Calculating the Jet Quenching Parameter from AdS/CFT

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dc.creatorLiu, Hong
dc.creatorRajagopal, Krishna
dc.creatorWiedemann, Urs Achim
dc.date2006-05-15
dc.date2006-10-09
dc.date.accessioned2026-07-07T10:41:36Z
dc.date.available2026-07-07T10:41:36Z
dc.descriptionModels of medium-induced radiative parton energy loss account for the strong suppression of high-pT hadron spectra in $\sqrt{s_{NN}}=200$ GeV Au-Au collisions at RHIC in terms of a single "jet quenching parameter'' $\hat q$. The available suite of jet quenching measurements make $\hat q$ one of the experimentally best constrained properties of the hot fluid produced in RHIC collisions. We observe that $\hat q$ can be given a model-independent, nonperturbative, quantum field theoretic definition in terms of the short-distance behavior of a particular light-like Wilson loop. We then use the AdS/CFT correspondence to obtain a strong-coupling calculation of $\hat q$ in hot N=4 supersymmetric QCD, finding $\hat{q}_{SYM} = 26.69 \sqrt{α_{SYM} N_c} T^3$ in the limit in which both $N_c$ and $4πα_{SYM} N_c$ are large. We thus learn that at strong coupling $\hat q$ is not proportional to the entropy density $s$, or to some "number density of scatterers'' since, unlike the number of degrees of freedom, $\hat q$ does not grow like $N_c^2$.
dc.descriptionVersion accepted for publication in Phys. Rev. Lett.; factor of Sqrt[2] error corrected, improving agreement between $\hat q$ in N=4 SYM and that extracted from RHIC data
dc.identifierhttps://arxiv.org/abs/hep-ph/0605178
dc.identifierhttp://arxiv.org/abs/hep-ph/0605178
dc.identifierPhys.Rev.Lett.97:182301,2006
dc.identifierdoi:10.1103/PhysRevLett.97.182301
dc.identifier.urihttp://salesiana.dossiersoluciones.com/handle/123456789/181670
dc.subjectHigh Energy Physics - Phenomenology
dc.subjectHigh Energy Physics - Theory
dc.subjectNuclear Theory
dc.titleCalculating the Jet Quenching Parameter from AdS/CFT
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