Double-charm tetraquark

The double-charm tetraquark (T+
cc, ccud) is a type of long-lived tetraquark that was discovered in 2021 in the LHCb experiment conducted at the Large Hadron Collider.[1][2][3] It contains four quarks: two charm quarks, an anti-up and an anti-down quark.[2]

Double-charm tetraquark
Classificationmeson
Composition2 charm quarks
1 up antiquark
1 down antiquark
Statisticsbosonic
Familyhadron

It has a theoretical computed mass of 3868±124 MeV/c2.[2] The discovery showed an exceptionally strong peak, with 20-sigma significance.[4]

It is hypothesized that studying the behavior of the double-charm tetraquark may play a part in explaining the behavior of the strong force.[5] Following the discovery of the T+
cc, researchers now plan experiments to find its double-beauty counterpart Tbb.[6] This tetraquark has been found to have a longer lifespan than most known exotic-matter particles.

References
  1. "What to Know About the Newly Discovered Tetraquark at the Large Hadron Collider". Gizmodo. Retrieved 2021-09-27.
  2. Agaev, S. S.; Azizi, K.; Sundu, H. (2021-08-12). "Newly observed exotic doubly charmed meson T+
    cc    ". arXiv:2108.00188 [hep-ph].
  3. "Twice the charm: long-lived exotic particle discovered". CERN. Retrieved 2021-09-29.
  4. "LHCb experiment spots extraordinary double charmed tetraquark". Nikhef. Retrieved 2021-09-27.
  5. Wood, Charlie (2021-09-27). "'Impossible' Particle Discovery Adds Key Piece to the Strong Force Puzzle". Quanta Magazine. Retrieved 2021-09-27.
  6. Turner, Ben (2021-08-05). "New 'doubly charming' particle could help unlock the secrets of how matter is built". livescience.com. Retrieved 2021-09-27.


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