Investigating the nature of the K∗0(700) state with π±K0S correlations at the LHC
ALICE Collaboration. (2024). Investigating the nature of the K∗0(700) state with π±K0S correlations at the LHC. Physics Letters B, 856, Article 138915. https://doi.org/10.1016/j.physletb.2024.138915
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Physics Letters BAuthors
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2024Copyright
© 2024 The Author(s). Published by Elsevier B.V. Funded by SCOAP³.
The first measurements of femtoscopic correlations with the particle pair combinations π±K0S in pp collisions at s√=13 TeV at the Large Hadron Collider (LHC) are reported by the ALICE experiment. Using the femtoscopic approach, it is shown that it is possible to study the elusive K∗0(700) particle that has been considered a tetraquark candidate for over forty years. Boson source parameters and final-state interaction parameters are extracted by fitting a model assuming a Gaussian source to the experimentally measured two-particle correlation functions. The final-state interaction is modeled through a resonant scattering amplitude, defined in terms of a mass and a coupling parameter, decaying into a π±K0S pair. The extracted mass and Breit-Wigner width, derived from the coupling parameter, of the final-state interaction are found to be consistent with previous measurements of the K∗0(700). The small value and increasing behavior of the correlation strength with increasing source size support the hypothesis that the K∗0(700) is a four-quark state, i.e. a tetraquark state. This latter trend is also confirmed via a simple geometric model that assumes a tetraquark structure of the K∗0(700) resonance.
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European Commission; Research Council of FinlandFunding program(s)
RIA Research and Innovation Action, H2020; Centre of Excellence, AoF
The content of the publication reflects only the author’s view. The funder is not responsible for any use that may be made of the information it contains.
Additional information about funding
European Research Council, Strong 2020 - Horizon 2020 (grant nos. 950692, 824093), European Union; ICSC - Centro Nazionale di Ricerca in High Performance Computing, Big Data and Quantum Computing, European Union - NextGenerationEU; Academy of Finland (Center of Excellence in Quark Matter) (grant nos. 346327, 346328), Finland.License
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