https://doi.org/10.1140/epjc/s10052-023-12044-2
Regular Article - Theoretical Physics
Gluon radiation from a classical point particle: recoil effects
1
Institute for Nuclear Theory, University of Washington, Box 351550, 98195, Seattle, WA, USA
2
Instituto Galego de Fisica de Altas Enerxias (IGFAE), Universidade de Santiago de Compostela, Rúa de Xoaquín Díaz de Rábago, 15705, Santiago de Compostela, Galicia, Spain
3
School of Physics, University of the Witwatersrand, 1 Jan Smuts Avenue, 2000, Johannesburg, South Africa
4
Department of Physics, University of Cape Town, University Avenue, 7701, Cape Town, South Africa
Received:
7
July
2023
Accepted:
14
September
2023
Published online:
3
October
2023
The gluon radiation spectrum of a classical particle struck by a sheet of colored glass, is a key ingredient in understanding the distribution of energy and baryon density in the fragmentation region, particularly in the initial stages of heavy ion collisions. However, the currently known classical spectrum has a troublesome high-momentum tail (Kajantie et al. in Phys. Rev. D 100(5):054011, 2019; Phys Rev D 101(5):054012, 2020). By comparing tree-level bremsstrahlung of a spin-less quark to the above-mentioned known result, we propose an interpolating formula that takes into account the recoil of the struck particle, and therefore produces the correct perturbative behaviour at high momentum of the radiated gluon.
© The Author(s) 2023
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