Search for the Elusive Jet-Induced Diffusion Wake in Z/γ-Jets with 2D Jet Tomography in High-Energy Heavy-Ion Collisions

被引：40
作者：
Chen, Wei [1 ]
Yang, Zhong [2 ,3 ]
He, Yayun [2 ,3 ,6 ,7 ]
Ke, Weiyao [4 ,5 ]
Pang, Long-Gang [2 ,3 ]
Wang, Xin-Nian [2 ,3 ,4 ,5 ]
机构：
[1] Univ Chinese Acad Sci, Sch Nucl Sci & Technol, Beijing 100049, Peoples R China
[2] Cent China Normal Univ, Key Lab Quark & Lepton Phys MOE, Wuhan 430079, Peoples R China
[3] Cent China Normal Univ, Inst Particle Phys, Wuhan 430079, Peoples R China
[4] Univ Calif Berkeley, Phys Dept, Berkeley, CA 94720 USA
[5] Lawrence Berkeley Natl Lab, Nucl Sci Div MS 70R0319, Berkeley, CA 94720 USA
[6] South China Normal Univ, Southern Nucl Sci Comp Ctr, Guangdong Prov Key Lab Nucl Sci, Inst Quantum Matter, Guangzhou 510006, Peoples R China
[7] South China Normal Univ, Southern Nucl Sci Comp Ctr, Guangdong Hong Kong Joint Lab Quantum Matter, Guangzhou 510006, Peoples R China
来源：
PHYSICAL REVIEW LETTERS | 2021年 / 127卷 / 08期
关键词：
MULTIPLE PARTON SCATTERING; NUCLEI; MODEL; PLUS; LHC;
D O I：
10.1103/PhysRevLett.127.082301
中图分类号：
O4 [物理学];
学科分类号：
0702 ;
摘要：
Diffusion wake is an unambiguous part of the jet-induced medium response in high-energy heavy-ion collisions that leads to a depletion of soft hadrons in the opposite direction of the jet propagation. New experimental data on Z-hadron correlation in Pb + Pb collisions at the Large Hadron Collider show, however, an enhancement of soft hadrons in the direction of both the Z and the jet. Using a coupled linear Boltzmann transport and hydro model, we demonstrate that medium modification of partons from the initial multiple parton interaction (MPI) gives rise to a soft hadron enhancement that is uniform in azimuthal angle while jet-induced medium response and soft gluon radiation dominate the enhancement in the jet direction. After subtraction of the contributions from MPI with a mixed-event procedure, the diffusion wake becomes visible in the near-side Z-hadron correlation. We further employ the longitudinal and transverse gradient jet tomography for the first time to localize the initial jet production positions in Z/gamma-jet events in which the effect of the diffusion wake is apparent in Z/gamma-hadron correlation even without the subtraction of the MPI contribution.
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页数：6
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