Supersymmetry and Future Colliders

TL;DR

This paper reviews precision studies of supersymmetry at LHC and future linear colliders, focusing on decay processes, mass measurements, and model-independent constraints on supersymmetric particles.

Contribution

It introduces new methods for constraining neutralino and slepton masses using decay distributions and asymmetries at colliders, enhancing SUSY parameter determination.

Findings

Decay distributions constrain ino mixing and slepton masses.

Asymmetry peaks provide model-independent mass information.

High-precision measurements at LC can determine sparticle couplings and squark mass scales.

Abstract

In this talk, I review precision SUSY study at LHC and TeV scale e+e- linear colliders (LC). We discuss the study of the 3 body decay of the second lightest neutralino \chi^0_2--> \chi^0_1 ll or the 2 body decay \chi^0_2-->\tilde{l}l at LHC. In the former case, the whole m_{ll} distribution observed at LHC would constrain ino mixing and slepton masses. On the other hand, when \tilde{l}l decay is open, the distribution of the asymmetry of the transverse momentum of lepton pair A_T= p_{T1}/p_{T2} peaks at A_E=p_{1}/p_{2} in \chi^0_2 rest frame for m_{ll} << m^{max}_{ll} samples, providing another model independent information. The peak position and the edge of the m_{ll} distribution constrain m_{\chi^0_2}, m_{\chi}^0_1} and m_{\tilde{l}}. Slepton mass universality may be checked within a few % in the early stage of the experiment. Finally I discuss the physics at TeVscale LC. The mass and couplings of sparticles will be measured withinO(1%) error, and measurement of the radiative correction to the ino-slepton-lepton coupling will determine the first generation squark mass scale even in decoupling scenarios.