The plot on the left (eps format) shows the relative change in cross sections for signal (mH=160 GeV) and main backgrounds for the H→WW→2l2v search as the pp center-of-mass energy changes from 14 to 10 TeV. The results are obtained with MCFM. | |
The plot on the left (eps format) shows the relative change in cross section for signal and the main ZZ-background for the H→ZZ→4l search as the pp center-of-mass energy changes from 14 to 10 TeV. The results are obtained with Pythia. The ZZ cross sections are evaluated for 4-lepton invariant masses with ±10 GeV window around the chosen Higgs boson masses. | |
The plot on the left (eps format) shows the relative change in CMS acceptance for signal and the main ZZ-background for the H→ZZ→4l search as the pp center-of-mass energy changes from 14 to 10 TeV. The results are obtained with Pythia. The ZZ acceptance is evaluated for 4-lepton invariant masses within ±10 GeV windows around the chosen Higgs boson masses. | |
The plot on the left (eps format) shows the projected 95% CL exclusion limits in terms of a ratio of an excluded cross section to the Standard Model Higgs boson cross section for the 14 and 10 TeV center-of-mass energies and an amount of data corresponding to an integrated luminosity of 1 fb^{-1}. Only H→ZZ→4l and H→WW→2l2v were combined. Two different statistical approaches, Bayesian and CL_{s}, give consistent results, the differences being typically less than 10% (even though correlations between errors in this exercise were treated somewhat differently). Overall, the relative difference in the ratio r for 14 and 10 TeV pp-colision energies is approximately a factor of 1.5, which means that it would take twice as much luminosity at 10 TeV to match the sensitivity attainable in 14-TeV collisions. For Higgs masses 160-170 GeV, 10 TeV collisions, and 1 fb^{-1} luminosity, the ratio r is ~0.4. Using a simple statistical extrapolation in the form r~r_{0}/sqrt(L/L_{0}), one can project that one would need 200 pb^{-1} to be able to exclude the SM Higgs boson in this mass range at the 10-TeV LHC. Detailed full simulation studies for the CMS reach at 10 TeV and 200 pb^{-1}are underway. |
-- AndreyKorytov - 11-Apr-2010
I | Attachment | History | Action | Size | Date | Who | Comment |
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eps | 95CL_r_14-10-TeV_1fb_CLs_Bayesian.eps | r1 | manage | 302.6 K | 2010-04-11 - 04:00 | AndreyKorytov | |
png | 95CL_r_14-10-TeV_1fb_CLs_Bayesian.png | r1 | manage | 114.9 K | 2010-04-11 - 04:00 | AndreyKorytov | |
eps | HWW_CrossSectionRatios.eps | r1 | manage | 293.7 K | 2010-04-11 - 04:01 | AndreyKorytov | |
png | HWW_CrossSectionRatios.png | r1 | manage | 114.3 K | 2010-04-11 - 04:01 | AndreyKorytov | |
eps | HZZ_AcceptanceRatios.eps | r1 | manage | 97.0 K | 2010-04-11 - 04:01 | AndreyKorytov | |
png | HZZ_AcceptanceRatios.png | r1 | manage | 71.9 K | 2010-04-11 - 04:02 | AndreyKorytov | |
eps | HZZ_CrossSectionRatios.eps | r1 | manage | 86.9 K | 2010-04-11 - 04:02 | AndreyKorytov | |
png | HZZ_CrossSectionRatios.png | r1 | manage | 64.0 K | 2010-04-11 - 04:03 | AndreyKorytov |