2017:groups:higgs:2h
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2017:groups:higgs:2h [2017/06/17 15:44] jose_miguel.no |
2017:groups:higgs:2h [2017/06/24 13:24] haiying.cai |
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| - | Interested people: Jose Miguel No, Jose Zurita, | + | ====== Higgs Self Coupling and di-Higgs ====== |
| - | 1. V phi, with phi -> gamma gamma, what does the LHC can say? | ||
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| - | bounds from LEP. what is the LHC capability? | ||
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| - | bounds from H coupling measurements to ZZ and EWPT | ||
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| - | 2. Complementarity with phi single production together with a ISR | ||
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| - | Light scalars (m_{phi} < m_h = 125 GeV) with no phi V V coupling (V = SM gauge boson) but coupling to fermions. Motivated in extended Higgs sectors (e.g. light Higgses in 2HDM) when the 125 GeV is SM like (2HDM "alignment limit"). | ||
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| - | Weakly constrained by LEP (no V phi production). Maybe challenging @ LHC? phi recoiling against a hard jet could allow to trigger on this (phi -> gamma gamma? tau tau?). | ||
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| - | 3. Exotic Higgs decays: What are the holes? | ||
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| - | h -> a a, Z a, a a' with a, a' scalar/pseudoscalar (for Z a, a is pseudoscalar) | ||
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| - | * Current searches for h -> a a: 4 muon, 2 mu 2 b, 4 tau, 2 tau 2 mu, 4 b... | ||
| - | * Interesting to look at signatures with resolved/not resolved photons: 2b 2gamma, 4 gamma (for unresolved 2 gamma pairs, measurement of h->gamma gamma could yield weak constraint) | ||
| - | * h -> Z a (a -> gamma gamma) has been initially studied by Bauer, Neubert, Thamm in [[https://arxiv.org/pdf/1704.08207|1704.08207]], for a being an ALP (axion-like particle) | ||
| - | * h -> a a': if ma is different from ma', h -> a a searches would miss it (also depends on final state) | ||
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| - | h->chi1 chi2 | ||
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| - | * Decays involving MET? (e.g. chi1 invisible); (Also considerable for h -> a a' and h -> Z a) | ||
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| - | Exotic Higgs decays into LLP (displaced vertices). Role of LHCb (also BaBar, Belle II) | ||
| + | Interested people: Fabio Maltoni, Minho Son, José Zurita, Benjamin Fuks, Ramona Groeber, Alexandra Carvalho, Shankha Banerjee, Haiying Cai, Biplob Bhattacherjee ... | ||
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| + | We will discuss the resonant production together with the "Interference" group. | ||
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| + | Idea so far: Parameterise resonant production in terms of 5 parameters. Check when only a subset is necessary, check under which circumstances there is sizeable interference with box and 125 GeV Higgs exchange. | ||
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| + | A reference for the singlet model and the interferences is | ||
| + | https://arxiv.org/pdf/1508.05397.pdf | ||
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| + | Further possible discussion points for the kick-off meeting:\\ | ||
| + | 1.) status what kind of analysis ongoing?\\ | ||
| + | 2.) resonant production searches at the moment in terms of benchmarks, how to benchmark, generalisation, interference?\\ | ||
| + | 3.) combination different final states \\ | ||
| + | 4.) Scenarios that allow us to observe new physics for first time in HH production?\\ | ||
| + | 5.) in EFT analysis BR remain SM-like, can be improved on that? \\ | ||
| + | 6.) larger bounds on trilinear Higgs self-coupling can be usually obtained in negative range, but most models have positive deviation, which models have negative deviation?\\ | ||
2017/groups/higgs/2h.txt · Last modified: 2017/06/25 21:28 by majumder.devdatta
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