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Heavy-ion collisions at the LHC generate the hottest form of matter that can be created in a lab - 100 thousand times hotter than the centre of the sun - where hadronic matter exists in a deconfined state of quarks and gluons, the ‘Quark-Gluon Plasma’ (QGP). Jets - collimated sprays of hadrons originating from a high-momentum quark or gluon - are generated in heavy-ion collisions, and their interactions with the QGP provide unique probes of its properties. A key question in the study of the QGP is whether its short-distance structure can be resolved and studied, and a ‘scattering experiment’ involving jets, analogous to Rutherford’s experiment which determined the structure of the atom, offers one of the most promising ways to achieve this. Such effects are expected to be most prominent at low jet transverse momentum ($p_\mathrm{T}$), which is where jet measurements are also sensitive to wake effects due to response of the QGP itself to the jet-medium energy transfer. Measurements that are differential in jet $p_\mathrm{T}$, jet radius $R$, and acoplanarity (deflection angle) may be able to disentangle these various mechanisms.
This talk presents a new measurement of charged-particle jets recoiling from a trigger hadron in proton-proton and central lead-lead collisions by ALICE - the LHC experiment dedicated to studying heavy-ion collisions. The measurement is performed using a background-subtraction technique which provides a precise data-driven subtraction of the large uncorrelated background contaminating the measurement, uniquely enabling the measurement of jet production and acoplanarity over a wide phase space, including the low jet $p_\mathrm{T}$ region for large $R$.
Zoom meeting.
Topic: HEP Seminar
Time: Mar 15, 2024 12:00 PM London
https://liverpool-ac-uk.zoom.us/j/98614428303?pwd=RUtpcHhwL3VjQVBPeHNrNFVBSXRodz09
Meeting ID: 986 1442 8303
Passcode: x3.rM*#*
Paolo Beltrame