Conveners
Parallel 21: jets in small systems
- Gunther Roland (Massachusetts Inst. of Technology (US))
Collective effects like elliptic and triangular flow have been observed in small system collisions and found to be consistent with the formation of quark-gluon plasma (QGP) droplets. Corresponding changes in the nuclear modification factor, $R_{xA}$ however, became controversial, because they depend on certain model assumptions when mapping event activity on collision geometry. Using direct...
Measurements of jets recoiling from a trigger hadron are useful probes of jet quenching, where jets are modified in the presence of a QGP. In particular, the spectrum of jets as a function of the separation angle $\Delta\phi$ is a good indicator of jet quenching effects such as azimuthal broadening. In this talk, we present measurements of this hadron-jet observable in high multiplicity (HM)...
Experimental exploration of small systems has produced several observables that indicate the existence of non-negligible correlations between hard and soft dynamics. When studying heavy ion collisions, the initial conditions and early stages of the bulk evolution are assumed independent of the dynamics of jets and high-$p_T$ partons. For such large systems, the production of rare high-$p_T$...
