Exotic<i> T</i>acs¯0(2900)0 and<i> T</i>acs¯0(2900) + + states in the Born-Oppenheimer approximation

Mutuk H.

PHYSICAL REVIEW D, vol.113, no.3, 2026 (SCI-Expanded, Scopus) identifier

  • Publication Type: Article / Article
  • Volume: 113 Issue: 3
  • Publication Date: 2026
  • Doi Number: 10.1103/3z79-67zf
  • Journal Name: PHYSICAL REVIEW D
  • Journal Indexes: Science Citation Index Expanded (SCI-EXPANDED), Scopus, Chemical Abstracts Core, INSPEC, MathSciNet, zbMATH, Nature Index
  • Ondokuz Mayıs University Affiliated: Yes

Abstract

We employ the Born-Oppenheimer approximation to the Tacs & strns;0(2900)0 and Tacs & strns;0(2900)++ states observed by the LHCb Collaboration and study mass spectrum and root-mean-square radius values. For this purpose, we use the dynamical diquark model. We assume that a strange quark is heavy for the usage of the Born-Oppenheimer approximation. Our results strongly indicate that the Tacs & strns;0(2900) states are best described as composed of axial-vector (spin-1) diquark pairs. Furthermore, the calculated root-mean-square radius, /r2)1/2 approximate to 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.