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Measurement of exclusive ρ(770) 0 photoproduction in ultraperipheral pPb collisions at √ s NN = 5.02 TeV
CMS Collaboration
CMS Collaboration
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Abstract
Exclusive ρ(770)
0 photoproduction is measured
for the first time in ultraperipheral pPb collisions at
√
s
NN
=
5.02 TeV with the CMS detector. The cross section σ(γp →
ρ(770)
0p) is 11.0 ± 1.4 (stat) ± 1.0 (syst) μb at Wγ p =
92.6GeV for photon–proton centre-of-mass energies Wγ p
between 29 and 213 GeV. The differential cross section
dσ/d|t| is measured in the interval 0.025 < |t| < 1GeV2
as a function of Wγ p , 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) has a power-law
dependence on the photon–proton centre-of-mass, consistent
with electron–proton collision measurements performed at
HERA. The Wγ p dependence of the exponential slope of the
differential cross section dσ/d|t| is also measured.
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2019-08-05
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Springer Verlag
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Sirunyan, A.M., Tumasyan, A., Adam, W. et al. Eur. Phys. J. C (2019) 79: 702. https://doi.org/10.1140/epjc/s10052-019-7202-9