Non-universal scalar masses: a signal-based analysis for the Large Hadron Collider

TL;DR

This paper investigates how non-universal scalar masses in supersymmetry could produce distinctive signals at the LHC, using a multichannel event rate ratio analysis to differentiate from universal scenarios.

Contribution

It introduces a multichannel ratio-based analysis method to identify non-universal scalar mass patterns in supersymmetry at the LHC, extending previous gaugino non-universality studies.

Findings

Distinctive spectral features identified for different non-universality cases.

Trilepton channels are particularly effective for distinguishing non-universal scalar masses.

Event rate ratios can differentiate non-universal scenarios from minimal supergravity models.

Abstract

We study the possible signatures of non-universal scalar masses in supersymmetry at the Large Hadron Collider (LHC). This is done, following our recent study on gaugino non-universality, via a multichannel analysis, based largely on the ratios of event rates for different final states, aimed at minimizing irregularity in the pattern due to extraneous effects and errors. We have studied (a) squark-slepton non-universality, (b) non-universality in sfermion masses of the third family, (c) the effects of $SO(10) D$-terms in supersymmetric Grand Unified Theories. After presenting an elaborate numerical analysis of like- and opposite-sign dileptons, inclusive and hadronically quiet trileptons as well as inclusive jet final states, we point out specific features of the spectrum in each case, which can be differentiated in the above channels from the spectrum for a minimal supergravity scenario with a universal scalar mass at high scale. The event selection criteria, and the situations where the signals are sizable enough for a comparatve study, are also delineated. It is found that, with some exceptions, the trilepton channels are likely to be especially useful for this purpose.