Related Experiment Video
Updated: Jan 22, 2026

Laboratory Drop Towers for the Experimental Simulation of Dust-aggregate Collisions in the Early Solar System
Published on: June 5, 2014
Observation of Coherent ϕ(1020) Meson Photoproduction in Ultraperipheral PbPb Collisions at sqrt[s_{NN}]=5.36 TeV
V Chekhovsky1, A Hayrapetyan1, V Makarenko1
1Yerevan Physics Institute, Yerevan, Armenia.
Abstract:
The first observation of coherent ϕ(1020) meson photoproduction off heavy nuclei is presented using ultraperipheral lead-lead collisions at a center-of-mass energy per nucleon pair of 5.36 TeV. The data were collected by the CMS experiment and correspond to an integrated luminosity of 1.62 μb^{-1}. The ϕ(1020) meson signals are reconstructed via the K^{+}K^{-} decay channel. The production cross section is presented as a function of the ϕ(1020) meson rapidity in the range 0.3<|y|<1.0, probing gluons that carry a fraction of the nucleon momentum (x) around 10^{-4}. The observed cross section exhibits little dependence on rapidity and is significantly suppressed, by a factor of ∼5, compared to a baseline model that treats a nucleus as a collection of free nucleons. Theoretical models that incorporate the nuclear shadowing effect generally provide a better description of the ϕ(1020) data than those incorporating gluon saturation. This study establishes a powerful new tool for exploring nuclear effects and nuclear gluonic structure in the small-x regime at a unique energy scale bridging the perturbative and nonperturbative quantum chromodynamics domains.
More Related Videos
07:56Assessing the Coherence of Parents' Short Narratives Regarding their Child Using the Five-Minute Speech Sample Procedure
Published on: September 19, 2019
08:09Production of Dynein and Kinesin Motor Ensembles on DNA Origami Nanostructures for Single Molecule Observation
Published on: October 15, 2019
Related Concept Videos
Types Of Collisions - I
Types of Collisions - II
Basic Postulates of Kinetic Molecular Theory: Particle Size, Energy, and Collision
Elastic Collisions: Introduction
Elastic Collisions: Case Study
Collisions in Multiple Dimensions: Introduction