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Title: Quark branching in QCD matter to any order in opacity beyond the soft gluon emission limit

Abstract

Cold nuclear matter effects in reactions with nuclei at a future electron-ion collider (EIC) lead to a modification of semi-inclusive hadron production, jet cross sections, and jet substructure when compared to the vacuum. At leading order in the strong coupling, a jet produced at an EIC is initiated as an energetic quark, and the process of this quark splitting into a quark-gluon system underlies experimental observables. The spectrum of gluons associated with the branching of this quark jet is heavily modified by multiple scattering in a medium, allowing jet cross sections and jet substructure to be used as a probe of the medium’s properties. We present a formalism that allows us to compute the gluon spectrum of a quark jet to an arbitrary order in opacity, the average number of scatterings in the medium. This calculation goes beyond the simplifying limit in which the gluon radiation is soft and can be interpreted as energy loss of the quark, and it significantly extends previous work which computes the full gluon spectrum only to first order in opacity. The theoretical framework demonstrated here applies equally well to light parton and heavy quark branching, and is easily generalizable to all in-medium splitting processes.

Authors:
;
Publication Date:
Research Org.:
Los Alamos National Laboratory (LANL), Los Alamos, NM (United States)
Sponsoring Org.:
USDOE Office of Science (SC), Nuclear Physics (NP)
OSTI Identifier:
1481818
Alternate Identifier(s):
OSTI ID: 1542837
Report Number(s):
LA-UR-18-26751
Journal ID: ISSN 2470-0010; PRVDAQ; 094010
Grant/Contract Number:  
SC0012704; 89233218CNA000001
Resource Type:
Published Article
Journal Name:
Physical Review D
Additional Journal Information:
Journal Name: Physical Review D Journal Volume: 98 Journal Issue: 9; Journal ID: ISSN 2470-0010
Publisher:
American Physical Society
Country of Publication:
United States
Language:
English
Subject:
73 NUCLEAR PHYSICS AND RADIATION PHYSICS

Citation Formats

Sievert, Matthew D., and Vitev, Ivan. Quark branching in QCD matter to any order in opacity beyond the soft gluon emission limit. United States: N. p., 2018. Web. doi:10.1103/PhysRevD.98.094010.
Sievert, Matthew D., & Vitev, Ivan. Quark branching in QCD matter to any order in opacity beyond the soft gluon emission limit. United States. https://doi.org/10.1103/PhysRevD.98.094010
Sievert, Matthew D., and Vitev, Ivan. Mon . "Quark branching in QCD matter to any order in opacity beyond the soft gluon emission limit". United States. https://doi.org/10.1103/PhysRevD.98.094010.
@article{osti_1481818,
title = {Quark branching in QCD matter to any order in opacity beyond the soft gluon emission limit},
author = {Sievert, Matthew D. and Vitev, Ivan},
abstractNote = {Cold nuclear matter effects in reactions with nuclei at a future electron-ion collider (EIC) lead to a modification of semi-inclusive hadron production, jet cross sections, and jet substructure when compared to the vacuum. At leading order in the strong coupling, a jet produced at an EIC is initiated as an energetic quark, and the process of this quark splitting into a quark-gluon system underlies experimental observables. The spectrum of gluons associated with the branching of this quark jet is heavily modified by multiple scattering in a medium, allowing jet cross sections and jet substructure to be used as a probe of the medium’s properties. We present a formalism that allows us to compute the gluon spectrum of a quark jet to an arbitrary order in opacity, the average number of scatterings in the medium. This calculation goes beyond the simplifying limit in which the gluon radiation is soft and can be interpreted as energy loss of the quark, and it significantly extends previous work which computes the full gluon spectrum only to first order in opacity. The theoretical framework demonstrated here applies equally well to light parton and heavy quark branching, and is easily generalizable to all in-medium splitting processes.},
doi = {10.1103/PhysRevD.98.094010},
journal = {Physical Review D},
number = 9,
volume = 98,
place = {United States},
year = {Mon Nov 12 00:00:00 EST 2018},
month = {Mon Nov 12 00:00:00 EST 2018}
}

Journal Article:
Free Publicly Available Full Text
Publisher's Version of Record
https://doi.org/10.1103/PhysRevD.98.094010

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Cited by: 36 works
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