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2013:groups:higgs:ehd [2013/06/20 09:40] adam.falkowski |
2013:groups:higgs:ehd [2013/06/21 11:36] adam.falkowski |
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**Exotic Higgs Decays** | **Exotic Higgs Decays** | ||
- | Interested people: Adam, Roberto, Filip, Jack Gunion, Sabine, Grégory, Beranger, Kirtimaan, Yun Jiang, Aoife, Lorenzo, Alex A., Nazila, Andreas... (please add your name!) | + | Interested people: Adam, Roberto, Filip, Jack Gunion, Sabine, Grégory, Beranger, Kirtimaan, Yun Jiang, Aoife, Lorenzo, Alex A., Nazila, Andreas-1, Andreas-2, Giacomo, Aldo... (please add your name!) |
+ | Also: one should coordinate with the Snowmass exotic Higgs group. | ||
Finding exotic (not predicted by the SM) Higgs decays could be the shortest route to new physics. | Finding exotic (not predicted by the SM) Higgs decays could be the shortest route to new physics. | ||
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Z+MET decays can occur e.g. in inverse see-saw models (ref?) as a cascade decay h-> nu N -> nu Z nu. | Z+MET decays can occur e.g. in inverse see-saw models (ref?) as a cascade decay h-> nu N -> nu Z nu. | ||
- | To do: check the constraints on the effective operator, find the maximum allowed branching fraction, check whether some LHC searches (monophotons? mono-Z?) could pick up this decay, devise experimental strategy. | + | To do: check the constraints on the effective operator, find the maximum allowed branching fraction, check whether some LHC searches (monophotons? mono-Z?) could pick up this decay, devise experimental strategy. Check contraints from existing H-> ZZ |
+ | |||
+ | __Interested people:__ Adam, ... | ||
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Note that this decay cannot be realized in the 2HDM+singlet models in which we require X to be a single additional singlet that is a stable DM candidate by means of imposing Z_2 symmetry so that single S terms are absent in the Lagrangian. In this case, X would have to be two S states, i.e. H->SS h or something of the sort. This would yield invisible + 2 SM particles. A related scenario is H->h h where one h decays to f fbar and the other h decays to SS, i.e. h has a mixture of regular and invisible decays. | Note that this decay cannot be realized in the 2HDM+singlet models in which we require X to be a single additional singlet that is a stable DM candidate by means of imposing Z_2 symmetry so that single S terms are absent in the Lagrangian. In this case, X would have to be two S states, i.e. H->SS h or something of the sort. This would yield invisible + 2 SM particles. A related scenario is H->h h where one h decays to f fbar and the other h decays to SS, i.e. h has a mixture of regular and invisible decays. | ||
- | To do: concrete models, existing constraints and experimental strategies. | + | To do: concrete models, existing constraints and experimental strategies. In particular, interesting to recast the SUSY dilepton+MET searches in this context. |
+ | |||
+ | __Interested people:__ Jack, Aoife, Andreas | ||
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3 particle: | 3 particle: | ||
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To do: existing constraints, e.g. from h->ZZ*4l; limits on F from direct searches (LEP and LHC), precision contraints on F, collider strategies | To do: existing constraints, e.g. from h->ZZ*4l; limits on F from direct searches (LEP and LHC), precision contraints on F, collider strategies | ||
+ | |||
+ | __Interested people:__ Aldo, Giacomo, Aldo | ||
- h -> Z/A X - > Z/A f fbar where X is an intermediate boson , and f could be b, tau, mu, e, etc. | - h -> Z/A X - > Z/A f fbar where X is an intermediate boson , and f could be b, tau, mu, e, etc. |