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Testing the Reliability of the Soft-Gluon Approximation for High p Particles

1
Institute of Physics Belgrade, University of Belgrade, 11 000 Belgrade, Serbia
2
Faculty of Biology, Institute of Physiology and Biochemistry, University of Belgrade, 11 000 Belgrade, Serbia
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Author to whom correspondence should be addressed.
Presented at Hot Quarks 2018—Workshop for Young Scientists on the Physics of Ultrarelativistic Nucleus-Nucleus Collisions, Texel, The Netherlands, 7–14 September 2018.
Proceedings 2019, 10(1), 13; https://doi.org/10.3390/proceedings2019010013
Published: 11 April 2019
The soft-gluon approximation assumes that a high p parton propagating through dense QCD matter loses only a small amount of its energy via gluon radiation. This assumption is made in many different jet quenching approaches, which nevertheless predicted a sizable radiative energy loss of such particles. This questions the reliability of this approximation, which must then be reconsidered. To address this issue, we relaxed the soft-gluon approximation within the DGLV formalism to the first order in opacity. The obtained analytical expressions are notably different from the soft-gluon case. Surprisingly the numerical effects that stem from waiving this assumption on fractional radiative energy loss and number of radiated gluons are small. Additionally, the effect on suppression is negligible, which can be intuitively understood by the cancellation of the opposite effects on the above mentioned variables. Consequently, our results surprisingly indicate that, contrary to the doubts mentioned above, the soft-gluon approximation remains well-founded within the DGLV formalism. We also investigate the effects of this assumption in the case of a dynamical medium, which suggests generality of the conclusions presented here.
Keywords: beyond soft-gluon approximation; radiative energy loss; high p⊥ particles; suppression beyond soft-gluon approximation; radiative energy loss; high p⊥ particles; suppression
MDPI and ACS Style

Blagojevic, B.; Djordjevic, M.; Djordjevic, M. Testing the Reliability of the Soft-Gluon Approximation for High p Particles . Proceedings 2019, 10, 13.

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