Beautiful and Charming Energy Correlators
Understanding the detailed structure of energy flow within jets, a field known as jet substructure, plays a central role in searches for new physics, and precision studies of QCD. Many applications of jet substructure require an understanding of jets initiated by heavy quarks, whose description has...
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Main Authors | , , , |
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Format | Journal Article |
Language | English |
Published |
17.10.2022
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Subjects | |
Online Access | Get full text |
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Summary: | Understanding the detailed structure of energy flow within jets, a field
known as jet substructure, plays a central role in searches for new physics,
and precision studies of QCD. Many applications of jet substructure require an
understanding of jets initiated by heavy quarks, whose description has lagged
behind remarkable recent progress for massless jets. In this Letter, we
initiate a study of correlation functions of energy flow operators on beauty
and charm jets to illuminate the effects of the intrinsic mass of the
elementary particles of QCD. We present a factorization theorem incorporating
the mass of heavy quarks, and show that the heavy quark jet functions for
energy correlators have a simple structure in perturbation theory. Our results
achieve the very first full next-to-leading-logarithmic calculation of the
heavy quark jet substructure observable at the LHC. Using this framework, we
study the behavior of the correlators, and show that they exhibit a clear
transition from a massless scaling regime, at precisely the scale of the heavy
quark mass. This manifests the long-sought-after dead-cone effect and
illustrates fundamental effects from the intrinsic mass of beauty and charm
quarks in a perturbative regime, before they are confined inside hadrons. Our
theoretical framework for studying energy correlators using heavy jets has many
exciting applications for improving the description of mass effects in next
generation parton shower event generators, probing the QGP, and studying heavy
flavor fragmentation functions. |
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Bibliography: | MIT-CTP 5474 |
DOI: | 10.48550/arxiv.2210.09311 |