Nuclear Physics Seminar - Matthew Hoppesch (UIUC) “Probing new scales of path length-dependent energy loss via a dijet balance measurement in light-ion collisions”
- Event Type
- Seminar/Symposium
- Sponsor
- Physics Department
- Location
- Rhondale Tso Seminar Room, Loomis 236
- Date
- Sep 29, 2025 1:00 pm
- Speaker
- Matthew Hoppesch (UIUC)
- Contact
- Brandy Koebbe
- bkoebbe@illinois.edu
- Views
- 13
Light-ion collisions provide a new length scale on which to probe the quark-gluon plasma (QGP), since the transverse extent of the overlapping region is much larger than p+Pb but much smaller than Pb+Pb. The presence of parton energy loss in this system is of particular interest, given that this phenomenon was observed in Pb+Pb but not in p+Pb. ATLAS collected an integrated luminosity of 8 1/nb in O+O collisions in July of 2025. In this talk, I will present a recent ATLAS preliminary measurement of the dijet momentum balance (xJ) at center-of-mass energy 5.36 TeV in O+O collisions. The pair-normalized xJ yields indicate that dijets in central O+O events are slightly more imbalanced than in pp. This result provides unique input into understanding the path length dependence of energy loss in high-pT probes transversing the QGP.