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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 ...
 +\\
 +\\
 +We will discuss the resonant production together with the "​Interference"​ group.
 +\\
 +\\
 +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.
 +\\
 +A reference for the singlet model and the interferences is
 +https://​arxiv.org/​pdf/​1508.05397.pdf
 +\\
 +\\
 +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