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Measurement of exclusive $\Upsilon$ photoproduction from protons in pPb collisions at $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV
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abstract
The exclusive photoproduction of $\Upsilon$(nS) meson states from protons, $\gamma$p $ \to\Upsilon$(nS)p (with n = 1, 2, 3), is studied in ultraperipheral pPb collisions at a centre-of-mass energy per nucleon pair of $\sqrt{s_\mathrm{NN}} =$ 5.02 TeV. The measurement is performed using the $\Upsilon$(nS) $\to \mu^+\mu^-$ decay mode, with data collected by the CMS experiment corresponding to an integrated luminosity of 32.6 nb$^{-1}$. Differential cross sections as functions of the $\Upsilon$(nS) transverse momentum squared $p_\mathrm{T}^2$, and rapidity $y$, are presented. The $\Upsilon$(1S) photoproduction cross section is extracted in the rapidity range $|y|$ $<$ 2.2, which corresponds to photon-proton centre-of-mass energies in the range 91 $<$ W$_{\gamma \mathrm{p}}$ $<$ 826 GeV. The data are compared to theoretical predictions based on perturbative quantum chromodynamics and to previous measurements.
Forward citations
Cited by 4 Pith papers
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Spin resummation of heavy quarkonium photoproduction: from the gluonic gravitational form factors to the holographic pomeron
Spin-resummed holographic QCD unifies near-threshold GFF and high-energy pomeron regimes for heavy quarkonium photoproduction and shows fixed-spin GFF extraction is not controlled.
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Gluon Saturation Effects in Exclusive Heavy Vector Meson Photoproduction
Exclusive J/psi photoproduction off Pb targets prefers BK evolution with gluon saturation over linear BFKL evolution, and Upsilon production is predicted to distinguish them only at higher energies.
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A generator of forward neutrons for ultra-peripheral collisions: $\textbf{n$\mathbf{_O^O}$n}$
nOOn is a ROOT-based Monte Carlo generator that produces event-by-event forward neutrons from electromagnetic dissociation in ultra-peripheral heavy-ion collisions, using measured photoneutron cross sections and a log...
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Ultra-peripheral Collisions
Ultra-peripheral collisions of heavy ions are reviewed as the energy frontier for photon physics; the paper consolidates a decade of LHC/RHIC results and proposes no new measurement.
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