Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC pp collision data at $ \sqrt{s}=7 $ and 8 TeV

The ATLAS & CMS collaborations
JHEP 08 (2016) 045, 2016.

Abstract (data abstract)
CERN-LHC. Combined ATLAS and CMS measurements of the Higgs boson production and decay rates, as well as constraints on its couplings to vector bosons and fermions, are presented. The combination is based on the analysis of five production processes, namely gluon fusion, vector boson fusion, and associated production with a $W$ or a $Z$ boson or a pair of top quarks, and of the six decay modes $H \to ZZ, WW$, $\gamma\gamma, \tau\tau, bb$, and $\mu\mu$. All results are reported assuming a value of 125.09 GeV for the Higgs boson mass, the result of the combined measurement by the ATLAS and CMS experiments. The analysis uses the CERN LHC proton-proton collision data recorded by the ATLAS and CMS experiments in 2011 and 2012, corresponding to integrated luminosities per experiment of approximately 5 fb$^{-1}$ at $\sqrt{s}$=7 TeV and 20 fb$^{-1}$ at $\sqrt{s}$ = 8 TeV. The Higgs boson production and decay rates measured by the two experiments are combined within the context of three generic parameterisations: two based on cross sections and branching fractions, and one on ratios of coupling modifiers. Several interpretations of the measurements with more model-dependent parameterisations are also given. The combined signal yield relative to the Standard Model prediction is measured to be 1.09 $\pm$ 0.11. The combined measurements lead to observed significances for the vector boson fusion production process and for the $H \to \tau\tau$ decay of 5.4 and 5.5 standard deviations, respectively. The data are consistent with the Standard Model predictions for all parameterisations considered.

  • Table 1

    Data from Tab 8

    10.17182/hepdata.78403.v1/t1

    Best fit values of $\sigma_i \cdot \mathrm{B}^f$ for each specific channel $i \to H\to f$, as obtained from the generic...

  • Table 2

    Data from Tab 8, Fig 7

    10.17182/hepdata.78403.v1/t2

    Best fit values of $\sigma_i \cdot \mathrm{B}^f$ relative to their SM prediction for each specific channel $i \to H\to f$,...

  • Table 3

    Data from Tab 9, Tab 20

    10.17182/hepdata.78403.v1/t3

    Best fit values of $\sigma(gg\to H\to ZZ)$, $\sigma_i/\sigma_{gg\mathrm{F}}$, and $\mathrm{B}^f/\mathrm{B}^{ZZ}$ from the combined analysis of the $\sqrt{s}$=7 and 8 TeV...

  • Table 4

    Data from Fig 8

    10.17182/hepdata.78403.v1/t4

    Best fit values of $\sigma(gg\to H\to ZZ)$, $\sigma_i/\sigma_{gg\mathrm{F}}$, and $\mathrm{B}^f/\mathrm{B}^{ZZ}$ relative to their SM prediction from the combined analysis of...

  • Table 5

    Data from Tab 21

    10.17182/hepdata.78403.v1/t5

    Best fit values of $\sigma(gg\to H\to WW)$, $\sigma_i/\sigma_{gg\mathrm{F}}$, and $\mathrm{B}^f/\mathrm{B}^{WW}$ from the combined analysis of the $\sqrt{s}$=7 and 8 TeV...

  • Table 6

    Data from Fig 30

    10.17182/hepdata.78403.v1/t6

    Best fit values of $\sigma(gg\to H\to WW)$, $\sigma_i/\sigma_{gg\mathrm{F}}$, and $\mathrm{B}^f/\mathrm{B}^{WW}$ relative to their SM prediction from the combined analysis of...

  • Table 7

    Data from Fig 10, Tab 10, Tab 22

    10.17182/hepdata.78403.v1/t7

    Best fit values of $\kappa_{gZ}= \kappa_{g}\cdot\kappa_{Z} / \kappa_{H}$ and of the ratios of coupling modifiers, as defined in the most...

  • Table 8

    Data from Fig12, Tab 11

    10.17182/hepdata.78403.v1/t8

    Measured global signal strength $\mu$ and its total uncertainty, together with the breakdown of the uncertainty into its four components...

  • Table 9

    Data from Fig 12, Tab 12

    10.17182/hepdata.78403.v1/t9

    Measured signal strengths $\mu$ and their total uncertainties for different Higgs boson production processes. The results are shown for the...

  • Table 10

    Data from Fig 13, Tab 13

    10.17182/hepdata.78403.v1/t10

    Measured signal strengths $\mu$ and their total uncertainties for different Higgs boson decay channels. The results are shown for the...

  • Table 11

    Data from Tab 15a

    10.17182/hepdata.78403.v1/t11

    Results of the ten-parameter fit of $\mu_F^f = \mu_{gg\mathrm{F}+ttH}^f$ and $\mu_V^f = \mu_{\mathrm{VBF}+VH}^f$ for each of the five decay channels....

  • Table 12

    Data from Tab 15b

    10.17182/hepdata.78403.v1/t12

    Results of the six-parameter fit of the global ratio $\mu_V/\mu_F = \mu_{\mathrm{VBF}+VH}/\mu_{gg\mathrm{F}+ttH}$ together with $\mu_F^f$ for each of the five...

  • Table 13

    Data from Fig 15a, Tab 17a

    10.17182/hepdata.78403.v1/t13

    Fit results allowing BSM loop couplings, assuming that $|\kappa_{V}| \le$ 1, where $\kappa_{V}$ denotes $\kappa_{Z}$ or $\kappa_{W}$, and that $\mathrm{B_{BSM}}...

  • Table 14

    Data from Fig 15b, Tab 17b

    10.17182/hepdata.78403.v1/t14

    Fit results allowing BSM loop couplings, assuming that there are no additional BSM contributions to the Higgs boson width, i.e....

  • Table 15

    Data from Fig 18, Tab 18

    10.17182/hepdata.78403.v1/t15

    Fit results for the parameterisation assuming the absence of BSM particles in the loops ($\mathrm{B_{BSM}}$=0). The results with their measured...

  • Table 16

    Data from Fig 20, Tab 19a

    10.17182/hepdata.78403.v1/t16

    Summary of fit results for a parameterisation probing the ratios of coupling modifiers for up-type versus down-type fermions. The results...

  • Table 17

    Data from Fig 22, Tab 19b

    10.17182/hepdata.78403.v1/t17

    Summary of fit results for a parameterisation probing the ratios of coupling modifiers for leptons versus quarks. The results for...

  • Table 18

    Data from Fig 27

    10.17182/hepdata.78403.v1/t18

    Correlation matrix obtained from the fit combining the ATLAS and CMS data using the generic parameterisation with 23 parameters, $\sigma_i\cdot\mathrm{B}^f$...

  • Table 19

    Data from Fig 28

    10.17182/hepdata.78403.v1/t19

    Correlation matrix obtained from the fit combining the ATLAS and CMS data using the generic parameterisation with nine parameters, $\sigma(gg\to...

  • Table 20

    Data from Fig 29

    10.17182/hepdata.78403.v1/t20

    Correlation matrix obtained from the fit combining the ATLAS and CMS data using the generic parameterisation with seven parameters, $\kappa_{gZ}=\kappa_{g}\cdot\kappa_{Z}...

  • Table 21

    Data from Fig 34

    10.17182/hepdata.78403.v1/t21

    Expected correlation matrix obtained from the fit combining ATLAS and CMS pre-fit Asimov data sets using the generic parameterisation with...

  • Table 22

    Data from Fig 35

    10.17182/hepdata.78403.v1/t22

    Expected correlation matrix obtained from the fit combining ATLAS and CMS pre-fit Asimov data sets using the generic parameterisation with...

  • Table 23

    Data from Fig 36

    10.17182/hepdata.78403.v1/t23

    Expected correlation matrix obtained from the fit combining ATLAS and CMS pre-fit Asimov data sets using the generic parameterisation with...

  • Table 24

    Data from Fig 17

    10.17182/hepdata.78403.v1/t24

    ATLAS+CMS combined best-fit and 68% and 95% CL negative log-likelihood contours in the ($\kappa_{g}$,$\kappa_{\gamma}$) plane.

  • Table 25

    Data from Fig 17

    10.17182/hepdata.78403.v1/t25

    ATLAS best-fit and 68% and 95% CL negative log-likelihood contours in the ($\kappa_{g}$,$\kappa_{\gamma}$) plane.

  • Table 26

    Data from Fig 17

    10.17182/hepdata.78403.v1/t26

    CMS best-fit and 68% and 95% CL negative log-likelihood contours in the ($\kappa_{g}$,$\kappa_{\gamma}$) plane.

  • Table 27

    Data from Fig 24, Fig 26a, Fig 26b

    10.17182/hepdata.78403.v1/t27

    Best-fit and 68% and 95% CL negative log-likelihood contours in the ($\kappa_{F}$,$\kappa_{V}$) plane.

  • Table 28

    Data from Fig 24

    10.17182/hepdata.78403.v1/t28

    Best-fit and 68% CL negative log-likelihood contour in the ($\kappa_{F}$,$\kappa_{V}$) plane for the $H\rightarrow\gamma\gamma$ channel.

  • Table 29

    Data from Fig 24

    10.17182/hepdata.78403.v1/t29

    Best-fit and 68% CL negative log-likelihood contour in the ($\kappa_{F}$,$\kappa_{V}$) plane for the $H\rightarrow ZZ$ channel.

  • Table 30

    Data from Fig 24

    10.17182/hepdata.78403.v1/t30

    Best-fit and 68% CL negative log-likelihood contour in the ($\kappa_{F}$,$\kappa_{V}$) plane for the $H\rightarrow WW$ channel.

  • Table 31

    Data from Fig 24

    10.17182/hepdata.78403.v1/t31

    Best-fit and 68% CL negative log-likelihood contour in the ($\kappa_{F}$,$\kappa_{V}$) plane for the $H\rightarrow\tau\tau$ channel.

  • Table 32

    Data from Fig 24

    10.17182/hepdata.78403.v1/t32

    Best-fit and 68% CL negative log-likelihood contour in the ($\kappa_{F}$,$\kappa_{V}$) plane for the $H\rightarrow bb$ channel.

  • Table 33

    Data from Fig 26a

    10.17182/hepdata.78403.v1/t33

    ATLAS best-fit and 68% and 95% CL negative log-likelihood contours in the ($\kappa_{F}$,$\kappa_{V}$) plane.

  • Table 34

    Data from Fig 26a

    10.17182/hepdata.78403.v1/t34

    CMS best-fit and 68% and 95% CL negative log-likelihood contours in the ($\kappa_{F}$,$\kappa_{V}$) plane.

  • Table 35

    Data from Fig 26b

    10.17182/hepdata.78403.v1/t35

    Best-fit and 68% CL negative log-likelihood contour in the ($\kappa_{F}$,$\kappa_{V}$) plane for the $H\rightarrow\gamma\gamma$ channel, assuming $\kappa_{F}>0$.

  • Table 36

    Data from Fig 26b

    10.17182/hepdata.78403.v1/t36

    Best-fit and 68% CL negative log-likelihood contour in the ($\kappa_{F}$,$\kappa_{V}$) plane for the $H\rightarrow ZZ$ channel, assuming $\kappa_{F}>0$.

  • Table 37

    Data from Fig 26b

    10.17182/hepdata.78403.v1/t37

    Best-fit and 68% CL negative log-likelihood contour in the ($\kappa_{F}$,$\kappa_{V}$) plane for the $H\rightarrow WW$ channel, assuming $\kappa_{F}>0$.

  • Table 38

    Data from Fig 26b

    10.17182/hepdata.78403.v1/t38

    Best-fit and 68% CL negative log-likelihood contour in the ($\kappa_{F}$,$\kappa_{V}$) plane for the $H\rightarrow\tau\tau$ channel, assuming $\kappa_{F}>0$.

  • Table 39

    Data from Fig 26b

    10.17182/hepdata.78403.v1/t39

    Best-fit and 68% CL negative log-likelihood contour in the ($\kappa_{F}$,$\kappa_{V}$) plane for the $H\rightarrow bb$ channel, assuming $\kappa_{F}>0$.

  • Table 40

    Data from Fig 14, Fig 41

    10.17182/hepdata.78403.v1/t40

    Best-fit and 68% and 95% CL negative log-likelihood contours in the ($\mu^{f}_{gg\mathrm{F}+ttH}$,$\mu^{f}_{\mathrm{VBF}+VH}$) plane for the $H\rightarrow\gamma\gamma$ channel.

  • Table 41

    Data from Fig 14, Fig 41

    10.17182/hepdata.78403.v1/t41

    Best-fit and 68% and 95% CL negative log-likelihood contours in the ($\mu^{f}_{gg\mathrm{F}+ttH}$,$\mu^{f}_{\mathrm{VBF}+VH}$) plane for the $H\rightarrow ZZ$ channel.

  • Table 42

    Data from Fig 14, Fig 41

    10.17182/hepdata.78403.v1/t42

    Best-fit and 68% and 95% CL negative log-likelihood contours in the ($\mu^{f}_{gg\mathrm{F}+ttH}$,$\mu^{f}_{\mathrm{VBF}+VH}$) plane for the $H\rightarrow WW$ channel.

  • Table 43

    Data from Fig 14, Fig 41

    10.17182/hepdata.78403.v1/t43

    Best-fit and 68% and 95% CL negative log-likelihood contours in the ($\mu^{f}_{gg\mathrm{F}+ttH}$,$\mu^{f}_{\mathrm{VBF}+VH}$) plane for the $H\rightarrow\tau\tau$ channel.

  • Table 44

    Data from Fig 14, Fig 41

    10.17182/hepdata.78403.v1/t44

    Best-fit and 68% and 95% CL negative log-likelihood contours in the ($\mu^{f}_{gg\mathrm{F}+ttH}$,$\mu^{f}_{\mathrm{VBF}+VH}$) plane for the $H\rightarrow bb$ channel.

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