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| CMS-PAS-HIG-15-009 | ||
| Search for a light pseudo-scalar Higgs boson produced in association with bottom quarks in pp collisions at $ \sqrt{s} = $ 8 TeV | ||
| CMS Collaboration | ||
| October 2016 | ||
| Abstract: We report on the search for a light pseudo-scalar Higgs boson produced in association with a bottom quark and decaying into dimuons. The search makes use of 19.8 fb$^{-1}$ of proton-proton collisions at a center-of-mass energy of 8 TeV, collected by the CMS experiment at the LHC. No signal is observed in the search for a pseudo-scalar Higgs boson and upper limits on the cross section times branching fraction are set. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 11 (2017) 010. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
The transverse momentum of the leading (left) and the subleading (right) ${p_{\mathrm {T}}}$ muon. |
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Figure 1-a:
The transverse momentum of the leading ${p_{\mathrm {T}}}$ muon. |
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Figure 1-b:
The transverse momentum of the subleading ${p_{\mathrm {T}}}$ muon. |
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Figure 2:
Left: the transverse momentum of the leading ${p_{\mathrm {T}}}$ bottom-quark tagged jet. Right: the missing transverse energy (MET). |
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Figure 2-a:
The transverse momentum of the leading ${p_{\mathrm {T}}}$ bottom-quark tagged jet. |
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Figure 2-b:
The missing transverse energy (MET). |
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Figure 3:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb. Left: with the use of PF jets; right: with the use of JPT jets. |
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Figure 3-a:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb, with the use of PF jets. |
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Figure 3-b:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb, with the use of JPT jets. |
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Figure 4:
Cross-check with the $\rm e^{+}e^{-}$ final state. The dielectron mass spectrum with the expected background event yield and its uncertainty. |
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Figure 5:
Left: the dimuon mass with the post-fit background event yield and its uncertainty given by the fit and the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb. Right: the expected and observed upper limit at 95% CL on $\sigma (\mathrm {pp \rightarrow b\bar{b}A)} \times \mathcal {B} \mathrm {(A}\rightarrow \mu \mu )$ as a function of the dimuon mass. The circles show the limits obtained in the CMS analysis of the $\mathrm {A}\rightarrow \tau \tau $ final state [7] and recalculated into the limits for the $\mathrm {A}\rightarrow \mu \mu $ final state using Eq.(1). |
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Figure 5-a:
The dimuon mass with the post-fit background event yield and its uncertainty given by the fit and the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb. |
png pdf |
Figure 5-b:
The expected and observed upper limit at 95% CL on $\sigma (\mathrm {pp \rightarrow b\bar{b}A)} \times \mathcal {B} \mathrm {(A}\rightarrow \mu \mu )$ as a function of the dimuon mass. The circles show the limits obtained in the CMS analysis of the $\mathrm {A}\rightarrow \tau \tau $ final state [7] and recalculated into the limits for the $\mathrm {A}\rightarrow \mu \mu $ final state using Eq.(1). |
png pdf |
Figure 6:
The transverse momentum of the leading (left) and the subleading (right) ${p_{\mathrm {T}}}$ muon. |
png pdf |
Figure 6-a:
The transverse momentum of the leading ${p_{\mathrm {T}}}$ muon. |
png pdf |
Figure 6-b:
The transverse momentum of the subleading ${p_{\mathrm {T}}}$ muon. |
png pdf |
Figure 7:
Left: the transverse momentum of the leading ${p_{\mathrm {T}}}$ bottom-quark tagged jet. Right: the missing transverse energy (MET). |
png pdf |
Figure 7-a:
The transverse momentum of the leading ${p_{\mathrm {T}}}$ bottom-quark tagged jet. |
png pdf |
Figure 7-b:
The missing transverse energy (MET). |
png pdf |
Figure 8:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb. Left: with the use of PF jets; right: with the use of JPT jets. |
png pdf |
Figure 8-a:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb, with the use of PF jets. |
png pdf |
Figure 8-b:
The dimuon mass with the expected background event yield and its uncertainty and with the expected signal for $\rm m_{A}= $ 30 GeV assuming the signal cross section times branching fraction of 350 fb, with the use of JPT jets. |
png pdf |
Figure 9:
Cross-check with the $\rm e^{+}e^{-}$ final state. The dielectron mass spectrum with the expected background event yield and its uncertainty. |
png pdf |
Figure 10:
Left: the dimuon mass with the post-fit background event yield and its uncertainty given by the fit and the expected signal for $\rm m_{A}=30 GeV $ assuming the signal cross section times branching fraction of 350 fb. Right: the expected and observed upper limit at 95% CL on $\sigma (\mathrm {pp \rightarrow b\bar{b}A)} \times \mathcal {B} \mathrm {(A}\rightarrow \mu \mu )$ as a function of the dimuon mass. The circles show the limits obtained in the CMS analysis of the $\mathrm {A}\rightarrow \tau \tau $ final state [7] and recalculated into the limits for the $\mathrm {A}\rightarrow \mu \mu $ final state using formula $\frac {\mathcal {B}\mathrm {(A}\rightarrow \tau \tau )}{\mathcal {B}\mathrm {(A}\rightarrow \mu \mu )}= [ m_{\tau} / m_{\mu} ]^2 $. |
png pdf |
Figure 10-a:
The dimuon mass with the post-fit background event yield and its uncertainty given by the fit and the expected signal for $\rm m_{A}=30 GeV $ assuming the signal cross section times branching fraction of 350 fb. |
png pdf |
Figure 10-b:
The expected and observed upper limit at 95% CL on $\sigma (\mathrm {pp \rightarrow b\bar{b}A)} \times \mathcal {B} \mathrm {(A}\rightarrow \mu \mu )$ as a function of the dimuon mass. The circles show the limits obtained in the CMS analysis of the $\mathrm {A}\rightarrow \tau \tau $ final state [7] and recalculated into the limits for the $\mathrm {A}\rightarrow \mu \mu $ final state using formula $\frac {\mathcal {B}\mathrm {(A}\rightarrow \tau \tau )}{\mathcal {B}\mathrm {(A}\rightarrow \mu \mu )}= [ m_{\tau} / m_{\mu} ]^2 $. |
| Summary |
| A light pseudo-scalar Higgs boson produced in association with a pair of b-jets and decaying into two muons has been searched for in pp collisions at $ \sqrt{s} = $ 8 TeV with an integrated luminosity of 19.8 fb$^{-1}$. No signal has been observed in the dimuon mass region of 25-60 GeV. Upper limits on the cross section times branching fraction, $\sigma(\mathrm{pp \rightarrow b\bar{b}A)} \times \mathcal{B}\mathrm{(A}\rightarrow\mu\mu)$ obtained have been set. The limits evaluated from the direct search for the $\mathrm{A} \rightarrow \mu\mu$ decay in the associated $\rm b \bar{b} A$ production are comparable with the upper limits from the search for the $\mathrm{A}\rightarrow\tau\tau$ final state from the same production process. It demonstrates the importance of the $\mu\mu$ final state for the overal experimental sensitivity in searches for $\rm b \bar{b}A$ production. This complementarity of the two final states can become particularly important should future larger data sets start revealing evidence of potential new physics. |
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Compact Muon Solenoid LHC, CERN |
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