The Y(4140) particle is a previously unpredicted particle observed at Fermilab and announced on 17 March, 2009.[1]
It was named after its mass of 4143.0 ± 2.9 ± 1.2 MeV/c2.
This particle is extremely rare and was detected in only 20 of billions of collisions.[2]
Because 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 missing rest mass from the decay is only about 27.0 ± 2.9 ± 1.2 MeV/c2.[dubious ][citation needed]
References
- ^ "Oddball Particle Surprises Physicists at Fermilab". redOrbit. 2009. http://www.redorbit.com/news/science/1657139/oddball_particle_surprises_physicists_at_fermilab/index.html. Retrieved 2009-03-21.
- ^ Handwerk, Brian (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 (March 18, 2009). "New Particle Throws Monkeywrench in Particle Physics". Universe Today. http://www.universetoday.com/2009/03/18/new-particle-throws-monkeywrench-in-particle-physics/.
Further reading
- Xiang, Liu; Shi-Lin, Zhu (2009). "Y(4143) is probably a molecular partner of Y(3930)". arΧiv:0903.2529 [hep-ph].
- Mahajan, Namit (2009). "Y(4140): Possible options". arΧiv:0903.3107 [hep-ph].
External links
- Press release kit for the Y(4140). Contains images of decay modes and resonance data.
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