Speaker
Description
We present the first theoretical investigation of Fox-Wolfram moments (FWMs) for multi-jet productions in relativistic heavy ion collisions. In this work jet productions in p+p collisions are computed with a Monte Carlo event generator SHERPA, while the Linear Boltzmann Transport model is utilized to simulate the multiple scattering of energetic partons in the hot and desne QCD matter. The event-normalized distributions of the lower-order FWM, $H_1^T$ in p+p and Pb+Pb collisions are calculated. It is found that for events with jet number $n_\text{jet} = 2$ the $H_1^T$ distribution in Pb+Pb is suppressed at small $H_1^T$ while enhanced at large $H_1^T$ region as compared to p+p. For events with $n_\text{jet}>2$, the jet number reduction effect due to jet quenching in the QGP decreases the the $H_1^T$ distriubtion at large $H_1^T$ in Pb+Pb relative to p+p. Analyses indicate that medium modifications bring the two jets in two harder pairwise events closer together, while the softest jets in the pairwise events move further apart. These combined effects then contribute to the modification of the event shape with $n_\text{jet} > 2$ in Pb+Pb reaction.
| Category | Theory |
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