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Sparticles at the LHC

Daniel Feldman, Zuowei Liu and Pran Nath

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Sparticle mass hierarchies will play an important role in the type of signatures that will be visible at the Large Hadron Collider. We analyze these hierarchies for the four lightest sparticles for a general class of supergravity unified models including nonuniversalities in the soft breaking sector. It is shown that out of nearly 104 possibilities of sparticle mass hierarchies, only a small number survives the rigorous constraints of radiative electroweak symmetry breaking, relic density and other experimental constraints. The signature space of these mass patterns at the Large Hadron Collider is investigated using a large set of final states including multi-leptonic states, hadronically decaying τs, tagged b jets and other hadronic jets. In all, we analyze more than 40 such lepton plus jet and missing energy signatures along with several kinematical signatures such as missing transverse momentum, effective mass, and invariant mass distributions of final state observables. It is shown that a composite analysis can produce significant discrimination among sparticle mass patterns allowing for a possible identification of the source of soft breaking. While the analysis given is for supergravity models, the techniques based on mass pattern analysis are applicable to wide class of models including string and brane models.

Keywords

Supersymmetry Breaking

Beyond Standard Model

Supersymmetry Phenomenology

Supergravity Models

 

E-print Number: 0802.4085

Cited: by |

Refers: to

PACS

13.85.Qk Inclusive production with identified leptons, photons, or other nonhadronic particles

12.60.Jv Supersymmetric models

04.65.+e Supergravity

14.80.Ly Supersymmetric partners of known particles

12.15.Lk Electroweak radiative corrections

11.30.Qc Spontaneous and radiative symmetry breaking

Subjects

Gravitation and cosmology

Particle physics and field theory

Dates

Issue 04 (April 2008)

Received 29 February 2008, accepted for publication 27 March 2008

Published 14 April 2008



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