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  2. Automatic calculation of particle interaction or decay

    en.wikipedia.org/wiki/Automatic_calculation_of...

    The automatic calculation of particle interaction or decay is part of the computational particle physics branch. It refers to computing tools that help calculating the complex particle interactions as studied in high-energy physics, astroparticle physics and cosmology.

  3. Helicity (particle physics) - Wikipedia

    en.wikipedia.org/wiki/Helicity_(particle_physics)

    For a massive particle of spin S, the eigenvalues of helicity are S, S − 1, S − 2, ..., − S. [ 3 ] : 12 For massless particles, not all of spin eigenvalues correspond to physically meaningful degrees of freedom: For example, the photon is a massless spin 1 particle with helicity eigenvalues −1 and +1, but the eigenvalue 0 is not ...

  4. Hydrodynamical helicity - Wikipedia

    en.wikipedia.org/wiki/Hydrodynamical_helicity

    Helicity is a pseudo-scalar quantity: it changes sign under change from a right-handed to a left-handed frame of reference; it can be considered as a measure of the handedness (or chirality) of the flow. Helicity is one of the four known integral invariants of the Euler equations; the other three are energy, momentum and angular momentum.

  5. MHV amplitudes - Wikipedia

    en.wikipedia.org/wiki/MHV_Amplitudes

    These amplitudes are called MHV amplitudes, because at tree level, they violate helicity conservation to the maximum extent possible. The tree amplitudes in which all gauge bosons have the same helicity or all but one have the same helicity vanish. MHV amplitudes may be calculated very efficiently by means of the Parke–Taylor formula.

  6. Magnetic helicity - Wikipedia

    en.wikipedia.org/wiki/Magnetic_helicity

    Magnetic helicity is a gauge-dependent quantity, because can be redefined by adding a gradient to it (gauge choosing).However, for perfectly conducting boundaries or periodic systems without a net magnetic flux, the magnetic helicity contained in the whole domain is gauge invariant, [15] that is, independent of the gauge choice.

  7. Helicity basis - Wikipedia

    en.wikipedia.org/wiki/Helicity_basis

    The two-component helicity eigenstates satisfy ^ (^) = (^) where are the Pauli matrices, ^ is the direction of the fermion momentum, = depending on whether spin is pointing in the same direction as ^ or opposite.

  8. Woltjer's theorem - Wikipedia

    en.wikipedia.org/wiki/Woltjer's_theorem

    In plasma physics, Woltjer's theorem states that force-free magnetic fields in a closed system with constant force-free parameter represent the state with lowest magnetic energy in the system and that the magnetic helicity is invariant under this condition.

  9. Gauge boson - Wikipedia

    en.wikipedia.org/wiki/Gauge_boson

    [1] [2] Elementary particles whose interactions are described by a gauge theory interact with each other by the exchange of gauge bosons, usually as virtual particles. Photons, W and Z bosons, and gluons are gauge bosons. All known gauge bosons have a spin of 1; for comparison, the Higgs boson has spin zero and the hypothetical graviton has

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