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Encyclopedia > Xi particle

In particle physics, Ξ (Xi) is a name given to a range of baryons with one up or down quark and two heavier quarks. They are sometimes called the cascade particles because of their unstable state, they decay rapidly into lighter particles through a chain of decays. The first discovery of the Xi particle was at Brookhaven National Laboratory in 1964.[1] Thousands of particles explode from the collision point of two relativistic (100 GeV per nucleon) gold ions in the STAR detector of the Relativistic Heavy Ion Collider. ... In particle physics, the baryons are a family of subatomic particles including the proton and the neutron (collectively called Greek barys, meaning heavy, as they are heavier than the other main groups of particles. ... These are the 6 quarks and their most likely decay modes. ...

Xi particle
Particle Symbol Makeup Rest mass
MeV/c2
S C B Mean lifetime
s
Main decay
channel
Xi Ξ0 uss 1315 -2 0 0 2.9×10-10 Λ0 + π0
Xi Ξ- dss 1321 -2 0 0 1.6×10-10 Λ0 + π-
charmed Xi Ξ+c usc 2466 -1 +1 0 4.4×10-13
charmed Xi Ξ0c dsc 2472 -1 +1 0 1.1×10-13

The term mass in special relativity is used in a couple of different ways, occasionally leading to a great deal of confusion. ... An electronvolt (symbol: eV) is the amount of energy gained by a single unbound electron when it falls through an electrostatic potential difference of one volt. ... The speed of light in a vacuum is an important physical constant denoted by the letter c for constant or the Latin word celeritas meaning swiftness. It is the speed of all electromagnetic radiation in a vacuum, not just visible light. ... In particle physics, strangeness is the number of anti-strange quarks minus the number of strange quarks in a particle. ... Charm is the number of charm quarks (c) minus the number of charm anti-quarks () that are present in a particle: This makes charm quark to have a charm of +1 and anti-charm quark to have a charm of −1 (the charm sign agreeing with the quark charge... In Physics, Bottomness (also formerly called Beauty) quantum number is the number of bottom anti-quarks () minus the number of bottom quarks (b) that are present in a particle: Bottom quarks have a bottomness of −1 and bottom anti-quarks of +1, so the bottomness sign agrees with its... Given an assembly of elements, the number of which decreases ultimately to zero, the lifetime (also called the mean lifetime) is a certain number that characterizes the rate of reduction (decay) of the assembly. ... This article is about the unit of time. ... Ξ (Xi) is a name given to a range of particles with one up or down quark and two heavier quarks. ... Ξ (Xi) is a name given to a range of particles with one up or down quark and two heavier quarks. ... Ξ (Xi) is a name given to a range of particles with one up or down quark and two heavier quarks. ... Ξ (Xi) is a name given to a range of particles with one up or down quark and two heavier quarks. ...

References

  1. ^ http://hyperphysics.phy-astr.gsu.edu/hbase/particles/xi.html

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