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- W2131489778 abstract "We describe here a method for expressing spinor amplitudes $M=overline{u}({p}^{ensuremath{'}},{s}^{ensuremath{'}})ensuremath{Gamma}ensuremath{mu}(p,s)$ in terms of invariants. The method also provides a simple formula for the square of $M$ summed on spins. When $ensuremath{Gamma}$ contains more than five terms or has more than two $ensuremath{gamma}$-matrices per term this formula involves the evaluation of fewer and shorter traces than the usual trace technique. Thus this should be a useful computational device for calculating cross sections. The methods presented here are independent of the spinor representation, but can be easily specialized to the important helicity case. A number of other possible applications of the amplitude formula are also briefly discussed." @default.
- W2131489778 created "2016-06-24" @default.
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- W2131489778 date "1972-07-15" @default.
- W2131489778 modified "2023-10-18" @default.
- W2131489778 title "Method for Expressing Dirac Spinor Amplitudes in Terms of Invariants and Application to the Calculation of Cross Sections" @default.
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- W2131489778 doi "https://doi.org/10.1103/physrevd.6.471" @default.
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