RT Journal Article
T1 The nature of X(3872) from high-multiplicity pp collisions
A1 Esposito, Angelo
A1 González Ferreiro, Elena
A1 Pilloni, Alessandro
A1 Polosa, Antonio Davide
A1 Salgado López, Carlos Alberto
AB 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 ψ(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 Υ states. With this at hand, we show that the size of the compact X(3872) would be slightly larger than that of the ψ(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
PB Springer
YR 2021
FD 2021
LK http://hdl.handle.net/10347/26786
UL http://hdl.handle.net/10347/26786
LA eng
NO Eur. Phys. J. C 2021, 81: 669. https://doi.org/10.1140/epjc/s10052-021-09425-w
NO A.E. is supported by the Swiss National Science Foundation under contract 200020-169696 and through the National Center of Competence in Research SwissMAP. A.P. has received funding from the European Union’s Horizon 2020 research and innovation programme under the Marie Skłodowska-Curie grant agreement No. 754496. E.G.F. and C.A.S. are supported by Ministerio de Ciencia e Innovación of Spain under project FPA2017-83814-P; Unidad de Excelencia María de Maetzu under project MDM-2016-0692; and Xunta de Galicia (Consellería de Educación) and FEDER. C.A.S. is supported by ERC-2018-ADG-835105 YoctoLHC
DS Minerva
RD 27 abr 2026