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2015:groups:higgs:exhprod

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The aim of this group is to define a list of exotic production mechanisms of the 125 GeV Higgs, and understand how they can be disentangled from standard production. We also aim at clarifying the interplay of the EFT approach and the exotic production channels.

Interested people:

Giacomo Cacciapaglia, Thomas Flacke, Devdatta, Aldo Deandrea, Andrey Katz, Jose Miguel No, Alberto Parolini, Felix Yu, Aurelio Juste, Benjamin Fuks, Alexandra

Topics we discussed during the first meeting

- contamination of the SM single-Higgs searches by Exotic production (1404.2924)

- classification of Exotic production mechanisms (proposal by Felix Yu):

  • Resonant
  • Non Resonant (cascade decays):
    • asymmetric
    • symmetric

- list of exotic productions (pair and single):

  • VLQ pair production: QQ → h j h j (1312.5316)
    • Setting up a toy analysis:
    • (Alexandra) in the 4b final state we could try an “scale invariant” analysis to this channel to discover where it starts to look like with X>HH>4b because the T' boost (inspired by http://arxiv.org/abs/1303.6636)
  • VL lepton pp: LL → h l h l, h l h nu, h nu h nu

- Resonance h X: what still needs to be done?

  • h l
  • h gamma
  • h V broad resonance

- Double-higgs production from di-quarks de-excitations into the lighter states. Possible issues

  • direct constraints (quite strong for triplets, mild for sextets)
  • competition between Q*→Qh and Q*→QZ (depends on the mixing angle)
  • indirect constraints from ggH coupling (can be really strong for sextets)
  • non-colored di-quarks (couplings to Qd and Qu)?
  • full list of scalar colored di-quarks http://arxiv.org/pdf/1105.3161.pdf

- Double-Higgs production via loops of heavy states

Benchmark models

VLQ pair (and single) production

A single up-type VLQ that couples uniquely to the Higgs and an up or charm (up-type are theoretically preferred 1102.1987).

Interesting channels for double-Higgs production:

- Pair production: QQ → hj hj

- single production: q g → Q h → hj h

- t-channel exchange: q q → h h

- loop contribution (box diagram): g g → h h

Pair production cross section at 8 TeV (from 1111.5869):

fermion8.pdf

Some references: 1302.0270, 1312.5316.

coloured scalar pair production

The model consists on two coloured scalars, that couple to each other via a Higgs. The lightest one decays in di-jets (or jet-lepton).

- pair production of phi2 → [h phi1] or [jj/jl]: final states: hjj jj, hjj hjj / hjl jl, hjl hjl

- constraints from ggf

- bounds from pair di-jet resonances or leptoquark searches

Bounds from hh → bbgg, and di-jet pair resonances, on a scalar triplet decaying into hjj and jj

Exclusion from (RED) ALTAS hh→bbgg (1406.5053), and (BLUE) CMS di-jet pair resonant search (1412.7706), as a function of the mass of the scalar triplet and the BR(hjj). BR(jj) = 1-BR(hjj).

VLL (vector-like leptons)

Previous meetings

discussion of 16/6/15

2015/groups/higgs/exhprod.1434639277.txt.gz · Last modified: 2015/06/18 16:54 by giacomo.cacciapaglia