Reconstructing sparticle mass spectra using hadronic decays

Abstract

Most sparticle decay cascades envisaged at the Large Hadron Collider (LHC) involve hadronic decays of intermediate particles. We use state-of-the art techniques based on the K ⊥ jet algorithm to reconstruct the resulting hadronic final states for simulated LHC events in a number of benchmark supersymmetric scenarios. In particular, we show that a general method of selecting preferentially boosted massive particles such as W ± , Z 0 or Higgs bosons decaying to jets, using sub-jets found by the K ⊥ algorithm, suppresses QCD backgrounds and thereby enhances the observability of signals that would otherwise be indistinct. Consequently, measurements of the supersymmetric mass spectrum at the per-cent level can be obtained from cascades including the hadronic decays of such massive intermediate bosons.

Discovering Higgs bosons of the MSSM using jet substructure

“…[14]. There, however, the motivation was not to find the Higgs, but instead to recover the superpartner mass spectrum using a kinematical edge analysis.…”

Stop reconstruction with tagged tops

“…Tagging W bosons in their decays to geometrically large jets [35][36][37][38] has been around in the LHC literature for quite a while, including its applications in searches for supersymmetry [39][40][41][42][43]. Higgs tags can be implemented in a similar manner, and as it turns out they show the best performance [16,17,19,[39][40][41][42][43][44][45] when based on the purely geometric C/A jet algorithm [46][47][48][49].…”

“…Tagging W bosons in their decays to geometrically large jets [35][36][37][38] has been around in the LHC literature for quite a while, including its applications in searches for supersymmetry [39][40][41][42][43]. Higgs tags can be implemented in a similar manner, and as it turns out they show the best performance [16,17,19,[39][40][41][42][43][44][45] when based on the purely geometric C/A jet algorithm [46][47][48][49]. Inspired by searches for very heavy resonances decaying to top pairs [52][53][54] several top taggers have been developed, again in the same spirit, but based on different jet algorithms as well as on jet shapes [18,19,[55][56][57][58][59][60][61][62][63].…”

Three-particle templates for a boosted Higgs boson

“…They allow for tests of perturbative QCD and are important backgrounds for more exotic phenomena. Over the past few years, scenarios have been proposed in which these heavy particles are produced at large transverse momentum [1][2][3][4][5][6][7][8][9][10][11]. At high enough p T , their decay products will appear as heavy, collimated jets [12,13].…”