2021/04/14 by Oscar Garcia-Montero, Garcia-Montero, Oscar
Physics and Astronomy · #FOS: Physical sciences #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Particle physics theoretical and experimental studies #Quantum Chromodynamics and Particle Interactions
paper · pdf · doi:10.48550/arxiv.2104.07050
openalex publication_date 2021/04/14 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
In a recent work from the ALICE collaboration an excess of relatively soft dilepton pairs was reported in p+p collisions at 13 TeV. In the report no satisfactory explanation was found via standard bremsstrahlung computations. In this letter, anomalous dilepton pairs are produced non-perturbatively from the back-reaction of the vacuum to a qq pair, travelling back-to-back. The dilepton spectrum is computed by folding this rate with the cross-section for the process p+p→ qq, which was computed using the framework of the Color Glass Condensate Effective Field Theory (CGC EFT) in the k_⊥-factorized limit. The resulting spectra is compatible within uncertainties with the data, and moreover, provides exciting insight into the non-perturbative phenomena that ultra-soft electromagnetic radiation can probe.