ХИГГС-БОЗОН В ЭКСПЕРИМЕНТАХ ATLAS и CMS НА БАК В.А.Щегельский Семинар ОФВЭ и ОТФ 30 мая 2013

2 Доклад основан на сообщениях ATLAS и CMS на Международных конференциях: LHCP, Barcelona, Flavor Physics &CP Violation,Rio de Janeiro, th Rencontres de Bloi,Particles physics,Bloi, European Linear Collider Workshop, DESY,

3 Barcelona, May 13, 2013! Sergio Bertolucci ! CERN There is a new boson of mass ~125 GeV, with properties consistent with the SM Higgs, within the current uncertainties. More data needed to ascertain the nature of this object

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6 To get a feeling of a scale of difficulties to extract the signal of rare Higgs decays….. Total X-section of the SM Higgs production is 15(19) pb for 7(8) TeV Integrated Lumi are 4.6 ( 21) 1/pb Br(H->4l) ~ 10**{-4} Expected number of events under 100% efficiency Nevnt ~ 50 Number of selected 4 leptons events is ~10**6 Compare: number of Z-bosons produced~10**9!! Rejecting power of the analysis procedure should be better than 10**5. Not easy.

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8 For the first time: VBF production is extracted

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13 Later it will be compared with an independent study PNPI/BINP

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32 SUMMARY

33 Disagreement in the signals strength might be connected with difficulties of efficiencies estimations ( MC) Difference in masses of ggF and VBF processes has no comments Small statistics and large background can lead to significant difference in masses estimation as one can see in the H->4l process. As we have shown in an independent search of for leptons resonance states (PNPI/BNPI, ATLAS) there is NO mass difference in H->4l and H->GamGam processes in the ATLAS and CMS studies. Послесловие

34 There is a new boson of mass ~125 GeV, with properties consistent with the SM Higgs, within the current uncertainties. More data needed to ascertain the nature of this object Заключение:

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