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| CMS-HIG-18-020 ; CERN-EP-2019-083 | ||
| Search for a light charged Higgs boson decaying to a W boson and a CP-odd Higgs boson in final states with $\mathrm{e}\mu\mu$ or $ \mu\mu\mu$ in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 18 May 2019 | ||
| Phys. Rev. Lett. 123 (2019) 131802 | ||
| Abstract: A search for a light charged Higgs boson ($\mathrm{H}^{+}$) decaying to a W boson and a CP-odd Higgs boson (A) in final states with $\mathrm{e}\mu\mu$ or $ \mu\mu\mu$ is performed using data from pp collisions at $\sqrt{s} = $ 13 TeV, recorded by the CMS detector at the LHC and corresponding 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 oppositely charged 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 fractions ${\mathcal{B}({\mathrm{H}^{+}\to\mathrm{W^{+}}\mathrm{A} })}=$ 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. These are the first limits on ${\mathcal{B}({\mathrm{t}\to\mathrm{b}\mathrm{H}^{+}})}$ in the decay mode of the $\mathrm{H}^{+}$ boson: ${\mathrm{H}^{+}\to\mathrm{W^{+}}\mathrm{A} }\to\mathrm{W^{+}}\mu^{+}\mu^{-}$. | ||
| Links: e-print arXiv:1905.07453 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
The Feynman diagram of signal processes ($\ell = {\mathrm {e}}$ or $ {{\mu}}$, $ {\mathrm {W}} {\mathrm {W}}\to \ell {\nu} {\mathrm {q}} {\overline {\mathrm {q}}}^{\prime}$). |
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Figure 2:
The $ {\mathit {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 $ {\mathit {m}_{{{\mu}} {{\mu}}}}$ at centers of the corresponding windows are written in the parentheses on the $x$ axis of the right figure. The expected signal distribution for $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}=$ 130 and $ {\mathit {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 $ {\mathit {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 $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}=$ 130 and $ {\mathit {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}$. |
png pdf |
Figure 2-b:
The event yields in each signal window in the $ {{\mathrm {e}} {{\mu}} {{\mu}}}$ and $ {{{\mu}} {{\mu}} {{\mu}}}$ final states. Values of $ {\mathit {m}_{{{\mu}} {{\mu}}}}$ at centers of the corresponding windows are written in the parentheses on the $x$ axis of the figure. The expected signal distribution for $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}=$ 130 and $ {\mathit {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}} ^{+}})}$ for the $ {\mathit {m}_{{\mathrm {A}}}}$ values defined in Table 1, with an assumption of $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}= {\mathit {m}_{{\mathrm {A}}}}+85 GeV $ (left) or $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}} = $ 160 GeV (right). 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. |
png pdf |
Figure 3-a:
Expected and observed upper limits at 95% CL on $ {\mathcal {B}({{\mathrm {t}}\to {\mathrm {b}} {\mathrm {H}} ^{+}})}$ for the $ {\mathit {m}_{{\mathrm {A}}}}$ values defined in Table 1, with an assumption of $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}= {\mathit {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. |
png pdf |
Figure 3-b:
Expected and observed upper limits at 95% CL on $ {\mathcal {B}({{\mathrm {t}}\to {\mathrm {b}} {\mathrm {H}} ^{+}})}$ for the $ {\mathit {m}_{{\mathrm {A}}}}$ values defined in Table 1, with an assumption of $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}} = $ 160 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. |
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Figure A1:
The fraction of signal events passing the final event selection in the $ {{\mathrm {e}} {{\mu}} {{\mu}}}$ (left) and $ {{{\mu}} {{\mu}} {{\mu}}}$ (right) final states. The fraction is relative to the yield before the decays of the two W bosons in the signal processes ($ {{\mathrm {t}\overline {\mathrm {t}}}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}} {\mathrm {W^+}} {\mathrm {W^-}} {{{\mu ^+}} {{\mu ^-}}} $), which include the branching fraction of each decay mode of the two W bosons ($\mathcal {B}$) and the acceptance (A) times efficiency ($\varepsilon $) of the event selection for the decay mode. All decay modes of the two W bosons are considered in the calculation except the cases where both of the bosons decay hadronically. |
png pdf |
Figure A1-a:
The fraction of signal events passing the final event selection in the $ {{\mathrm {e}} {{\mu}} {{\mu}}}$ final state. The fraction is relative to the yield before the decays of the two W bosons in the signal processes ($ {{\mathrm {t}\overline {\mathrm {t}}}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}} {\mathrm {W^+}} {\mathrm {W^-}} {{{\mu ^+}} {{\mu ^-}}} $), which include the branching fraction of each decay mode of the two W bosons ($\mathcal {B}$) and the acceptance (A) times efficiency ($\varepsilon $) of the event selection for the decay mode. All decay modes of the two W bosons are considered in the calculation except the cases where both of the bosons decay hadronically. |
png pdf |
Figure A1-b:
The fraction of signal events passing the final event selection in the $ {{{\mu}} {{\mu}} {{\mu}}}$ final state. The fraction is relative to the yield before the decays of the two W bosons in the signal processes ($ {{\mathrm {t}\overline {\mathrm {t}}}} \to {{\mathrm {b}} {\overline {\mathrm {b}}}} {\mathrm {W^+}} {\mathrm {W^-}} {{{\mu ^+}} {{\mu ^-}}} $), which include the branching fraction of each decay mode of the two W bosons ($\mathcal {B}$) and the acceptance (A) times efficiency ($\varepsilon $) of the event selection for the decay mode. All decay modes of the two W bosons are considered in the calculation except the cases where both of the bosons decay hadronically. |
png pdf |
Figure A2:
The $ {\mathit {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}}}$ (upper) and $ {{{\mu}} {{\mu}} {{\mu}}}$ (lower) final states. A constant bin size (1 GeV) is used in the left figures except the last bin of $[80,\,81.2]$ (GeV). Values of $ {\mathit {m}_{{{\mu}} {{\mu}}}}$ at centers of the corresponding windows are written in the parentheses on the $x$ axis of the right figures. The expected signal distribution for $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}=$ 130 and $ {\mathit {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}$. |
png pdf |
Figure A2-a:
The $ {\mathit {m}_{{{\mu}} {{\mu}}}}$ distribution of candidate muon pairs from A bosons in the $ {{\mathrm {e}} {{\mu}} {{\mu}}}$ final state. A constant bin size (1 GeV) is used except the last bin of $[80,\,81.2]$ (GeV). The expected signal distribution for $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}=$ 130 and $ {\mathit {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}$. |
png pdf |
Figure A2-b:
The $ {\mathit {m}_{{{\mu}} {{\mu}}}}$ distribution of candidate muon pairs from A bosons in the $ {{{\mu}} {{\mu}} {{\mu}}}$ final state. A constant bin size (1 GeV) is used except the last bin of $[80,\,81.2]$ (GeV). The expected signal distribution for $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}=$ 130 and $ {\mathit {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}$. |
png pdf |
Figure A2-c:
The event yields in each signal window in the $ {{\mathrm {e}} {{\mu}} {{\mu}}}$ final state. Values of $ {\mathit {m}_{{{\mu}} {{\mu}}}}$ at centers of the corresponding windows are written in the parentheses on the $x$ axis of the figures. The expected signal distribution for $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}=$ 130 and $ {\mathit {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}$. |
png pdf |
Figure A2-d:
The event yields in each signal window in the $ {{{\mu}} {{\mu}} {{\mu}}}$ final state. Values of $ {\mathit {m}_{{{\mu}} {{\mu}}}}$ at centers of the corresponding windows are written in the parentheses on the $x$ axis of the figures. The expected signal distribution for $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}=$ 130 and $ {\mathit {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}$. |
png pdf |
Figure A3:
Upper limits at 95% CL on $ {\mathcal {B}({{\mathrm {t}}\to {\mathrm {b}} {\mathrm {H}} ^{+}})}$ for the 95 $ {\mathit {m}_{{\mathrm {A}}}}$ values, with an assumption of $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}= {\mathit {m}_{{\mathrm {A}}}}$+85 GeV (left) or $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}} = $ 160 GeV (right), for individual final states (upper: $ {{\mathrm {e}} {{\mu}} {{\mu}}}$ and lower: $ {{{\mu}} {{\mu}} {{\mu}}}$ final states). In the calculation, 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. A2 are assumed. |
png pdf |
Figure A3-a:
Upper limits at 95% CL on $ {\mathcal {B}({{\mathrm {t}}\to {\mathrm {b}} {\mathrm {H}} ^{+}})}$ for the 95 $ {\mathit {m}_{{\mathrm {A}}}}$ values, with an assumption of $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}= {\mathit {m}_{{\mathrm {A}}}}$+85 GeV, for the $ {{\mathrm {e}} {{\mu}} {{\mu}}}$ final state. In the calculation, 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. A2 are assumed. |
png pdf |
Figure A3-b:
Upper limits at 95% CL on $ {\mathcal {B}({{\mathrm {t}}\to {\mathrm {b}} {\mathrm {H}} ^{+}})}$ for the 95 $ {\mathit {m}_{{\mathrm {A}}}}$ values, with an assumption of $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}} = $ 160 GeV, for the $ {{\mathrm {e}} {{\mu}} {{\mu}}}$ final state. In the calculation, 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. A2 are assumed. |
png pdf |
Figure A3-c:
Upper limits at 95% CL on $ {\mathcal {B}({{\mathrm {t}}\to {\mathrm {b}} {\mathrm {H}} ^{+}})}$ for the 95 $ {\mathit {m}_{{\mathrm {A}}}}$ values, with an assumption of $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}}= {\mathit {m}_{{\mathrm {A}}}}$+85 GeV, for the $ {{{\mu}} {{\mu}} {{\mu}}}$ final state. In the calculation, 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. A2 are assumed. |
png pdf |
Figure A3-d:
Upper limits at 95% CL on $ {\mathcal {B}({{\mathrm {t}}\to {\mathrm {b}} {\mathrm {H}} ^{+}})}$ for the 95 $ {\mathit {m}_{{\mathrm {A}}}}$ values, with an assumption of $ {\mathit {m}_{{{\mathrm {H}} ^{+}}}} = $ 160 GeV, for the $ {{{\mu}} {{\mu}} {{\mu}}}$ final state. In the calculation, 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. A2 are assumed. |
| Tables | |
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Table 1:
Summary of mass windows ($ {| {\mathit {m}_{{{\mu}} {{\mu}}}}- {\mathit {m}_{{\mathrm {A}}}} |} < w$) for each $ {\mathit {m}_{{\mathrm {A}}}}$ hypothesis. |
| Summary |
| In summary, a search is performed for a charged Higgs boson $\mathrm{H}^{+}$, produced in the decay of a top quark, and decaying further into a W boson and a CP-odd 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 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. Assuming branching fractions ${\mathcal{B}({\mathrm{H}^{+}\to\mathrm{W^{+}}\mathrm{A} })}=$ 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 of the $\mathrm{H}^{+}$ and A bosons. 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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