Speaker
Description
Jets are formed in the initial hard scattering of a collision and thus experience multiple scales of QCD processes. In proton-proton collisions, we may study how colored partons radiate and fragment using differential jet substructure, made possible by the ALICE detector’s low-momentum reach and high-precision tracking. More specifically, by de-clustering the jet fragmentation history splitting-by-splitting, we seek to access the earliest stages of jet evolution.
This de-clustering is commonly performed using the Cambridge-Aachen (C/A) algorithm, which invokes angular-ordering of QCD emissions to arrange the splittings from widest to narrowest. In this work, we instead present results of groomed jet substructure for jets de-clustered using the τ algorithm, which orders splittings based on the formation time (τ_form). In comparing these two algorithms in the vacuum conditions of pp collisions, we find differences that highlight sensitivity to the underlying ordering variable and are important for extending MC generators to higher orders.
These results also establish a baseline in pp collisions and motivate future applications in Pb-Pb collisions at 5.36 TeV, where the medium-induced emissions may not respect angular-ordering, and where an ordering on formation time may help tune the degree of quenching. Reliably de-clustering jets in Pb-Pb collisions will allow for investigation into modifications to jet substructure made by the medium.
| Is this an experimental talk? | Yes |
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| Is this on behalf of a collaboration? | Yes |
| Which collaboration? | ALICE Collaboration |
| Are you willing to present as a poster if it is not selected for oral presentation? | Yes |