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| CMS-PAS-HIG-18-020 | ||
| Search for a light charged Higgs boson decaying to a W boson and a CP-odd Higgs boson in $\mathrm{e}\mu\mu$/$\mu\mu\mu$ + jets channels in proton-proton collisions at $\sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| March 2019 | ||
| Abstract: A search for a light charged Higgs boson ($\mathrm{H}^{+}$) decaying to a W boson and a CP-odd Higgs boson (A) is performed using data from proton-proton collisions at $\sqrt{s}= $ 13 TeV. The data were recorded by the CMS detector at the LHC in 2016 and correspond to an integrated luminosity of 35.9 fb$^{-1}$. In this search, it is assumed that the $\mathrm{H}^{+}$ boson is produced in decays of top quarks, and the A boson decays to two opposite-charge muons. The presence of signals for $\mathrm{H}^{+}$ boson masses between 100 and 160 GeV and A boson masses between 15 and 75 GeV is investigated. No evidence for the production of the $\mathrm{H}^{+}$ boson is found. Assuming branching ratios $\mathcal{B}(\mathrm{H}^{+}\to\mathrm{W}^{+}\mathrm{A})=$ 1 and $\mathcal{B}(\mathrm{A}\to\mu^{+}\mu^{-})=3\times10^{-4}$, upper limits at 95% confidence level on the branching fraction of the top quark, $\mathcal{B}(\mathrm{t}\to\mathrm{b}\mathrm{H}^{+})$, of 0.63 to 2.9% are obtained, depending on the masses of the $\mathrm{H}^{+}$ and A bosons. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, PRL 123 (2019) 131802. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
The Feynman diagram of signal processes ($\ell = {\mathrm {e}}, {{\mu}}$, $ {\mathrm {W}} {\mathrm {W}}\to \ell {\nu} {\mathrm {q}} {\overline {\mathrm {q}}}^{\prime}$). |
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Figure 2:
The $ {m}_{{{\mu}} {{\mu}}}$ distribution of candidate muon pairs from A bosons (left) and the event yields in each signal window (right) in the $ {\mathrm {e}} {{\mu}} {{\mu}}$ and $ {{\mu}} {{\mu}} {{\mu}}$ final states. A constant bin size (1 GeV) is used in the left figure except the last bin of $[80,\ 81.2]$ (GeV). Values of $ {m}_{{{\mu}} {{\mu}}}$ at centers of windows are written in the parentheses on the $x$ axis of the right figure. The expected signal distribution for $ {m}_{{\mathrm {H}} ^{+}}=$ 130 and $ {m}_{{\mathrm {A}}} = $ 45 GeV is also shown on top of the expected backgrounds assuming $\sigma ({{\mathrm {t}\overline {\mathrm {t}}}})=$ 832 pb, $\mathcal {B}({\mathrm {t}}\to {\mathrm {b}}{{\mathrm {H}} ^{+}})=$ 0.02, $\mathcal {B}({\mathrm {H}} ^{+}\to {\mathrm {W^+}} {\mathrm {A}})=$ 1, and $\mathcal {B}({\mathrm {A}} \to {{{\mu ^+}} {{\mu ^-}}})=3\times 10^{-4}$. |
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Figure 2-a:
The $ {m}_{{{\mu}} {{\mu}}}$ distribution of candidate muon pairs from A bosons in the $ {\mathrm {e}} {{\mu}} {{\mu}}$ and $ {{\mu}} {{\mu}} {{\mu}}$ final states. A constant bin size (1 GeV) is used except the last bin of $[80,\ 81.2]$ (GeV). The expected signal distribution for $ {m}_{{\mathrm {H}} ^{+}}=$ 130 and $ {m}_{{\mathrm {A}}} = $ 45 GeV is also shown on top of the expected backgrounds assuming $\sigma ({{\mathrm {t}\overline {\mathrm {t}}}})=$ 832 pb, $\mathcal {B}({\mathrm {t}}\to {\mathrm {b}}{{\mathrm {H}} ^{+}})=$ 0.02, $\mathcal {B}({\mathrm {H}} ^{+}\to {\mathrm {W^+}} {\mathrm {A}})=$ 1, and $\mathcal {B}({\mathrm {A}} \to {{{\mu ^+}} {{\mu ^-}}})=3\times 10^{-4}$. |
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Figure 2-b:
The event yields in each signal window in the $ {\mathrm {e}} {{\mu}} {{\mu}}$ and $ {{\mu}} {{\mu}} {{\mu}}$ final states. Values of $ {m}_{{{\mu}} {{\mu}}}$ at centers of windows are written in the parentheses on the $x$ axis. The expected signal distribution for $ {m}_{{\mathrm {H}} ^{+}}=$ 130 and $ {m}_{{\mathrm {A}}} = $ 45 GeV is also shown on top of the expected backgrounds assuming $\sigma ({{\mathrm {t}\overline {\mathrm {t}}}})=$ 832 pb, $\mathcal {B}({\mathrm {t}}\to {\mathrm {b}}{{\mathrm {H}} ^{+}})=$ 0.02, $\mathcal {B}({\mathrm {H}} ^{+}\to {\mathrm {W^+}} {\mathrm {A}})=$ 1, and $\mathcal {B}({\mathrm {A}} \to {{{\mu ^+}} {{\mu ^-}}})=3\times 10^{-4}$. |
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Figure 3:
Expected and observed upper limits at 95% CL on $\mathcal {B}({\mathrm {t}}\to {\mathrm {b}}{{\mathrm {H}} ^{+}})$ at each point of $ {m}_{{\mathrm {A}}}$ along $ {m}_{{\mathrm {H}} ^{+}}= {m}_{{\mathrm {A}}}$ + 85 GeV. The same values of $\mathcal {B}({\mathrm {H}} ^{+}\to {\mathrm {W^+}} {\mathrm {A}})$, $\mathcal {B}({\mathrm {A}} \to {{{\mu ^+}} {{\mu ^-}}})$, and $\sigma ({{\mathrm {t}\overline {\mathrm {t}}}})$ as in Fig. 2 are assumed. The green (yellow) bands indicate the regions containing 68 (95)% of the limit values expected under the background-only hypothesis. The dependence of the limits on $ {m}_{{\mathrm {H}} ^{+}}$ is shown with the expected limit at $ {m}_{{\mathrm {H}} ^{+}} = $ 160 GeV. |
| Tables | |
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Table 1:
Summary of mass windows ($ {| {m}_{{{\mu}} {{\mu}}}- {m}_{{\mathrm {A}}} |} < w$) for each $ {m}_{{\mathrm {A}}}$ hypothesis. |
| Summary |
| In summary, a search is performed for a charged Higgs boson, produced in the decay of a top quark, and decaying further into a W boson and a pseudoscalar Higgs boson A, where the A boson decays to two muons. The analysis uses proton-proton collision data at $\sqrt{s} = $ 13 TeV, recorded by the CMS experiment, corresponding to an integrated luminosity of 35.9 fb$^{-1}$. A resonant signature in the dimuon mass spectrum is searched in the trilepton events for the ranges of $m_{\mathrm{A}}$ between 15 and 75 GeV and $m_{\mathrm{H}^{+}}$ between $m_{\mathrm{A}}$ + 85 GeV and 160 GeV. No statistically significant excess is found in the distribution, and upper limits on the branching fraction of top quarks, $\mathcal{B}(\mathrm{t}\to \mathrm{b}{\mathrm{H}^{+}})$, are set at 95% confidence level in the aforementioned mass ranges, assuming $\sigma(\mathrm{t\bar{t}}) =$ 832 pb, $\mathcal{B}( {\mathrm{H}^{+}} \to \mathrm{W}^{+}\mathrm{A}) =$ 1, and $\mathcal{B}( \mathrm{A} \to \mu^{+}\mu^{-}) = 3 \times 10^{-4}$. The reported analysis constitutes the first search for the ${\mathrm{H}^{+}} \to \mathrm{W}^{+}\mathrm{A}$ process in the $\mathrm{A} \to \mu^{+}\mu^{-}$ decay channel. |
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Compact Muon Solenoid LHC, CERN |
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