356862 20250630143507.0 10.17182/HEPDATA.153749 doi GSI-2025-00245 English ALICE Collaboration P:(DE-HGF)0 0 Corresponding author Investigating the nature of the K$^*_0(700)$ state with $\pi^\pm$K$^0_{\rm S}$ correlations at the LHC 2024 MISC BibTeX Dataset dataset dataset PUB:(DE-HGF)32 1736858577_1023712 PUB:(DE-HGF) Chart or Table 26 EndNote Dataset DataCite DATA_SET ORCID ResearchData DINI Journal Article GSI record: GSI-2025-00244 Investigating the nature of the K$^*_0(700)$ state with $\pi^\pm$ K$^0_{\rm S}$ correlations at the LHC. -- The first measurements of femtoscopic correlations with the particle pair combinations $\pi^\pm$ K$^0_{\rm S}$ in pp collisions at $\sqrt{s}=13$ TeV at the Large Hadron Collider 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 $\pi^\pm$K$^0_{\rm S}$ 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. 612 - Cosmic Matter in the Laboratory (POF4-612) G:(DE-HGF)POF4-612 POF4-612 POF IV 0 HGS-HIRe - HGS-HIRe for FAIR (HGS-HIRe) G:(DE-Ds200)HGS-HIRe HGS-HIRe 1 SUC-GSI-Heidelberg - Strategic university cooperation GSI-U Heidelberg (SUC-GSI-HE) G:(DE-Ds200)SUC-GSI-HE SUC-GSI-HE 2 SUC-GSI-Frankfurt - Strategic university cooperation GSI-U Frankfurt/M (SUC-GSI-FR) G:(DE-Ds200)SUC-GSI-FR SUC-GSI-FR 3 SUC-GSI-Darmstadt - Strategic university cooperation GSI-TU Darmstadt (SUC-GSI-DA) G:(DE-Ds200)SUC-GSI-DA SUC-GSI-DA 4 STRONG-2020 - The strong interaction at the frontier of knowledge: fundamental research and applications (824093) G:(EU-Grant)824093 824093 H2020-INFRAIA-2018-1 5 Dataset connected to DataCite LHC LHC: ALICE EXP:(DE-588)4398783-7 EXP:(DE-H253)LHC-Exp-ALICE-20150101 EXP:(DE-H253)LHC-Exp-ALICE-20150101 0 10.17182/HEPDATA.153749 Acharya, Shreyasi et.al. Amsterdam : North-Holland Publ., 2024 RelatedTo GSI-2025-00244 arXiv:2312.12830 ; CERN-EP-2023-287 Investigating the composition of the $K_0^⁎(700)$ state with $π±K_S^0$ correlations at the LHC oai:repository.gsi.de:356862 openaire VDB ec_fundedresources DE-HGF Forschungsbereich Materie Matter and the Universe G:(DE-HGF)POF4-610 G:(DE-HGF)POF4-612 G:(DE-HGF)POF4 G:(DE-HGF)POF4-600 G:(DE-HGF)POF Cosmic Matter in the Laboratory 0 2024 yes I:(DE-Ds200)ALI-20080822OR105 ALI ALICE 0 I:(DE-Ds200)DTL-20051214OR031 DTL Detektorlabor 1 I:(DE-Ds200)CIT-20110310OR121 CIT IT 2 I:(DE-Ds200)EXM-20080818OR100 EXM ExtreMe Matter Institute, EMMI 3 I:(DE-Ds200)Coll-CERN-ALICE ALICE@CERN Collaboration CERN: ALICE 4 dataset VDB I:(DE-Ds200)ALI-20080822OR105 I:(DE-Ds200)DTL-20051214OR031 I:(DE-Ds200)CIT-20110310OR121 I:(DE-Ds200)EXM-20080818OR100 I:(DE-Ds200)Coll-CERN-ALICE UNRESTRICTED