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Discussion: How could ILC influence LHC triggers? Our first report gave many examples of

Discussion: How could ILC influence LHC triggers? Our first report gave many examples of how LHC+ILC data interpreted together could give new insights how ILC data could be fed back into the LHC data analyses All of this could in principle be done even after the completion of LHC

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Discussion: How could ILC influence LHC triggers? Our first report gave many examples of

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  1. Discussion: How could ILC influence LHC triggers? • Our first report gave many examples of • how LHC+ILC data interpreted together could give new insights • how ILC data could be fed back into the LHC data analyses • All of this could in principle be done even after the completion of LHC • data taking (although it will certainly work better if both machines are • alive simultaneously). • Already in the very first discussion about LHC/ILC studies, it was realized • that an even clearer argument for concurrent running could be made if • a scenario should arise where information from ILC can be used to • modify/upgrade LHC triggers and therefore optimize the acceptance for • certain new physics signals.

  2. In those first discussions some people felt that constructing such a scenario • might be too artificial. • Nevertheless, this question came back to us by people who read our first • report. • Should we make another attempt to work into this direction? • In order to make it a success (given limited human resources) • we should identify one promising scenario to work with • We should find a small team consisiting at least of • a theory expert for the chosen scenario • an LHC trigger (simulation) expert • an ILC contact person • It is clear that in particular without person #2 the project will fail.

  3. Identifying a scenario 2 suggestions from J. Ellis: „Suppose that the LC discovers a (meta)stable massive charged particle, such as a stau in a model with a gravitino LSP. It might be that the LHC experiments would/could modify their trigger and/or even their TOF systems so as to collect these more efficiently.“ „Alternatively, suppose that the LC discovers a massive charged particle that decays rapidly into a lighter neutral particle with a very small mass difference, as occurs in models with a neutralino LSP in the coannihilation region. Perhaps the LHC experiments would/could modify their lepton p_T triggers (replacing them by some other event characteristic? at the expense of some other triggers?) so as to collect these more efficiently.“

  4. H1H2bbbb H1H2bbττ,Yukawa production H2ZbbZ H2ZH1H1ZbbbbZ H1ZbbZ Identifying a scenario Another idea: MSSM Higgs sector with CP-violation LEP cannot exclude a very light (mainly CP-odd) Higgs Detection of H2 seems guaranteed at LHC and ILC but H1 may be more difficult. Question: could LHC see a low-mass (20-50) GeV bbbar resonance if ILC tells its mass? mH1(GeV)

  5. Other ideas from previous CERN meeting: • heavy stable charged particles ( R- hadrons) • ILC input: charginos/neutralinos (not too light but not too heavy) • - then use GUT relation to predict m(gluino) • heavy charginos with low-pt leptons ? • ILC can predict chi03/chi04/chi+2 from chi01/chi02/chi+1 • if cascades at LHC are complicated mass/coupling predictions may help • going down in energy ? • (move from g-dominated to q-dominated pdf’s to reduce bkgd if • low-mass hadronic resonance exisits) • very light rare di-lepton resonance (e.g. gg->“A”-> mumu in CPV MSSM) • Z’ with BR(Z’->hadrons) = 1: • open a mass-window in jet-jet trigger

  6. your input:

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