Mutual boosting of the saturation scales in colliding nuclei

• Verfasst von: Kopeliovich, Boris Z. [VerfasserIn]
• Verfasst von: Pirner, Hans J. [VerfasserIn]
• Verfasst von: Potashnikova, I. K. [VerfasserIn]
• Verfasst von: Schmidt, Iván [VerfasserIn]
• Titel: Mutual boosting of the saturation scales in colliding nuclei
• Verf.angabe: B.Z. Kopeliovich, H.J. Pirner, I.K. Potashnikova, Iván Schmidt
• E-Jahr: 2011
• Jahr: 9 February 2011
• Umfang: 6 S.
• Fussnoten: Gesehen am 07.07.2022
• Titel Quelle: Enthalten in: Physics letters / B
• Ort Quelle: Amsterdam : North-Holland Publ., 1967
• Jahr Quelle: 2011
• Band/Heft Quelle: 697(2011), 4, Seite 333-338
• ISSN Quelle: 1873-2445
• DOI: doi:10.1016/j.physletb.2011.02.018
• Datenträger: Online-Ressource
• Sprache: eng
• Sach-SW: Broadening
• Sach-SW: Charm
• Sach-SW: Nuclei
• Sach-SW: Partons
• Sach-SW: Saturation
• K10plus-PPN: 1809414504

Abstract

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.