2020/12/03 by A. Drutskoy, Drutskoy, A.
Physics and Astronomy · #Bar (unit) #Environmental science #Exotic hadron #FOS: Physical sciences #Hadron #High Energy Physics - Experiment (hep-ex) #High Energy Physics - Phenomenology (hep-ph) #High-Energy Particle Collisions Research #Meteorology #Nuclear physics #Particle physics #Particle physics theoretical and experimental studies #Physics #Quantum Chromodynamics and Particle Interactions #hep-ex #hep-ph
paper · pdf · doi:10.48550/arxiv.2012.02072
6 pages, 5 figures, proceedings of 40th International Conference on High Energy Physics - ICHEP 2020, July 28 - August 6, 2020, Prague, Czech Republic (virtual meeting)
arxiv created 2020/12/03 · openalex publication_date 2020/12/03 · arxiv updated 2020/12/04 · openalex created_date 2025/10/10 · openalex updated_date 2026/07/28
Prompt and nonprompt productions of exotic multiquark states are studied using the ∼10.4 fb-1 data sample collected by the D0 experiment in Tevatron pp collisions at √(s) = 1.96 TeV. The recent D0 results on the prompt and nonprompt production of the X(3872) and Zc+(3900) states and the Pc pentaquarks at the 4450 MeV region are reported. Signals corresponding to these states are found in the nonprompt production, whereas only the X(3872) state is seen in the prompt production. The ratio of prompt to nonprompt X(3872) production is about three times larger in the D0 measurement than that obtained by the ATLAS experiment at 8 TeV. Theoretically, the production, formation, coalescence, and disassociation processes are expected to be quite different for conventional mesons with a spatial size of (0.4-0.8) fm, compact multiquark states such as tetraquarks with a size of a few fm, and spatially extended molecular states with a size of (4-10) fm. They can be differently affected in prompt hadron-hadron collisions where there are many additional particles emitted from the interaction point. Consequently, the prompt to nonprompt production ratio of spatially extended exotic states can be suppressed at LHC comparing with the Tevatron conditions, because of large difference in the hadron-hadron collisions particle multiplicity. The prompt production studies provide an opportunity to better understand the nature of exotic states.