This title appears in the Scientific Report :
2005
Multiple exchanges in lepton pair production in high-energy heavy ion collisions
Multiple exchanges in lepton pair production in high-energy heavy ion collisions
As an archetype reaction for pQCD multigluon hard processes in collisions of ultrarelativistic nuclei, we analyze generic features of lepton pair production via multiphoton processes in peripheral heavy ion scattering. We report explicit results for collisions of two photons from one nucleus with tw...
Saved in:
Personal Name(s): | Bartos, E. |
---|---|
Gevorkyan, S. R. / Kuraev, E. A. / Nikolaev, N. N. | |
Contributing Institute: |
Institut 3 (Theoretische Kernphysik); IKP-TH |
Published in: | Journal of experimental and theoretical physics, 100 (2005) S. 645 |
Imprint: |
Heidelberg [u.a.]
Springer
2005
|
Physical Description: |
645 |
Document Type: |
Journal Article |
Research Program: |
Physik der Hadronen |
Series Title: |
Journal of Experimental and Theoretical Physics
100 |
Subject (ZB): | |
Publikationsportal JuSER |
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520 | |a As an archetype reaction for pQCD multigluon hard processes in collisions of ultrarelativistic nuclei, we analyze generic features of lepton pair production via multiphoton processes in peripheral heavy ion scattering. We report explicit results for collisions of two photons from one nucleus with two photons from the other nucleus, 2γ + 2γ → l(+)l(-). The results suggest that the familiar eikonalization of Coulomb distortions breaks down for oppositely moving Coulomb centers. The breaking of eikonalization in QED suggests that multigluon pQCD processes cannot be described in terms of collective nuclear gluon distributions. We discuss a logarithmic enhancement of the contribution from the 2γ + 2γ → l(+)l(-) process to production of lepton pairs with large transverse momentum; similar enhancement is absent for the nγ + mγ → l(+)l(-) processes with m, n > 2. We comment on the general structure of multiphoton collisions and properties of higher-order terms that cannot be eikonalized. © 2005 Pleiades Publishing, Inc. | ||
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