https://doi.org/10.1140/epjc/s10052-019-7563-0
Regular Article - Theoretical Physics
Mapping collinear in-medium parton splittings
1
Instituto Galego de Física de Altas Enerxías IGFAE, Universidade de Santiago de Compostela, 15782, Galicia, Spain
2
LIP, Av. Prof. Gama Pinto, 2, 1649-003, Lisbon, Portugal
3
Instituto Superior Técnico (IST), Universidade de Lisboa, Av. Rovisco Pais 1, 1049-001, Lisbon, Portugal
4
Department of Physics and Technology, University of Bergen, 5020, Bergen, Norway
* e-mail: konrad.tywoniuk@uib.no
Received:
18
July
2019
Accepted:
14
December
2019
Published online:
7
January
2020
We map the spectrum of 
parton splittings inside a medium characterized by a transport coefficient 
onto the kinematical Lund plane, taking into account the finite formation time of the process. We discuss the distinct regimes arising in this map for in-medium splittings, pointing out the close correspondence to a semi-classical description in the limit of hard, collinear radiation with short formation times. Although we disregard any modifications of the original parton kinematics in course of the propagation through the medium, subtle modifications to the radiation pattern compared to the vacuum baseline can be traced back to the physics of color decoherence and accumulated interactions in the medium. We provide theoretical support to vacuum-like emissions inside the medium by delimiting the regions of phase space where it is dominant, identifying also the relevant time-scales involved. The observed modifications are shown to be quite general for any dipole created in the medium.
© The Author(s), 2020
