Impact of e(+) and e(-) beam polarization on chargino and neutralino production at a linear collider

We study the production processes e(+)e(-) --> <(<chi>)over tilde>(+)(i)<(< chi>)over tilde>(-)(j); i, j = 1, 2, and e(+)e(-) --> <(<chi>)over tilde>(0 )(m)<(<chi>)over tilde>(0)(n),m, n = 1,...,4, working out the advantages of polarizing both beams. For e(+)e(-) --> <(<chi>)over tilde>(+)(1)<(<chi>)o ver tilde>(-)(1) with <(<chi>)over tilde>(-)(1) --> <(<chi>)over tilde>(0)( 1)e(-)<(<nu>)over bar> and e(+)e(-) --> <(<chi>)over tilde>(0)(1)<(<chi>)ov er tilde>(0)(2) with <(<chi>)over tilde>(0)(2) --> <(<chi>)over tilde>(0)(1 )e(+)e(-) we perform a detailed analysis, including the complete spin corre lations between production and decay. We analyze the forward-backward asymm etry of the decay electron for various beam polarizations. We also study po larization asymmetries in e(+)e(-) --> <(<chi>)over tilde>(0)(1)<(<chi>)ove r tilde>(0)(2). These asymmetries strongly constrain the gaugino parameter M-1 and the masses m((e) over tildeL), m((e) over tildeR), m(<(<nu>)over ti lde>) also if m((e) over tilde,<(<nu>)over tilde>) greater than or equal to s(1/2)/2. We give numerical predictions for three scenarios for a linear c ollider with s(1/2) = 500-1000 GeV.