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BB1974
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Why does the eta prime meson have such a narrow decay width (ie long lifetime) compared to the rho and omega mesons? Is there some conservation rule that supresses its decays?
Indeed it is very interesting so substract the strong decay and to study the anomaly-mediated decay of eta' in the same way than eta and pion.Meir Achuz said:but the phase space is small, limiting the rate.
Generically, when one finds than am allowed strong decay is, er, strongly supressed then the first suspect is OZI rule, which "roughly" asks some of the initial quark content of the decaying particle to survive in the decaying products.Meir Achuz said:Is there some conservation rule that supresses its decays?
arivero said:Indeed it is very interesting so substract the strong decay and to study the anomaly-mediated decay of eta' in the same way than eta and pion.
Indees that is the way to go I'd wish OZI suppression were more deeply understood, but the limitations of perturbative calculations for SU(3) are an slap in the face.BB1974 said:Thanks everyone. I attempted to explain that the eta' lasts about 40 times as long as the omega with a combination of OZI and phase-space arguments.
the stuff on the Z0 is actually unpublished because you should ask for a low energy GUT model to explain it, and such beast plainly does not exist. The stuff on J/Psi could eventually be proved, it amounts to say that all the total sum of allowed decays is "dual" to the decay via the forbidden channel. But nobody tries dualities in electroweak theory, so it will stay in the limbo too. Reduced decay widhts are actually used in some works, but for energies more or less in the same range. I am not sure if one should refine the definition by considering the running of the coupling constants (hard to do, if you only want to use experimental data, theory-independent)A lot of the stuff you guys brought up is really beyond the scope of what we've learned so far.
The Eta Prime Meson, also known as the Eta' or Eta-prime, is a subatomic particle that belongs to the meson family. It is a type of hadron, meaning it is composed of quarks and anti-quarks. Its mass is approximately 958.2 MeV/c².
Narrow decay width refers to the fact that the Eta Prime Meson has a relatively small range of possible decay modes. This is due to the conservation rules of the strong interaction, which limit the possible combinations of quarks and anti-quarks that can make up the meson.
The Eta Prime Meson is composed of an up quark, anti-down quark, and strange quark. The conservation of charge and strangeness in strong interactions means that these quarks must be conserved in any decay process. This limits the possible decay modes of the Eta Prime Meson, resulting in its narrow decay width.
The Eta Prime Meson is important in the study of strong interactions because it is a unique particle that can help us understand the dynamics of the strong force. Its properties, such as its narrow decay width, provide valuable information about the behavior of quarks and their interactions.
The Eta Prime Meson can be produced in experiments by colliding high-energy particles, such as protons, with a target material. This collision results in the creation of new particles, including the Eta Prime Meson, which can then be detected and studied by scientists.