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Measurement of exclusive Upsilon photoproduction from protons in pPb collisions at sqrt{s_NN} = 5.02 TeV
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Measurement of exclusive Upsilon photoproduction from protons in pPb collisions at sqrt{s_NN} = 5.02 TeV
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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 5 Pith papers
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Exclusive photoproduction of a di-meson pair with large invariant mass
Calculations of di-meson photoproduction amplitudes at leading order show cross sections up to 100 times larger than single-meson cases, enabling better GPD extraction.
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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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Exclusive photoproduction of a di-meson pair with large invariant mass
Computes LO amplitudes for di-meson photoproduction channels sensitive to quark GPDs and reports high cross sections suitable for GPD studies at JLab energies.
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Nuclear Cold QCD: Review and Future Strategy
Review summarizing observed cold nuclear matter modifications in hadron-nucleus collision data and proposing experimental strategies for the EIC to clarify underlying QCD mechanisms.
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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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