Y(4140)
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The Y(4140) particle is a previously unpredicted particle 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 not been confirmed by any other experiment. The Belle experiment has searched for this particle but found no evidence for its existence [4]
The Particle Data Group has renamed this particle, to follows its naming conventions to the X(4140).
[edit] References
- ^ "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. Retrieved 2009-03-21.
- ^ 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. Retrieved 2009-03-21.
- ^ 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/.
- ^ Shen et al., C. P. (2010). "Evidence for a New Resonance and Search for the Y(4140) in the γγ→ϕJ/ψ Process". Physical Review Letters 104: 112004. arXiv:0912.2383. Bibcode 2010PhRvL.104k2004S. doi:10.1103/PhysRevLett.104.112004.
[edit] Further reading
- Aaltonen, T.; et al. (2009). "Evidence for a Narrow Near-Threshold Structure in the J/ψφ Mass Spectrum B+ → J/ψφK+ Decays". Physical Review Letters 102: 242002. arXiv:0903.2229. Bibcode 2009PhRvL.102x2002A. doi:10.1103/PhysRevLett.102.242002.
- Xiang, Liu; Zhu, Shi-Lin (2009). "Y(4143) is probably a molecular partner of Y(3930)". Physical Review D 80: 017502. arXiv:0903.2529. Bibcode 2009PhRvD..80a7502L. doi:10.1103/PhysRevD.80.017502.
- Mahajan, Namit (2009). "Y(4140): Possible options". Physics Letters B 679 (3): 228–230. arXiv:0903.3107. Bibcode 2009PhLB..679..228M. doi:10.1016/j.physletb.2009.07.043.
[edit] External links
- Press release kit for the Y(4140). Contains images of decay modes and resonance data.
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