Physics – High Energy Physics – High Energy Physics - Phenomenology
Scientific paper
1998-10-28
Int.J.Mod.Phys. A14 (1999) 5075-5092
Physics
High Energy Physics
High Energy Physics - Phenomenology
23 pages, 7 figures, 6 tables; added reference for section 1
Scientific paper
10.1142/S0217751X99002396
A possibility to measure the spin and spin-spin correlations of a chargino pair is investigated in the process electron positron -> chargino_1 anti-chargino_1 -> (neutralino_1 quark anti-quark) (neutralino_1 quark anti-quark) at future linear-collider energies. The total and the differential cross sections are calculated by the GRACE system which allows for the full spin correlation. Experimental sensitivity of the measurements are examined by assuming the limited detector resolution, the initial state radiation and the beam-beam effect (beamstrahlung). It is found that generally the spin-spin correlation can only be measured with a lower sensitivity than the chargino spin itself. The dependence of the correlation measurements on the relevant SUSY parameters can be seen for a light sneutrino case, but the situation becomes worse for a heavier sneutrino.
Ishikawa Tadashi
Kaneko Tak
Kon Tadashi
Kurihara Yoshimasa
Lafage V.
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