Hig11022TWiki < CMSPublic

CMSPublic Web>Hig11022TWiki (2011-11-15, GiovanniPetrucciani) (raw view)
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   * Set CDS = http://cdsweb.cern.ch/record/1376643?ln=en
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---+ Combination of Higgs Searches (Lepton Photon 2011)

This is a condensed description with plots for the analysis [[http://cdsweb.cern.ch/record/1376643?ln=en][LINK TO CDS]]

---++ Abstract

<div style="max-width: 66em;">
The overall combination is presented of eight standard model (SM) Higgs boson searches performed by the CMS Collaboration using the following Higgs boson decay signatures: <nobr>H &rarr; &gamma;&gamma;</nobr>, <nobr>H &rarr; &tau;&tau;</nobr>, <nobr>H &rarr; bb</nobr>, <nobr>H &rarr; WW &rarr; 2l2&nu;</nobr>, <nobr>H &rarr; ZZ &rarr; 4l</nobr>, <nobr>H &rarr; ZZ &rarr; 2l2&tau;</nobr>, <nobr>H &rarr; ZZ &rarr; 2l2&nu;</nobr>, and <nobr>H &rarr; ZZ &rarr; 2l2q</nobr>. Depending on the analysis, the amount of data used corresponds to 1.1-1.7 fb<sup>&#8722;1</sup> of integrated luminosity. The SM Higgs boson is excluded at 95% C.L. in three mass ranges 145-216, 226-288, and 310-400 !GeV/c&sup2;. The expected exclusion in the absence of a signal is 130-440 !GeV/c&sup2;. The largest excursion of the observed data from the expected has a probability of 0.4 after taking into account the look-elsewhere effect. At 90% C.L., we exclude the SM Higgs boson in the continuous mass range from 144-440 !GeV/c&sup2;. The reported limits were obtained using the modified frequentist construction known as the CLs method.
</div>

---++ Plots


<div style="max-width: 99em;">
| *Figure set*                                                                      | *Description* | *Variants* |
| <!-- ========================================================================================================================================== --> \
  <img src="http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb_logx.png" height="300" /> \
  | *The CLs value for the standard model Higgs hypothesis as a function of the Higgs \
    boson mass in the range 110-600 !GeV/c&sup2;*. %BR% The observed values are shown by a solid line. The \
    dashed black line indicates the median expected CLs value for the background-only hypothesis, \
    while the green/yellow bands indicate the ranges that are expected to contain 68%/95% of all \
    observed limit excursions from the median. The three red horizontal lines show confidence \
    levels of 90%, 95%, and 99% defined as (1 - CLs). \
    | linear x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb.pdf][pdf]])%BR% \
     log x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb_logx.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb_logx.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb_logx.pdf][pdf]])%BR% \
    low mass ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb_zoom.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb_zoom.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb_zoom.pdf][pdf]]) |
| <!-- ========================================================================================================================================== --> \
  <img src="http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb_logx.png" height="300" /> \
  | *The combined 95% C.L. upper limits on the signal strength modifier <nobr>&mu; = &sigma;/&sigma;<sub>SM</sub></nobr>, \
as a function of the SM Higgs boson mass in the range 110-600 !GeV/c&sup2;*. %BR% The observed limits \
are shown by the solid symbols and the black line. The dashed line indicates the median \
expected limit on m for the background-only hypothesis, while the green/yellow bands indicate \
the ranges that are expected to contain 68%/95% of all observed limit excursions from the \
median. \
    | linear x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb.pdf][pdf]])%BR% \
     log x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb_logx.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb_logx.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb_logx.pdf][pdf]])%BR% \
    low mass ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb_zoom.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb_zoom.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb_zoom.pdf][pdf]]) |
| <!-- ========================================================================================================================================== --> \
  <img src="http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/lte_cls_comb_logx.png" height="300" /> \
  | *The combined 95% C.L. upper limits on the signal strength modifier <nobr>&mu; = &sigma;/&sigma;<sub>SM</sub></nobr>, \
as a function of the SM Higgs boson mass in the range 110-600 !GeV/c&sup2;*. %BR% The observed limits \
are shown by the solid symbols and the black line. The dashed line indicates the median \
expected limit on m for the background-only hypothesis, while the green/yellow bands indicate \
the ranges that are expected to contain 68%/95% of all observed limit excursions from the \
median. The mass ranges excluded by LEP, by Tevatron and by this result are shown as hatched areas. \
    | linear x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/lte_cls_comb.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/lte_cls_comb.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/lte_cls_comb.pdf][pdf]])%BR% \
     log x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/lte_cls_comb_logx.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/lte_cls_comb_logx.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/lte_cls_comb_logx.pdf][pdf]])%BR% \
    low mass ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/lte_cls_comb_zoom.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/lte_cls_comb_zoom.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/lte_cls_comb_zoom.pdf][pdf]]) |
| <!-- ========================================================================================================================================== --> \
  <img src="http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/CMS_LP11_vs_TEV_EPS11.png" height="300" /> \
  | *The combined 95% C.L. upper limits on the signal strength modifier <nobr>&mu; = &sigma;/&sigma;<sub>SM</sub></nobr>, \
as a function of the SM Higgs boson mass in the range 110-600 !GeV/c&sup2;*. %BR% The observed limits \
are shown by the solid symbols and the black line. The dashed line indicates the median \
expected limit on m for the background-only hypothesis, while the green/yellow bands indicate \
the ranges that are expected to contain 68%/95% of all observed limit excursions from the \
median. The Tevatron observed and expected limits are also shown. \
    | [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/CMS_LP11_vs_TEV_EPS11.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/CMS_LP11_vs_TEV_EPS11.pdf][pdf]] |
| <!-- ========================================================================================================================================== --> \
  <img src="http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all2_logx.png" height="300" /> \
  | *The 95% C.L. upper limits on the signal strength modifier  <nobr>&mu; = &sigma;/&sigma;<sub>SM</sub></nobr> \
as a function of the SM Higgs boson mass in the range 110-600 !GeV/c&sup2; for the eight major \
analyses and their combination*. %BR% The limits are obtained with the CLs method. The solid lines \
show the observed limits, while the dashed lines indicate the median expected assuming the \
_background-only_ hypothesis. \
    | linear x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all2.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all2.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all2.pdf][pdf]])%BR% \
     log x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all2_logx.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all2_logx.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all2_logx.pdf][pdf]])%BR% \
    low mass ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all2_zoom.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all2_zoom.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all2_zoom.pdf][pdf]]) |
| <!-- ========================================================================================================================================== --> \
  <img src="http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all_logx.png" height="300" /> \
  | *The observed 95% C.L. upper limits on the signal strength modifier <nobr>&mu; = &sigma;/&sigma;<sub>SM</sub></nobr> \
as a function of the SM Higgs boson mass in the range 110-600 !GeV/c&sup2; for the eight major \
analyses and their combination*. %BR% The limits are obtained with the CLs method. \
    | linear x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all.pdf][pdf]])%BR% \
     log x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all_logx.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all_logx.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all_logx.pdf][pdf]])%BR% \
    low mass ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all_zoom.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all_zoom.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_all_zoom.pdf][pdf]]) |
| <!-- ========================================================================================================================================== --> \
  <img src="http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_allexp_logx.png" height="300" /> \
  | *The expected 95% C.L. upper limits on the signal strength modifier <nobr>&mu; = &sigma;/&sigma;<sub>SM</sub></nobr> \
as a function of the SM Higgs boson mass in the range 110-600 !GeV/c&sup2; for the eight major \
analyses and their combination*. %BR% The limits are obtained with the CLs method. \
    | linear x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_allexp.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_allexp.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_allexp.pdf][pdf]])%BR% \
     log x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_allexp_logx.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_allexp_logx.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_allexp_logx.pdf][pdf]])%BR% \
    low mass ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_allexp_zoom.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_allexp_zoom.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_allexp_zoom.pdf][pdf]]) |
| <!-- ========================================================================================================================================== --> \
  <img src="http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb_liny.png" height="300" /> \
  | *The _local_ <i>p</i>-values (top) and observed best-fit signal strength <nobr>&mu;&#x302; = &sigma;/&sigma;<sub>SM</sub></nobr> (bottom) \
vs Higgs boson mass.* %BR% The <i>p</i>-value is an estimated probability of upward background fluctuations \
as high or higher than the excesses observed in data. After taking into account the \
look-elsewhere effect (see text), the probability to see an excess at least as large as the one observed \
in data is &sim;0.4. The &mu;&#x302; value indicates by what factor the SM Higgs cross section would \
have to be rescaled to best match the observed data. \
    | linear y ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb_liny.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb_liny.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb_liny.pdf][pdf]]) %BR% \
      log y ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb.pdf][pdf]])  %BR% \
      low mass linear y ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb_zoom_liny.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb_zoom_liny.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb_zoom_liny.pdf][pdf]]) %BR% \
      low mass log y ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb_zoom.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb_zoom.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pval_ml_comb_zoom.pdf][pdf]]) |
| <!-- ========================================================================================================================================== --> \
  <img src="http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_all_zoom.png" height="300" /> \
  | *The overall combined _local_ <i>p</i>-values (solid black line) and contributions of individual \
channels entering the combination vs. Higgs boson mass.* %BR% The <i>p</i>-valuee is an estimated probability \
of upward background fluctuation as high or higher than the excesses observed in data. \
After taking into account the look-elsewhere effect (see text), the probability to see an excess at \
least as large as the one observed in data is &sim;0.4. \
    | linear x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_all.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_all.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_all.pdf][pdf]])%BR% \
     log x ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_all_logx.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_all_logx.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_all_logx.pdf][pdf]])%BR% \
    low mass ([[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_all_zoom.png][png]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_all_zoom.eps][eps]], [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_all_zoom.pdf][pdf]]) |

</div>

---++ Tables

The following tables are also available as individual files in text format:
   * [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/smcls_comb.txt][CLs of SM Higgs Hypothesis]]
   * [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/cls_comb.txt][CLs limit on &mu; = &sigma;/&sigma;<sub>SM</sub>]]
   * [[http://cms-higgs-results.web.cern.ch/cms-higgs-results/Comb/HIG-11-022/pvala_comb.txt][<i>Local p</i>-values]]
Topic revision: r4 - 2011-11-15 - GiovanniPetrucciani
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