CMS-EXO-17-003

CMS-EXO-17-003 ; CERN-EP-2018-218
Search for pair production of second-generation leptoquarks at $\sqrt{s} =$ 13 TeV
CMS Collaboration
15 August 2018
Phys. Rev. D 99 (2019) 032014
Abstract: A search for pair production of second-generation leptoquarks is performed using proton-proton collision data collected at $\sqrt{s} =$ 13 TeV in 2016 with the CMS detector at the CERN LHC, corresponding to an integrated luminosity of 35.9 fb $^{-1}$ . Final states with two muons and two jets, or with one muon, two jets, and missing transverse momentum are considered. Second-generation scalar leptoquarks with masses less than 1530 (1285) GeV are excluded for $\beta =$ 1.0 (0.5), where $\beta$ is the branching fraction for the decay of a leptoquark to a charged lepton and a quark. The results of the search are also interpreted as limits on the pair production of long-lived top squarks in an $R$ -parity violating supersymmetry model that has a final state with two muons and two jets. These limits represent the most stringent limits to date on these models.
Links: e-print arXiv:1808.05082 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; CADI line (restricted) ;

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: Dominant leading-order Feynman diagrams for the pair production of LQs at the LHC.
png pdf	Figure 1-a: A leading-order Feynman diagram for the pair production of LQs at the LHC.
png pdf	Figure 1-b: A leading-order Feynman diagram for the pair production of LQs at the LHC.
png pdf	Figure 1-c: A leading-order Feynman diagram for the pair production of LQs at the LHC.
png pdf	Figure 1-d: A leading-order Feynman diagram for the pair production of LQs at the LHC.
png pdf	Figure 2: Comparison of data and background at the preselection level for the ${{{\mu} {\mu} \mathrm {jj}}}$ channel, for the variables used for final the selection optimization: ${{m_{{\mu} {\mu}}}}$ (upper), ${{m_{{\mu} \mathrm {j}}^{\mathrm {min}}}}$ (lower left), and ${{S_{\mathrm {T}}^{{\mu} {\mu} \mathrm {jj}}}}$ (lower right). `Other background' includes W+jets, single top quark, and diboson backgrounds. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate.
png pdf	Figure 2-a: Comparison of data and background for the ${{m_{{\mu} {\mu}}}}$ variable, at the preselection level for the ${{{\mu} {\mu} \mathrm {jj}}}$ channel. `Other background' includes W+jets, single top quark, and diboson backgrounds. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate.
png pdf	Figure 2-b: Comparison of data and background for the ${{m_{{\mu} \mathrm {j}}^{\mathrm {min}}}}$ variable, at the preselection level for the ${{{\mu} {\mu} \mathrm {jj}}}$ channel. `Other background' includes W+jets, single top quark, and diboson backgrounds. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate.
png pdf	Figure 2-c: Comparison of data and background for the ${{S_{\mathrm {T}}^{{\mu} {\mu} \mathrm {jj}}}}$ variable, at the preselection level for the ${{{\mu} {\mu} \mathrm {jj}}}$ channel. `Other background' includes W+jets, single top quark, and diboson backgrounds. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate.
png pdf	Figure 3: Comparison of data and background at the preselection level for the ${{{\mu} {\nu}\mathrm {jj}}}$ channel, for the variables used for final selection criteria optimization: ${{m_{\mathrm {T}}^{{\mu} {\nu}}}}$ (upper), ${{m_{{\mu} \mathrm {j}}}}$ (lower left), and ${{S_{\mathrm {T}}^{{\mu} {\nu}\mathrm {jj}}}}$ (lower right). `Other background' includes ${\mathrm {Z}}/\gamma ^*$ +jets, single top quark, and diboson backgrounds. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate.
png pdf	Figure 3-a: Comparison of data and background for the ${{m_{\mathrm {T}}^{{\mu} {\nu}}}}$ variable, at the preselection level for the ${{{\mu} {\nu}\mathrm {jj}}}$ channel. `Other background' includes ${\mathrm {Z}}/\gamma ^*$ +jets, single top quark, and diboson backgrounds. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate.
png pdf	Figure 3-b: Comparison of data and background for the ${{m_{{\mu} \mathrm {j}}}}$ variable, at the preselection level for the ${{{\mu} {\nu}\mathrm {jj}}}$ channel. `Other background' includes ${\mathrm {Z}}/\gamma ^*$ +jets, single top quark, and diboson backgrounds. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate.
png pdf	Figure 3-c: Comparison of data and background for the ${{S_{\mathrm {T}}^{{\mu} {\nu}\mathrm {jj}}}}$ variable, at the preselection level for the ${{{\mu} {\nu}\mathrm {jj}}}$ channel. `Other background' includes ${\mathrm {Z}}/\gamma ^*$ +jets, single top quark, and diboson backgrounds. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate.
png pdf	Figure 4: Lower bounds of the final selection criteria for the three variables for the ${{{\mu} {\mu} \mathrm {jj}}}$ (left) and ${{{\mu} {\nu}\mathrm {jj}}}$ (right) channels as a function of scalar ${{m_{\mathrm {LQ}}}}$ .
png pdf	Figure 4-a: Lower bounds of the final selection criteria for the three variables for the ${{{\mu} {\mu} \mathrm {jj}}}$ channel as a function of scalar ${{m_{\mathrm {LQ}}}}$ .
png pdf	Figure 4-b: Lower bounds of the final selection criteria for the three variables for the ${{{\mu} {\nu}\mathrm {jj}}}$ channel as a function of scalar ${{m_{\mathrm {LQ}}}}$ .
png pdf	Figure 5: Comparison of data and background distributions of ${{S_{\mathrm {T}}^{{\mu} {\mu} \mathrm {jj}}}}$ (left) and ${{m_{{\mu} \mathrm {j}}^{\mathrm {min}}}}$ (upper right) and ${{m_{{\mu} \mathrm {j}}}}$ (lower right), for the ${{{\mu} {\mu} \mathrm {jj}}}$ channel (upper plots) and the ${{{\mu} {\nu}\mathrm {jj}}}$ channel (lower plots). Events after final selections with ${m_{\mathrm {LQ}}} =$ 1400 GeV are shown in the upper plots, and with ${m_{\mathrm {LQ}}} =$ 1100 GeV in the lower plots. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate. `Other background' includes W+jets, single top quark, and diboson backgrounds in the ${{{\mu} {\mu} \mathrm {jj}}}$ channel, and ${\mathrm {Z}}/\gamma ^*$ +jets, single top quark, and diboson backgrounds in the ${{{\mu} {\nu}\mathrm {jj}}}$ channel.
png pdf	Figure 5-a: Comparison of data and background distribution of ${{S_{\mathrm {T}}^{{\mu} {\mu} \mathrm {jj}}}}$ . Events after final selections with ${m_{\mathrm {LQ}}} =$ 1400 GeV are shown. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate. `Other background' includes W+jets, single top quark, and diboson backgrounds in the ${{{\mu} {\mu} \mathrm {jj}}}$ channel, and ${\mathrm {Z}}/\gamma ^*$ +jets, single top quark, and diboson backgrounds in the ${{{\mu} {\nu}\mathrm {jj}}}$ channel.
png pdf	Figure 5-b: Comparison of data and background distribution of ${{m_{{\mu} \mathrm {j}}^{\mathrm {min}}}}$ for the ${{{\mu} {\mu} \mathrm {jj}}}$ channel. Events after final selections with ${m_{\mathrm {LQ}}} =$ 1400 GeV are shown. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate. `Other background' includes W+jets, single top quark, and diboson backgrounds in the ${{{\mu} {\mu} \mathrm {jj}}}$ channel, and ${\mathrm {Z}}/\gamma ^*$ +jets, single top quark, and diboson backgrounds in the ${{{\mu} {\nu}\mathrm {jj}}}$ channel.
png pdf	Figure 5-c: Comparison of data and background distribution of ${{S_{\mathrm {T}}^{{\nu} {\mu} \mathrm {jj}}}}$ . Events after final selections with ${m_{\mathrm {LQ}}} =$ 1100 GeV are shown. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate. `Other background' includes W+jets, single top quark, and diboson backgrounds in the ${{{\mu} {\mu} \mathrm {jj}}}$ channel, and ${\mathrm {Z}}/\gamma ^*$ +jets, single top quark, and diboson backgrounds in the ${{{\mu} {\nu}\mathrm {jj}}}$ channel.
png pdf	Figure 5-d: Comparison of data and background distribution of ${{m_{{\mu} \mathrm {j}}}}$ for the ${{{\mu} {\nu}\mathrm {jj}}}$ channel. Events after final selections with ${m_{\mathrm {LQ}}} =$ 1100 GeV are shown. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate. `Other background' includes W+jets, single top quark, and diboson backgrounds in the ${{{\mu} {\mu} \mathrm {jj}}}$ channel, and ${\mathrm {Z}}/\gamma ^*$ +jets, single top quark, and diboson backgrounds in the ${{{\mu} {\nu}\mathrm {jj}}}$ channel.
png pdf	Figure 6: Data and background event yields after final selections for the ${{{\mu} {\mu} \mathrm {jj}}}$ analysis, as a function of scalar ${m_{\mathrm {LQ}}}$ . `Other background' includes W+jets and single top quark. The selection criteria for each bin are detailed in Table 1. All the bins are correlated, as the events selected for each ${{m_{\mathrm {LQ}}}}$ are a strict subset of the events selected for the lower mass LQ. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate.
png pdf	Figure 7: Data and background event yields after final selections for the ${{{\mu} {\nu}\mathrm {jj}}}$ analysis, as a function of ${m_{\mathrm {LQ}}}$ . `Other background' includes ${\mathrm {Z}}/\gamma ^*$ +jets and single top quark. The selection criteria for each bin are detailed in Table 2. All the bins are correlated, as the events selected for each ${m_{\mathrm {LQ}}}$ are a strict subset of the events selected for the lower mass LQ. The hashed band represents the combined statistical and systematic uncertainty in the full background estimate.
png pdf	Figure 8: The expected and observed upper limits at 95% CL on the product of the scalar LQ pair production cross section and the branching fractions $\beta ^2$ or $2\beta (1-\beta)$ as a function of the second-generation ${m_{\mathrm {LQ}}}$ obtained with the ${{{\mu} {\mu} \mathrm {jj}}}$ (left) and ${{{\mu} {\nu}\mathrm {jj}}}$ (right) analysis. The solid lines represent the observed limits, the dashed lines represent the median expected limits, and the inner dark-green and outer light-yellow bands represent the 68% and 95% confidence intervals. The $\sigma _{\text {theory}}$ curves and their blue bands represent the theoretical scalar LQ pair production cross sections and the uncertainties on the cross sections due to the choice of PDF and renormalization and factorization scales, respectively.
png pdf	Figure 8-a: The expected and observed upper limits at 95% CL on the product of the scalar LQ pair production cross section and the branching fractions $\beta ^2$ or $2\beta (1-\beta)$ as a function of the second-generation ${m_{\mathrm {LQ}}}$ obtained with the ${{{\mu} {\mu} \mathrm {jj}}}$ analysis. The solid line represents the observed limit, the dashed line represent the median expected limit, and the inner dark-green and outer light-yellow bands represent the 68% and 95% confidence intervals. The $\sigma _{\text {theory}}$ curve and its blue bands represent the theoretical scalar LQ pair production cross sections and the uncertainties on the cross sections due to the choice of PDF and renormalization and factorization scales, respectively.
png pdf	Figure 8-b: The expected and observed upper limits at 95% CL on the product of the scalar LQ pair production cross section and the branching fractions $\beta ^2$ or $2\beta (1-\beta)$ as a function of the second-generation ${m_{\mathrm {LQ}}}$ obtained with the ${{{\mu} {\nu}\mathrm {jj}}}$ analysis. The solid line represents the observed limit, the dashed line represent the median expected limit, and the inner dark-green and outer light-yellow bands represent the 68% and 95% confidence intervals. The $\sigma _{\text {theory}}$ curve and its blue bands represent the theoretical scalar LQ pair production cross sections and the uncertainties on the cross sections due to the choice of PDF and renormalization and factorization scales, respectively.
png pdf	Figure 9: The expected and observed exclusion limits at 95% CL for second-generation ${m_{\mathrm {LQ}}}$ as a function of the branching fraction $\beta$ vs. ${m_{\mathrm {LQ}}}$ . The inner dark-green and outer light-yellow expected limit uncertainty bands represent the 68% and 95% confidence intervals on the combination. Limits for the individual ${{{\mu} {\mu} \mathrm {jj}}}$ and ${{{\mu} {\nu}\mathrm {jj}}}$ channels are also drawn. The solid lines represent the observed limits in each channel, and the dashed lines represent the expected limits.
png pdf	Figure 10: Expected and observed upper limits at 95% CL on the long-lived RPV SUSY $\tilde{\mathrm{t}}$ pair production cross section as a function of $\tilde{\mathrm{t}}$ mass ( $x$ axis) and lifetime ( $y$ axis). The dashed line and the inner dark-green and outer light-yellow uncertainty bands represent the median expected limits, and the 68% and 95% confidence intervals, respectively. Extrapolation has been performed to produce a limit plot extending down to the prompt kinematic range.
png pdf	Figure 11: The product of signal acceptance and efficiency for optimized final selections as a function of ${m_{\mathrm {LQ}}}$ in the ${{{\mu} {\mu} \mathrm {jj}}}$ (left) and ${{{\mu} {\nu}\mathrm {jj}}}$ (right) channels.
png pdf	Figure 11-a: The product of signal acceptance and efficiency for optimized final selections as a function of ${m_{\mathrm {LQ}}}$ in the ${{{\mu} {\mu} \mathrm {jj}}}$ channel.
png pdf	Figure 11-b: The product of signal acceptance and efficiency for optimized final selections as a function of ${m_{\mathrm {LQ}}}$ in the ${{{\mu} {\nu}\mathrm {jj}}}$ channel.

Tables
png pdf	Table 1: Range of systematic uncertainties in the signal acceptance and background yields for the ${{{\mu} {\mu} \mathrm {jj}}}$ analysis. The last two lines show the total systematic uncertainty and the total statistical uncertainty in the simulated samples, respectively.
png pdf	Table 2: Range of systematic uncertainties in the signal acceptance and background yields for the ${{{\mu} {\nu}\mathrm {jj}}}$ analysis. The last two lines show the total systematic uncertainty and the total statistical uncertainty in the simulated samples, respectively.
png pdf	Table 3: Event yields after final selections for the ${{{\mu} {\mu} \mathrm {jj}}}$ analysis. `Other bkg.' includes W+jets and single top quark. Uncertainties are statistical unless otherwise indicated.
png pdf	Table 4: Event yields after final selections for the ${{{\mu} {\nu}\mathrm {jj}}}$ analysis. `Other bkg.' includes ${\mathrm {Z}}/\gamma ^*$ +jets and single top quark. Uncertainties are statistical unless otherwise indicated.

Summary

A search has been presented for pair production of second-generation leptoquarks using proton-proton collision data collected at

$\sqrt{s} =$ 13 TeV in 2016 with the CMS detector at the LHC, corresponding to an integrated luminosity of 35.9 fb

$^{-1}$ . Limits are set at 95% confidence level on the product of the scalar leptoquark pair production cross section and

$\beta^2$ (

$2\beta(1-\beta)$ ) in the

$\mu\mu\mathrm{jj}$ (

$\mu\nu\mathrm{jj}$ ) channels, for the branching fraction

$\beta =$ 1.0 (0.5) as a function of the leptoquark mass

${m_{\mathrm{LQ}}}$ . Second-generation leptoquarks with masses less than 1530 (1285) GeV are excluded for

$\beta=$ 1.0 (0.5), an improvement of 370 (525) GeV compared to previously published results. Two-dimensional limits are set in the

$\beta$ -

${{m_{\mathrm{LQ}}}}$ plane. The results in the

$\mu\mu\mathrm{jj}$ search are interpreted in the context of an

$R$ -parity violating supersymmetry model with long-lived top squarks. These limits represent the most stringent limits to date on these models.

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