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Title: Searching for QGP droplets with high- p T hadrons and heavy flavor

Journal Article · · Physical Review. C

The search for the smallest quark-gluon plasma (QGP) droplets in nature has motivated recent small collisions system programs at the BNL Relativistic Heavy Ion Collider (RHIC) and the CERN Large Hadron Collider (LHC). Unambiguous identification of jet quenching due to final-state interactions is key to confirming quarkgluon plasma (QGP) formation in these reactions. We compute the nuclear modification factors RAA and Rp(d)A of charged hadrons and heavy flavor mesons in large (Au-Au, Xe-Xe, Pb-Pb) and small (d-Au, p-Pb, O-O) colliding systems, respectively. Our results include the Cronin effect and initial-state parton energy loss in cold nuclear matter. In the final state, hard partons undergo collisional energy loss and branching that was recently derived using soft-collinear-effective-theory with Glauber gluons (SCETG). In large colliding systems, mediummodified quantum chromodynamics evolution of the fragmentation functions dominates the nuclear correction. As the system size decreases, we find that cold nuclear matter effects, collisional energy loss, and QGP-induced radiations can become equally important. A systematic scan over the medium size and mass or flavor dependence of RAA provides the opportunity to separate these individual contributions and identify QGP signatures in small systems. Predictions for $$R^h_{AA}$$, $$R^D_{AA}$$, $$R^B_{AA}$$ in O-O collisions at √s = 0.2 and 7 TeV are presented with and without the formation of a QGP and contrasted with the corresponding Rp(d)A calculations. Single-hadron measurements at RHIC and the LHC will not only test the O-O predictions for both light and heavy flavor production but also shed light on the possibly very different dynamics of p-A and A-A reactions at similar soft particle production multiplicities.

Research Organization:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Organization:
USDOE Laboratory Directed Research and Development (LDRD) Program
Grant/Contract Number:
89233218CNA000001; 20210914PRD2
OSTI ID:
1983676
Alternate ID(s):
OSTI ID: 1996163
Report Number(s):
LA-UR-22-23062; PRVCAN; 064903
Journal Information:
Physical Review. C, Journal Name: Physical Review. C Vol. 107 Journal Issue: 6; ISSN 2469-9985
Publisher:
American Physical SocietyCopyright Statement
Country of Publication:
United States
Language:
English

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  • Tachibana, Yasuki
  • Proceedings of International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions — PoS(HardProbes2018) https://doi.org/10.22323/1.345.0099
conference April 2019
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