2016/06/30 by Piotr Lebiedowicz, Marta Luszczak, Lebiedowicz, Piotr +6
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 #hep-ph
paper · pdf · doi:10.48550/arxiv.1606.09469
6 pages, 5 figures, 1 table, talk presented by A. Szczurek at DIS2016 conference, 11-15 April 2016, DESY Hamburg, Germany
arxiv created 2016/06/30 · openalex publication_date 2016/06/30 · arxiv updated 2016/07/01 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
We discuss whether the enhancement in the diphoton final state at Mγγ = 750 GeV, observed recently by the ATLAS and CMS Collaborations could be a neutral pseudoscalar technipion π0. We considered two distinct minimal models for the dynamical electroweak symmetry breaking. Here we concentrate only on two-flavor vector-like technicolor model and we assume that the two-photon fusion is a dominant production mechanism. We include contributions of 2 → 1, 2 → 2 and 2 → 3 partonic processes. All the mechanisms give similar contributions to the cross section. With the strong Yukawa (technipion-techniquark) coupling gTC ≃ 20 we roughly obtain the measured cross section of the "signal". With such value of gTC we get a relatively small total decay width Γ\rm tot. We discuss also the size of the signal at lower energies (LHC, Tevatron) for γγ final states, where the enhancement was not observed. We predict a measurable cross section for neutral technipion production associated with one or two soft jets. The technipion signal is compared with the Standard Model diphoton background contributions. We observe the dominance of inelastic-inelastic γγ processes. We predict the signal cross section for purely exclusive p p → p p γγ procesess at √(s) = 13 TeV to be about 0.2 fb. Such a cross section would be, however, difficult to measure with the planned integrated luminosity. We conclude that in all considered cases the signal is below the background or/and below the threshold set by statistics although some tension can be seen.