For given I., the 2I+ 1 parameters tr are com-ponents of an irreducible tensor~ of rank I. This
means that under a spatial rotation the tr M obey the same transformation law as the …

The explicit form for the spin projection operators introduced by Fronsdal is calculated for
arbitrary spin and applied to first-order processes involving four fermions. The matrix …

A generalization to all spin magnitudes of the drone-fermion representation (previously
known for spin ½), is presented, and the resulting eigenstates investigated. Linear …

LETTERS To EDITOR the decay of the pion except for the apparent absence of the electron
mode,'and all existing results on strange particle decays (except for the decay of the hyperon …

'(k)-Zk, k—~. An equivalent state-ment is obtained from the vacuum expectation value of the
equal-time commutation relation,([p (x, x,), s, p (y, x,)])= i6 (x—y) Z (2) and the substitution of …

A canonical transformation similar to that given by Foldy and Wouthuysen is obtained for the
spin zero and one theories. For free particles positive and negative charge states are …

small. Increasing W, and W, decreases the mag-nitude of both curves slightly. In fitting the P-
state curve, V, and V, have opposite effects on the ratio of peak heights. Increasing V …

T has been shown'that the wave function+..—= 4'(x~, xs,~ x~) ofa fermion system ofn
identical particles can be written in the form+(*, y)=(.")'Z Cf'"'() g"'(y),(1) where x denotes the p …

'HAT the polarization of a free electron should be defined as the expectation value of the
spin operator e in the I, orentz frame in which the electron is at rest was originally suggested …

1. INTRODUCTION'0 describe a phenomenon correctly and con-veniently, one wants to
represent the states of physical systems by parameters that are logically consistent and also …