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In particle physics, proton decay is a hypothetical form of particle decay in which the proton decays into lighter subatomic particles, such as a neutral pion and a positron. [1] The proton decay hypothesis was first formulated by Andrei Sakharov in 1967. Despite significant experimental effort, proton decay has never been observed.
In the expanded Harari–Seiberg version the rishons possess color and hypercolor, explaining why the only composites are the observed quarks and leptons. [3] Under certain assumptions, it is possible to show that the model allows exactly for three generations of quarks and leptons.
In addition to Standard Model particles, the theory includes 30 colored X bosons, responsible for proton decay, and two W' bosons. The pattern of charges for particles in the SO(10) model, rotated to show the embedding in E6. In particle physics, SO(10) refers to a grand unified theory (GUT) based on the spin group Spin(10).
Created Date: 8/30/2012 4:52:52 PM
IMB detected fast-moving particles such as those produced by proton decay or neutrino interactions by picking up the Cherenkov radiation generated when such a particle moves faster than light's speed in water. Since directional information was available from the phototubes, IMB was able to estimate the initial direction of neutrinos.
One may integrate over the phase space to obtain the total decay rate for the specified final state. If a particle has multiple decay branches or modes with different final states, its full decay rate is obtained by summing the decay rates for all branches. The branching ratio for each mode is given by its decay rate divided by the full decay rate.
In physics, the Pati–Salam model is a Grand Unified Theory (GUT) proposed in 1974 by Abdus Salam and Jogesh Pati.Like other GUTs, its goal is to explain the seeming arbitrariness and complexity of the Standard Model in terms of a simpler, more fundamental theory that unifies what are in the Standard Model disparate particles and forces.
Proton emission (also known as proton radioactivity) is a rare type of radioactive decay in which a proton is ejected from a nucleus.Proton emission can occur from high-lying excited states in a nucleus following a beta decay, in which case the process is known as beta-delayed proton emission, or can occur from the ground state (or a low-lying isomer) of very proton-rich nuclei, in which case ...