-Veinshtein-Zakharov exact beta function. We find two different
Type IIA limits that correspond to the electric and magnetic descriptions of
SQCD, as observed in the massive case by Schmaltz and Sundrum. The analysis is
extended to the case of symplectic and orthogonal gauge groups. In any of the
cases considered in this paper, the electric and magnetic configurations are
smoothly interpolated via theory. This is in sharp contrast with the
proposed derivation of N=1 duality within the weakly coupled Type IIA string
theory where a singularity is inevitable unless one turns on a parameter that
takes the theory away from an interesting point.Comment: 51 pages, 15 figures, LaTeX, minor correction
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