Supersymmetry with prejudice: Fitting the wrong model to LHC data
Abstract
We critically examine interpretations of hypothetical supersymmetric LHC signals, fitting to alternative wrong models of supersymmetry breaking. The signals we consider are some of the most constraining on the sparticle spectrum: invariant mass distributions with edges and endpoints from the golden decay chain q∼→qχ20(→l∼±l∓q)→χ10l+l-q. We assume a constrained minimal supersymmetric standard model (CMSSM) point to be the ‘correct’ one, but fit the signals instead with minimal gauge mediated supersymmetry breaking models (mGMSB) with a neutralino quasistable lightest supersymmetric particle, minimal anomaly mediation and large volume string compactification models. Minimal anomaly mediation and large volume scenario can be unambiguously discriminated against the CMSSM for the assumed signal and 1fb-1 of LHC data at s=14TeV. However, mGMSB would not be discriminated on the basis of the kinematic endpoints alone. The best-fit point spectra of mGMSB and CMSSM look remarkably similar, making experimental discrimination at the LHC based on the edges or Higgs properties difficult. However, using rate information for the golden chain should provide the additional separation required.
- Publication:
-
Physical Review D
- Pub Date:
- September 2012
- DOI:
- 10.1103/PhysRevD.86.055022
- arXiv:
- arXiv:1107.2856
- Bibcode:
- 2012PhRvD..86e5022A
- Keywords:
-
- 12.60.Jv;
- 14.80.Ly;
- Supersymmetric models;
- Supersymmetric partners of known particles;
- High Energy Physics - Phenomenology;
- High Energy Physics - Experiment
- E-Print:
- 24 pages, 6 figures, v4: new discussion, clarification, 1 plot added