Measuring SUSY parameters at CERN LEP II using chargino production and decay

Journal Article · Sat Feb 01 04:00:00 EST 1997 · Physical Review, D

DOI:https://doi.org/10.1103/PhysRevD.55.1326· OSTI ID:450541

Feng, J L ^[1]; Strassler, M J ^[2]

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1. Theoretical Physics Group, Lawrence Berkeley National Laboratory and Department of Physics, University of California, Berkeley, California 94720 (United States)
2. Department of Physics and Astronomy, Rutgers University, Piscataway, New Jersey 08855 (United States)

Previously, in the context of the minimal supersymmetric standard model (without {ital a priori} assumptions of parameter unification), we studied the constraints on weak-scale SUSY parameters from chargino production at CERN LEP II, using as observables m{sub {tilde {chi}}{sub 1}{sup {plus_minus}}},m{sub {tilde {chi}}{sub 1}{sup 0}}, the cross section and the leptonic branching fraction. Here, exploiting the high degree of polarization in chargino production, we add to our earlier work the forward-backward asymmetries of the visible hadrons and leptons in chargino decays. For a chargino that is mostly gaugino, the parameter space can now be restricted to a small region; tan{beta} is constrained, the soft electroweak gaugino and electron sneutrino masses are determined to about 10{percent}, and the sign of {mu} may be determined. Constraints for a chargino that is mostly Higgsino are much weaker, but still disfavor the hypothesis that the chargino is mostly gaugino. For a chargino which is a roughly equal mixture of Higgsino and gaugino, we find intermediate results. {copyright} {ital 1997} {ital The American Physical Society}

• Research Organization: Lawrence Berkeley National Laboratory
• DOE Contract Number: AC03-76SF00098; FG05-90ER40559
• OSTI ID: 450541
• Journal Information: Physical Review, D, Journal Name: Physical Review, D Journal Issue: 3 Vol. 55; ISSN PRVDAQ; ISSN 0556-2821
• Country of Publication: United States
• Language: English

Related Subjects

66 PHYSICS
BRANCHING RATIO
CROSS SECTIONS
HIGGS BOSONS
MASS
NEUTRINOS
PARTICLE DECAY
PARTICLE PRODUCTION
POLARIZATION
SPARTICLES
STANDARD MODEL
SUPERSYMMETRY
WEAK PARTICLE DECAY