Double-charm_tetraquark References

Double-charm tetraquark
Classification	meson
Composition	2 charm quarks; 1 up antiquark; 1 down antiquark
Statistics	bosonic
Family	hadron
Mass	3868±124 MeV/c2
Mean lifetime	1.35+0.31; −0.21×10−21 s
Electric charge	+1
Spin	1+
Isospin	0

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 T_bb.^[8] This tetraquark has been found to have a longer lifespan than most known exotic-matter particles.

References

^ ^a ^b ^c ^d ^e Agaev, S.S.; Azizi, K.; Sundu, H. (February 2022). "Newly observed exotic doubly charmed meson $T_{cc}^{+}$ ". Nuclear Physics B. 975: 115650. arXiv: 2108.00188. doi: 10.1016/j.nuclphysb.2022.115650. S2CID 236772263.
^ ^a ^b Aaij, R.; Abdelmotteleb, A. S. W.; Abellán Beteta, C.; Abudinen Gallego, F. J.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C. A.; Aiola, S. (2022-06-16). "Observation of an exotic narrow doubly charmed tetraquark". Nature Physics. 18 (7): 751–754. arXiv: 2109.01038. Bibcode: 2022NatPh..18..751L. doi: 10.1038/s41567-022-01614-y. ISSN 1745-2481. S2CID 237385202.
^ "What to Know About the Newly Discovered Tetraquark at the Large Hadron Collider". Gizmodo. 2 August 2021. Retrieved 2021-09-27.
^ "Twice the charm: long-lived exotic particle discovered". CERN. Retrieved 2021-09-29.
^ Aaij, R.; Abdelmotteleb, A. S. W.; Beteta, C. Abellán; Gallego, F. J. Abudinen; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C. A.; Aiola, S. (2022-06-16). "Study of the doubly charmed tetraquark T⁺_cc". Nature Communications. 13 (1): 3351. doi: 10.1038/s41467-022-30206-w. ISSN 2041-1723. PMC 9203551. PMID 35710739.
^ "LHCb experiment spots extraordinary double charmed tetraquark". Nikhef. Retrieved 2021-09-27.
^ Wood, Charlie (2021-09-27). "'Impossible' Particle Discovery Adds Key Piece to the Strong Force Puzzle". Quanta Magazine. Retrieved 2021-09-27.
^ 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.

External links

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

This particle physics–related article is a stub. You can help Wikipedia by expanding it.

[Agaev2021-1] Agaev, S.S.; Azizi, K.; Sundu, H. (February 2022). "Newly observed exotic doubly charmed meson $T_{cc}^{+}$ ". Nuclear Physics B. 975: 115650. arXiv: 2108.00188. doi: 10.1016/j.nuclphysb.2022.115650. S2CID 236772263.

[naturephys-2] Aaij, R.; Abdelmotteleb, A. S. W.; Abellán Beteta, C.; Abudinen Gallego, F. J.; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C. A.; Aiola, S. (2022-06-16). "Observation of an exotic narrow doubly charmed tetraquark". Nature Physics. 18 (7): 751–754. arXiv: 2109.01038. Bibcode: 2022NatPh..18..751L. doi: 10.1038/s41567-022-01614-y. ISSN 1745-2481. S2CID 237385202.

[3] "What to Know About the Newly Discovered Tetraquark at the Large Hadron Collider". Gizmodo. 2 August 2021. Retrieved 2021-09-27.

[4] "Twice the charm: long-lived exotic particle discovered". CERN. Retrieved 2021-09-29.

[5] Aaij, R.; Abdelmotteleb, A. S. W.; Beteta, C. Abellán; Gallego, F. J. Abudinen; Ackernley, T.; Adeva, B.; Adinolfi, M.; Afsharnia, H.; Agapopoulou, C.; Aidala, C. A.; Aiola, S. (2022-06-16). "Study of the doubly charmed tetraquark T⁺_cc". Nature Communications. 13 (1): 3351. doi: 10.1038/s41467-022-30206-w. ISSN 2041-1723. PMC 9203551. PMID 35710739.

[6] "LHCb experiment spots extraordinary double charmed tetraquark". Nikhef. Retrieved 2021-09-27.

[7] Wood, Charlie (2021-09-27). "'Impossible' Particle Discovery Adds Key Piece to the Strong Force Puzzle". Quanta Magazine. Retrieved 2021-09-27.

[8] 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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