Exotics decay of heavy bosons in VLQs and extra scalars

People interested: Daniele Barducci, Thomas Flacke, Minho Son, Benjamin Fuks, Devdatta Majumder, Ramona Groeber, Haiying Cai, Tetiana Berger-Hryn'ova , Alexandra Carvalho, Abhishek Iyer Tom Rizzo…

Motivations and goal

• Exotic decays such as $\rho \to T \bar t$ can eat branching ratio from standard search channels (dilepton, dibosons), rendering these direct searches less sensitive (see e.g. https://arxiv.org/pdf/1511.01101.pdf Fig. 3)
• Investigate the signatures arising from the decay of a heavy bosons (spin 0 and spin 1) in SM quarks and VLQs, e.g. Z'→ VLQ top, or extra light scalars, e.g. Z' → Z a

Possibile bosons involve

• spin 1 color singlet
• spin 1 color octet
• spin 0 color singlet
• …

Strategies

• Categorize the possible decays of the identified resonances. This was done for VLQ in Les Houches 2015

• Check the sensitivity of SM searches. For example the $\rho \to T \bar t \to Z t \bar t$ has the same final state of the SM $t\bar t Z$ search
• Check the sensitivity of single production mode. Also in this case the final state can be the same. However single production searches usually exploit a forward jet, which is not present here

References

• “Search for a heavy resonance decaying to a top quark and a vector-like top quark at 13 TeV” https://arxiv.org/pdf/1703.06352.pdf
• ttZ resonance search https://arxiv.org/pdf/1610.08810.pdf
• Massive vectors couplings https://arxiv.org/pdf/1607.07621.pdf
• Minimal matter https://arxiv.org/pdf/0908.1567.pdf
• Simplified model with Spin 0 - Tt, (T→ Wb,Zh,th) where T is singlet top partner.
  • https://journals.aps.org/prd/abstract/10.1103/PhysRevD.95.035039. with possibility of RS KK gluon
  • https://arxiv.org/pdf/1609.06502.pdf
  • https://arxiv.org/pdf/1411.1771.pdf

Blackboard

• 20-06-2017

Further questions

• From the polarization of the top arising from the decay is it possible to infer the representation to which the heavy boson belongs, i.e. predict the presence of other states?