Measurement of ?c1(3872) production in proton-proton collisions at $$ \sqrt{s} $$ = 8 and 13 TeV

The production cross-section of the $\chi_{c1}(3872)$ state relative to $\psi(2S)$ meson is measured using proton-proton collision data collected with LHCb experiment at centre-of-mass energies $\sqrt{s}=8$ and 13 TeV, corresponding integrated luminosities 2.0 5.4 fb$^{-1}$, respectively. two mesons are reconstructed in $J/\psi\pi^{+}\pi^{-}$ final state. ratios prompt nonprompt cross-sections as a function transverse momentum, $p_{\rm T}$, rapidity, $y$, kinematic range $4 < p_{\rm T} 20$ GeV/$c$ $2.0 y 4.5$. ratio found increase T}$ independently $y$. double-differential between 8 TeV also for component observed be consistent unity, independent energy.