Fragmentation functions for axial-vector heavy tetraquarks: A TQ4Q1.1 update

Abstract

We present and discuss the release of novel sets of collinear, variable-flavor-number-scheme fragmentation functions for axial-vector, fully heavy $T_{4c}(1^{+-})$ and $T_{4b}(1^{+-})$ tetraquarks. Working within the single-parton approximation at leading power and employing nonrelativistic QCD factorization adapted for tetraquark Fock states, we model the initial-scale fragmentation input using a recent calculation for the constituent heavy-quark channel. Standard DGLAP evolution is then applied, ensuring consistent implementation of evolution thresholds. To support phenomenology, we investigate NLL/NLO${}^{+}$ rates for tetraquark-jet systems at the HL-LHC and FCC from (sym)JETHAD. This study further integrates exotic matter explorations with precision QCD calculations.

Comments: 9+7 pages, 4+3 figures. Two novel sets of "TetraQuarks with 4 heavy Quarks" (TQ4Q1.1) NLO collinear fragmentation functions for axial-vector states released in LHAPDF format and publicly available from https://github.com/FGCeliberto/Collinear_FFs/. Version published in Phys. Rev. D Letters