Bottomoniumlike states in proton collisions: Fragmentation and resummation

TL;DR

This paper develops new fragmentation functions within a variable-flavor number scheme to predict the production of bottomoniumlike tetraquarks in high-energy proton collisions, extending theoretical models and providing novel phenomenological predictions.

Contribution

It introduces new collinear fragmentation functions TQHL1.1 and TQ4Q1.1 for bottomoniumlike tetraquarks, based on improved models and potential nonrelativistic QCD calculations.

Findings

New fragmentation functions for doubly and fully heavy tetraquarks.

Predictions for tetraquark-plus-jet distributions at 14 TeV and 100 TeV.

Extension of theoretical models to include high-energy collider phenomenology.

Abstract

We study the semi-inclusive hadroproduction of doubly bottomed tetraquarks ($X_{b\bar{b}q\bar{q}}$) as well as fully bottomed ones ($T_{4b}$), to which we collectively refer as "bottomoniumlike" states. We rely upon the variable-flavor number-scheme fragmentation at leading power, where a single parton perturbatively splits into the corresponding Fock state, which then hadronizes into the color-neutral, observed tetraquark. To this end, we build new sets of DGLAP/HF-NRevo consistent, hadron-structure oriented collinear fragmentation functions, which we name TQHL1.1 and TQ4Q1.1 parametrizations. They extend and supersede the corresponding 1.0 versions recently derived in previous works. The first family describes the fragmentation of doubly heavy tetraquarks and is based on an improved version of the Suzuki model for the heavy-quark channel. The second family depicts the fragmentation of fully heavy tetraquarks and embodies initial-scale inputs for gluon and heavy-quark channels, both of them calculated by the hands of potential nonrelativistic QCD. As a phenomenological application, we provide novel predictions for tetraquark-plus-jet high-energy distributions, computed within the NLL/NLO$^+$ hybrid factorization from (sym)JETHAD, at 14 TeV and 100 TeV FCC.