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Title: From Hydrodynamics to Jet Quenching, Coalescence, and Hadron Cascade: A Coupled Approach to Solving the $$R_{AA}Ⓧv_{2}$$ Puzzle

Journal Article · · Physical Review Letters
ORCiD logo [1];  [2]; ORCiD logo [3];  [4]; ORCiD logo [5]
  1. China Central Normal Univ., Wuhan (China). Physics Dept.
  2. Univ. of California, Berkeley, CA (United States); Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)
  3. Chinese Academy of Sciences (CAS), Beijing (China)
  4. Universidade de Santiago de Compostela (Spain)
  5. China Central Normal Univ., Wuhan (China). Physics Dept.; Lawrence Berkeley National Lab. (LBNL), Berkeley, CA (United States)

Hydrodynamics and jet quenching are responsible for the elliptic flow $$v_{2}$$ and suppression of large transverse momentum ($$p_{T}$$) hadrons, respectively, two of the most important phenomena leading to the discovery of a strongly coupled quark-gluon plasma in high-energy heavy-ion collisions. A consistent description of the hadron suppression factor $$R_{AA}$$ and $$v_{2}$$, especially at intermediate $$p_{T}$$, however, remains a challenge. We solve this long-standing $$R_{AA}Ⓧv_{2}$$ puzzle by including quark coalescence for hadronization and final state hadron cascade in the coupled linear Boltzmann transport-hydro model that combines concurrent jet transport and hydrodynamic evolution of the bulk medium. We illustrate that quark coalescence and hadron cascade, two keys to solving the puzzle, also lead to a splitting of $$v_{2}$$ for pions, kaons, and protons in the intermediate $$p_{T}$$ region. We demonstrate for the first time that experimental data on $$R_{AA}, v_{2}$$, and their hadron flavor dependence from low to intermediate and high $$p_{T}$$ in high-energy heavy-ion collisions can be understood within this coupled framework.

Research Organization:
Lawrence Berkeley National Laboratory (LBNL), Berkeley, CA (United States)
Sponsoring Organization:
USDOE Office of Science (SC), High Energy Physics (HEP) (SC-25)
Grant/Contract Number:
AC02-05CH11231
OSTI ID:
1855357
Journal Information:
Physical Review Letters, Journal Name: Physical Review Letters Journal Issue: 2 Vol. 128; ISSN 0031-9007
Publisher:
American Physical Society (APS)Copyright Statement
Country of Publication:
United States
Language:
English

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