Suppressedπ0Production at Large Transverse Momentum in CentralAu+AuCollisions at

S. S. Adler¹,

S. Afanasiev²,

C. Aidala³

et al.

Abstract

Transverse momentum spectra of neutral pions in the range 1<p(T)<10 GeV/c have been measured at midrapidity by the PHENIX experiment at BNL RHIC in Au+Au collisions at sqrt[s(NN)]=200 GeV. The pi(0) multiplicity in central reactions is significantly below the yields measured at the same sqrt[s(NN)] in peripheral Au+Au and p+p reactions scaled by the number of nucleon-nucleon collisions. For the most central bin, the suppression factor is approximately 2.5 at p(T)=2 GeV/c and increases to approximately 4-5 at p(T) approximately 4 GeV/c. At larger p(T), the suppression remains constant within errors. The deficit is already apparent in semiperipheral reactions and increases smoothly with centrality.

Radiative energy loss and radiative p ⊥-broadening of high-energy partons in QCD matter

“…Jet quenching is an important signal of the production of dense QCD matter in the ultrarelativistic heavy-ion collisions at RHIC [1,2] and LHC [3][4][5]. Parton energy loss in QCD matter is believed to be responsible for such a suppression of the yields of large p ⊥ hadrons and jets with respect to p + p collisions (see [6] for a recent review).…”

System size and energy dependence of near-side dihadron correlations

“…Jet quenching [1] was first observed as the suppression of inclusive hadron spectra at large transverse momenta (p T ) in central Au+Au collisions with respect to p+p data scaled by number of binary nucleon-nucleon collisions [2][3][4][5][6][7]. Properties of jets at RHIC have been studied extensively using dihadron correlations relative to a trigger particle with large transverse momentum [8][9][10][11][12][13][14].…”

Overall momentum balance and redistribution of the lost energy in asymmetric dijet events in 2.76A TeV Pb-Pb collisions with a multiphase transport model

“…It originates from the energy loss experienced by the hard partonic jets initially produced from early scatterings as they traverse and interact with the highly excited nuclear matter created in these energetic collisions. The picture of parton energy loss and jet quenching has been confirmed by a wealth of experimental results observed at the Relativistic Heavy-Ion Collider (RHIC) and the Large Hadron Collider (LHC), such as the suppression of large transverse momentum hadron production [3][4][5][6][7], and the strong modification of dihadron and photon-hadron transverse momenta and azimuthal angle correlations [8][9][10][11], in central nucleus-nucleus collisions as compared to elementary nucleon-nucleon collisions. Various theoretical and phenomenological models have been developed to explain these jet modification phenomena [12][13][14][15][16][17][18][19][20][21][22][23][24][25][26], and the comparisons of theories to experimental data have shown that jet energy loss is due to the combined effects of elastic and inelastic interactions between the propagating hard partons and the constituents of the hot and dense QGP matter.…”