Why do we never observe the decay of this particle?

  • Thread starter Thread starter oosgood
  • Start date Start date
  • Tags Tags
    Decay Particle
oosgood
Messages
7
Reaction score
0
Hey why do we observe the Ʃ(minus) decay into n+e+anti-e-neutrino?But never

Ʃ+--->n + positron+ ve( electron neutrino)
 
Physics news on Phys.org
First (although the notation is confusing) Ʃ^{+} and Ʃ^{-} are not a particle-antiparticle pair, they are patners in an isospin triplet. So there is no reason that the two decays should be related. Ʃ^{+} is composed of suu and it would two W exchanges (netral vector bosons don't mix flavour), while Ʃ^{-} is composed of sdd which requires only one W exchange.
 
Thread 'Why is there such a difference between the total cross-section data? (simulation vs. experiment)'

Thread 'Why is there such a difference between the total cross-section data? (simulation vs. experiment)'

Well, I'm simulating a neutron-proton scattering phase shift. The equation that I solve numerically is the Phase function method and is $$ \frac{d}{dr}[\delta_{i+1}] = \frac{2\mu}{\hbar^2}\frac{V(r)}{k^2}\sin(kr + \delta_i)$$ ##\delta_i## is the phase shift for triplet and singlet state, ##\mu## is the reduced mass for neutron-proton, ##k=\sqrt{2\mu E_{cm}/\hbar^2}## is the wave number and ##V(r)## is the potential of interaction like Yukawa, Wood-Saxon, Square well potential, etc. I first...
View full post »

Thread 'Toponium Discovered'

Toponium is a hadron which is the bound state of a valance top quark and a valance antitop quark. Oversimplified presentations often state that top quarks don't form hadrons, because they decay to bottom quarks extremely rapidly after they are created, leaving no time to form a hadron. And, the vast majority of the time, this is true. But, the lifetime of a top quark is only an average lifetime. Sometimes it decays faster and sometimes it decays slower. In the highly improbable case that...
View full post »

Thread 'Dirac-Delta from Normalization of Continuous Eigenfunctions'

I'm following this paper by Kitaev on SL(2,R) representations and I'm having a problem in the normalization of the continuous eigenfunctions (eqs. (67)-(70)), which satisfy \langle f_s | f_{s'} \rangle = \int_{0}^{1} \frac{2}{(1-u)^2} f_s(u)^* f_{s'}(u) \, du. \tag{67} The singular contribution of the integral arises at the endpoint u=1 of the integral, and in the limit u \to 1, the function f_s(u) takes on the form f_s(u) \approx a_s (1-u)^{1/2 + i s} + a_s^* (1-u)^{1/2 - i s}. \tag{70}...
View full post »

Similar threads

A Beta Decay, why did they have to resort to Neutrinos?
Replies
32
Views
4K
B CERN Experiment NA62 observes rare Kaon decay mode
Replies
7
Views
3K
B Beta Plus Decay: What's Left for the Electron?
Replies
8
Views
2K
I Why Can a W Boson Decay into Quarks of Different Generations?
Replies
1
Views
3K
I How Does Beta Decay Relate to the Role of W Bosons in Weak Nuclear Force?
Replies
4
Views
4K
I How often would a ϕ meson decay to a electron-positron pair?
Replies
2
Views
2K
I Question on Baryons and Specific Decays
Replies
9
Views
2K
I Observing Proton Decay & Antineutrinos
Replies
8
Views
2K
I Understanding crossing symmetry: inverse beta decay
Replies
4
Views
2K
I Positron decay direction from muon
Replies
3
Views
2K

Hot Threads

Recent Insights

Back
Top