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Recent Developments in Higgs Searches: Fermiophobic, Invisible Decays, and Doubly Charged Scalars

This inventory discusses key changes in Standard Model (SM) Higgs searches, including the Fermiophobic Higgs, invisible Higgs decays to dark matter, and the presence of doubly charged Higgs scalar particles. It also covers aspects of the Next-to-Minimal Supersymmetric Standard Model (NMSSM) search and processes in the Two Higgs Doublet Model (2HDM). Insights on unconventional decay channels and potential collider signatures are explored.

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Recent Developments in Higgs Searches: Fermiophobic, Invisible Decays, and Doubly Charged Scalars

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  1. Inventory of BSM Higgs searches in CMS Mario Kadastik, Sara Bolognesi

  2. Basic changes to SM • 4th generation quarks • s and BR are different and systematic uncertainties large (model becomes non-perturbative at high q’ mass) • The numbers have been recently re-calculated for two q’ masses and we now have all the input that was needed • Fermiophobichiggs • Assume at tree level only couplings to bosons, search channels therefore only in those final states • The question is are loop induced decays to fermions really small enough to fully discount, need theory input • Invisible Higgs decays • Assumption is that part of Higgs decay width is to a DM like particle that cannot be reconstructed • Most interesting in associated production • Assumes BR(Hinv.)=1 • σ(ZH → 2l+MET) / σ(ZZ → 2l2ν) ≈ 0.13 × BR(H → inv.) • Definitely needs collaboration with property measurement as they all tie together

  3. Doubly charged Higgs • Additional triplet (adding F0, F+, F++) • From various models (Littlest Higgs, LR symmetric, basic extension to account for see-saw etc) • Violates lepton number and flavor in decays • Doubly charged scalar a clear signature, however also singly charged component is used • Need synchronization on cross section and benchmark points used for searches. Prior to CMS searches only 100% decays to one channel were searched.

  4. NMSSM search • In NMSSM the fine tuning of μ-term solved by introducing a singlet scalar field S • S expands the Higgs sector to three CP-even scalars (h1, h2 and h3), two CP-odd scalars (a1, a2) and two charged scalars (H+, H-) • NMSSM predicts a light (O(10 GeV)) CP-odd Higgs boson • Best channel in hadron collider is amm (tt has higher BR, but harderto search) • If BR(haa) large enough can explain m(h) below LEP limit as well as Z+b jets excess seen at LEP • The three generators that can do this process all give different distributions so very large uncertainties • As a new search we also plan haammtt

  5. 2HDM • SM Higgs scalar sector enlarged with an additional SU(2)L doublet with 4 free parameters (mh, mT, mA, tanb) • Unconventional processes arise: • h0 → A0A0, H0H0, H+H- • H± → W±A0 • H0 → ZA0 (the searched one) • Analysis shares same final state as ZZ2l2t • If mA ~ mZ, then it’s ZZ cross-section measurement • Could also have a very boosted A0 and collimated taus

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