Exotic T_{c s0}^a(2900)⁰ and T_{c s0}^a(2900)⁺⁺ states in Born-Oppenheimer approximation

2025/11/30 by Halil Mutuk, Mutuk, Halil
Physics and Astronomy · #Quantum Chromodynamics and Particle Interactions #Particle physics theoretical and experimental studies #Quantum and Classical Electrodynamics

paper · pdf · doi:10.48550/arxiv.2512.01028

Abstract

We employ Born-Oppenheimer approximation to the T_{c s0}^a(2900)⁰ and T_{c s0}^a(2900)⁺⁺ states observed by the LHCb Collaboration and study mass spectrum and root-mean-square radius values. For this purpose, we use dynamical diquark model. We assume that strange quark is a heavy for the usage of Born-Oppenheimer approximation. Our results strongly indicate that the T_cs0^a(2900) states are best described as composed of axial-vector (spin-1) diquark pairs. Furthermore, the calculated root-mean-square radius, ⟨ r²⟩^1/2 ≈ 0.70-0.80 fm, which is significantly less than 1 fm, provides compelling evidence that these are compact tetraquarks rather than loosely bound hadronic molecules.

Citations

• Unravelling Pentaquarks with Born--Oppenheimer effective theory
• Diffusion Monte Carlo calculation of compact T_cs0 and T_cs0 tetraquarks
• Hidden-Strangeness Tetraquarks in the Dynamical Diquark Model
• Tetraquarks at large M and large N
• Zur Quantentheorie der Molekeln

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