Title screen

[References: 48 tit.]

Exclusive ρ(770)0ρ(770)0 photoproduction is measured for the first time in ultraperipheral pPb collisions at sNN−−−√=5.02TeVsNN=5.02TeV with the CMS detector. The cross section σ(γp→ρ(770)0p)σ(γp→ρ(770)0p) is 11.0±1.4(stat)±1.0(syst)11.0±1.4(stat)±1.0(syst) μμb at ⟨Wγp⟩=92.6GeV⟨Wγp⟩=92.6GeV for photon-proton centre-of-mass energies WγpWγp between 29 and 213GeV213GeV. The differential cross section dσ/d|t|dσ/d|t| is measured in the interval 0.025<|t|<1GeV20.025<|t|<1GeV2 as a function of WγpWγp, where t is the squared four-momentum transfer at the proton vertex. The results are compared with previous measurements and theoretical predictions. The measured cross section σ(γp→ρ(770)0p)σ(γp→ρ(770)0p) has a power-law dependence on the photon-proton centre-of-mass, consistent with electron-proton collision measurements performed at HERA. The WγpWγp dependence of the exponential slope of the differential cross section dσ/d|t|dσ/d|t| is also measured.