Symmetry and Quantum Chromodynamics in Heavy-Hadron and Quarkonium Production

A special issue of Symmetry (ISSN 2073-8994). This special issue belongs to the section "Physics".

Deadline for manuscript submissions: 30 September 2024 | Viewed by 561

Special Issue Editor


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Guest Editor
Departamento de Física y Matemáticas, Universidad de Alcalá (UAH), Alcalá de Henares, Madrid, Spain
Interests: hadronic structure and 3D proton tomography: transverse-momentum-dependent distributions; QCD at high energies: semi-hard reactions and unintegrated gluon densities; QCD and resummations: unified description of Higgs-boson, Drell-Yan and Quarkonia emissions

Special Issue Information

Dear Colleagues,

Studies on the production of heavy-quark flavored bound states in hadron, lepton, and lepton–hadron scatterings are widely recognized as excellent sounds to unveil the inner dynamics of fundamental interactions and their symmetry laws. Heavy quarks are expected to couple with beyond-the-Standard-Model objects, thus making them sentinels in the search for signals of New Physics. Yet, they can serve as useful tools to make precision studies of strong interactions, the charm and bottom masses lying in a region where perturbative quantum chromodynamics (QCD) is at work. A key role in the QCD context is played by the investigation of reactions featuring the emission of single heavy-flavored objects (principally Lambda baryons and D or B mesons) as well as of heavy quarkonium states. Although being easily studied at the experimental level, the theoretical description of their hadronization mechanism remains a challenge.

The aim of this Special Issue is to collect recent advancements in the description of heavy-flavor production mechanisms in a wide range of kinematic regions, and pioneering analyses on the exotic matter (e.g., hidden-charmed tetraquarks). Particularly welcomed are studies on the heavy-flavor sector as a tool to more deeply test QCD factorizations, resummations, and symmetry phenomena.

Prof. Dr. Francesco Giovanni Celiberto
Guest Editor

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Keywords

  • quantum chromodynamics (QCD)
  • QCD symmetries
  • heavy flavor
  • quarkonia
  • exotic matter
  • production mechanisms
  • nonrelativistic QCD (NRQCD)
  • fragmentation
  • QCD factorizations
  • QCD resummations

Published Papers (1 paper)

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Review

40 pages, 1973 KiB  
Review
Exotic Tetraquarks at the HL-LHC with JETHAD: A High-Energy Viewpoint
by Francesco Giovanni Celiberto
Symmetry 2024, 16(5), 550; https://doi.org/10.3390/sym16050550 - 2 May 2024
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Abstract
We review the semi-inclusive hadroproduction of a neutral hidden-flavor tetraquark with light and heavy quark flavor at the HL-LHC, accompanied by another heavy hadron or a light-flavored jet. We make use of the novel TQHL1.0 determinations of leading-twist fragmentation functions to describe the [...] Read more.
We review the semi-inclusive hadroproduction of a neutral hidden-flavor tetraquark with light and heavy quark flavor at the HL-LHC, accompanied by another heavy hadron or a light-flavored jet. We make use of the novel TQHL1.0 determinations of leading-twist fragmentation functions to describe the formation mechanism of a tetraquark state within the next-to-leading order perturbative QCD. This framework builds on the basis of a spin physics-inspired model, taken as a proxy for the lowest-scale input of the constituent heavy-quark fragmentation channel. Then, all parton-to-tetraquark fragmentation functions are consistently obtained via the above-threshold DGLAP evolution in a variable-flavor number scheme. We provide predictions for a series of differential distributions calculated by the hands of the JETHAD method, well-adapted to NLL/NLO+ hybrid-factorization studies, where the resummation of next-to-leading energy logarithms and beyond is included in the collinear picture. We provide corroborating evidence that high-energy observables sensitive to semi-inclusive tetraquark emissions at the HL-LHC exhibit a fair stability under radiative corrections, as well as MHOU studies. Our analysis constitutes a prime contact point between QCD resummations and the exotic matter. Full article
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