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| CMS-HIG-18-017 ; CERN-EP-2019-170 | ||
| Search for lepton flavour violating decays of a neutral heavy Higgs boson to $\mu\tau$ and e$\tau$ in proton-proton collisions at $\sqrt{s}=$ 13 TeV | ||
| CMS Collaboration | ||
| 23 November 2019 | ||
| JHEP 03 (2020) 103 | ||
| Abstract: A search for lepton flavour violating decays of a neutral non-standard-model Higgs boson in the $\mu\tau$ and e$\tau$ decay modes is presented. The search is based on proton-proton collisions at a center of mass energy $\sqrt{s}=$ 13 TeV collected with the CMS detector in 2016, corresponding to an integrated luminosity of 35.9 fb$^{-1}$ . The $\tau$ leptons are reconstructed in the leptonic and hadronic decay modes. No signal is observed in the mass range 200-900 GeV. At 95% confidence level, the observed (expected) upper limits on the production cross section multiplied by the branching fraction vary from 51.9 (57.4) fb to 1.6 (2.1) fb for the $\mu\tau$ and from 94.1 (91.6) fb to 2.3 (2.3) fb for the e$\tau$ decay modes. | ||
| Links: e-print arXiv:1911.10267 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
The ${M_{\text {col}}}$ distribution in the ${\mathrm{t} {}\mathrm{\bar{t}}} $ enriched (upper left), like-sign lepton (upper right), and W+jets enriched (lower) control samples defined in the text. The uncertainty bands include both statistical and systematic uncertainties from Section 7. No fit is performed for these distributions. |
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Figure 1-a:
The ${M_{\text {col}}}$ distribution in the ${\mathrm{t} {}\mathrm{\bar{t}}} $ enriched control sample defined in the text. The uncertainty bands include both statistical and systematic uncertainties from Section 7. No fit is performed for these distributions. |
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Figure 1-b:
The ${M_{\text {col}}}$ distribution in the like-sign lepton control sample defined in the text. The uncertainty bands include both statistical and systematic uncertainties from Section 7. No fit is performed for these distributions. |
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Figure 1-c:
The ${M_{\text {col}}}$ distribution in the W+jets enriched control sample defined in the text. The uncertainty bands include both statistical and systematic uncertainties from Section 7. No fit is performed for these distributions. |
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Figure 2:
The ${M_{\text {col}}}$ distribution in the signal region, for the $\mu {\tau _\mathrm {h}} $ (upper) and $\mu \tau _{\mathrm{e}} $ (lower) channels for the Higgs boson mass in the range 200-450 GeV for 0-jet (left) and 1-jet (right) categories. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
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Figure 2-a:
The ${M_{\text {col}}}$ distribution in the signal region, for the $\mu {\tau _\mathrm {h}} $ channel for the Higgs boson mass in the range 200-450 GeV for the 0-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
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Figure 2-b:
The ${M_{\text {col}}}$ distribution in the signal region, for the $\mu {\tau _\mathrm {h}} $ channel for the Higgs boson mass in the range 200-450 GeV for the 1-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
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Figure 2-c:
The ${M_{\text {col}}}$ distribution in the signal region, for the $\mu \tau _{\mathrm{e}} $ channel for the Higgs boson mass in the range 200-450 GeV for the 0-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
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Figure 2-d:
The ${M_{\text {col}}}$ distribution in the signal region, for the $\mu \tau _{\mathrm{e}} $ channel for the Higgs boson mass in the range 200-450 GeV for the 1-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 3:
The ${M_{\text {col}}}$ distribution in the signal region, for the $\mu {\tau _\mathrm {h}} $ (upper) and $\mu \tau _{\mathrm{e}} $ (lower) channels for the Higgs boson mass in the range 450-900 GeV for 0-jet (left) and 1-jet (right) categories. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 3-a:
The ${M_{\text {col}}}$ distribution in the signal region, for the $\mu {\tau _\mathrm {h}} $ channel for the Higgs boson mass in the range 450-900 GeV for the 0-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 3-b:
The ${M_{\text {col}}}$ distribution in the signal region, for the $\mu {\tau _\mathrm {h}} $ channel for the Higgs boson mass in the range 450-900 GeV for the 1-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 3-c:
The ${M_{\text {col}}}$ distribution in the signal region, for the $\mu \tau _{\mathrm{e}} $ channel for the Higgs boson mass in the range 450-900 GeV for the 0-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 3-d:
The ${M_{\text {col}}}$ distribution in the signal region, for the $\mu \tau _{\mathrm{e}} $ channel for the Higgs boson mass in the range 450-900 GeV for the 1-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 4:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to \mu \tau)$, for the $\mu {\tau _\mathrm {h}} $ (upper) and $\mu \tau _{\mathrm{e}} $ (lower) channels, for 0-jet (left) and 1-jet (right) categories. The dashed line shows the transition between the two investigated mass ranges. |
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Figure 4-a:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to \mu \tau)$, for the $\mu {\tau _\mathrm {h}} $ channel, for the 0-jet category. The dashed line shows the transition between the two investigated mass ranges. |
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Figure 4-b:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to \mu \tau)$, for the $\mu {\tau _\mathrm {h}} $ channel, for the 1-jet category. The dashed line shows the transition between the two investigated mass ranges. |
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Figure 4-c:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to \mu \tau)$, for the $\mu \tau _{\mathrm{e}} $ channel, for the 0-jet category. The dashed line shows the transition between the two investigated mass ranges. |
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Figure 4-d:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to \mu \tau)$, for the $\mu \tau _{\mathrm{e}} $ channel, for the 1-jet category. The dashed line shows the transition between the two investigated mass ranges. |
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Figure 5:
The combined observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to \mu \tau)$, for $\mu {\tau _\mathrm {h}} $ (upper left) and $\mu \tau _{\mathrm{e}} $ (lower right) channels, and their combination $\mu \tau $ (lower). The dashed line shows the transition between the two investigated mass ranges. |
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Figure 5-a:
The combined observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to \mu \tau)$, for the $\mu {\tau _\mathrm {h}} $ channel. The dashed line shows the transition between the two investigated mass ranges. |
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Figure 5-b:
The combined observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to \mu \tau)$, for the $\mu \tau _{\mathrm{e}} $ channel. The dashed line shows the transition between the two investigated mass ranges. |
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Figure 5-c:
The combined observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to \mu \tau)$, for the combination $\mu \tau $ of the $\mu {\tau _\mathrm {h}} $ and $\mu \tau _{\mathrm{e}} $ channels. The dashed line shows the transition between the two investigated mass ranges. |
png pdf |
Figure 6:
The ${M_{\text {col}}}$ distribution in the signal region, for the e$ {\tau _\mathrm {h}} $ (upper) and e$ \tau _\mu $ (lower) channels for the Higgs boson mass in the range 200-450 GeV for 0-jet (left) and 1-jet (right) categories. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 6-a:
The ${M_{\text {col}}}$ distribution in the signal region, for the e$ {\tau _\mathrm {h}} $ channel for the Higgs boson mass in the range 200-450 GeV for the 0-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 6-b:
The ${M_{\text {col}}}$ distribution in the signal region, for the e$ {\tau _\mathrm {h}} $ channel for the Higgs boson mass in the range 200-450 GeV for the 1-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 6-c:
The ${M_{\text {col}}}$ distribution in the signal region, for the e$ \tau _\mu $ channel for the Higgs boson mass in the range 200-450 GeV for the 0-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 6-d:
The ${M_{\text {col}}}$ distribution in the signal region, for the e$ \tau _\mu $ channel for the Higgs boson mass in the range 200-450 GeV for the 1-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 7:
The ${M_{\text {col}}}$ distribution in the signal region, for the e$ {\tau _\mathrm {h}} $ (upper) and e$ \tau _\mu $ (lower) channels for the Higgs boson mass in the range 450-900 GeV for 0-jet (left) and 1-jet (right) categories. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 7-a:
The ${M_{\text {col}}}$ distribution in the signal region, for the e$ {\tau _\mathrm {h}} $ channel for the Higgs boson mass in the range 450-900 GeV for the 0-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 7-b:
The ${M_{\text {col}}}$ distribution in the signal region, for the e$ {\tau _\mathrm {h}} $ channel for the Higgs boson mass in the range 450-900 GeV for the 1-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 7-c:
The ${M_{\text {col}}}$ distribution in the signal region, for the e$ \tau _\mu $ channel for the Higgs boson mass in the range 450-900 GeV for the 0-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 7-d:
The ${M_{\text {col}}}$ distribution in the signal region, for the e$ \tau _\mu $ channel for the Higgs boson mass in the range 450-900 GeV for the 1-jet category. The uncertainty bands include both statistical and systematic uncertainties. The plotted values are number of events per bin using a variable bin size. The background is normalised to the best fit values from a binned likelihood fit, discussed in the text, to the background only hypothesis. For depicting the signals a branching fraction of 1% and BSM cross sections from Ref. [78] are assumed. |
png pdf |
Figure 8:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to {\mathrm{e}} \tau)$, for the e$ {\tau _\mathrm {h}} $ (upper) and e$ \tau _\mu $ (lower) channels, for 0-jet (left) and 1-jet (right) categories. The dashed line shows the transition between the two investigated mass ranges. |
png pdf |
Figure 8-a:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to {\mathrm{e}} \tau)$, for the e$ {\tau _\mathrm {h}} $ channel, for the 0-jet category. The dashed line shows the transition between the two investigated mass ranges. |
png pdf |
Figure 8-b:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to {\mathrm{e}} \tau)$, for the e$ {\tau _\mathrm {h}} $ channel, for the 1-jet category. The dashed line shows the transition between the two investigated mass ranges. |
png pdf |
Figure 8-c:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to {\mathrm{e}} \tau)$, for the e$ \tau _\mu $ channel, for the 0-jet category. The dashed line shows the transition between the two investigated mass ranges. |
png pdf |
Figure 8-d:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to {\mathrm{e}} \tau)$, for the e$ \tau _\mu $ channel, for the 1-jet category. The dashed line shows the transition between the two investigated mass ranges. |
png pdf |
Figure 9:
The combined observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to {\mathrm{e}} \tau)$, for e$ {\tau _\mathrm {h}} $ (upper left) and e$ \tau _\mu $ (upper right) channels, and their combination e$ \tau $ (lower). The dashed line shows the transition between the two investigated mass ranges. |
png pdf |
Figure 9-a:
The combined observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to {\mathrm{e}} \tau)$, for the e$ {\tau _\mathrm {h}} $ channel. The dashed line shows the transition between the two investigated mass ranges. |
png pdf |
Figure 9-b:
The combined observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to {\mathrm{e}} \tau)$, for the e$ \tau _\mu $ channel. The dashed line shows the transition between the two investigated mass ranges. |
png pdf |
Figure 9-c:
The combined observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to {\mathrm{e}} \tau)$, for the combination e$ \tau $ of the e$ {\tau _\mathrm {h}} $ and e$ \tau _\mu $ channels. The dashed line shows the transition between the two investigated mass ranges. |
| Tables | |
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Table 1:
Initial selection criteria applied to the kinematic variables for the ${\mathrm{H} \to \mu \tau} $ and ${\mathrm{H} \to {\mathrm{e}} \tau} $ analyses. The selected sample is used in the background estimation from control samples in data. |
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Table 2:
Final event selection criteria for the low-mass range, 200 $ < m_{\mathrm{H}} < $ 450 GeV, and the high-mass range, 450 $ < m_{\mathrm{H}} < $ 900 GeV, considered in the ${\mathrm{H} \to \mu \tau} $ and ${\mathrm{H} \to {\mathrm{e}} \tau} $ analyses. |
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Table 3:
The systematic uncertainties for the four channels. All uncertainties are treated as correlated between the categories, except those with more values separated by the $\oplus $ symbol. In the case of two values, the first value is the correlated uncertainty and the second value is the uncorrelated uncertainty for each individual category. In the case of three values, the first and second values correspond to the uncertainties arising from factorisation and renormalisation scales and PDF variations and are correlated between categories, while the third value is the uncorrelated uncertainty for each individual category. Two values separated by the "-" sign represent the range of the uncertainties from the different sources and/or in the different jet categories. |
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Table 4:
Theoretical uncertainties from [78] are applied to the Higgs boson production cross sections for the different masses. In the reference, the PDF and $ {\alpha _S} $ uncertainties are computed following the recommendation of the PDF4LHC working group. The remaining Gaussian uncertainty accounts for additional intrinsic sources of theory uncertainty described in detail in the reference. |
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Table 5:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H}) \mathcal {B}(\mathrm{H} \to \mu \tau)$. |
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Table 6:
The observed and median expected 95% CL upper limits on $\sigma (\mathrm{g} \mathrm{g} \to \mathrm{H})\mathcal {B}(\mathrm{H} \to {\mathrm{e}} \tau)$. |
| Summary |
| The first direct search for lepton flavour violating decays of a neutral non-standard-model Higgs boson (H) in the $\mu\tau$ and e$\tau$ channels is presented in this paper. The analyzed data set corresponds to an integrated luminosity of 35.9 fb$^{-1}$ of proton-proton collision data recorded at $\sqrt{s}=$ 13 TeV. The results are extracted from a fit to the collinear mass distributions. No evidence is found for lepton flavour violating decays of $\mathrm{H}$ in the investigated mass range. The observed (expected) upper limits at 95% confidence level on the product of production cross section with branching fraction, for $\mathrm{H}$ mass in the range 200-900 GeV, decaying to $\mu\tau$ and e$\tau$ vary from 51.9 (57.4) fb to 1.6 (2.1) fb and from 94.1 (91.6) fb to 2.3 (2.3) fb, respectively. |
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