The nature of X(3872) from high-multiplicity pp collisions
| Autor: | Carlos A. Salgado, Angelo Esposito, Elena G. Ferreiro, Antonio D. Polosa, Alessandro Pilloni |
|---|---|
| Přispěvatelé: | Universidade de Santiago de Compostela. Departamento de Física de Partículas, Universidade de Santiago de Compostela. Instituto Galego de Física de Altas Enerxías (IGFAE) |
| Jazyk: | angličtina |
| Rok vydání: | 2021 |
| Předmět: |
Particle physics
Physics and Astronomy (miscellaneous) Meson Nuclear Theory Structure (category theory) charmonium dissociation FOS: Physical sciences QC770-798 Astrophysics 01 natural sciences Exotic hadron Spectroscopy Particle physics Strong Interactions Nuclear Theory (nucl-th) High Energy Physics - Phenomenology (hep-ph) Nuclear and particle physics. Atomic energy. Radioactivity 0103 physical sciences 010306 general physics Engineering (miscellaneous) QCD matter Physics model 010308 nuclear & particles physics Quark model light-nuclei production (anti-)deuteron production Interaction model heavy mesons dependence suppression recombination QB460-466 High Energy Physics - Phenomenology Excited state systems Production (computer science) High Energy Physics::Experiment X(3872) energy |
| Zdroj: | Minerva. Repositorio Institucional de la Universidad de Santiago de Compostela instname Minerva: Repositorio Institucional de la Universidad de Santiago de Compostela Universidad de Santiago de Compostela (USC) European Physical Journal C: Particles and Fields, Vol 81, Iss 7, Pp 1-11 (2021) European Physical Journal |
| Popis: | The structure of exotic resonances that do not trivially fit the usual quark model expectations has been a matter of intense scientific debate during the last two decades. A possible way of estimating the size of these states is to study their behavior when immersed in QCD matter. Recently, LHCb has measured the relative abundance of the exotic $X(3872)$ over the ordinary $\psi(2S)$. We use the comover interaction model to study the yield of a compact $X(3872)$. To confirm the reliability of the model in high-multiplicity $pp$ collisions, we describe the suppression of excited over ground $\Upsilon$ states. With this at hand, we show that the size of the compact $X(3872)$ would be slightly larger than that of the $\psi(2S)$. If the $X(3872)$ is instead assumed to be a meson molecule of large size, we argue that its evolution in QCD matter should be described via a coalescence model, as suggested by data on deuteron production. We show that the predictions of this model for the $X(3872)$ are in contrast with data. Comment: 11 pages, 6 figures. Presentation updated, references added, conclusions unchanged. Version accepted in EPJC |
| Databáze: | OpenAIRE |
| Externí odkaz: |
|