Investigating the composition of the K0*(700) state with π<SUP>±</SUP>KS<SUP>0</SUP> correlations at the LHC

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초록

The first measurements of femtoscopic correlations with the particle pair combinations pi +/- K-S(0) in pp collisions at root 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. Source 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 in the pi +/- K-S(0) system is modeled through a resonant scattering amplitude, defined in terms of a mass and a coupling parameter, 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 increase 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 of the form (q(1), (q(2)) over bar, q(3), (q(3)) over bar) in which q(1), q(2) and q(3) indicate the flavor of the valence quarks of the pi and K-S(0). This latter trend is also confirmed via a simple geometric model that assumes a tetraquark structure of the K-0*(700) resonance.

키워드

COLLISIONSMESONSALICE
제목
Investigating the composition of the K0*(700) state with π<SUP>±</SUP>KS<SUP>0</SUP> correlations at the LHC
저자
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DOI
10.1016/j.physletb.2024.138915
발행일
2024-09
유형
Article
저널명
Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
856