CMS-PAS-FSQ-16-007

CMS-PAS-FSQ-16-007
Exclusive $\rho(770)^{0}$ photoproduction in ultra-peripheral pPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} =$ 5.02 TeV with the CMS experiment
CMS Collaboration
September 2018

Abstract: Exclusive $\rho(770)^{0}$ photoproduction is studied for the first time in ultra-peripheral pPb collisions at ${\sqrt {\smash [b]{s_{_{\mathrm {NN}}}}}} =$ 5.02 TeV. The cross section, $\sigma (\gamma \mathrm{p} \rightarrow \rho(770)^{0} \rm{p})$ , is measured for photon-proton centre-of-mass energies, $W_{\gamma \rm{p}}$ , between 29 and 213 GeV with the CMS experiment. The integrated cross section is measured to be $\sigma =$ 11.2 $\pm$ 1.4 (stat) $\pm$ 1.0 (syst) $\mu$ b. The differential cross section ${\mathrm{d}}\sigma/{\mathrm{d}}\|t\|$ is measured in the 0.025 $< \|t\| <$ 1.000 GeV $^{2}$ interval as a function of $W_{\gamma \rm{p}}$ , where $t$ is the squared four-momentum transfer at the proton vertex. The results are compared to previous measurements and theoretical predictions. The measured cross section $\sigma (\gamma \mathrm{p} \rightarrow \rho(770)^{0}\rm{p})$ has a power-law energy dependence, consistent with HERA measurements. The $W_{\gamma \rm{p}}$ dependence of the exponential slope of the ${\mathrm{d}}\sigma/{\mathrm{d}}\|t\|$ cross section for exclusive $\rho(770)^{0}$ photoproduction is also measured.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ; These preliminary results are superseded in this paper, EPJC 79 (2019) 702. The superseded preliminary plots can be found here.

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