Conveners
Electromagnetic probes
- Tapan Nayak (Variable Energy Cyclotron Centre (VECC))
Yong Kim
(Massachusetts Inst. of Technology (MIT) Heacy Ion group (CMS))
27/05/2011, 17:30
Electromagnetic probes
Parallel
In studies of the dense medium produced in ultra-relativistic heavy ion collisions, photons are important hard probes, since they are not expected to be modified by the medium. The measurement of isolated prompt photon production in PbPb collisions provides a test of perturbative quantum chromodynamics (pQCD) and the information to constrain the nuclear parton distribution functions. CMS has...
Dr
Antonio Uras
(INFN Cagliari, IPNL Lyon)
27/05/2011, 17:50
Electromagnetic probes
Parallel
The study of the production of low mass vector and pseudoscalar mesons in proton-nucleus collisions represents a natural baseline for the heavy-ion observations, allowing to provide a reference in an environment of cold nuclear matter. In-medium modifications of the vector meson spectral functions were actually predicted to occur also in cold nuclear matter, though the experimental evidence at...
Jason Kamin
(State University of New York at Stony Brook)
27/05/2011, 18:10
Electromagnetic probes
Parallel
Electron-positron pairs are effective probes for investigating the
hot, dense matter created in RHIC collisions because they are carry no
color charge and therefore, once created, do not interact strongly
with the medium. As a result, they retain characteristics of the full
time evolution and dynamics of the system. Among the many features,
the low mass region (m<1 GeV/c2) consists...
Andrej Kugler
(Nuclear Physics Institute)
27/05/2011, 18:30
Electromagnetic probes
Parallel
In the energy domain of 1-2 GeV kinetic energy per nucleon, HADES has been performed systematic studies of electron-positron production in C+C, Ar+KCl, p+p, d+p and p+Nb collisions. Our results demonstrate that electron pair emission in small collision systems, such as C+C, can essentially be explained as a superposition of independent N+N collisions with a dominant contribution from the p-n...
Prof.
Fuming Liu
(Huazhong Normal University)
27/05/2011, 18:50
Electromagnetic probes
Parallel
We predict that direct photon production in pp collisions at 7~TeV
will get at least 10 times enhanced compared to the next to leading
order pQCD predictions, at low transverse momentum ($\pt$ $\lesssim$
10~GeV/c), due to the thermal photon emissions from a quark gluon plasma
(QGP) formed in high multiplicity events. Thus the enhancement of
direct photon production at low $\pt$ can be a...
Dr
Yukinao Akamatsu
(Nagoya University)
27/05/2011, 19:10
Electromagnetic probes
Parallel
We propose a novel relation between the low-mass enhancement of dielectrons observed at PHENIX and transport coefficients of QGP such as the charge diffusion constant D and the relaxation time \tau. The observed low-mass enhancement sets a lower-bound on the diffusion constant, D > 2/T, with T being temperature.
To reach this lower bound, we start with the second-order...
