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Title
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Jet quenching parameter in an expanding QCD plasma
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Author
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Abstract
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| We study the phenomenon of transverse momentum broadening for a high-p(T) parton propagating through a weakly-coupled quark-gluon plasma undergoing boost-invariant longitudinal expansion. We propose a boost-invariant description for this phenomenon, in which the broadening refers to the angular variables.(the pseudo-rapidity) and phi(the azimuthal angle). The jet quenching parameter (q) over cap which enters this description depends upon the proper time alone. We furthermore consider radiative corrections to (q) over cap As in the case of a static medium, we find potentially large corrections enhanced by a double logarithm. But unlike for the static medium, these corrections are now local in time: they depend upon the local (proper) time characterizing the expansion, and not upon the overall path length. We resum such corrections to all orders into a renormalized jet quenching parameter. The main effect of this resummation is to slow down the decrease of (q) over cap with increasing proper time. (C) 2018 The Authors. Published by Elsevier B.V. |
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Language
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English
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Source (journal)
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Physics letters : B. - Amsterdam, 1967, currens
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Publication
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Amsterdam
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North-Holland
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2018
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ISSN
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0370-2693
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DOI
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10.1016/J.PHYSLETB.2018.10.007
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Volume/pages
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786
(2018)
, p. 288-295
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ISI
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000452318400037
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Full text (Publisher's DOI)
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Full text (open access)
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