Abstract
In these proceedings, we discuss the role of heavy quark mass on the formation of parton showers. Mass effects are not well understood when parton branching occurs in nuclear matter, such as the quark-gluon plasma. Recently, a theoretically consistent picture of open heavy flavor production in ultra relativistic nuclear collisions has begun to emerge based on effective theories of QCD, such as soft collinear effective theory with Glauber gluons. We show that implementation of in-medium splitting processes containing heavy quarks into next-to-leading order calculations of heavy flavor production leads to larger cross section suppression when compared to traditional energy loss phenomenology. To better constrain the important mass dependence of in-medium splitting functions, we propose a new measurement in relativistic heavy ion collisions, based on a two-prong structure inside a reconstructed heavy flavor jet. In the region of jet transverse momenta where parton mass effects are leading, we predict a unique reversal of the mass hierarchy of jet quenching effects in heavy ion relative to proton collisions. We find that the momentum sharing distribution of prompt b-tagged jets is more strongly modified in comparison to the one for light jets. The work summarized here opens new directions of research on the substructure of heavy flavor jets.
Highlights
Understanding the production and structure of hadronic jets is crucial to test perturbative Quantum Chromodynamics (QCD) and make full use of the data from today’s high energy collider experim√ents
In this Letter, we presented the first resummed calculation of the soft-drop groomed momentum sharing distributions in heavy ion collisions in the framework of recently developed effective theories of light parton and heavy quark propagation in the dense QCD matter
We demonstrated that jet splitting functions are especially sensitive to the ways in which the mass of heavy quarks affects the formation of parton showers and can be used to constrain the still not well understood dead cone effect in the quark-gluon plasma (QGP)
Summary
Understanding the production and structure of hadronic jets is crucial to test perturbative Quantum Chromodynamics (QCD) and make full use of the data from today’s high energy collider experim√ents. But perturbatively accessible, transverse momenta at the Relativistic Heavy Ion Collider (RHIC) it was noticed early on that the anticipated mass effect on B-meson quenching is not reflected in the suppression of non-photonic electrons coming from the semileptonic decays of open heavy flavor [7] This discrepancy has stimulated extensive theoretical work, for a comprehensive review that covers theory and experi-. It was shown that the nuclear modification of the jet momentum sharing distribution [16] is directly related to the in-medium splitting functions [17], which can be obtained in the framework of soft-collinear effective theory with Glauber gluon interactions (SCETG) [18, 19].
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