Probing Slepton Mass Non-Universality at e^+e^- Linear Colliders

• Main Authors: Baer, Howard, Balazs, Csaba, Hesselbach, Stefan, Mizukoshi, J. Kenichi, Tata, Xerxes
• Format: Journal Article
• Language: English
• Published: 15-12-2000
• Subjects: Physics - High Energy Physics - Phenomenology
• DOI: 10.48550/arxiv.hep-ph/0012205

Phys.Rev. D63 (2001) 095008 There are many models with non-universal soft SUSY breaking sfermion mass
parameters at the grand unification scale. Even in the mSUGRA model scalar mass
unification might occur at a scale closer to M_Planck, and renormalization
effects would cause a mass splitting at M_GUT. We identify an experimentally
measurable quantity Delta that correlates strongly with delta m^2 =
m^2_{selectron_R}(M_GUT) - m^2_{selectron_L}(M_GUT), and which can be measured
at electron-positron colliders provided both selectrons and the chargino are
kinematically accessible. We show that if these sparticle masses can be
measured with a precision of 1% at a 500 GeV linear collider, the resulting
precision in the determination of Delta may allow experiments to distinguish
between scalar mass unification at the GUT scale from the corresponding
unification at Q ~ M_Planck. Experimental determination of Delta would also
provide a distinction between the mSUGRA model and the recently proposed
gaugino-mediation model. Moreover, a measurement of Delta (or a related
quantity Delta') would allow for a direct determination of delta m^2.