Double-charm tetraquark

Short description: Type of tetraquark

Double-charm tetraquarkClassification| meson

|

Composition| 2 charm quarks
1 up antiquark
1 down antiquark
Statistics| bosonic
Mass| 3868±124 MeV/c2[1]
mean lifetime| 1.35+0.31
−0.21×10−21 s[1]
electric charge| +1
Spin| 1+[1]
Isospin| 0[2]

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.[3][4][2][5] It contains four quarks: two charm quarks, an anti-up and an anti-down quark.[1]

It has a theoretical computed mass of 3868±124 MeV/c2.[1] The discovery showed an exceptionally strong peak, with 20-sigma significance.[6]

It is hypothesized that studying the behavior of the double-charm tetraquark may play a part in explaining the behavior of the strong force.[7] Following the discovery of the T+cc, researchers now plan experiments to find its double-beauty counterpart Tbb.[8] This tetraquark has been found to have a longer lifespan than most known exotic-matter particles.

## References

1. ↑ 1.0 1.1 1.2 1.3 1.4 Agaev, S.S.; Azizi, K.; Sundu, H. (February 2022). "Newly observed exotic doubly charmed meson Tcc+". Nuclear Physics B 975: 115650. doi:10.1016/j.nuclphysb.2022.115650.
2. ↑ 2.0 2.1 Aaij, R.; Abdelmotteleb, A. S. W.; Abellán Beteta, C.; Abudinen Gallego, F. J.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H. et al. (2022-06-16). "Observation of an exotic narrow doubly charmed tetraquark" (in en). Nature Physics 18 (7): 751–754. doi:10.1038/s41567-022-01614-y. ISSN 1745-2481. Bibcode: 2022NatPh..18..751L. https://www.nature.com/articles/s41567-022-01614-y.
3. ↑ "What to Know About the Newly Discovered Tetraquark at the Large Hadron Collider" (in en-us). 2 August 2021. https://gizmodo.com/what-to-know-about-the-newly-discovered-tetraquark-at-t-1847396650.
4. ↑ "Twice the charm: long-lived exotic particle discovered" (in en). https://home.cern/news/news/physics/twice-charm-long-lived-exotic-particle-discovered.
5. ↑ Aaij, R.; Abdelmotteleb, A. S. W.; Beteta, C. Abellán; Gallego, F. J. Abudinen; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H. et al. (2022-06-16). "Study of the doubly charmed tetraquark T⁺_cc" (in en). Nature Communications 13 (1): 3351. doi:10.1038/s41467-022-30206-w. ISSN 2041-1723. PMID 35710739.
6. ↑ "LHCb experiment spots extraordinary double charmed tetraquark" (in en-US). https://www.nikhef.nl/en/news/lhcb-experiment-spots-extraordinary-double-charmed-tetraquark/.
7. ↑ Wood, Charlie (2021-09-27). "'Impossible' Particle Discovery Adds Key Piece to the Strong Force Puzzle" (in en). https://www.quantamagazine.org/impossible-particle-discovery-adds-key-piece-to-the-strong-force-puzzle-20210927/.
8. ↑ Turner, Ben (2021-08-05). "New 'doubly charming' particle could help unlock the secrets of how matter is built" (in en). https://www.livescience.com/double-charm-tetraquark-found-lhc.html.

## External links

* Observation and study of the doubly charmed Tcc+ tetraquark at LHCb: presentation by Ivan Polyaokov at CERN, 2021-09-14

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