Double-photon exclusive processes with heavy-quark-heavy-antiquark pairs in high-energy Pb-Pb collisions at energies available at the CERN Large Hadron Collider

Journal Article · Tue Feb 15 00:00:00 EST 2011 · Physical Review. C, Nuclear Physics

DOI:https://doi.org/10.1103/PHYSREVC.83.024903· OSTI ID:21499429

Klusek-Gawenda, M ^[1]; Szczurek, A ^[1]; Machado, M V. T. ^[2]; Serbo, V G ^[3]

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1. Institute of Nuclear Physics PAN, PL-31-342 Cracow (Poland)
2. High Energy Physics Phenomenology Group, GFPAE IF-UFRGS, Caixa Postal 15051, CEP 91501-970, Porto Alegre, RS (Brazil)
3. Novosibirsk State University, Pirogova 2, 630090, Novosibirsk (Russian Federation)

The cross section for exclusive heavy-quark and heavy-antiquark pair (QQ-bar) production in peripheral ultrarelativistic heavy-ion collisions is calculated at an energy available at the CERN Large Hadron Collider, i.e., {radical}(s{sub NN}) = 5.5 TeV. Here we consider only processes with photon-photon interactions and omit diffractive contributions. We present results in the impact parameter equivalent photon approximation and compare some of them with results obtained by exact calculations of the Feynman diagrams in the momentum space. We include QQ-bar, QQ-barg, and QQ-barqq-bar final states as well as photon single-resolved components. Realistic charge densities in nuclei were taken in the calculation. The different components give contributions of the same order of magnitude to the nuclear cross section. The cross sections found here are smaller than those for the diffractive photon-Pomeron mechanism and larger than the diffractive Pomeron-Pomeron discussed in the literature.

• OSTI ID: 21499429
• Journal Information: Physical Review. C, Nuclear Physics, Vol. 83, Issue 2; Other Information: DOI: 10.1103/PhysRevC.83.024903; (c) 2011 American Institute of Physics; ISSN 0556-2813
• Country of Publication: United States
• Language: English

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CROSS SECTIONS
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