Jet path length dependence in Pb + Pb Collisions with the ATLAS detector

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• 作者：Helena Santos ; on behalf of the ATLAS collaboration
• 关键词：Heavy Ions ; Elliptic flow ; Dijets ; Multijets
• 刊名：Nuclear and Particle Physics Proceedings
• 出版年：2016
• 出版时间：July-September 2016
• 年：2016
• 卷：276-278
• 期：Complete
• 页码：205-208
• 全文大小：302 K

文摘

The phenomenon of events containing highly asymmetric dijet pairs is one of the most striking results in heavy ion physics. It has provided the first direct observation of in-medium jet energy loss at the LHC. New results showing the variation of the dijet asymmetry with the angle between the leading jet and the second order Event Plane are presented. This observable effectively probes the path-length dependence of the dijet asymmetry at fixed centrality and can provide a better understanding of the correlation of the parton energy-loss with the underlying geometry. Correlated production of nearby jets is also shown. Two neighbouring jets originating from the same hard scattering should have more similar path lengths in the medium compared to the two jets in the dijet event topology, therefore measuring neighbouring jets may probe differences in quenching that do not result from different path length. The production of nearby jets is quantified using the rate, R_ΔR$R_{\mathrm{\Delta }R}$, of “neighbouring” jets that accompany “test” jets. The centrality dependence of R_ΔR$R_{\mathrm{\Delta }R}$ as well as the ratios of the R_ΔR$R_{\mathrm{\Delta }R}$ values in collisions of different centrality and the values in the 40–80% centrality range are presented.