Y(4140)

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).

## Contents

* 1 See also
* 2 References
* 3 External links
* 4 Further reading

## See also

* X(3872)
* Zc(3900)
* Z(4430)

## References

1. ↑ "Oddball Particle Surprises Physicists at Fermilab". redOrbit. 19 March 2009. http://www.redorbit.com/news/science/1657139/oddball_particle_surprises_physicists_at_fermilab/index.html.
2. ↑ Handwerk, Brian (20 March 2009). "Strange Particle Created; May Rewrite How Matter's Made". National Geographic News. http://news.nationalgeographic.com/news/2009/03/090320-new-particle.html.
3. ↑ Minard, Anne (18 March 2009). "New Particle Throws Monkeywrench in Particle Physics". Universe Today. http://www.universetoday.com/2009/03/18/new-particle-throws-monkeywrench-in-particle-physics/.
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. doi:10.1016/j.nuclphysa.2013.01.025. Bibcode: 2013NuPhA.914..482H.
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 et al. (2014). "Search for the X(4140) state in B+→J/ψφK+ decays with the D0 detector". Physical Review D 89 (12004): 012004. doi:10.1103/PhysRevD.89.012004. Bibcode: 2014PhRvD..89a2004A.
8. ↑ Shen, C. P. (2010). "Evidence for a New Resonance and Search for the Y(4140) in the γγ→ϕJ/ψ Process". Physical Review Letters 104 (11): 112004. doi:10.1103/PhysRevLett.104.112004. PMID 20366468. Bibcode: 2010PhRvL.104k2004S.
9. ↑ LHCb collaboration; Aaij, R; Adeva, B; Adinolfi, M; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F 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. doi:10.1103/PhysRevLett.118.022003. PMID 28128595. Bibcode: 2017PhRvL.118b2003A.
10. ↑ LHBc collaboration; Aaij, R; Adeva, B; Adinolfi, M; Ajaltouni, Z; Akar, S; Albrecht, J; Alessio, F et al. (2017). "Amplitude analysis of B+→J/ψφK+ decays". Physical Review D 95 (12002): 012002. doi:10.1103/PhysRevD.95.012002. Bibcode: 2017PhRvD..95a2002A.

## External links

* Press release kit for the Y(4140). Contains images of decay modes and resonance data.

## Further reading

* Aaltonen, T. (2009). "Evidence for a Narrow Near-Threshold Structure in the J/ψφ Mass Spectrum B\+ → J/ψφK+ Decays". Physical Review Letters 102 (24): 242002. doi:10.1103/PhysRevLett.102.242002. PMID 19658999. Bibcode: 2009PhRvL.102x2002A.
* Xiang, Liu; Zhu, Shi-Lin (2009). "Y(4143) is probably a molecular partner of Y(3930)". Physical Review D 80 (1): 017502. doi:10.1103/PhysRevD.80.017502. Bibcode: 2009PhRvD..80a7502L.
* Mahajan, Namit (2009). "Y(4140): Possible options". Physics Letters B 679 (3): 228–230. doi:10.1016/j.physletb.2009.07.043. Bibcode: 2009PhLB..679..228M.

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