Jets, Bulk Matter, and their Interaction in Heavy Ion Collisions at Several TeV - INSPIRE

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Jets, Bulk Matter, and their Interaction in Heavy Ion Collisions at Several TeV

K. Werner
(
- SUBATECH, Nantes
)
,
Iu. Karpenko
(
- BITP, Kiev
)
,
M. Bleicher
(
- Frankfurt U., FIAS
)
,
T. Pierog
(
- KIT, Karlsruhe
)
,
S. Porteboeuf-Houssais
(
- Clermont-Ferrand U.
)

Mar, 2012

16 pages

Published in:

Phys.Rev.C 85 (2012) 064907

e-Print:

1203.5704 [nucl-th]

DOI:

10.1103/PhysRevC.85.064907

View in:

reference search171 citations

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Abstract: (arXiv)

We discuss a theoretical scheme that accounts for bulk matter, jets, and the interaction between the two. The aim is a complete description of particle production at all transverse momentum (

p_{t}

) scales. In this picture, the hard initial scatterings result in mainly longitudinal flux tubes, with transversely moving pieces carrying the

p_{t}

of the partons from hard scatterings. These flux tubes constitute eventually both bulk matter (which thermalizes and flows) and jets. We introduce a criterion based on parton energy loss to decide whether a given string segment contributes to the bulk or leaves the matter to end up as a jet of hadrons. Essentially low

p_{t}

segments from inside the volume will constitute the bulk, high

p_{t}

segments (or segments very close to the surface) contribute to the jets. The latter ones appear after the usual flux tube breaking via q-qbar production (Schwinger mechanism). Interesting is the transition region: Intermediate

p_{t}

segments produced inside the matter close to the surface but having enough energy to escape, are supposed to pick up q-qbar pairs from the thermal matter rather than creating them via the Schwinger mechanism. This represents a communication between jets and the flowing bulk matter (fluid-jet interaction). Also very important is the interaction between jet hadrons and the soft hadrons from the fluid freeze-out. We employ the new picture to investigate Pb-Pb collisions at 2.76 TeV. We discuss the centrality and

p_{t}

dependence of particle production and long range dihadron correlations at small and large

p_{t}

.

25.75.-q
heavy ion: scattering
jet: production
matter: interaction
flux tube
parton: energy loss
fluid
multiple scattering
transverse momentum: momentum spectrum
hadron: production

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