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Z-path 2014 comparisons to ATLAS

F. Ould-Saada et al., University of Oslo. ‘ H’  gg. Z-path 2014 comparisons to ATLAS. ‘H’ ZZ * llll. Invariant Mass – Overview of student results. Z. Rediscover J/ y , U , Z particles and measure their masses and decay widths

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Z-path 2014 comparisons to ATLAS

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  1. F. Ould-Saada et al., University of Oslo ‘H’gg Z-path 2014comparisons to ATLAS ‘H’ZZ*llll

  2. Invariant Mass – Overview of student results Z • Rediscover J/y, U, Z particles and measure their masses and decay widths • Search for the Higgs boson (H) decaying to l+l- l+l- and gg • Search for a new, exotic Z’ boson that would decay into l+l- • … in a similar way as ATLAS did Z’ MC • You have mastered the Invariant Mass concept and applied the technique to: J/y U zPath@IMC 2014

  3. Invariant mass M(l+l-): ATLAS vs. IMC students • At the beginning of the LHC physics program, ATLAS rediscovered various standard model particles – J/y, U, Z, etc. – before seeking new phenomena Z Z’ MC J/y U • You have found the J/y(~3GeV), U (~10GeV), and Z (~91GeV) at the right masses! • The Z’ signal at ~1 TeV is Monte Carlo simulated • ATLAS searches for such exotic particles zPath@IMC 2014

  4. ATLAS status: Z?: yes Z’? No – not yet Z’ must be heavier than 2.9 TeV Invariant mass M(l+l-): ATLAS vs. IMC students • Is there any New Physics out there? For example a new weak interaction mediated by a Z’ boson? Z (data) m+m- Z (data) e+e- Z’ MC Z’ MC • With the Invariant Mass technique you could • Measure known particles • Look for new hypothetical particles – Z’, exactly like ATLAS does zPath@IMC 2014

  5. Higgs search H  4lATLAS vs. IMC Students M(eemm)=123 GeV • ATLAS results • H  ZZ*  llll • 25.3 fb-1 • You have searched for Higgs • H  llll with 2 fb-1 zPath@IMC 2014

  6. Higgs search H  gg: ATLAS vs. IMC Students • ATLAS results: H  gg • 25.5 fb-1 clear signal • You have searched for Higgs • H  gg with 2 fb-1 • You have several candidates at ~125 GeV • You don’t have enough statistics to reproduce the ATLAS result M(gg)=125 GeV • With 25 fb-1, you would clearly observe a signal on top of a large background. zPath@IMC 2014

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