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| CMS-PAS-SUS-20-003 | ||
| Search for chargino-neutralino production in final states with a Higgs boson and a W boson | ||
| CMS Collaboration | ||
| March 2021 | ||
| Abstract: A search is presented for electroweak production of supersymmetric particles in final states with one lepton, a Higgs boson decaying to a pair of bottom quarks, and large missing transverse momentum. The search uses data from proton-proton collisions at a center-of-mass energy of 13 TeV collected with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 137 fb$^{-1}$. The observed data yields are consistent with the estimated standard model backgrounds. Exclusions are set in the context of a simplified supersymmetric model of chargino-neutralino production, with the chargino decaying to a W boson and the lightest supersymmetric particle (LSP) and the neutralino decaying to a Higgs boson plus an LSP. Charginos and neutralinos with masses up to 820 GeV are excluded at 95% confidence level when the LSP mass is small, and LSPs with mass up to 350 GeV are excluded when the mass of the chargino and neutralino is about 700 GeV. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, Submitted to JHEP. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Diagram for a simplified SUSY model with electroweak production of the lightest chargino $\tilde{\chi}^{\pm}_1$ and next-to-lightest neutralino $\tilde{\chi}^0_2$. The $\tilde{\chi}^{\pm}_1$ decays to a W boson and the lightest neutralino $\tilde{\chi}^0_1$. The $\tilde{\chi}^0_2$ decays to a H boson and a $\tilde{\chi}^0_1$. |
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Figure 2:
Distributions of ${{p_{\mathrm {T}}} ^{\mathrm {miss}}}$, ${m_{\mathrm {CT}}}$, ${m_{\mathrm {b}\bar{\mathrm {b}}}}$, ${m_{\mathrm {T}}}$, ${N_{\mathrm {jets}}}$, and the $\mathrm{H} \to \mathrm{b} \mathrm{\bar{b}} $ large-R jet discriminator in simulated background and signal samples, illustrating the discrimination power of each variable. Three benchmark signal points corresponding to masses in GeV ($m_{ \tilde{\chi}^0_2 /\tilde{\chi}^{\pm}_1}$, $m_{\tilde{\chi}^0_1}$) of (800, 100), (425, 150) and (225, 75) are shown as solid, dashed and short dashed lines, respectively. Events are taken from the 2-jet signal regions with $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 125 GeV, with all the requirements specified in Table 3 except for the plotted variable. The gray bands correspond to the statistical uncertainty of the simulated backgrounds. The dashed vertical lines indicate the thresholds used to define the signal regions. These indicators are not shown on the Higgs tag discriminator score distribution because the required values vary between 0.83 and 0.9 from year to year. |
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Figure 2-a:
Distributions of ${{p_{\mathrm {T}}} ^{\mathrm {miss}}}$, ${m_{\mathrm {CT}}}$, ${m_{\mathrm {b}\bar{\mathrm {b}}}}$, ${m_{\mathrm {T}}}$, ${N_{\mathrm {jets}}}$, and the $\mathrm{H} \to \mathrm{b} \mathrm{\bar{b}} $ large-R jet discriminator in simulated background and signal samples, illustrating the discrimination power of each variable. Three benchmark signal points corresponding to masses in GeV ($m_{ \tilde{\chi}^0_2 /\tilde{\chi}^{\pm}_1}$, $m_{\tilde{\chi}^0_1}$) of (800, 100), (425, 150) and (225, 75) are shown as solid, dashed and short dashed lines, respectively. Events are taken from the 2-jet signal regions with $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 125 GeV, with all the requirements specified in Table 3 except for the plotted variable. The gray bands correspond to the statistical uncertainty of the simulated backgrounds. The dashed vertical lines indicate the thresholds used to define the signal regions. These indicators are not shown on the Higgs tag discriminator score distribution because the required values vary between 0.83 and 0.9 from year to year. |
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Figure 2-b:
Distributions of ${{p_{\mathrm {T}}} ^{\mathrm {miss}}}$, ${m_{\mathrm {CT}}}$, ${m_{\mathrm {b}\bar{\mathrm {b}}}}$, ${m_{\mathrm {T}}}$, ${N_{\mathrm {jets}}}$, and the $\mathrm{H} \to \mathrm{b} \mathrm{\bar{b}} $ large-R jet discriminator in simulated background and signal samples, illustrating the discrimination power of each variable. Three benchmark signal points corresponding to masses in GeV ($m_{ \tilde{\chi}^0_2 /\tilde{\chi}^{\pm}_1}$, $m_{\tilde{\chi}^0_1}$) of (800, 100), (425, 150) and (225, 75) are shown as solid, dashed and short dashed lines, respectively. Events are taken from the 2-jet signal regions with $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 125 GeV, with all the requirements specified in Table 3 except for the plotted variable. The gray bands correspond to the statistical uncertainty of the simulated backgrounds. The dashed vertical lines indicate the thresholds used to define the signal regions. These indicators are not shown on the Higgs tag discriminator score distribution because the required values vary between 0.83 and 0.9 from year to year. |
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Figure 2-c:
Distributions of ${{p_{\mathrm {T}}} ^{\mathrm {miss}}}$, ${m_{\mathrm {CT}}}$, ${m_{\mathrm {b}\bar{\mathrm {b}}}}$, ${m_{\mathrm {T}}}$, ${N_{\mathrm {jets}}}$, and the $\mathrm{H} \to \mathrm{b} \mathrm{\bar{b}} $ large-R jet discriminator in simulated background and signal samples, illustrating the discrimination power of each variable. Three benchmark signal points corresponding to masses in GeV ($m_{ \tilde{\chi}^0_2 /\tilde{\chi}^{\pm}_1}$, $m_{\tilde{\chi}^0_1}$) of (800, 100), (425, 150) and (225, 75) are shown as solid, dashed and short dashed lines, respectively. Events are taken from the 2-jet signal regions with $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 125 GeV, with all the requirements specified in Table 3 except for the plotted variable. The gray bands correspond to the statistical uncertainty of the simulated backgrounds. The dashed vertical lines indicate the thresholds used to define the signal regions. These indicators are not shown on the Higgs tag discriminator score distribution because the required values vary between 0.83 and 0.9 from year to year. |
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Figure 2-d:
Distributions of ${{p_{\mathrm {T}}} ^{\mathrm {miss}}}$, ${m_{\mathrm {CT}}}$, ${m_{\mathrm {b}\bar{\mathrm {b}}}}$, ${m_{\mathrm {T}}}$, ${N_{\mathrm {jets}}}$, and the $\mathrm{H} \to \mathrm{b} \mathrm{\bar{b}} $ large-R jet discriminator in simulated background and signal samples, illustrating the discrimination power of each variable. Three benchmark signal points corresponding to masses in GeV ($m_{ \tilde{\chi}^0_2 /\tilde{\chi}^{\pm}_1}$, $m_{\tilde{\chi}^0_1}$) of (800, 100), (425, 150) and (225, 75) are shown as solid, dashed and short dashed lines, respectively. Events are taken from the 2-jet signal regions with $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 125 GeV, with all the requirements specified in Table 3 except for the plotted variable. The gray bands correspond to the statistical uncertainty of the simulated backgrounds. The dashed vertical lines indicate the thresholds used to define the signal regions. These indicators are not shown on the Higgs tag discriminator score distribution because the required values vary between 0.83 and 0.9 from year to year. |
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Figure 2-e:
Distributions of ${{p_{\mathrm {T}}} ^{\mathrm {miss}}}$, ${m_{\mathrm {CT}}}$, ${m_{\mathrm {b}\bar{\mathrm {b}}}}$, ${m_{\mathrm {T}}}$, ${N_{\mathrm {jets}}}$, and the $\mathrm{H} \to \mathrm{b} \mathrm{\bar{b}} $ large-R jet discriminator in simulated background and signal samples, illustrating the discrimination power of each variable. Three benchmark signal points corresponding to masses in GeV ($m_{ \tilde{\chi}^0_2 /\tilde{\chi}^{\pm}_1}$, $m_{\tilde{\chi}^0_1}$) of (800, 100), (425, 150) and (225, 75) are shown as solid, dashed and short dashed lines, respectively. Events are taken from the 2-jet signal regions with $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 125 GeV, with all the requirements specified in Table 3 except for the plotted variable. The gray bands correspond to the statistical uncertainty of the simulated backgrounds. The dashed vertical lines indicate the thresholds used to define the signal regions. These indicators are not shown on the Higgs tag discriminator score distribution because the required values vary between 0.83 and 0.9 from year to year. |
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Figure 2-f:
Distributions of ${{p_{\mathrm {T}}} ^{\mathrm {miss}}}$, ${m_{\mathrm {CT}}}$, ${m_{\mathrm {b}\bar{\mathrm {b}}}}$, ${m_{\mathrm {T}}}$, ${N_{\mathrm {jets}}}$, and the $\mathrm{H} \to \mathrm{b} \mathrm{\bar{b}} $ large-R jet discriminator in simulated background and signal samples, illustrating the discrimination power of each variable. Three benchmark signal points corresponding to masses in GeV ($m_{ \tilde{\chi}^0_2 /\tilde{\chi}^{\pm}_1}$, $m_{\tilde{\chi}^0_1}$) of (800, 100), (425, 150) and (225, 75) are shown as solid, dashed and short dashed lines, respectively. Events are taken from the 2-jet signal regions with $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 125 GeV, with all the requirements specified in Table 3 except for the plotted variable. The gray bands correspond to the statistical uncertainty of the simulated backgrounds. The dashed vertical lines indicate the thresholds used to define the signal regions. These indicators are not shown on the Higgs tag discriminator score distribution because the required values vary between 0.83 and 0.9 from year to year. |
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Figure 3:
Comparison of the observed and simulated ${R_{\mathrm {top}}}$ values in the $ {m_{\mathrm {b}\bar{\mathrm {b}}}} > $ 150 GeV validation regions. The pulls of the ${R_{\mathrm {top}}}$ values are shown (the difference of the observed and simulated values, divided by the total statistical uncertainty) as well as the statistical precision of the comparisons, which are assigned as a systematic uncertainty in ${R_{\mathrm {top}}}$ for the corresponding bins in the signal region. |
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Figure 4:
Distribution of ${N_{\mathrm{b}}}$ in the low ${m_{\mathrm {T}}}$ control sample. The ${\mathrm{t} {}\mathrm{\bar{t}}} $+jets contribution is suppressed by requiring $ {m_{\mathrm {CT}}} > $ 200 GeV. The shaded area reflects the statistical uncertainty in the simulation. |
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Figure 5:
Predictions of the SM background after performing the signal extraction fit (filled histograms) and observed yields in the signal regions. The lower panel provides the ratio between the observation and the predicted SM backgrounds. Three signal models with different values of $m_{ \tilde{\chi}^0_2 /\tilde{\chi}^{\pm}_1}$ and $m_{\tilde{\chi}^0_1}$ are shown as solid, short dashed, and long dashed lines. The shaded band reflects the post-fit systematic and statistical uncertainties in the background prediction. |
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Figure 6:
Distribution of ${m_{\mathrm {b}\bar{\mathrm {b}}}}$ in the 2 jet signal regions, requiring $ {{p_{\mathrm {T}}} ^\text {miss}} > $ 125 GeV, $ {m_{\mathrm {T}}} > $ 150 GeV, $ {m_{\mathrm {CT}}} > $ 200 GeV and two b-tagged jets. The shaded area reflects the statistical uncertainties in the simulated event yields. The Monte Carlo simulation in this distribution is not representative of the background estimate; instead, the simulation is normalized to the data. |
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Figure 7:
Expected limits calculated with the data-driven background estimates and all of the background systematic uncertainties described in Sections 5.1 and 5.2. The color on the $z$ axis represents the 95% CL upper limit on the cross section at each point in the $m_{\tilde{\chi}^0_1}$ - $m_{ \tilde{\chi}^0_2}$ plane. The area below the thick black curve represents the observed exclusion region at this CL. The thick dashed red line indicates the expected limit at this CL, while the region containing 68% of the distribution of limits expected under the background-only hypothesis is bounded by thin dashed red lines. The thin black lines show the effect of the theoretical uncertainties in the signal cross section. |
| Tables | |
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Table 1:
Summary of the physics objects used in this analysis. $ {{p_{\mathrm {T}}} ^{\text {sum}}} $ is the scalar sum of the ${p_{\mathrm {T}}}$ of all charged particle-flow (PF) candidates in a cone around the lepton (track), excluding the lepton (track) itself. |
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Table 2:
Summary of the triggers used to select the analysis data set. The magnitude of the negative vector sum of the ${p_{\mathrm {T}}}$ of all jets and leptons in the event is denoted by ${H_{\mathrm {T}}^{\text {miss}}}$. The symbols $ {p_{\mathrm {T}}} ^{\ell}$ and $\eta ^{\ell}$ correspond to the transverse momentum and pseudorapidity of the lepton. |
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Table 3:
Summary of the requirements common to all signal regions. The $ {N_{\mathrm{b}}} $ is the multiplicity of b-tagged jets and $ {p_{\mathrm {T}}} ^{\mathrm {non-\mathrm{b}}}$ is the ${p_{\mathrm {T}}}$ of non-b-tagged jets. |
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Table 4:
Definition of the 12 orthogonal signal regions categorized in ${N_{\mathrm {\mathrm{H}}}}$, ${N_{\mathrm {jets}}}$, and ${{p_{\mathrm {T}}} ^\text {miss}}$. The $ {N_{\mathrm {\mathrm{H}}}} $ is the number of large-R jets tagged as $\mathrm{H} \to \mathrm{b} \mathrm{\bar{b}} $. |
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Table 5:
Summary of the observed yields in the low ${m_{\mathrm {CT}}}$ CRs, the ${R_{\mathrm {top}}}$ transfer factors, and the resulting top quark background estimate. The uncertainty shown for ${R_{\mathrm {top}}}$ is entirely of statistical origin. The top quark prediction includes the statistical uncertainty followed by the systematic uncertainty. |
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Table 6:
Values of ${R_{\mathrm{W}}}$ for the extrapolation of the W boson background from the CR to the SR, together with the observed ($N_{{\mathrm {CR}}}^{\textrm {obs.}}$) and top quark background subtracted yield ($N_{{\mathrm {CR}}}^{\mathrm{W}}$) in the CR, and the final W boson prediction. The CRs are defined inclusively in ${N_{\mathrm {\mathrm{H}}}}$. The W boson predictions for $ {N_{\mathrm {\mathrm{H}}}} =$ 1 signal regions use the sum of the CR yields from the corresponding $ {N_{\mathrm {\mathrm{H}}}} = $ 0 rows. The uncertainties in ${R_{\mathrm{W}}}$ include the statistical uncertainty only. The W boson prediction includes the statistical uncertainty, followed by the systematic uncertainty. |
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Table 7:
Sources of systematic uncertainties and their typical impact on ${R_{\mathrm{W}}}$. |
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Table 8:
Summary of the predicted SM background and the observed yield in the signal regions, together with the expected yields for three signal benchmark models. The total prediction is the sum of the top quark and W boson predictions, $N_{\mathrm {SR}}^{\mathrm {top}}$ and $N_{\mathrm {SR}}^{\mathrm {\mathrm{W}}}$, as well as small contributions from standard model WH production. The uncertainties include the statistical and systematic components. For each benchmark model column, the ordered pairs indicate the masses (in GeV) of the $\tilde{\chi}^0_2 /\tilde{\chi}^{\pm}_1$ and the $\tilde{\chi}^0_1$, respectively. |
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Table 9:
Sources of systematic uncertainties and their typical impact on the expected signal yields. The ranges reported reflect the magnitudes of the median 68% of all impacts, considering all 12 signal regions and every signal mass pair used. When the lower bound is very close to 0, an upper bound is shown instead. |
| Summary |
| This note presents the results of a search for chargino-neutralino production in a final state with a W boson decaying to leptons, a H boson decaying to a bottom quark-antiquark pair, and missing transverse momentum. Expected yields from SM processes are estimated by extrapolating yields in data control regions using transfer factors obtained from simulation. The observed data agree with the expected background yields. The results are interpreted as an exclusion on chargino-neutralino production. Charginos with mass below 820 GeV are disfavored for a low mass LSP, and values of the LSP mass up to about 350 GeV are excluded for a chargino mass around 700 GeV. |
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