Tuesday, 22 August 2017

particle physics - What's the symbol for the antiparticle of the Delta+ baryon?


It can't be Δ since that is another particle also made up of quarks (not antiquarks). I can think of four possibilities:



  1. ¯Δ+

  2. ¯Δ+

  3. ¯Δ

  4. ¯Δ



I am sure someone has asked a similar question, but I failed at searching for it.



Answer



The Δ is a quartet of particles with isospin 3/2: Δ,Δ0,Δ+,Δ++

I would expect the anti-Δ to be written ˉΔ, with the four isospin projections ˉΔ,ˉΔ,ˉΔ0,ˉΔ+
In this case the antiparticle of the Δ+ would be the ˉΔ.


If you'd like a canonical reference, look for a paper about pion production with antiproton beams. Note that there's a whole spectrum of Δ resonances, not just the lightest one at 1232 MeV.


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