2013:groups:higgs:ehd
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2013:groups:higgs:ehd [2013/06/19 15:59] aoife.bharucha |
2013:groups:higgs:ehd [2013/06/19 17:52] lorenzo.basso |
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| **Exotic Higgs Decays** | **Exotic Higgs Decays** | ||
| - | Interested people: Adam, Roberto, Filip, Jack Gunion, Sabine, Grégory, Beranger, Kirtimaan, Yun Jiang, Aoife... (please add your name!) | + | Interested people: Adam, Roberto, Filip, Jack Gunion, Sabine, Grégory, Beranger, Kirtimaan, Yun Jiang, Aoife, Lorenzo... (please add your name!) |
| 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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| The goal of this project is to 1) classify possible exotic Higgs decays, 2) Check existing constraints on the couplings mediating exotic decays, so as to see whether they leave room a non-negligible branching fraction, 3) Prompt experimental searches for the motivated decays that are not being searched for by experiments | The goal of this project is to 1) classify possible exotic Higgs decays, 2) Check existing constraints on the couplings mediating exotic decays, so as to see whether they leave room a non-negligible branching fraction, 3) Prompt experimental searches for the motivated decays that are not being searched for by experiments | ||
| - | To facilitate a systematic exploration one can classify the decays according to the number of SM particles the Higgs decays to. Below are some examples, you're welcome to add more. | + | To facilitate a systematic exploration one can classify the decays according to the number of visible SM particles the Higgs decays to. Below are some examples, you're welcome to add more. |
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| E.g these decays could be induced by the operator -c|H|^2/v^2 F_{\mu \nu} X_{\mu \nu} where | E.g these decays could be induced by the operator -c|H|^2/v^2 F_{\mu \nu} X_{\mu \nu} where | ||
| - | X_\mu is a dark vector boson that subsequently decays to the DM particles. gamma+MET decays could also arise from the cascade decays in h-> neutralino+gravitino -> 2xgravitino+gamma in SUSY, see 1203.4563 | + | X_\mu is a dark vector boson that subsequently decays to the DM particles. gamma+MET decays could also arise from the cascade decays in h-> neutralino+gravitino -> 2xgravitino+gamma in SUSY, see 1203.4563. |
| + | 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. | ||
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| 3 particle: | 3 particle: | ||
| - | - h -> f1 F(*) -> Z f1 f2, where f1 f2 are SM fermions, and F is a heavy BSM fermion with couplings y h F f1, g F \gamma_\mu f2 Z_\mu. F could be charged or not charged, colored or not charged (several possibilities with different f1 f2). | + | - h -> f1 F(*) -> Z f1 f2, where f1 f2 are SM fermions, and F is a heavy BSM fermion with couplings y h F f1, g F \gamma_\mu f2 Z_\mu. F could be charged or not charged, colored or not charged (several possibilities with different f1 f2). For this case must check LEP limits on Z^(*)-> f F. If F must be very heavy then BR for such decay would be very small. |
| - | + | ||
| - | - for this case must check LEP limits on Z^(*)-> f F. If F must be very heavy then BR for such decay would be very small. | + | |
| - | To do: existing constraints, e.g. from h->ZZ*4l; limits on F from direct searches, 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 |
| - 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. | ||
2013/groups/higgs/ehd.txt · Last modified: 2013/06/30 22:13 by lorenzo.basso
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