Higgs Boson Search Sensitivity in the $H \to WW$ Dilepton Decay Mode at $\sqrt s = 7$ and 10 TeV

Details Higgs Boson Search Sensitivity in the $H \to WW$ Dilepton Decay Mode at $\sqrt s = 7$ and 10 TeV Higgs Boson Search Sensitivity in the $H \to WW$ Dilepton Decay Mode at $\sqrt s = 7$ and 10 TeV

2010-03-19

arxiv.org/abs/1003.3875v2

Physics

High Energy Physics

High Energy Physics - Phenomenology

29 pages, 8 figures. New results on estimated discovery reach for both CMS and ATLAS, as well as exclusion limits, along with

Scientific paper

Prospects for discovery of the standard model Higgs boson are examined at center of mass energies of $7$ and $10$ TeV at the CERN Large Hadron Collider. We perform a simulation of the signal and principal backgrounds for Higgs boson production and decay in the $W^+ W^-$ dilepton mode, finding good agreement with the ATLAS and CMS collaboration estimates of signal significance at 14 TeV for Higgs boson masses near $m_H = 160$~GeV. At the lower energy of $7$~TeV, using the same analysis cuts as these collaborations, we compute expected signal sensitivities of about $2$ standard deviations ($\sigma$'s) at $m_H = 160$~GeV in the ATLAS case, and about 3.6~$\sigma$ in the CMS case for $1$~fb$^{-1}$ of integrated luminosity. Integrated luminosities of 8~$\rm{fb}^{-1}$ and 3~$\rm{fb}^{-1}$ are needed in the ATLAS case at $7$ and $10$~TeV, respectively, for $5~\sigma$ level discovery. In the CMS case, the numbers are 2~$\rm{fb}^{-1}$ and 1~$\rm{fb}^{-1}$ at $7$ and $10$~TeV. Our different stated expectations for the two experiments arise from the more restrictive analysis cuts in the CMS case. Recast as exclusion limits, our results show that with $1~{\rm fb}^{-1}$ of integrated luminosity at 7~TeV, the LHC may be able to exclude $m_H$ values in the range 160 to 180~GeV provided no signal is seen.

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