Bibliographic Details
| Title: |
QCD evolution based evidence for the onset of gluon saturation in exclusive photo-production of vector mesons |
| Authors: |
Garcia, A. Arroyo, Hentschinski, M., Kutak, K. |
| Publication Year: |
2019 |
| Collection: |
High Energy Physics - Phenomenology |
| Subject Terms: |
High Energy Physics - Phenomenology |
| More Details: |
We investigate photo-production of vector mesons J/Psi and Upsilon measured both at HERA and LHC, using 2 particular fits of inclusive unintegrated gluon distributions, based on non-linear Balitsky-Kovchegov evolution (Kutak-Sapeta gluon; KS) and next-to-leading order Balitsky-Fadin-Kuraev-Lipatov evolution (Hentschinski-Sabio Vera-Salas gluon; HSS). We find that linear next-to-leading order evolution can only describe production at highest energies, if perturbative corrections are increased to unnaturally large values; rendering this corrections to a perturbative size, the growth with energy is too strong and the description fails. At the same time, the KS gluon, which we explore both with and without non-linear corrections, requires the latter to achieve an accurate description of the energy dependence of data. We interpret this observation as a clear signal for the presence of high gluon densities in the proton, characteristic for the onset of gluon saturation.
Comment: 14 pages, 6 figures; references updated |
| Document Type: |
Working Paper |
| DOI: |
10.1016/j.physletb.2019.06.061 |
| Access URL: |
http://arxiv.org/abs/1904.04394 |
| Accession Number: |
edsarx.1904.04394 |
| Database: |
arXiv |
