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
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?