CMS-HIG-18-014 ; CERN-EP-2019-025 | ||
Search for charged Higgs bosons in the $\mathrm{H}^{\pm} \to \tau^{\pm}\nu_\tau$ decay channel in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
CMS Collaboration | ||
11 March 2019 | ||
JHEP 07 (2019) 142 | ||
Abstract: A search is presented for charged Higgs bosons in the $\mathrm{H}^{\pm} \to \tau^{\pm}\nu_\tau$ decay mode in the hadronic final state and in final states with an electron or muon. The search is based on proton-proton collision data recorded by the CMS experiment in 2016 at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The results agree with the background expectation from the standard model. Upper limits at 95% confidence level are set on the production cross section times branching fraction to $\tau^{\pm}\nu_\tau$ for an $ \mathrm{H}^{\pm}$ in the mass range of 80 GeV to 3 TeV, including the region near the top quark mass. The observed limit ranges from 6 pb at 80 GeV to 5 fb at 3 TeV. The limits are interpreted in the context of the minimal supersymmetric standard model ${m_{\mathrm{h}}^\text{mod-}}$ scenario. | ||
Links: e-print arXiv:1903.04560 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; |
Figures | |
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Figure 1:
Leading order diagrams describing charged Higgs boson production. Double-resonant top quark production (left) is the dominant process for light ${\mathrm {H}^{\pm}}$, whereas the single-resonant top quark production (middle) dominates for heavy ${\mathrm {H}^{\pm}}$ masses. For the intermediate region (${{m_{{\mathrm {H}} ^\pm}} \sim {m_{{\mathrm {t}}}}}$), both production modes and their interplay with the nonresonant top quark production (right) must be taken into account. Charge-conjugate processes are implied. |
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Figure 1-a:
Leading order diagram describing charged Higgs boson production. Double-resonant top quark production is the dominant process for light ${\mathrm {H}^{\pm}}$. Charge-conjugate processes are implied. |
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Figure 1-b:
Leading order diagram describing charged Higgs boson production. The single-resonant top quark production dominates for heavy ${\mathrm {H}^{\pm}}$ masses. Charge-conjugate processes are implied. |
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Figure 1-c:
Leading order diagram describing charged Higgs boson production. The nonresonant top quark production must also be taken into account for the intermediate region (${{m_{{\mathrm {H}} ^\pm}} \sim {m_{{\mathrm {t}}}}}$). Charge-conjugate processes are implied. |
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Figure 2:
The distribution of the angular discriminant $ {R_{\text {bb}}^\text {min}} $ after all other selections including the $ {R_ {\tau}} = {{{p_{\mathrm {T}}} ^{\text {track}}}/ {p_{\mathrm {T}}} ^{{{\tau} _\mathrm {h}}}} > $ 0.75 requirement have been applied (left), and the distribution of the $ {R_ {\tau}} $ variable used for categorization after all other selections including the $ {R_{\text {bb}}^\text {min}} > 40^{\circ}$ requirement have been applied (right). |
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Figure 2-a:
The distribution of the angular discriminant $ {R_{\text {bb}}^\text {min}} $ after all other selections including the $ {R_ {\tau}} = {{{p_{\mathrm {T}}} ^{\text {track}}}/ {p_{\mathrm {T}}} ^{{{\tau} _\mathrm {h}}}} > $ 0.75 requirement have been applied. |
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Figure 2-b:
The distribution of the $ {R_ {\tau}} $ variable used for categorization after all other selections including the $ {R_{\text {bb}}^\text {min}} > 40^{\circ}$ requirement have been applied. |
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Figure 3:
The transverse mass distributions in the $ {{{\tau} _\mathrm {h}}} $+jets final state after a background-only fit to the data. Left: category defined by $R_ {\tau} < $ 0.75. Transverse mass values up to 5 TeV are considered in the fit, but the last bins with $ {m_{\mathrm {T}}} > $ 650 GeV do not contain any observed events. Right: category defined by $R_ {\tau} > $ 0.75. The last bin shown extends to 5 TeV. |
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Figure 3-a:
The transverse mass distribution in the $ {{{\tau} _\mathrm {h}}} $+jets final state after a background-only fit to the data in the category defined by $R_ {\tau} < $ 0.75. Transverse mass values up to 5 TeV are considered in the fit, but the last bins with $ {m_{\mathrm {T}}} > $ 650 GeV do not contain any observed events. |
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Figure 3-b:
The transverse mass distribution in the $ {{{\tau} _\mathrm {h}}} $+jets final state after a background-only fit to the data in the category defined by $R_ {\tau} > $ 0.75. The last bin shown extends to 5 TeV. |
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Figure 4:
The transverse mass distributions for two ${\ell} $+$ {{{\tau} _\mathrm {h}}} $ categories with high signal sensitivity after a background-only fit to the data. Left: category with one electron, one ${{\tau} _\mathrm {h}}$, one jet identified as a b jet, and $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 150 GeV. Right: category with one muon, one ${{\tau} _\mathrm {h}}$, one jet identified as a b jet and 100 $ < {{p_{\mathrm {T}}} ^\text {miss}} < $ 150 GeV. In both categories, the last bin shown extends to 5 TeV. |
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Figure 4-a:
The transverse mass distribution after a background-only fit to the data for the high-signal-sensitivity ${\ell} $+$ {{{\tau} _\mathrm {h}}} $ category with one electron, one ${{\tau} _\mathrm {h}}$, one jet identified as a b jet, and $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 150 GeV. The last bin shown extends to 5 TeV. |
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Figure 4-b:
The transverse mass distribution after a background-only fit to the data for the high-signal-sensitivity ${\ell} $+$ {{{\tau} _\mathrm {h}}} $ category with one muon, one ${{\tau} _\mathrm {h}}$, one jet identified as a b jet and 100 $ < {{p_{\mathrm {T}}} ^\text {miss}} < $ 150 GeV. The last bin shown extends to 5 TeV. |
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Figure 5:
The ${m_{\mathrm {T}}}$ distributions for two ${\ell} $+no $ {{{\tau} _\mathrm {h}}} $ categories with high signal sensitivity after a background-only fit to the data. Left: category with one electron, no ${{\tau} _\mathrm {h}}$, two jets (one identified as a b jet), and $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 150 GeV. Right: category with one muon, no ${{\tau} _\mathrm {h}}$, two jets (one identified as a b jet) and $ {{p_{\mathrm {T}}} ^\text {miss}} < $ 150 GeV. In both categories, the last bin shown extends to 5 TeV. |
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Figure 5-a:
The ${m_{\mathrm {T}}}$ distribution after a background-only fit to the data for the high-signal-sensitivity ${\ell} $+no $ {{{\tau} _\mathrm {h}}} $ category with one electron, no ${{\tau} _\mathrm {h}}$, two jets (one identified as a b jet), and $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 150 GeV. The last bin shown extends to 5 TeV. |
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Figure 5-b:
The ${m_{\mathrm {T}}}$ distribution after a background-only fit to the data for the high-signal-sensitivity ${\ell} $+no $ {{{\tau} _\mathrm {h}}} $ category with one muon, no ${{\tau} _\mathrm {h}}$, two jets (one identified as a b jet) and $ {{p_{\mathrm {T}}} ^\text {miss}} < $ 150 GeV. The last bin shown extends to 5 TeV. |
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Figure 6:
The observed 95% CL exclusion limits on ${{\sigma _{{\mathrm {H}} ^\pm}} {\mathcal {B}({{\mathrm {H}} ^{\pm}\to {\tau}^{\pm} {\nu _{\tau}}})}}$ (solid black points), compared to the expected limit assuming only standard model processes (dashed line) for the ${\mathrm {H}^{\pm}}$ mass range from 80 GeV to 3 TeV (left), and the same limit interpreted in the ${m_{{\mathrm {h}}}^\text {mod-}}$ benchmark scenario (right). The green (yellow) bands represent one (two) standard deviations from the expected limit. On the left, the horizontal axis is linear from 80 to 180 GeV and logarithmic for larger $ {m_{{\mathrm {H}} ^\pm}}$ values. On the right, the region below the red line is excluded assuming that the observed neutral Higgs boson is the light CP-even 2HDM Higgs boson with a mass of 125 $\pm$ 3 GeV, where the uncertainty is the theoretical uncertainty in the mass calculation. |
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Figure 6-a:
The observed 95% CL exclusion limits on ${{\sigma _{{\mathrm {H}} ^\pm}} {\mathcal {B}({{\mathrm {H}} ^{\pm}\to {\tau}^{\pm} {\nu _{\tau}}})}}$ (solid black points), compared to the expected limit assuming only standard model processes (dashed line) for the ${\mathrm {H}^{\pm}}$ mass range from 80 GeV to 3 TeV. The green (yellow) bands represent one (two) standard deviations from the expected limit. The horizontal axis is linear from 80 to 180 GeV and logarithmic for larger $ {m_{{\mathrm {H}} ^\pm}}$ values. |
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Figure 6-b:
The observed 95% CL exclusion limits on ${{\sigma _{{\mathrm {H}} ^\pm}} {\mathcal {B}({{\mathrm {H}} ^{\pm}\to {\tau}^{\pm} {\nu _{\tau}}})}}$ (solid black points), compared to the expected limit assuming only standard model processes (dashed line) for the ${\mathrm {H}^{\pm}}$ mass range from 80 GeV to 3 TeV, interpreted in the ${m_{{\mathrm {h}}}^\text {mod-}}$ benchmark scenario. The green (yellow) bands represent one (two) standard deviations from the expected limit. The region below the red line is excluded assuming that the observed neutral Higgs boson is the light CP-even 2HDM Higgs boson with a mass of 125 $\pm$ 3 GeV, where the uncertainty is the theoretical uncertainty in the mass calculation. |
Tables | |
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Table 1:
Effect of systematic uncertainties on the final event yields in per cent, prior to the fit, summed over all final states and categories. For the ${\mathrm {H}^{\pm}}$ signal, the values for $ {m_{{\mathrm {H}} ^\pm}} = $ 200 GeV are shown. |
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Table 2:
Number of expected and observed events for the three final states after all selections, summed over all categories in each final state. For background processes, the event yields after a background-only fit and the corresponding uncertainties are shown. For the ${\mathrm {H}^{\pm}}$ mass hypotheses of 100, 200, and 2000 GeV, the signal yields are normalized to an ${\mathrm {H}^{\pm}}$ production cross section of 1 pb and the total systematic uncertainties (prior to the fit) are shown. |
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Table 3:
The expected and observed 95% CL exclusion limits on ${{\sigma _{{\mathrm {H}} ^\pm}} {\mathcal {B}({{\mathrm {H}} ^{\pm}\to {\tau}^{\pm} {\nu _{\tau}}})}}$ for the ${\mathrm {H}^{\pm}}$ mass range from 80 GeV to 3 TeV. The $ \pm $1 s.d. ($ \pm $2 s.d.) refers to one (two) standard deviations from the expected limit. |
Summary |
A search is presented for charged Higgs bosons decaying as ${ \mathrm{H}^{\pm} \to \tau^{\pm} \nu_{\tau} }$, using events recorded by the CMS experiment in 2016 at a center-of-mass energy of 13 TeV. Transverse mass distributions are reconstructed in hadronic and leptonic final states and are found to agree with the standard model expectation. Upper limits for the product of the ${ \mathrm{H}^{\pm} }$ production cross section and the branching fraction to ${ \tau^{\pm} \nu_{\tau} }$ are set at 95% confidence level for an ${ \mathrm{H}^{\pm} }$ mass ranging from 80 GeV to 3 TeV, including the range close to the top quark mass. The observed limit ranges from 6 pb at 80 GeV to 5 fb at 3 TeV. The results are interpreted as constraints in the parameter space of the minimal supersymmetric standard model ${m_{\mathrm{h}}^\text{mod-}}$ benchmark scenario. In this scenario, all $ \tan\beta $ values from 1 to 60 are excluded for charged Higgs boson masses up to 160 GeV. |
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Compact Muon Solenoid LHC, CERN |