Using hadron-in-jet data in a global analysis of D* fragmentation functions

Abstract

We present a novel global QCD analysis of charged D Ã -meson fragmentation functions at next-toleading order accuracy. This is achieved by making use of the available data for single-inclusive D Ã -meson production in electron-positron annihilation, hadron-hadron collisions, and, for the first time, in-jet fragmentation in proton-proton scattering. It is shown how to include all relevant processes efficiently and without approximations within the Mellin moment technique, specifically for the in-jet fragmentation cross section. The presented technical framework is generic and can be straightforwardly applied to future analyses of fragmentation functions for other hadron species, as soon as more in-jet fragmentation data become available. We choose to work within the zero mass variable flavor number scheme which is applicable for sufficiently high energies and transverse momenta. The obtained optimum set of parton-to-D Ã fragmentation functions is accompanied by Hessian uncertainty sets which allow one to propagate hadronization uncertainties to other processes of interest.

Jet fragmentation functions for Z-tagged jets

“…Jet fragmentation functions have been measured for single inclusive jet produced in unpolarized proton-proton collisions at the Large Hadron Collider (LHC) for light hadrons [1,2], for open heavy flavor mesons [3,4,5], and for heavy quarkonium [6,7]. Such measurements have already started to constrain the fragmentation functions for open heavy flavor mesons [8,9], and to pin down non-relativistic QCD (NRQCD) long-distance matrix elements, which characterize the hadronization process for heavy quarkonium production [10,11].…”

Charged hadron fragmentation functions from collider data

“…[19, 20], where SIDIS and pp data was also included. The FFs of heavier hadrons, such as  [21, 22],  [23, 24] and  [25], were also studied, mostly from SIA measurements, although available data is in general scarcer than for light hadrons.…”

Direct- and resolved-photon threshold resummation for polarized high- pT hadron production at COMPASS

“…Nevertheless, the fragmentation functions arguably remain a primary source of systematic theoretical uncertainty, so that continued improvements of the functions are necessary. Promising avenues in this direction are perhaps offered by studies of hadron fragmentation inside jets [39][40][41][42].…”