Measurement of exclusive Upsilon photoproduction in pPb collisions at $\sqrt{s_{NN}}=5.02$ TeV with the CMS

Abstract

The exclusive photoproduction of ${\rm Y}$(1S), ${\rm Y}$(2S) and ${\rm Y}$(3S) mesons is studied in their leptonic (${\mu }^{+}{\mu }^{-}$) decay modes, in ultraperipheral pPb collisions at $\sqrt{s_{NN}}=5.02$ TeV. The data was recorded by the CMS experiment corresponding to an integrated luminosity of $32.6$ nb${}^{-1}$. The differential cross-section for ${\rm Y}$(n) states (n=1,2,3), has been measured as a function of transverse momentum squared $p_T^2$, and rapidity $y$. The ${\rm Y}$(1S) photoproduction cross-section is extracted in the region $|y|<2.2$ as a function of the photon-proton centre-of-mass energies $W_{\gamma p}$, in the range $91<W_{\gamma p}<826$ GeV. The measurements are compared to theoretical predictions and to previous measurements.

5 pages, 7 figures, HardProbes2018, International Conference on Hard and Electromagnetic Probes of High-Energy Nuclear Collisions, 30 September - 5 October 2018, Aix-Les-Bains, Savoie, France

References in corpus (1)

• Measurement of exclusive ${\rm Y}$ photoproduction from protons in pPb collisions at $\sqrt{s_{\mathrm{NN}}}=$ 5.02 TeV