Mutual boosting of the saturation scales in colliding nuclei
Saturation of small-x gluons in a nucleus, which has the form of transverse momentum broadening of projectile gluons in pA collisions in the nuclear rest frame, leads to a modification of the parton distribution functions in the beam compared with pp collisions. The DGLAP driven gluon distribution t...
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| Main Authors: | , , , |
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| Format: | Article (Journal) |
| Language: | English |
| Published: |
9 February 2011
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| In: |
Physics letters
Year: 2011, Volume: 697, Issue: 4, Pages: 333-338 |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2011.02.018 |
| Online Access: | Verlag, lizenzpflichtig, Volltext: https://doi.org/10.1016/j.physletb.2011.02.018 Verlag, lizenzpflichtig, Volltext: https://www.sciencedirect.com/science/article/pii/S037026931100150X 
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| Author Notes: | B.Z. Kopeliovich, H.J. Pirner, I.K. Potashnikova, Iván Schmidt |
| Summary: | Saturation of small-x gluons in a nucleus, which has the form of transverse momentum broadening of projectile gluons in pA collisions in the nuclear rest frame, leads to a modification of the parton distribution functions in the beam compared with pp collisions. The DGLAP driven gluon distribution turns out to be suppressed at large x, but significantly enhanced at x≪1. This is a high twist effect. In the case of nucleus-nucleus collisions all participating nucleons on both sides get enriched in gluon density at small x, which leads to a further boosting of the saturation scale. We derive reciprocity equations for the saturation scales corresponding to a collision of two nuclei. The solution of these equations for central collisions of two heavy nuclei demonstrate a significant, up to several times, enhancement of QsA2, in AA compared with pA collisions. |
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| Item Description: | Gesehen am 07.07.2022 |
| Physical Description: | Online Resource |
| ISSN: | 1873-2445 |
| DOI: | 10.1016/j.physletb.2011.02.018 |