Kavli Affiliate: Philip Marshall
| First 5 Authors: LHCb collaboration, LHCb collaboration, , ,

| Summary:
This paper presents the first measurement of $ψ(2S)$ and $χ_c1(3872)$ meson production within fully reconstructed jets. Each quarkonium state (tag) is reconstructed via its decay to the $J/ψ$($rightarrowμ^+μ^-$)$π^+π^-$ final state in the forward region using proton-proton collision data collected by the LHCb experiment at the center-of-mass-energy of $13 textTeV$ in 2016, corresponding to an integrated luminosity of $1.64 textfb^-1$. The fragmentation function, presented as the ratio of the quarkonium-tag transverse momentum to the full jet transverse momentum ($p_mathrmT(texttag)/p_mathrmT(textjet)$), is measured differentially in $p_mathrmT(textjet)$ and $p_mathrmT(texttag)$ bins. The distributions are separated into promptly produced quarkonia from proton-proton collisions and quarkonia produced from displaced $b$-hadron decays. While the displaced quarkonia fragmentation functions are in general well described by parton-shower predictions, the prompt quarkonium distributions differ significantly from fixed-order non-relativistic QCD (NRQCD) predictions followed by a QCD parton shower.
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