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| CMS-PAS-EXO-16-055 | ||
| Search for dark matter produced in association with a Higgs boson decaying to $\gamma\gamma$ or $\tau^+\tau^-$ at $\sqrt{s}= $ 13 TeV with the CMS detector | ||
| CMS Collaboration | ||
| March 2018 | ||
| Abstract: A search for dark matter is performed by looking for events in pp collisions with large missing transverse momentum and a recoiling Higgs boson that decays to either a pair of photons or a pair of tau leptons. The data correspond to an integrated luminosity of 35.9 fb$^{-1}$ collected in 2016 by the CMS experiment at the CERN LHC at a center-of-mass energy of 13 TeV. No significant excess over the expected standard model background is observed. Results are interpreted in the context of two benchmark simplified models. Upper limits with 95% confidence level are presented for the signal production cross section times branching fraction. Results are also interpreted in terms of 90% confidence level limits on the spin-independent dark matter-nucleon cross section as a function of dark matter mass. This is the first search for dark matter produced in association with a Higgs boson decaying to two tau leptons. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 09 (2018) 046. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Leading order Feynman diagrams for DM ($\chi $) associated production with a Higgs boson ($h$) for the two theoretical models considered in this analysis: $Z'$-2HDM (left) and baryonic $Z'$ (right). |
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Figure 1-a:
Leading order Feynman diagram for DM ($\chi $) associated production with a Higgs boson ($h$) for the two theoretical models considered in this analysis: $Z'$-2HDM. |
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Figure 1-b:
Leading order Feynman diagram for DM ($\chi $) associated production with a Higgs boson ($h$) for the two theoretical models considered in this analysis: baryonic $Z'$. |
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Figure 2:
Distribution of the $ {{p_{\mathrm {T}}} ^\text {miss}} $ for events passing all other selection criteria. The cross sections of the signals are set to 1 pb. The total MC background is normalized to the integral of the data. Only the MC statistical uncertainties on the total background are shown in the hatched bands. The data-to-simulation ratio is shown in the lower panel. |
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Figure 3:
The background-only fit to data is performed, for low-$ {{p_{\mathrm {T}}} ^\text {miss}} $ (left) and high-$ {{p_{\mathrm {T}}} ^\text {miss}} $ (right) categories, with the sum of a power law (dashed black) fit function to describe the nonresonant contribution and a resonant shape, taken from simulation, to take into account the SM ${h \rightarrow \gamma \gamma}$ contribution (solid red). The SM Higgs contribution is fixed to the theory prediction in the statistical analysis. The sum of the nonresonant and resonant shapes (solid blue) is used to estimate the total background in this analysis. |
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Figure 3-a:
The background-only fit to data is performed, for the low-$ {{p_{\mathrm {T}}} ^\text {miss}} $ category, with the sum of a power law (dashed black) fit function to describe the nonresonant contribution and a resonant shape, taken from simulation, to take into account the SM ${h \rightarrow \gamma \gamma}$ contribution (solid red). The SM Higgs contribution is fixed to the theory prediction in the statistical analysis. The sum of the nonresonant and resonant shapes (solid blue) is used to estimate the total background in this analysis. |
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Figure 3-b:
The background-only fit to data is performed, for the high-$ {{p_{\mathrm {T}}} ^\text {miss}} $ category, with the sum of a power law (dashed black) fit function to describe the nonresonant contribution and a resonant shape, taken from simulation, to take into account the SM ${h \rightarrow \gamma \gamma}$ contribution (solid red). The SM Higgs contribution is fixed to the theory prediction in the statistical analysis. The sum of the nonresonant and resonant shapes (solid blue) is used to estimate the total background in this analysis. |
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Figure 4:
Distributions of the total transverse mass in the signal region for the $ {{\mu}} {{\tau}_{\rm h}} $ (top left), $ {\mathrm {e}} {{\tau}_{\rm h}} $ (top right), and $ {{\tau}_{\rm h}} {{\tau}_{\rm h}} $ (bottom) final states. The overflow of the distribution is included in the final 400-500 GeV bin. |
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Figure 4-a:
Distribution of the total transverse mass in the signal region for the $ {{\mu}} {{\tau}_{\rm h}} $ final state. The overflow of the distribution is included in the final 400-500 GeV bin. |
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Figure 4-b:
Distribution of the total transverse mass in the signal region for the $ {\mathrm {e}} {{\tau}_{\rm h}} $ final state. The overflow of the distribution is included in the final 400-500 GeV bin. |
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Figure 4-c:
Distribution of the total transverse mass in the signal region for the $ {{\tau}_{\rm h}} {{\tau}_{\rm h}} $ final state. The overflow of the distribution is included in the final 400-500 GeV bin. |
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Figure 5:
Expected and observed 95% CL upper limits on $Z'$-2HDM dark matter production cross section for the $ {h \rightarrow \gamma \gamma} $ channel, $ {h \rightarrow \tau ^+\tau ^-} $ channel, and their combined exclusion. |
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Figure 6:
Observed 95% CL upper limits on $Z'$-2HDM signal strength for the $ {h \rightarrow \gamma \gamma} $ (left), $ {h \rightarrow \tau ^+\tau ^-} $ (right), and combination of the two channels (lower center). The observed (expected) two-dimensional exclusion curves are shown with thick red (dashed black) lines. The plus and minus one standard deviation expected exclusion curves are also shown as thin black lines. The region below the lines is excluded. |
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Figure 6-a:
Observed 95% CL upper limits on $Z'$-2HDM signal strength for the $ {h \rightarrow \gamma \gamma} $. The observed (expected) two-dimensional exclusion curves are shown with thick red (dashed black) lines. The plus and minus one standard deviation expected exclusion curves are also shown as thin black lines. The region below the lines is excluded. |
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Figure 6-b:
Observed 95% CL upper limits on $Z'$-2HDM signal strength for the $ {h \rightarrow \tau ^+\tau ^-} $. The observed (expected) two-dimensional exclusion curves are shown with thick red (dashed black) lines. The plus and minus one standard deviation expected exclusion curves are also shown as thin black lines. The region below the lines is excluded. |
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Figure 6-c:
Observed 95% CL upper limits on $Z'$-2HDM signal strength for the combination of the $ {h \rightarrow \gamma \gamma} $ and $ {h \rightarrow \tau ^+\tau ^-} $ channels. The observed (expected) two-dimensional exclusion curves are shown with thick red (dashed black) lines. The plus and minus one standard deviation expected exclusion curves are also shown as thin black lines. The region below the lines is excluded. |
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Figure 7:
Expected and observed 95% CL upper limits on baryonic $Z'$ dark matter production cross section for the $ {h \rightarrow \gamma \gamma} $ channel, $ {h \rightarrow \tau ^+\tau ^-} $ channel, and their combined exclusion. |
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Figure 8:
Observed 95% CL upper limits on $Z'$ signal strength for the $ {h \rightarrow \gamma \gamma} $ (left), $ {h \rightarrow \tau ^+\tau ^-} $ (right), and combination of the two channels (lower center). The observed (expected) two-dimensional exclusion curves are shown with thick red (dashed black) lines. The plus and minus one standard deviation expected exclusion curves are also shown as thin black lines. The region below the lines is excluded. |
png pdf |
Figure 8-a:
Observed 95% CL upper limits on $Z'$ signal strength for the $ {h \rightarrow \gamma \gamma} $ channel. The observed (expected) two-dimensional exclusion curves are shown with thick red (dashed black) lines. The plus and minus one standard deviation expected exclusion curves are also shown as thin black lines. The region below the lines is excluded. |
png pdf |
Figure 8-b:
Observed 95% CL upper limits on $Z'$ signal strength for the $ {h \rightarrow \tau ^+\tau ^-} $ channel. The observed (expected) two-dimensional exclusion curves are shown with thick red (dashed black) lines. The plus and minus one standard deviation expected exclusion curves are also shown as thin black lines. The region below the lines is excluded. |
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Figure 8-c:
Observed 95% CL upper limits on $Z'$ signal strength for the combination of the two channels $ {h \rightarrow \gamma \gamma} $ $ {h \rightarrow \tau ^+\tau ^-} $ channels. The observed (expected) two-dimensional exclusion curves are shown with thick red (dashed black) lines. The plus and minus one standard deviation expected exclusion curves are also shown as thin black lines. The region below the lines is excluded. |
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Figure 9:
The 90% CL exclusion limits on the DM-nucleon SI scattering cross section as a function of $m_{\rm {DM}}$. Results obtained in this analysis are compared with those from direct detection experiments. The latter exclude the regions above the curves. Limits from CDMSLite [62], LUX [63], XENON-1T [64], PandaX-II [65], and CRESST-II [66] are shown. |
| Tables | |
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Table 1:
Optimized kinematic requirements for the low- and high-$ {{p_{\mathrm {T}}} ^\text {miss}} $ categories. |
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Table 2:
Kinematic selection requirements for the three $ {\tau} {\tau}$ decay channels. The online threshold requirement for the trigger is given in the first column by the number inside the parentheses. |
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Table 3:
Systematic uncertainties affecting the various samples in the ${h \rightarrow \gamma \gamma}$ channel. |
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Table 4:
Systematic uncertainties affecting the various samples in the ${h \rightarrow \tau ^+\tau ^-}$ channel. |
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Table 5:
Expected background yields and observed number of events in the ${m_{\gamma \gamma}}$ range of 122 to 128 GeV for low- and high-$ {{p_{\mathrm {T}}} ^\text {miss}} $ categories. The nonresonant background includes QCD, $\gamma \gamma $, ${\gamma + \text {jet}}$, and electroweak backgrounds and is estimated from the analytic function fit to the data. The irreducible background from the SM Higgs boson associated production is presented separated from the other SM $h$ production modes. For the resonant background contributions both the statistical and the systematic uncertainties are listed. The systematic uncertainty associated to the nonresonant background is not included. |
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Table 6:
Estimated background yields for $M_{T,tot} > $ 260 GeV in the signal region for 35.9 fb$^{-1}$ of 2016 data. The total expected yields include the statistical and systematic uncertainties. |
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Table 7:
The expected signal yields and A$\times \epsilon $ for the two benchmark models. |
| Summary |
|
A search for dark matter produced in association with a Higgs boson has been performed. The study presented examines the case where the Higgs boson decays to either two photons or two tau leptons. This analysis is based on 35.9 fb$^{-1}$ of pp collision data collected with the CMS detector during 2016 at $\sqrt{s} = $ 13 TeV. The results of the search are interpreted in terms of $Z'$-2HDM and baryonic $Z'$ simplified models of dark matter production. In the ${h \rightarrow \gamma\gamma} $ channel, a slight excess is observed at low-$ {p_{\mathrm{T}}}^{\text{miss}} $. However, the results are driven by the high-$ {p_{\mathrm{T}}}^{\text{miss}} $ region where no excess is observed. No significant deviation from the standard model background is observed in the ${h \rightarrow \tau^+\tau^-} $ channel. A statistical combination of the two channels was performed and these results were used to produce upper limits on DM production. Limits on the signal production cross section are calculated for both simplified models. For the $Z'$-2HDM signal, with $m_A = $ 300 GeV and $m_{DM} = $ 100 GeV, $Z'$ masses up to 1265 GeV are excluded at 95% CL. For the baryonic $Z'$ model, with $m_{DM} = $ 1 GeV, $Z'$ masses up to 815 GeV are excluded. This is the first search for dark matter produced in association with a Higgs boson decaying to two tau leptons. |
| References | ||||
| 1 | G. Bertone, D. Hooper, and J. Silk | Particle dark matter: evidence, candidates and constraints | PR 405 (2005) 279 | hep-ph/0404175 |
| 2 | ATLAS Collaboration | Observation of a new particle in the search for the Standard Model Higgs boson with the ATLAS detector at the LHC | PLB 716 (2012) 1 | 1207.7214 |
| 3 | CMS Collaboration | Observation of a new boson at a mass of 125 GeV with the CMS experiment at the LHC | PLB 716 (2012) 30 | CMS-HIG-12-028 1207.7235 |
| 4 | CMS Collaboration | Observation of a new boson with mass near 125 GeV in pp collisions at $ \sqrt{s} = $ 7 and 8 TeV | JHEP 06 (2013) 081 | CMS-HIG-12-036 1303.4571 |
| 5 | A. A. Petrov and W. Shepherd | Searching for dark matter at LHC with mono-Higgs production | PLB 730 (2014) 178 | 1311.1511 |
| 6 | A. Berlin, T. Lin, and L. Wang | Mono-Higgs detection of dark matter at the LHC | JHEP 78 (2014) 1 | |
| 7 | L. Carpenter et al. | Mono-Higgs-boson: A new collider probe of dark matter | PRD 89 (2014) 24 | |
| 8 | ATLAS Collaboration | Search for dark matter produced in association with a Higgs boson decaying to two bottom quarks in $ \rm{pp} $ collisions at $ \sqrt{s} = $ 8 TeV with the ATLAS detector | PRD 93 (2016) 47 | 1510.06218 |
| 9 | ATLAS Collaboration | Search for dark matter in events with missing transverse momentum and a Higgs boson decaying to two photons in $ \rm{pp} $ collisions at $ \sqrt{s} = $ 8 TeV with the ATLAS detector | PRL 115 (2015) 131801 | 1506.01081 |
| 10 | ATLAS Collaboration | Search for dark matter in association with a Higgs boson decaying to $ b $-quarks in $ pp $ collisions at $ \sqrt{s} = $ 13 TeV with the ATLAS detector | PLB765 (2017) 11--31 | 1609.04572 |
| 11 | CMS Collaboration | Search for associated production of dark matter with a Higgs boson decaying to $ b\overline{b} $ or $ \gamma\gamma $ at $ \sqrt{s}= $ 13 TeV | JHEP 2017 (2017), no. 10, 180 | |
| 12 | ATLAS Collaboration | Search for dark matter in association with a Higgs boson decaying to two photons at $ \sqrt{s} = $ 13 TeV with the ATLAS detector | PRD 96 (2017) 112004 | |
| 13 | D. Abercrombie | Dark matter benchmark models for early LHC Run-2 searches: Report of the ATLAS/CMS dark matter forum | hep-ex/1507.00966 | |
| 14 | N. Craig, J. Galloway, and S. Thomas | Searching for signs of the second Higgs doublet | 1305.2424 | |
| 15 | G. C. Branco et al. | Theory and phenomenology of two-Higgs-doublet models | PR 516 (2012) 1 | 1106.0034 |
| 16 | A. Boveia et al. | Recommendations on presenting LHC searches for missing transverse energy signals using simplified $ s $-channel models of dark matter | 1603.04156 | |
| 17 | CMS Collaboration | The CMS experiment at the CERN LHC | JINST 3 (2008) S08004 | CMS-00-001 |
| 18 | CMS Collaboration | Particle-flow reconstruction and global event description with the CMS detector | JINST 12 (2017) P10003 | CMS-PRF-14-001 1706.04965 |
| 19 | CMS Collaboration | Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at $ \sqrt{s} = $ 8 TeV | JINST 10 (2015), no. 08, P08010 | CMS-EGM-14-001 1502.02702 |
| 20 | CMS Collaboration | Performance of CMS muon reconstruction in pp collision events at $ \sqrt{s} = $ 7 TeV | JINST 7 (2012) P10002 | CMS-MUO-10-004 1206.4071 |
| 21 | M. Cacciari, G. P. Salam, and G. Soyez | FastJet user manual | EPJC 72 (2012) 1896 | 1111.6097 |
| 22 | M. Cacciari, G. P. Salam, and G. Soyez | The anti-$ k_t $ jet clustering algorithm | JHEP 04 (2008) 063 | 0802.1189 |
| 23 | CMS Collaboration | Reconstruction and identification of $ \tau $ lepton decays to hadrons and $ \nu_{\tau} $ at CMS | JINST 11 (2016), no. 01, P01019 | |
| 24 | CMS Collaboration | Identification of b-quark jets with the CMS experiment | JINST 8 (2013) P04013 | CMS-BTV-12-001 1211.4462 |
| 25 | CMS Collaboration | Identification of b quark jets at the CMS Experiment in the LHC Run 2 | CDS | |
| 26 | CMS Collaboration | Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV | Submitted to \it JINST | CMS-BTV-16-002 1712.07158 |
| 27 | CMS Collaboration | Performance of the CMS missing transverse momentum reconstruction in pp data at $ \sqrt{s} = $ 8 TeV | JINST 10 (2015), no. 02, P02006 | |
| 28 | CMS Collaboration | Performance of missing energy reconstruction in 13 TeV pp collision data using the CMS detector | CDS | |
| 29 | J. Alwall et al. | The automated computation of tree-level and next-to-leading order differential cross sections, and their matching to parton shower simulations | JHEP 07 (2014) 079 | 1405.0301 |
| 30 | Sjostrand, Torbjorn and Ask, Stefan and Christiansen, Jesper R. and Corke, Richard and Desai, Nishita and Ilten, Philip and Mrenna, Stephen and Prestel, Stefan and Rasmussen, Christine O. and Skands, Peter Z. | An Introduction to PYTHIA 8.2 | CPC 191 (2015) 159--177 | 1410.3012 |
| 31 | T. Gleisberg et al. | Event generation with SHERPA 1.1 | Journal of High Energy Physics 2009 (2009), no. 02, 007 | |
| 32 | J. Alwall et al. | MadGraph 5: going beyond | JHEP 06 (2011) 128 | 1106.0522 |
| 33 | J. Alwall et al. | Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions | EPJC53 (2008) 473--500 | 0706.2569 |
| 34 | S. Frixione, P. Nason, and C. Oleari | Matching NLO QCD computations with parton shower simulations: the POWHEG method | JHEP 11 (2007) 070 | 0709.2092 |
| 35 | S. Alioli, P. Nason, C. Oleari, and E. Re | A general framework for implementing NLO calculations in shower Monte Carlo programs: the POWHEG BOX | JHEP 06 (2010) 043 | 1002.2581 |
| 36 | S. Alioli et al. | Jet pair production in POWHEG | JHEP 04 (2011) 081 | 1012.3380 |
| 37 | S. Alioli, P. Nason, C. Oleari, and E. Re | NLO Higgs boson production via gluon fusion matched with shower in POWHEG | JHEP 04 (2009) 002 | 0812.0578 |
| 38 | R. Frederix and S. Frixione | Merging meets matching in mc@nlo | JHEP 2012 (2012), no. 12, 61 | |
| 39 | CMS Collaboration | Observation of the Higgs boson decay to a pair of $ \tau $ leptons with the CMS detector | PLB779 (2018) 283--316 | CMS-HIG-16-043 1708.00373 |
| 40 | NNPDF Collaboration | Parton distributions for the LHC Run II | JHEP 04 (2015) 040 | 1410.8849 |
| 41 | P. Skands, S. Carrazza, and J. Rojo | Tuning PYTHIA 8.1: the Monash 2013 tune | EPJC 74 (2014) 3024 | 1404.5630 |
| 42 | CMS Collaboration | Event generator tunes obtained from underlying event and multiparton scattering measurements | EPJC 76 (2016), no. 3, 155 | CMS-GEN-14-001 1512.00815 |
| 43 | GEANT4 Collaboration | GEANT4 --- a simulation toolkit | NIMA 506 (2003) 250 | |
| 44 | M. Cacciari and G. P. Salam | Pileup subtraction using jet areas | PLB 659 (2008) 119 | |
| 45 | CMS Collaboration | Measurements of properties of the Higgs boson in the diphoton decay channel with the full 2016 data set | CMS-PAS-HIG-16-040 | CMS-PAS-HIG-16-040 |
| 46 | CMS Collaboration | Search for new physics in events with a leptonically decaying Z boson and a large transverse momentum imbalance in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | CMS-EXO-16-052 1711.00431 |
|
| 47 | CMS Collaboration | Performance of tau-lepton reconstruction and identification in cms | physics.ins-det/1112.2577 | |
| 48 | CMS Collaboration | CMS Luminosity Measurements for the 2016 Data Taking Period | CMS-PAS-LUM-17-001 | CMS-PAS-LUM-17-001 |
| 49 | LHC Higgs Cross Section Working Group Collaboration | Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector | 1610.07922 | |
| 50 | J. Butterworth et al. | PDF4LHC recommendations for LHC Run II | JPG43 (2016) 023001 | 1510.03865 |
| 51 | CMS Collaboration Collaboration | Measurement of differential fiducial cross sections for Higgs boson production in the diphoton decay channel in pp collisions at $ \sqrt{s}= $ 13 TeV | CMS-PAS-HIG-17-015, CERN, Geneva | |
| 52 | CMS Collaboration | Measurements of inclusive W and Z cross sections in pp collisions at $ \sqrt{s} = $ 7 TeV | JHEP 01 (2011) 080 | CMS-EWK-10-002 1012.2466 |
| 53 | CMS Collaboration | Search for dark matter produced with an energetic jet or a hadronically decaying W or Z boson at $ \sqrt{s}= $ 13 TeV | JHEP 07 (2017) 014 | CMS-EXO-16-037 1703.01651 |
| 54 | J. H. Kuhn, A. Kulesza, S. Pozzorini, and M. Schulze | Electroweak corrections to hadronic photon production at large transverse momenta | JHEP 03 (2006) 059 | hep-ph/0508253 |
| 55 | S. Kallweit et al. | NLO electroweak automation and precise predictions for W+multijet production at the LHC | JHEP 04 (2015) 012 | 1412.5157 |
| 56 | S. Kallweit et al. | NLO QCD+EW predictions for V + jets including off-shell vector-boson decays and multijet merging | JHEP 04 (2016) 021 | 1511.08692 |
| 57 | CMS Collaboration | Measurement of the differential cross section for $ \mathrm{t \bar t} $ production in the dilepton final state at $ \sqrt{s}= $ 13 TeV | CMS-PAS-TOP-16-011 | CMS-PAS-TOP-16-011 |
| 58 | CMS Collaboration | Measurement of differential cross sections for top quark pair production using the lepton+jets final state in proton-proton collisions at 13 TeV | PRD95 (2017), no. 9, 092001 | CMS-TOP-16-008 1610.04191 |
| 59 | T. Junk | Confidence level computation for combining searches with small statistics | NIMA 434 (1999) 435 | hep-ex/9902006 |
| 60 | A. L. Read | Presentation of search results: the $ CL_s $ technique | JPG 28 (2002) 2693 | |
| 61 | G. Cowan, K. Cranmer, E. Gross, and O. Vitells | Asymptotic formulae for likelihood-based tests of new physics | EPJC 71 (2011) 1554 | 1007.1727 |
| 62 | SuperCDMS Collaboration Collaboration | New results from the search for low-mass weakly interacting massive particles with the CDMS Low Ionization Threshold Experiment | PRL 116 (Feb, 2016) 071301 | |
| 63 | LUX Collaboration Collaboration | Results from a search for dark matter in the complete LUX exposure | PRL 118 (Jan, 2017) 021303 | |
| 64 | XENON Collaboration Collaboration | First dark matter search results from the XENON1T experiment | PRL 119 (Oct, 2017) 181301 | |
| 65 | PandaX-II Collaboration Collaboration | Dark matter results from 54-ton-day exposure of PandaX-II experiment | PRL 119 (Oct, 2017) 181302 | |
| 66 | G. Angloher et al. | Results on light dark matter particles with a low-threshold CRESST-II detector | The European Physical Journal C 76 (Jan, 2016) 25 | |
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