Dijet imbalance measurements in Au plus Au and pp collisions at root s(NN)=200 GeV at STAR

0477478 - ÚJF 2018 RIV US eng J - Journal Article
Adamczyk, L. - Adkins, J. K. - Agakishiev, G. - Bielčík, J. - Bielčíková, Jana - Chaloupka, P. - Federič, Pavol - Rusňák, Jan - Rusňáková, O. - Šimko, Miroslav - Šumbera, Michal - Vértési, Robert … Total 340 authors
Dijet imbalance measurements in Au plus Au and pp collisions at root s(NN)=200 GeV at STAR.
Physical Review Letters. Roč. 119, č. 6 (2017), č. článku 062301. ISSN 0031-9007. E-ISSN 1079-7114
R&D Projects: GA MŠMT LG15001; GA MŠMT LM2015054
Institutional support: RVO:61389005
Keywords : STAR collaboration * quark gluon plasma * momentum dependece
OECD category: Nuclear physics
Impact factor: 8.839, year: 2017

We report the first dijet transverse momentum asymmetry measurements from Au + Au and pp collisions at RHIC. The two highest-energy back-to-back jets reconstructed from fragments with transverse momenta above 2 GeV/c display a significantly higher momentum imbalance in heavy-ion collisions than in the pp reference. When reexamined with correlated soft particles included, we observe that these dijets then exhibit a unique new feature-momentum balance is restored to that observed in pp for a jet resolution parameter of R = 0.4, while rebalancing is not attained with a smaller value of R = 0.2.
Permanent Link: http://hdl.handle.net/11104/0273826