Jet-hadron correlations measured relative to the second order event plane in Pb-Pb collisions at $\sqrt{s_{\rm{NN}}}$ = 2.76 TeV
- Acharya, Shreyasi et al
- arXiv:1910.14398CERN-EP-2019-244
 | Jet-hadron correlations are measured for jets in three regions relative to the $n = 2$ event plane, which is transverse to the direction of the beams. These regions include in-plane ($| \psi-\phi_{\mathrm {jet}}|<\pi/6$) shown in red, mid-plane ($\pi/6<|\psi-\phi_{\mathrm {jet}}|<\pi/3$) shown in white, and out-of-plane ($|\psi-\phi_{\mathrm {jet}}|>\pi/3$) shown in blue. |
 | The generator level jet probability distribution corresponding to jets measured with \pt between 20-40 \GeV for PYTHIA events embedded in 30--50\% central \PbPb collisions. Generator level jets are required to have $\pt>5$ \GeV. The distribution is measured for each angle relative to the event plane, as well as the sum of all angles. |
 | The signal plus background region, $|\Delta\eta|<0.6$ (green points), the region which is background-dominated on the \ns, $0.8<|\Delta\eta|<1.2$ (black points), and the RPF fit to $|\Delta\phi|<\pi/2$ (blue band) to the region which is background-dominated on the \ns for \pttrigrange{20}{40} jets correlated with \ptassocrange{1.5}{2.0} hadrons from 30-50\% centrality collisions on the top panel. The middle panel shows the quality of the RPF fit to the region which is background-dominated on the \ns, (data$-$fit)/fit. On the bottom panel are the RPF corrected correlation functions, with the uncertainty from the background fit (red band), and the correlated uncertainty (green band). |
 | The (a) near-side and (b) away-side yield vs \ptassoc for \pttrigrange{20}{40} full jets of 30-50\% centrality in \PbPb collisions. The wider band corresponds to the background uncertainty, which is non-trivially correlated point-to-point~\cite{Sharma:2015qra,Nattrass:2016cln}. The narrower bands are the systematic uncertainties coming from the shape uncertainty of the acceptance correction. There is an additional 5\% global scale uncertainty. Points are displaced for visibility. |
 | The (a) near-side and (b) away-side yield differences vs \ptassoc for \pttrigrange{20}{40} full jets of 30-50\% centrality in \PbPb collisions. The narrower band corresponds to the background uncertainty, which is non-trivially correlated point-to-point~\cite{Sharma:2015qra,Nattrass:2016cln}. The wider bands are the systematic uncertainties coming from the shape uncertainty of the acceptance correction. There is an additional 5\% global scale uncertainty. Points are displaced for visibility. Data are compared to calculations from JEWEL~\cite{Zapp:2013vla} with and without recoil particles. |
 | The (a) near-side and (b) away-side yield ratios vs \ptassoc for \pttrigrange{20}{40} full jets of 30-50\% centrality in \PbPb collisions. The bands correspond to the background uncertainty, which is non-trivially correlated point-to-point~\cite{Sharma:2015qra,Nattrass:2016cln}. The systematic uncertainties coming from the shape uncertainty of the acceptance correction cancel out for the ratios. Points are displaced for visibility. Data are compared to calculations from JEWEL~\cite{Zapp:2013vla} with and without recoil particles. |
 | The (a) near-side and (b) away-side widths vs \ptassoc for \pttrigrange{20}{40} full jets of 30-50\% centrality in \PbPb collisions. The wider band corresponds the background uncertainty, which is non-trivially correlated point-to-point~\cite{Sharma:2015qra,Nattrass:2016cln}. The narrower bands are the systematic uncertainties coming from the shape uncertainty of the acceptance correction. Points are displaced for visibility. |