What’s The Omega_b Mass? LHCb Confirms CDF, DZERO Way Off

By Tommaso Dorigo | February 7th 2013 07:26 AM

The Omega_b particle is a quite peculiar baryon, made up by three heavy quarks: a b-quark, and two s-quarks. Because of this composition, where only down-type quarks appear, the phenomenology of the decay of this particle is really spectacular: both the b-quark and the strange quarks take quite some time to decay, and as they take shifts to do it the Omega_b first transmutes into a Omega (a particle made up by three s-quarks!), then into a Lambda, and finally into a proton.

Each of these decays generates a reconstructable decay point, so one can reconstruct the whole chain perfectly. A sketch will clarify matters – see below.

Read more: What's The Omega_b Mass? LHCb Confirms CDF, DZERO Way Off — Science 2.0.

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