Energy dependence of dissociative J/ψ photoproduction as a signature of gluon saturation at the LHC

Physics Letters B

J.D. Tapia Takaki¹  J. Cepila²  J.G. Contreras² 

[1] Department of Physics and Astronomy, The University of Kansas, Lawrence, KS, USA;Faculty of Nuclear Sciences and Physical Engineering, Czech Technical University in Prague, Czech Republic;

关键词: Gluon saturation;    Vector meson photoproduction;    LHC;   

DOI  :  10.1016/j.physletb.2016.12.063

来源: DOAJ

【 摘 要 】

We have developed a model in which the quantum fluctuations of the proton structure are characterised by hot spots, whose number grows with decreasing Bjorken-x. Our model reproduces the F2(x,Q2) data from HERA at the relevant scale, as well as the exclusive and dissociative J/ψ photoproduction data from H1 and ALICE. Our model predicts that for Wγp≈500 GeV, the dissociative J/ψ cross section reaches a maximum and then decreases steeply with energy, which is in qualitatively good agreement to a recent observation that the dissociative J/ψ background in the exclusive J/ψ sample measured in photoproduction by ALICE decreases as energy increases. Our prediction provides a clear signature for gluon saturation at LHC energies.

【 授权许可】

Unknown