9,092 research outputs found
Fast connected component labeling algorithm: a non voxel-based approach
This paper presents a new approach to achieve connected component labeling on both binary images and volumes by using the Extreme Vertices Model (EVM), a representation model for orthogonal
polyhedra, applied to digital images and volume datasets recently. In contrast with previous techniques, this method does not use a voxel-based approach but deals with the inner sections of the object.Postprint (published version
Locating the critical end point using the linear sigma model coupled to quarks
We use the linear sigma model coupled to quarks to compute the effective
potential beyond the mean field approximation, including the contribution of
the ring diagrams at finite temperature and baryon density. We determine the
model couplings and use them to study the phase diagram in the baryon chemical
potential-temperature plane and to locate the Critical End Point.Comment: 8 pages, 2 figures, conference paper from ISMD 201
Polarized 3 parton production in inclusive DIS at small x
Azimuthal angular correlations between produced hadrons/jets in high energy
collisions are a sensitive probe of the dynamics of QCD at small x. Here we
derive the triple differential cross section for inclusive production of 3
polarized partons in DIS at small x using the spinor helicity formalism. The
target proton or nucleus is described using the Color Glass Condensate (CGC)
formalism. The resulting expressions are used to study azimuthal angular
correlations between produced partons in order to probe the gluon structure of
the target hadron or nucleus. Our analytic expressions can also be used to
calculate the real part of the Next to Leading Order (NLO) corrections to
di-hadron production in DIS by integrating out one of the three final state
partons.Comment: 5 pages, 6 figures; version accepted for publication in Physics
Letters
Boundary and expansion effects on two-pion correlation functions in relativistic heavy-ion collisions
We examine the effects that a confining boundary together with hydrodynamical
expansion play on two-pion distributions in relativistic heavy-ion collisions.
We show that the effects arise from the introduction of further correlations
due both to collective motion and the system's finite size. As is well known,
the former leads to a reduction in the apparent source radius with increasing
average pair momentum K. However, for small K, the presence of the boundary
leads to a decrease of the apparent source radius with decreasing K. These two
competing effects produce a maximum for the effective source radius as a
function of K.Comment: 6 pages, 5 Eps figures, uses RevTeX and epsfi
Chiral fermion mass and dispersion relations at finite temperature in the presence of hypermagnetic fields
We study the modifications to the real part of the thermal self-energy for
chiral fermions in the presence of a constant external hypermagnetic field. We
compute the dispersion relation for fermions occupying a given Landau level to
first order in g'^2, g^2 and g_phi^2 and to all orders in g'B, where g' and g
are the U(1)_Y and SU(2)_L couplings of the standard model, respectively, g_phi
is the fermion Yukawa coupling, and B is the hypermagnetic field strength. We
show that in the limit where the temperature is large compared to sqrt{g'B},
left- and right-handed modes acquire finite and different B-dependent masses
due to the chiral nature of their coupling with the external field. Given the
current bounds on the strength of primordial magnetic fields, we argue that the
above is the relevant scenario to study the effects of magnetic fields on the
propagation of fermions prior and during the electroweak phase transition.Comment: 11 pages 4 figures, published versio
On the critical end point in a two-flavor linear sigma model coupled to quarks
We use the linear sigma model coupled to quarks to explore the location of
the phase transition lines in the QCD phase diagram from the point of view of
chiral symmetry restoration at high temperature and baryon chemical potential.
We compute analytically the effective potential in the high- and
low-temperature approximations up to sixth order, including the contribution of
the ring diagrams to account for the plasma screening properties. We determine
the model parameters, namely, the couplings and mass-parameter, from conditions
valid at the first order phase transition at vanishing temperature and, using
the Hagedorn limiting temperature concept applied to finite baryon density, for
a critical baryochemical potential of order of the nucleon mass. We show that
when using the set of parameters thus determined, the second order phase
transition line (our proxy for the crossover transition) that starts at finite
temperature and zero baryon chemical potential converges to the line of first
order phase transitions that starts at zero temperature and finite baryon
chemical potential to determine the critical end point to lie in the region
5.02<\mu_B^{\mbox{CEP}}/T_c<5.18, 0.14, where
is the critical transition temperature at zero baryon chemical potential.Comment: 11 pages, 3 figures, discussion extended, explicit calculations
included in appendices and version accepted for publication in EPJ
Pion Mass Modification in presence of external magnetic field
In this work, the self energies of and up to one loop
order have been calculated in the limit of weak external magnetic field. The
effective masses are explicitly dependent on the magnetic field which are
modified significantly for the pseudoscalar coupling due to weak field
approximation of the external field. On the other hand, for the pseudovector
coupling, there is a modest increment in the effective masses of the pions.
These theoretical developments are relevant for the study of the
phenomenological aspect of mesons in the context of neutron stars as well as
heavy ion collisions.Comment: Published in conference proceedings of DAE-HEP-2016 (XXII DAE High
Energy Physics Symposium, New Delhi, India
Density and expansion effects on pion spectra in relativistic heavy-ion collisions
We compute the pion inclusive momentum distribution in heavy-ion collisions
at AGS energies, assuming thermal equilibrium and accounting for density and
expansion effects at the time of decoupling. We compare to data on mid rapidity
charged pions produced in central Au + Au collisions and find a very good
agreement. The shape of the distribution at low is explained in part as
an effect arising from the high mean pion density achieved in these reactions.
The difference between the positive and negative pion distributions in the same
region is attributed in part to the different average yields of each kind of
charged pions.Comment: Minor changes, typo in Fig. 2b corrected, version to appear in Phys.
Rev.
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