Результаты исследований: Научные публикации в периодических изданиях › статья › Рецензирование
The first measurement of the cross section for coherent J/ψ photoproduction as a function of |t|, the square of the momentum transferred between the incoming and outgoing target nucleus, is presented. The data were measured with the ALICE detector in ultra-peripheral Pb–Pb collisions at a centre-of-mass energy per nucleon pair sNN=5.02TeV with the J/ψ produced in the central rapidity region |y|<0.8, which corresponds to the small Bjorken-x range (0.3−1.4)×10−3. The measured |t|-dependence is not described by computations based only on the Pb nuclear form factor, while the photonuclear cross section is better reproduced by models including shadowing according to the leading-twist approximation, or gluon-saturation effects from the impact-parameter dependent Balitsky–Kovchegov equation. These new results are therefore a valid tool to constrain the relevant model parameters and to investigate the transverse gluonic structure at very low Bjorken-x.
Язык оригинала | английский |
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Номер статьи | 136280 |
Число страниц | 13 |
Журнал | Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics |
Том | 817 |
DOI | |
Состояние | Опубликовано - 1 июн 2021 |
ID: 85914656