Double -- photon exclusive processes with heavy quark -- heavy antiquark pairs in high-energy Pb-Pb collisions at LHC

Klusek-Gawenda, M.; Szczurek, A.; Machado, M.V.T.; Serbo, V.G.

doi:10.1103/PhysRevC.83.024903

Double -- photon exclusive processes with heavy quark -- heavy antiquark pairs in high-energy Pb-Pb collisions at LHC

M. Klusek-Gawenda
(
- Cracow, INP
)
,
A. Szczurek
(
- Cracow, INP and
- Rzeszow U. Tech.
)
,
M.V.T. Machado
(
- Rio Grande do Sul U.
)
,
V.G. Serbo
(
- Novosibirsk State U.
)

Nov, 2010

12 pages

Published in:

Phys.Rev.C 83 (2011) 024903

e-Print:

1011.1191 [nucl-th]

DOI:

10.1103/PhysRevC.83.024903

View in:

pdf

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Abstract: (arXiv)

The cross section for exclusive heavy quark and heavy antiquark pair (

Q \bar Q

) production in peripheral ultrarelativistic heavy ion collisions is calculated for the LHC energy

\sqrt{s_{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 (EPA) and compare some of them with results obtained by exact calculations of the Feynman diagrams in the momentum space. We include both

Q \bar Q

,

Q \bar Q g

and

Q \bar Q q \bar q

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 diffractive pomeron-pomeron discussed in the literature.

14.65.Dw
14.65.Fy
25.75.Dw
25.20.Lj
charge: density
heavy ion: scattering
CERN LHC Coll
heavy quark: exclusive production
equivalent photon approximation
impact parameter

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