Les Houches

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

Slides (pdf) for Les Houches summary meeting https://www.dropbox.com/s/1vvlxkde87id0sh/Exotic_prod.pdf?dl=0

- 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

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):

Some references: 1302.0270, 1312.5316.

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

xsecsscalar.pdf

NLO production cross section for a scalar colour triplet (solid) and a “slepton” (dashed) at 8TeV (red) and 13TeV (blue), (coloured from 1412.5589, slepton from 1310.2621).

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

LEFT: NLO production cross section at 8 TeV for a scalar triplet (from 1412.5589).

RIGHT: 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).

Bounds from hh→multilepton searches

http://arxiv.org/pdf/1410.2751.pdf

discussion of 16/6/15

discussion of 18/6/15