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| CMS-HIG-18-021 ; CERN-EP-2020-057 | ||
| Search for a light charged Higgs boson in the $ \mathrm{H}^{\pm} \to \mathrm{c}\mathrm{s}$ channel in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 18 May 2020 | ||
| Phys. Rev. D 102 (2020) 072001 | ||
| Abstract: A search is conducted for a low-mass charged Higgs boson produced in a top quark decay and subsequently decaying into a charm and a strange quark. The data sample was recorded in proton-proton collisions at $\sqrt{s} = $ 13 TeV by the CMS experiment at the LHC and corresponds to an integrated luminosity of 35.9 fb$^{-1}$. The search is performed in the process of top quark pair production, where one top quark decays to a bottom quark and a charged Higgs boson, and the other to a bottom quark and a W boson. With the W boson decaying to a charged lepton (electron or muon) and a neutrino, the final state comprises an isolated lepton, missing transverse momentum, and at least four jets, of which two are tagged as b jets. To enhance the search sensitivity, one of the jets originating from the charged Higgs boson is required to satisfy a charm tagging selection. No significant excess beyond standard model predictions is found in the dijet invariant mass distribution. An upper limit in the range 1.68-0.25% is set on the branching fraction of the top quark decay to the charged Higgs boson and bottom quark for a charged Higgs boson mass between 80 and 160 GeV. | ||
| Links: e-print arXiv:2005.08900 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Sample diagrams of ${\mathrm{t} \mathrm{\bar{t}}}$ production via gluon-gluon scattering. The left plot shows the signal process in which the ${\mathrm{t} \mathrm{\bar{t}}}$ pair decay products include a charged Higgs boson. The right plot shows the SM decay of a ${\mathrm{t} \mathrm{\bar{t}}}$ pair in the semileptonic decay channel. |
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Figure 2:
Distributions of ${m_\text {jj}}$, prior to the fit to data, of the two highest ${p_{\mathrm {T}}}$ non-b jets for the muon+jets channel (left column) and the electron+jets channel (right column). The two distributions in the upper row are obtained using reconstructed jets. The distributions in the lower row are calculated using jets after the kinematic fit. The uncertainty band (showing the absolute uncertainty in the upper panels, and the relative uncertainty in the lower panels) includes both statistical and systematic components. The signal events are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 2-a:
Distributions of ${m_\text {jj}}$, prior to the fit to data, of the two highest ${p_{\mathrm {T}}}$ non-b jets for the muon+jets channel. The distribution is obtained using reconstructed jets. The uncertainty band (showing the absolute uncertainty in the upper panel, and the relative uncertainty in the lower panel) includes both statistical and systematic components. The signal events are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 2-b:
Distributions of ${m_\text {jj}}$, prior to the fit to data, of the two highest ${p_{\mathrm {T}}}$ non-b jets for the electron+jets channel. The distribution is obtained using reconstructed jets. The uncertainty band (showing the absolute uncertainty in the upper panel, and the relative uncertainty in the lower panel) includes both statistical and systematic components. The signal events are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 2-c:
Distributions of ${m_\text {jj}}$, prior to the fit to data, of the two highest ${p_{\mathrm {T}}}$ non-b jets for the muon+jets channel. The distribution is calculated using jets after the kinematic fit. The uncertainty band (showing the absolute uncertainty in the upper panel, and the relative uncertainty in the lower panel) includes both statistical and systematic components. The signal events are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 2-d:
Distributions of ${m_\text {jj}}$, prior to the fit to data, of the two highest ${p_{\mathrm {T}}}$ non-b jets for the electron+jets channel. The distribution is calculated using jets after the kinematic fit. The uncertainty band (showing the absolute uncertainty in the upper panel, and the relative uncertainty in the lower panel) includes both statistical and systematic components. The signal events are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 3:
Distributions of ${m_\text {jj}}$, after a background-only fit to the data, in the exclusive charm tagging categories for the muon+jets (left column) and electron+jets (right column) channels. The upper row shows the exclusive loose category, the middle row shows the exclusive medium category, and the lower row shows the exclusive tight category. The expected signal significance (prior to the fit) can be observed to vary across the different categories. The uncertainty band (showing the absolute uncertainty in the upper panels, and the relative uncertainty in the lower panels) includes both statistical and systematic components after the background-only fit. The signal distributions are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 3-a:
Distribution of ${m_\text {jj}}$, after a background-only fit to the data, for the muon+jets channel in the exclusive loose charm tagging category. The expected signal significance (prior to the fit) can be observed to vary across the different categories. The uncertainty band (showing the absolute uncertainty in the upper panels, and the relative uncertainty in the lower panels) includes both statistical and systematic components after the background-only fit. The signal distributions are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 3-b:
Distribution of ${m_\text {jj}}$, after a background-only fit to the data, for the electron+jets channel in the exclusive loose charm tagging category. The expected signal significance (prior to the fit) can be observed to vary across the different categories. The uncertainty band (showing the absolute uncertainty in the upper panels, and the relative uncertainty in the lower panels) includes both statistical and systematic components after the background-only fit. The signal distributions are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 3-c:
Distribution of ${m_\text {jj}}$, after a background-only fit to the data, for the muon+jets channel in the exclusive medium charm tagging category. The expected signal significance (prior to the fit) can be observed to vary across the different categories. The uncertainty band (showing the absolute uncertainty in the upper panels, and the relative uncertainty in the lower panels) includes both statistical and systematic components after the background-only fit. The signal distributions are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 3-d:
Distribution of ${m_\text {jj}}$, after a background-only fit to the data, for the electron+jets channel in the exclusive medium charm tagging category. The expected signal significance (prior to the fit) can be observed to vary across the different categories. The uncertainty band (showing the absolute uncertainty in the upper panels, and the relative uncertainty in the lower panels) includes both statistical and systematic components after the background-only fit. The signal distributions are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 3-e:
Distribution of ${m_\text {jj}}$, after a background-only fit to the data, for the muon+jets channel in the exclusive tight charm tagging category. The expected signal significance (prior to the fit) can be observed to vary across the different categories. The uncertainty band (showing the absolute uncertainty in the upper panels, and the relative uncertainty in the lower panels) includes both statistical and systematic components after the background-only fit. The signal distributions are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 3-f:
Distribution of ${m_\text {jj}}$, after a background-only fit to the data, for the electron+jets channel in the exclusive tight charm tagging category. The expected signal significance (prior to the fit) can be observed to vary across the different categories. The uncertainty band (showing the absolute uncertainty in the upper panels, and the relative uncertainty in the lower panels) includes both statistical and systematic components after the background-only fit. The signal distributions are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Figure 4:
The expected and observed upper limit in % on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ as a function of $ {m_{\mathrm{H}^{+}}} $ using ${m_\text {jj}}$ after the individual charm tagging categories have been combined, for the muon+jets (upper left) and electron+jets (upper right) channels, and their combination (lower). |
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Figure 4-a:
The expected and observed upper limit in % on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ as a function of $ {m_{\mathrm{H}^{+}}} $ using ${m_\text {jj}}$ after the individual charm tagging categories have been combined, for the muon+jets channel. |
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Figure 4-b:
The expected and observed upper limit in % on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ as a function of $ {m_{\mathrm{H}^{+}}} $ using ${m_\text {jj}}$ after the individual charm tagging categories have been combined, for the electron+jets channel. |
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Figure 4-c:
The expected and observed upper limit in % on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ as a function of $ {m_{\mathrm{H}^{+}}} $ using ${m_\text {jj}}$ after the individual charm tagging categories have been combined, for the combination of muon+jets and electron+jets channels. |
| Tables | |
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Table 1:
The efficiency of the c jet tagger to tag a jet from a c quark ($\epsilon ^{\mathrm{c}}$), a b quark ($\epsilon ^{\mathrm{b}}$), or light flavor ($\epsilon ^{\mathrm{u} \mathrm{d} \mathrm{s} \mathrm{g}}$) at different working points, as determined from simulation [54]. |
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Table 2:
Expected event yields for different signal mass scenarios and backgrounds in each of the channels and event categories. The number of events is shown along with its uncertainty, including statistical and systematic effects. The yields of the background processes are obtained after a background-only fit to the data. The total uncertainty in the background process is calculated by taking into account all the positive as well as negative correlations among the fit parameters. The signal event yields are scaled by twice the maximum observed upper limit on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ obtained at 8 TeV [23]. |
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Table 3:
Systematic and statistical uncertainties in the event yield for the different processes in %, prior to the fit to data, for the exclusive charm categories in the muon (electron) channel. The "---'' indicates that the corresponding uncertainties are either not considered for the given process, or too small to be measured. |
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Table 4:
Expected and observed 95% CL exclusion limits in % on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$ in the muon+jets (electron+jets) channel, after the individual charm tagging categories have been combined. |
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Table 5:
Expected and observed 95% CL exclusion limits in % on ${\mathcal {B}(\mathrm{t} \to \mathrm{H}^{+} \mathrm{b})}$, after the individual charm tagging categories and the muon and electron channels have been combined. |
| Summary |
| A search for a light charged Higgs boson produced by top quark decay has been performed in the muon+jets and electron+jets channels at $\sqrt{s} = $ 13 TeV, using a data sample corresponding to an integrated luminosity of 35.9 fb$^{-1}$. The observed and predicted number of events from standard model processes are in agreement within the uncertainties. An exclusion limit at 95% confidence level on the branching fraction ${\mathcal{B}(\mathrm{t} \to \mathrm{H}^{+}\mathrm{b})}$ has been computed by assuming ${\mathcal{B}(\mathrm{H}^{+} \to \mathrm{c}\mathrm{\bar{s}})} = $ 100%. The observed exclusion limits are in the range, for a charged Higgs boson mass between 80 and 160 GeV, 2.44-0.32, 2.77-0.26, and 1.68-0.25% for the muon+jets, electron+jets, and the combination of the two channels, respectively. These are the first results from the LHC at $\sqrt{s} = $ 13 TeV for the above final states, and represent an improvement by a factor of approximately 4 over the previous results at $\sqrt{s} = $ 8 TeV. |
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