The first measurements of femtoscopic correlations with the particle pair combinations 𝜋±K0 S in pp collisions at √𝑠=13TeV 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 𝜋±K0 S 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 (q1, q2, q3, q3) in which q1, q2 and q3 indicate the flavor of the valence quarks of the 𝜋 and K0 S. This latter trend is also confirmed via a simple geometric model that assumes a tetraquark structure of the K∗ 0 (700) resonance.

Acharya, S., Adamová, D., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., et al. (2024). Investigating the composition of the K∗0 (700) state with 𝜋±K0S correlations at the LHC. PHYSICS LETTERS. SECTION B, 856, 1-15 [10.1016/j.physletb.2024.138915].

Investigating the composition of the K∗0 (700) state with 𝜋±K0S correlations at the LHC

Alici, A.;Arcelli, S.;Bellini, F.;Carnesecchi, F.;Colocci, M.;Ercolessi, F.;Jacazio, N.;Malfattore, G.;Rubini, N.;Scioli, G.;Strazzi, S.;
2024

Abstract

The first measurements of femtoscopic correlations with the particle pair combinations 𝜋±K0 S in pp collisions at √𝑠=13TeV 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 𝜋±K0 S 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 (q1, q2, q3, q3) in which q1, q2 and q3 indicate the flavor of the valence quarks of the 𝜋 and K0 S. This latter trend is also confirmed via a simple geometric model that assumes a tetraquark structure of the K∗ 0 (700) resonance.
2024
Acharya, S., Adamová, D., Aglieri Rinella, G., Aglietta, L., Agnello, M., Agrawal, N., et al. (2024). Investigating the composition of the K∗0 (700) state with ��±K0S correlations at the LHC. PHYSICS LETTERS. SECTION B, 856, 1-15 [10.1016/j.physletb.2024.138915].
Acharya, S.; Adamová, D.; Aglieri Rinella, G.; Aglietta, L.; Agnello, M.; Agrawal, N.; Ahammed, Z.; Ahmad, S.; Ahn, S. U.; Ahuja, I.; Akindinov, A.; A...espandi
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/1008308
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