Speaker
Takao Sakaguchi
(BNL)
Description
High $p_{T}$ hadrons as fragments of hard scattered patrons
are a powerful tool to probe the opacity of the system
produced in nucleus collisions, through the loss of their
momenta in the medium created. In the last decade, the
momentum loss was quantified in terms of suppression of
the yield at given $p_T$. We recently measured the
fractional momentum loss ($\delta p_{T}/p_{T}$, where
$p_T$ being original momentum of a hadron, and
$\delta p_T$ being the loss of its momentum in the medium)
of the hadrons statistically, and found that the partons
lose 1.5 times larger $\delta p_{T}/p_{T}$ in central
2.76TeV Pb+Pb collisions at the LHC than that in 200GeV Au+Au
collisions at RHIC. We are extending the $\delta p_{T}/p_{T}$
measurement over different collisions species and cms energies
to study a systematic trend.
It is also interesting to see how the trend connects to the
smaller systems like $d(p)$+A collisions which recently have
revealed their possible collective nature. The measurement of
emission angle dependent momentum loss of hadrons would also be
interesting in the systems.
We will report a detail investigation of parton energy loss in
$d(p)$+A and A+A systems using high $p_T$ hadrons.
| On behalf of collaboration: | PHENIX |
|---|
Author
Takao Sakaguchi
(BNL)
