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2-category 2-category-theory abelian-categories adjoint algebra algebraic algebraic-geometry algebraic-topology analysis analytic-geometry arithmetic arithmetic-geometry book bundles calculus categorical categories category category-theory chern-weil-theory cohesion cohesive-homotopy-type-theory cohomology colimits combinatorics complex complex-geometry computable-mathematics computer-science constructive cosmology deformation-theory descent diagrams differential differential-cohomology differential-equations differential-geometry digraphs duality elliptic-cohomology enriched fibration foundation foundations functional-analysis functor gauge-theory gebra geometric-quantization geometry graph graphs gravity grothendieck group group-theory harmonic-analysis higher higher-algebra higher-category-theory higher-differential-geometry higher-geometry higher-lie-theory higher-topos-theory homological homological-algebra homotopy homotopy-theory homotopy-type-theory index-theory integration integration-theory internal-categories k-theory lie-theory limits linear linear-algebra locale localization logic mathematics measure measure-theory modal modal-logic model model-category-theory monad monads monoidal monoidal-category-theory morphism motives motivic-cohomology nlab noncommutative noncommutative-geometry number-theory of operads operator operator-algebra order-theory pages pasting philosophy physics pro-object probability probability-theory quantization quantum quantum-field quantum-field-theory quantum-mechanics quantum-physics quantum-theory question representation representation-theory riemannian-geometry scheme schemes set set-theory sheaf simplicial space spin-geometry stable-homotopy-theory stack string string-theory superalgebra supergeometry svg symplectic-geometry synthetic-differential-geometry terminology theory topology topos topos-theory tqft type type-theory universal variational-calculus

1. • CommentRowNumber1.
   • CommentAuthorUrs
   • CommentTimeApr 12th 2020
   • PermaLink
   Author: Urs
   Format: MarkdownItexa stub, for the moment <a href="https://ncatlab.org/nlab/revision/tetraquark/1">v1</a>, <a href="https://ncatlab.org/nlab/show/tetraquark">current</a>

   a stub, for the moment

   v1, current

2. • CommentRowNumber2.
   • CommentAuthorUrs
   • CommentTimeAug 17th 2021
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded references ([here](https://ncatlab.org/nlab/show/tetraquark#ExperimentalDetection)) on the recent experimental detection of the first presumably "true" tetraquark state <a href="https://ncatlab.org/nlab/revision/diff/tetraquark/4">diff</a>, <a href="https://ncatlab.org/nlab/revision/tetraquark/4">v4</a>, <a href="https://ncatlab.org/nlab/show/tetraquark">current</a>

   added references (here) on the recent experimental detection of the first presumably “true” tetraquark state

   diff, v4, current

3. • CommentRowNumber3.
   • CommentAuthorUrs
   • CommentTimeAug 27th 2021
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded pointer to what looks like the origin of the idea: * J.P. Ader, J.M. Richard, P. Taxil, *Do narrow heavy multiquark states exist?*, Phys. Rev. D 25 (1982) 2370 ([doi:10.1103/PhysRevD.25.2370](https://doi.org/10.1103/PhysRevD.25.2370), [spire:166170](https://inspirehep.net/literature/166170)) <a href="https://ncatlab.org/nlab/revision/diff/tetraquark/6">diff</a>, <a href="https://ncatlab.org/nlab/revision/tetraquark/6">v6</a>, <a href="https://ncatlab.org/nlab/show/tetraquark">current</a>

   added pointer to what looks like the origin of the idea:

   • J.P. Ader, J.M. Richard, P. Taxil, Do narrow heavy multiquark states exist?, Phys. Rev. D 25 (1982) 2370 (doi:10.1103/PhysRevD.25.2370, spire:166170)

   diff, v6, current

4. • CommentRowNumber4.
   • CommentAuthorUrs
   • CommentTimeSep 3rd 2021
   • (edited Sep 3rd 2021)
   • PermaLink
   Author: Urs
   Format: MarkdownItexadded pointer to today's: * [[LHCb collaboration]], *Observation of an exotic narrow doubly charmed tetraquark* ([arXiv:2109.01038](https://arxiv.org/abs/2109.01038)) * [[LHCb collaboration]], *Study of the doubly charmed tetraquark $T^+_{c c}$* ([arXiv:2109.01056](https://arxiv.org/abs/2109.01056)) <a href="https://ncatlab.org/nlab/revision/diff/tetraquark/8">diff</a>, <a href="https://ncatlab.org/nlab/revision/tetraquark/8">v8</a>, <a href="https://ncatlab.org/nlab/show/tetraquark">current</a>

   added pointer to today’s:

   • LHCb collaboration, Observation of an exotic narrow doubly charmed tetraquark (arXiv:2109.01038)

   • LHCb collaboration, Study of the doubly charmed tetraquark $T^+_{c c}$ (arXiv:2109.01056)

   diff, v8, current