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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).

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ReferencesEdit

  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. 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.
  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. (2013). "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.
  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.
  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. (2016). "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.
  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. (2016). "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.

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