12-15 April 2016
BNL Physics Building
US/Eastern timezone

What have we learned from high pT?

15 Apr 2016, 11:00
Large Seminar Room (BNL Physics Building)

Large Seminar Room

BNL Physics Building


Prof. Barbara Jacak (Lawrence Berkeley National Laboratory)


I will summarize what we have learned from measurements at high pT, and discuss some open questions. Simple observables such as single hadron RAA already proved very interesting, showing a large energy loss in the plasma and an unexpectedly flat shape with pT. Measurements have now reached sufficient precision to allow conclusions about the fractional energy shift and extraction of medium transport parameters. The quark mass dependence of RAA allows us to quantify the role of collisional energy loss. There have recently been tremendous strides in measuring medium modification of the jet fragmentation function. There is clear experimental evidence for emission of low z fragments at large angles, though there remain differences between LHC and RHIC that must be better understood. Nevertheless, the data have inspired new theoretical treatment of parton branchings and the resulting in-medium cascades. The physics of energy transport in hot plasma and cold nuclear matter is clearly related, and better understanding of parton-plasma interactions can provide insights into the mechanism for thermalization in the early stage of a heavy ion collision.

Primary author

Prof. Barbara Jacak (Lawrence Berkeley National Laboratory)

Presentation Materials