A4 Article in conference proceedings
Event-by-event picture for the medium-induced jet evolution (2017)

Escobedo Espinosa, M., & Iancu, E. (2017). Event-by-event picture for the medium-induced jet evolution. In Y. Foka, N. Brambilla, & V. Kovalenko (Eds.), XIIth Quark Confinement and the Hadron Spectrum - Proceedings (Article 07006). EDP Sciences. EPJ Web of Conferences, 137. https://doi.org/10.1051/epjconf/201713707006

JYU authors or editors

Escobedo Espinosa, Miguel

Publication details

All authors or editors: Escobedo Espinosa, Miguel; Iancu, Edmond

Parent publication: XIIth Quark Confinement and the Hadron Spectrum - Proceedings

Parent publication editors: Foka, Y.; Brambilla, N.; Kovalenko, V.

Journal or series: EPJ Web of Conferences

ISSN: 2101-6275

eISSN: 2100-014X

Publication year: 2017

Number in series: 137

Article number: 07006

Publisher: EDP Sciences

Publication country: France

Publication language: English

DOI: https://doi.org/10.1051/epjconf/201713707006

Publication open access: Openly available

Publication channel open access: Open Access channel

Publication is parallel published (JYX): https://jyx.jyu.fi/handle/123456789/53736

Additional information: XIIth Quark Confinement and the Hadron Spectrum. Thessaloniki, Greece, August 29 – September 3, 2016.

Abstract

We discuss the evolution of an energetic jet which propagates through a dense quark-gluon plasma and radiates gluons due to its interactions with the medium. Within perturbative QCD, this evolution can be described as a stochastic branching process, that we have managed to solve exactly. We present exact, analytic, results for the gluon spectrum (the average gluon distribution) and for the higher n-point functions, which describe correlations and fluctuations. Using these results, we construct the event-by-event picture of the gluon distribution produced via medium-induced gluon branching. In contrast to what happens in a usual QCD cascade in vacuum, the medium-induced branchings are quasi-democratic, with offspring gluons carrying sizable fractions of the energy of their parent parton. We find large fluctuations in the energy loss and in the multiplicity of soft gluons. The multiplicity distribution is predicted to exhibit KNO (Koba-Nielsen-Olesen) scaling. These predictions can be tested in Pb+Pb collisions at the LHC, via event-by-event measurements of the di-jet asymmetry.

Free keywords: quantum chromodynamics; jet evolution; gluon distribution

Fields of science: