BOOST 2024 - 16th International Workshop on Boosted Object Phenomenology, Reconstruction, Measurements, and Searches at Colliders

Studies of the jet axis decorrelation with photon-jet events in PbPb and pp collisions at sNN = 5.02 TeV

1 Aug 2024, 09:40

20m

Palazzo Ducale (Genova, Italy)

Talk Heavy Ions Heavy Ions

Speaker

Molly Park (Massachusetts Inst. of Technology (US))

Description

search for medium-induced jet transverse momentum broadening is performed with isolated photon-tagged jet events in proton-proton (pp) and lead-lead (PbPb) collisions at nucleon-nucleon center-of-mass energy $\text{Undefined control sequence TeV}$. The difference between jet axes as determined via energy-weight and winner-take-all clustering schemes, also known as the decorrelation of jet axes and denoted $\mathrm{\Delta }j$, is measured for the first time in photon-tagged jet events. The pp and PbPb data samples were recorded with the CMS detector at the LHC and correspond to integrated luminosities of 1.69 nb${}^{-1}$ and 302 pb${}^{-1}$ respectively. Events are required to have a leading isolated photon with $\text{Undefined control sequence GeVc}$, which are correlated with anti-\kt $R=0.3$ jets with $\text{Undefined control sequence GeVc}$ opposite in azimuthal angle. The PbPb results are reported as a function of collision centrality and compared to pp reference data. Jets with $\text{Undefined control sequence GeVc}$ have consistent shape in PbPb relative to pp. However, jets with $\text{Undefined control sequence GeVc}$ in central PbPb show signs of narrowing relative to pp. The results are compared to the \jewel and \pyquen theoretical models, which include different methods of energy loss.

Presentation materials

BOOST2024-Molly-Park.pdf