QCD pressure: Renormalization group optimized perturbation theory confronts lattice

Autor: Tulio E. Restrepo, Marcus Benghi Pinto, Jean-Loïc Kneur
Přispěvatelé: Laboratoire Charles Coulomb (L2C), Université de Montpellier (UM)-Centre National de la Recherche Scientifique (CNRS), Departamento de Física [Universidade Federal de Santa Catarina], Universidade Federal de Santa Catarina = Federal University of Santa Catarina [Florianópolis] (UFSC)
Jazyk: angličtina
Rok vydání: 2021
Předmět:
High Energy Physics - Theory
hard thermal loop approximation
Nuclear Theory
[PHYS.NUCL]Physics [physics]/Nuclear Theory [nucl-th]
High Energy Physics::Lattice
Lattice (group)
FOS: Physical sciences
01 natural sciences
Computer Science::Digital Libraries
thermal
Nuclear Theory (nucl-th)
quark
pressure
High Energy Physics - Lattice
High Energy Physics - Phenomenology (hep-ph)
0103 physical sciences
Resummation
quantum chromodynamics: perturbation theory
010306 general physics
temperature dependence
Mathematical physics
lattice
Quantum chromodynamics
Physics
010308 nuclear & particles physics
[PHYS.HTHE]Physics [physics]/High Energy Physics - Theory [hep-th]
High Energy Physics - Lattice (hep-lat)
High Energy Physics::Phenomenology
higher-order: 1
Order (ring theory)
Perturbative QCD
gluon
Renormalization group
16. Peace & justice
Gluon
critical phenomena: temperature
High Energy Physics - Phenomenology
High Energy Physics - Theory (hep-th)
resummation
scale dependence
[PHYS.HPHE]Physics [physics]/High Energy Physics - Phenomenology [hep-ph]
High Energy Physics::Experiment
Perturbation theory (quantum mechanics)
renormalization group
Zdroj: Physical Review D
Physical Review D, American Physical Society, 2021, 104 (3), pp.L031502. ⟨10.1103/PhysRevD.104.L031502⟩
Physical Review
ISSN: 1550-7998
1550-2368
DOI: 10.1103/PhysRevD.104.L031502⟩
Popis: The quark contribution to the QCD pressure, $P_q$, is evaluated up to next-to-leading order (NLO) within the renormalization group optimized perturbation theory (RGOPT) resummation approach. To evaluate the complete QCD pressure we simply add the perturbative NLO contribution from massless gluons to the resummed $P_q$. Despite of this unsophisticated approximation our results for $P = P_q +P_g$ at the central scale $M\sim 2\pi T$ show a remarkable agreement with ab initio lattice predictions for $0.25 \lesssim T \lesssim 1 \, {\rm GeV}$. We also show that by being imbued with RG properties, the RGOPT produces a drastic reduction of the embarrassing remnant scale dependence that plagues both standard thermal perturbative QCD and hard thermal loop perturbation theory (HTLpt) applications.
Comment: 6 pages and 3 figures. Further clarifications. To appear in Phys. Rev. D
Databáze: OpenAIRE
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