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. Since the last decade, the momentum loss has been 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 measurement of $\delta p_T/p_T$ over to different collision species and cms energies and investigating a systematic trend. We recently found that the $\delta p_T/p_T$ nicely scales with $dN/d\eta$. We will report the latest investigation of parton energy loss in A+A collisions using high $p_T$ hadrons.
Author
Takao Sakaguchi
(BNL)
