arXiv subjects

Francesca Lonigro

Publications and source records attributed to Francesca Lonigro.

6 recordsLinked to original sources

arXiv2026

Collinear fragmentation of pseudoscalar quarkonia from NLO NRQCD

We discuss a new family of publicly available collinear fragmentation functions (FFs) for pseudoscalar quarkonia, the NRFF1.0 set. It builds upon the Heavy-Flavor Non-Relativistic evolution (HF-NRevo) scheme, designed to describe heavy-hadron formation through leading-power fragmentation at moderate and large transverse momentum. Heavy-quarkonium production naturally involves both perturbative and non-perturbative QCD dynamics, from the production of the heavy $Q\bar{Q}$ pair to its formation into a physical bound state. Within NRFF1.0, Non-Relativistic Quantum Chromodynamics (NRQCD) provides the theoretical framework for calculating the FF inputs at the initial scale, which are subsequently evolved through the HF-NRevo scheme. This setup provides a precision baseline for investigating the underlying partonic hierarchy and jet structure across the moderate- to high-transverse-momentum regime. The explicit treatment of partonic channels and heavy-flavor thresholds makes this framework particularly suitable for exploring quarkonium-in-jet fragmentation, jet-quenching sensitivity, energy-loss mechanisms, and the emergence of medium-modified fragmentation patterns in the quark-gluon plasma.

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arXiv2026

$Z$-plus-jet Production with JETHAD-DYnamis: Angular Structure, Polarization, Fixed-Order Matching

Recent NLO analyses of inclusive Higgs production indicate that high-energy resummation corrections can reach the 10\% level, highlighting the growing impact of high-energy QCD dynamics on electroweak observables from LHC to FCC energies. We extend this precision program to Drell-Yan plus jet production by deriving high-energy-resummed predictions for rapidity and transverse-momentum distributions of electroweak bosons. Fixed-order NLO accuracy is consistently combined with next-to-leading energy-logarithmic resummation (NLL/NLO). We outline a JETHAD-DYnamis-POWHEG matching strategy that retains polarization and angular correlations while enabling realistic lepton-level kinematics. This setup provides the first high-energy-resummed description of rapidity-separated electroweak-boson plus jet final states. The resulting framework offers a precision-oriented description of Drell-Yan observables for present LHC measurements and the High-Luminosity LHC, where percent-level theoretical control will become increasingly important.

hep-ph↗

arXiv2026

Angular correlations and polarization in $Z$+jet production at the LHC

Precision studies at the LHC increasingly require theoretical control over QCD radiation beyond fixed-order perturbation theory, particularly in final states characterised by large separations in rapidity. High-energy logarithms can generate corrections at the ten-percent level even for electroweak-scale observables, as recently observed in Higgs production, motivating their systematic inclusion in precision analyses. We investigate this regime through Drell$-$Yan plus jet production, with particular emphasis on $Z$-boson final states and their angular and polarisation structure. High-energy logarithms are resummed at next-to-leading logarithmic accuracy and consistently combined with NLO fixed-order information. Beyond inclusive rapidity and transverse-momentum spectra, the framework resolves the azimuthal harmonic content of the process, whose pattern is reshaped by the transition from leading- to next-to-leading-order emission dynamics. We further develop the JETHAD$-$DYnamis$-$POWHEG strategy towards realistic lepton-level predictions, retaining spin correlations, decay-angle information, and experimentally accessible kinematics. This programme establishes $Z$+jet production as a precision probe of high-energy QCD dynamics for Run~3 and the HL-LHC.

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arXiv2026

Heavy-Flavor Fragmentation from HF-NRevo: Status, Prospects, and Intrinsic Charm

We report on recent developments of the Heavy-Flavor Non-Relativistic evolution (HF-NRevo) scheme, a framework designed to describe heavy-hadron formation through leading-power fragmentation at moderate and large transverse momentum. The approach combines short-distance inputs obtained from next-to-leading-order NRQCD calculations with collinear scale evolution in a variable-flavor-number scheme, ensuring a consistent treatment of heavy-flavor thresholds and partonic hierarchies. Within this setup we have constructed the NRFF1.0 family of fragmentation functions for $S$-wave heavy quarkonia in their leading NRQCD Fock states. We discuss prospective applications of the HF-NRevo framework in the heavy-ion environment, where it can provide a perturbative baseline for investigating medium-induced modifications of heavy-flavor fragmentation. Its explicit treatment of partonic channels and heavy-flavor thresholds makes it particularly suitable for exploring jet-quenching sensitivity, energy-loss mechanisms, and the emergence of medium-modified fragmentation patterns in the quark-gluon plasma. The HF-NRevo scheme has also been extended to the exotic sector through the TQ4Q1.x and newly released TQ4Q2.0 fragmentation sets, which describe the formation of fully heavy tetraquarks in multiple quantum configurations. These developments open a novel pathway to study quarkoniumlike states and to probe the intrinsic charm content of the proton in forward hadron-collision environments. Altogether, this program broadens the phenomenological reach of heavy-flavor fragmentation studies at the HL-LHC and future collider facilities, opening access to previously unexplored aspects of QCD and potential portals to New Physics.

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arXiv2025

Heavy-Flavor Fragmentation and Jet Structure from HF-NRevo: Bridging to Heavy-Ion Collisions

We present recent progress on the Heavy-Flavor Non-Relativistic Evolution (HF-NRevo) framework, designed to describe leading-power fragmentation of heavy-flavored hadrons at moderate to large transverse momentum. Starting from NLO NRQCD calculations for all partonic channels into pseudoscalar quarkonia, we construct the NRFF1.0 collinear fragmentation functions via DGLAP evolution in a variable-flavor number scheme. We outline future prospects in the heavy-ion context, where HF-NRevo can serve as a baseline for modeling in-medium modifications of heavy-flavor fragmentation in nuclear collisions. Its accurate modeling of the partonic hierarchy and threshold effects makes it ideally suited to explore jet-quenching sensitivity, energy-loss mechanisms, and the emergence of medium-modified fragmentation functions in the quark-gluon plasma. Moreover, it provides a natural baseline for implementing in-medium hadronization scenarios, including quarkonium regeneration and fragmentation-function apparent-shape distortion. These developments provide new handles for exploring heavy-flavor dynamics at the HL-LHC and future collider facilities.

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arXiv2025

Pseudoscalar heavy-quarkonium hadroproduction from nonrelativistic fragmentation at NLL/NLO$^+$

We investigate the inclusive hadroproduction of pseudoscalar heavy quarkonia, $\eta_c$ and $\eta_b$ mesons, in high-energy proton collisions. Our framework bases on the single-parton collinear fragmentation within a variable-flavor number scheme, tailored to describe the moderate to large transverse momentum regime. To this end, we construct a new set of collinear fragmentation functions, denoted as NRFF1.0, which evolve via standard DGLAP equations with a consistent treatment of flavor thresholds. Initial conditions for all parton-induced channels are computed using next-to-leading-order nonrelativistic QCD. We perform our analysis within the NLL/NLO$^+$ hybrid factorization framework, employing the JETHAD numerical interface together with the symJETHAD symbolic engine. These tools allow us to deliver predictions for high-energy observables sensitive to quarkonium final states at 13 TeV LHC. To the best of our knowledge, the NRFF1.0 sets represent the first-ever release of collinear fragmentation functions for heavy quarkonia that consistently includes all partonic channels within collinear factorization.

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