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Exploring BSM Searches: Insights from the Early Years of the LHC

This presentation by Dirk Zerwas at Moriond 2013 delves into the early operational years of the LHC, focusing on Beyond Standard Model (BSM) searches. With an engaging approach and minimal visual aids, Zerwas highlights the complexities of signal prediction, normalization, and the intricacies of different particle definitions. Key topics include W+X searches, quark/gluon distinctions, the effectiveness of simplified models like SUSY, and the practical challenges of achieving consistency in scale factors and cross-section measurements. Attendees are encouraged to embrace creativity in BSM research.

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Exploring BSM Searches: Insights from the Early Years of the LHC

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  1. Tools: Who needs whom? The first three years of the LHC March 21, 2013 Dirk Zerwas LAL Orsay • Charge: • no talk • practically no transparencies • be provocative

  2. BBSM (Background in BSM) • Kirill +Keith • Moriond 2013 • Search for W+X • X to jj • Many explanations • top background • new physics (majority) JES: different between quarks and gluons Changing as function of M • Can we learn something? • creativity in BSM is there  • effect hard to “predict” without knowledge of the calibration • data-driven normalization (top Xchecks) • anything to learn from this? • quark/gluon definition? (Gavin/Giulia?)

  3. BBSM in Susy • Scale factors: • are they N-analysis scalable? • A t what point do they have to be consistent? • can we Control-away a signal (shape)?

  4. BBSM Razor (see Matt Buckley’s talk) Recast search into flat background with a peaking signal • seems to be slightly less powerful than “standard SUSY search”? • is this more robust than using transfer factors? • or this just another TMVA, BDT, Mct, MT2 variable

  5. Cross sections and simplified models • BSM (e.g. SUSY): visible cross section: • useful? • how do you (=theorists) use it? • Simplified Models (heavy industry): • eg. Sq Sq  qχ±qχ± qWχ qWχ • disentangle different final states • old-fashioned way (LEP): MSSM • 3 masses (4 parameters) • who has used these? • how useful have they been? • cross section limit • what about the mass limit?

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