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Background and Motivation Di-lepton spectra from HIC Sensitivity to EOS Summary and conclusion arXiv: 1009.3091. Di-lepton production in strongly coupled quark gluon plasma. Jian Deng ( 邓建 ) USTC with Qun Wang, Nu Xu , Pengfei Zhuang 2010-10-19 ATHIC2010 @CCNU. We want to know.
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JianDeng (邓建) USTC
with Qun Wang,Nu Xu, PengfeiZhuang
2010-10-19 ATHIC2010 @CCNU
Because of confinement, we saw no free quarks.
Can we observe QGP directly?
we know there is a cross-over from partonic phase to hadronic phase.
Electromagnetic signals have their advantages to probe the strongly coupled media.
The dilepton signal is an excellent candidate of the electromagnetic probe.
some amazing results opened another window to understand strong interacting matter.
NA60 observed a significant excess of pairs above the yield expected from neutral meson decay
SPS NA60 96, 162302 (2006)
RHIC PHENIX arXiv:0711.2118
A strong broadening but essentially no shift in mass of rho meson spectrum is needed to explain this result
Slope parameter T-eff (MeV)
T_eff gives the information of the random thermal motion and the collective flow of the thermal source.
The transition to a low-flow
region may signal a transition
from a hadronic source to
a partonic source
NA60, PRL100, 022302(2008)
Out work is try to understand this results and predict what we will get in higher energy collision such as RHIC.
Initial high Q2
Partonic matter - QGP
- The hot-QCD
Hard scattering production - QCD prediction
Interactions with medium - deconfinement/thermalization
Initial parton density
Initial condition in high-energy nuclear collisions - Color Glass Condensation
Cold-QCD-matter, small-x, high-parton density
- parton structures in nucleon / nucleus
By Richard. Heeks;
Di-leptons are emitted inthe whole volume of the fireball, not from surface
The magnitude of
large p_T is distinguishable for EOS with/out
T_eff~0.4Gev with partonic phase
T_eff~0.3Gev with hadronic phase only
Such behaviors of dileptons are expected to be measured and tested in future experiments
The behavior of Teff and v2 are similar to hadronic signals, no structure to manifest the phase transition
sizeable collective flow is observable.
no flow effect.
For small M, flow effect is dominant.
At small m_T, collective motion --> T_eff
At large m_T, harden the spectra from HG
Scaled by n_binary, without any medium modification;
1)suppress single lepton by melting D-mesons,
2)suppress pairs by switching off dynamics correlation