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Y(4140)

From Wikipedia, the free encyclopedia

The Y(4140) particle is an electrically neutral exotic hadron candidate that is about 4.4 times heavier than the proton. It was observed at Fermilab and announced on 17 March 2009.[1] This particle is extremely rare and was detected in only 20 of billions of collisions.[2]

Since it decays into J/ψ and φ mesons, it has been suggested that this particle is composed of charm quarks and charm antiquarks, possibly even a four quark combination.[3] The existence of the particle has been confirmed by members of the CMS collaboration at the Large Hadron Collider on November 14, 2012[4][5] and by the DØ experiment at the Tevatron on September 25, 2013.[6][7] The Belle experiment[8] has searched for this particle but found no evidence for its existence. The LHCb experiment observes a peak at the same position in the J/ψϕ invariant mass, but it is best described as a Ds±Ds∗∓ cusp, and is much broader than the previous measurements of the Y(4140).[9][10]

The Particle Data Group has renamed Y(4140) to follow naming conventions to X(4140).

See also

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References

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  1. ^ "Oddball Particle Surprises Physicists at Fermilab". redOrbit. 19 March 2009. Retrieved 2009-03-21.
  2. ^ Handwerk, Brian (20 March 2009). "Strange Particle Created; May Rewrite How Matter's Made". National Geographic News. Archived from the original on March 22, 2009. Retrieved 2009-03-21.
  3. ^ Minard, Anne (18 March 2009). "New Particle Throws Monkeywrench in Particle Physics". Universe Today.
  4. ^ Riesselmann, Kurt (December 4, 2012). "Experiment confirms existence of odd particle". Phys.Org.
  5. ^ Hidalgo-Duque, C; Nieves, J; Pavón Valderrama, M (2012). "Heavy Quark Spin Symmetry and SU(3)-Flavour Partners of the X(3872)". Nuclear Physics A. 914: 482–487. arXiv:1211.7004. Bibcode:2013NuPhA.914..482H. doi:10.1016/j.nuclphysa.2013.01.025. S2CID 53549773.
  6. ^ Dorigo, Tommaso (September 26, 2013). "DZERO Confirms The Y(4140) And Its Excitation"
  7. ^ D0 Collaboration; Abbott, B; Acharya, B. S; Adams, M; Adams, T; Agnew, J. P; Alexeev, G. D; Alkhazov, G; Alton, A; Askew, A; Atkins, S; Augsten, K; Avila, C; Badaud, F; Bagby, L; Baldin, B; Bandurin, D. V; Banerjee, S; Barberis, E; Baringer, P; Bartlett, J. F; Bassler, U; Bazterra, V; Bean, A; Begalli, M; Bellantoni, L; Beri, S. B; Bernardi, G; Bernhard, R; et al. (2014). "Search for the X(4140) state in B+→J/ψφK+ decays with the D0 detector". Physical Review D. 89 (12004): 012004. arXiv:1309.6580. Bibcode:2014PhRvD..89a2004A. doi:10.1103/PhysRevD.89.012004. S2CID 119226762.{{cite journal}}: CS1 maint: numeric names: authors list (link)
  8. ^ Shen, C. P.; et al. (2010). "Evidence for a New Resonance and Search for the Y(4140) in the γγ→ϕJ/ψ Process". Physical Review Letters. 104 (11): 112004. arXiv:0912.2383. Bibcode:2010PhRvL.104k2004S. doi:10.1103/PhysRevLett.104.112004. PMID 20366468. S2CID 31594166.
  9. ^ LHCb collaboration; Aaij, R; Adeva, B; Adinolfi, M; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves Jr, A. A; Amato, S; Amerio, S; Amhis, Y; An, L; Anderlini, L; Andreassi, G; Andreotti, M; Andrews, J. E; Appleby, R. B; Aquines Gutierrez, O; Archilli, F; d'Argent, P; Arnau Romeu, J; Artamonov, A; Artuso, M; Aslanides, E; et al. (2017). "Observation of J/ψφ structures consistent with exotic states from amplitude analysis of B+→J/ψφK+ decays". Physical Review Letters. 118 (2): 022003. arXiv:1606.07895. Bibcode:2017PhRvL.118b2003A. doi:10.1103/PhysRevLett.118.022003. PMID 28128595. S2CID 206284149.
  10. ^ LHBc collaboration; Aaij, R; Adeva, B; Adinolfi, M; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F; Alexander, M; Ali, S; Alkhazov, G; Alvarez Cartelle, P; Alves Jr, A. A; Amato, S; Amerio, S; Amhis, Y; An, L; Anderlini, L; Andreassi, G; Andreotti, M; Andrews, J. E; Appleby, R. B; Aquines Gutierrez, O; Archilli, F; d'Argent, P; Arnau Romeu, J; Artamonov, A; Artuso, M; Aslanides, E; et al. (2017). "Amplitude analysis of B+→J/ψφK+ decays". Physical Review D. 95 (12002): 012002. arXiv:1606.07898. Bibcode:2017PhRvD..95a2002A. doi:10.1103/PhysRevD.95.012002. S2CID 73689011.
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Further reading

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