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| CMS-EXO-20-012 ; CERN-EP-2023-064 | ||
| Search for resonances in events with photon and jet final states in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| 14 May 2023 | ||
| JHEP 12 (2023) 189 | ||
| Abstract: A search for resonances in events with the $ \gamma $+jet final state has been performed using proton-proton collision data collected at $ \sqrt{s} = $ 13 TeV by the CMS experiment at the LHC. The total data analyzed correspond to an integrated luminosity of 138 fb$ ^{-1} $. Models of excited quarks and quantum black holes are considered. Using a wide-jet reconstruction for the candidate jet, the $ \gamma $+jet invariant mass spectrum measured in data is examined for the presence of resonances over the standard model continuum background. The background is estimated by fitting this mass distribution with a functional form. The data exhibit no statistically significant deviations from the expected standard model background. Exclusion limits at 95% confidence level on the resonance mass and other parameters are set. Excited light-flavor quarks (excited bottom quarks) are excluded up to a mass of 6.0 (3.8) TeV. Quantum black hole production is excluded for masses up to 7.5 (5.2) TeV in the Arkani-Hamed--Dimopoulos--Dvali (Randall--Sundrum) model. These lower mass bounds are the most stringent to date among those obtained in the $ \gamma $+jet final state. | ||
| Links: e-print arXiv:2305.07998 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
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Figure 1:
Illustrative Feynman diagrams for qg $ \to\gamma $+jet resonance signal models of q*, b* (left), and QBH production (right). |
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Figure 1-a:
Illustrative Feynman diagram for qg $ \to\gamma $+jet resonance signal models of q*, b* production. |
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Figure 1-b:
Illustrative Feynman diagram for qg $ \to\gamma $+jet resonance signal models of QBH production. |
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Figure 2:
Distributions of reconstructed $ \gamma $+jet invariant mass for the q* and b* signal models with resonance mass of 4 TeV, and for QBH from the ADD and RS1 models with $ M_\text{th}= $ 4 TeV. |
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Figure 3:
The product of the cross section and branching fraction, $ \sigma\mathcal{B} $, as a function of the resonance mass of q* or b* signals ($ M_{\mathrm{q}^{*}} $ or $ M_{\mathrm{b}^{*}} $) or the threshold mass of QBH signal models ($ M_\text{th} $). |
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Figure 4:
The product of acceptance and efficiency for the q* signal in the inclusive category and the b* signal in the b tag and 0-b tag categories, for SM coupling $ f = $ 1.0 and for different resonance values (left), and the signal for the QBH (ADD/RS1) model in the inclusive category, for different $ M_\text{th} $ values (right), for the years 2016, 2017, and 2018. |
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Figure 4-a:
The product of acceptance and efficiency for the q* signal in the inclusive category and the b* signal in the b tag and 0-b tag categories, for SM coupling $ f = $ 1.0 and for different resonance values, for the years 2016, 2017, and 2018. |
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Figure 4-b:
The product of acceptance and efficiency for the signal for the QBH (ADD/RS1) model in the inclusive category, for different $ M_\text{th} $ values, for the years 2016, 2017, and 2018. |
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Figure 5:
Fit to the $ \gamma $+jet invariant mass distribution in data with Eq. 2 for the "inclusive" category of q* and QBH after all selections. Simulations of the q* signal with a 2 TeV mass and coupling $ f = $ 1.0, the QBH ADD signal with $ M_\text{th}= $ 3 TeV, and the QBH RS1 signal with $ M_\text{th}= $ 4 TeV are also shown. The lower panel shows the difference between the data yield and the background prediction divided by the statistical uncertainty of the data. The green (inner) and yellow (outer) bands, respectively, represent the 68 and 95% confidence level statistical uncertainties in the fit. |
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Figure 6:
Fits to the $ \gamma $+jet invariant mass distributions in data with Eq. 2 for the b* selection for the b tag category (left) and 0-b tag category (right). Simulations of b* signals are shown for mass values of 1.0 and 2.0 TeV and for $ f = $ 1.0. The lower panel shows the difference between the data yield and background prediction divided by the statistical uncertainty of the data. The green (inner) and yellow (outer) bands, respectively, represent the 68 and 95% confidence level statistical uncertainties in the fit. |
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Figure 6-a:
Fits to the $ \gamma $+jet invariant mass distributions in data with Eq. 2 for the b* selection for the b tag category. Simulations of b* signals are shown for mass values of 1.0 and 2.0 TeV and for $ f = $ 1.0. The lower panel shows the difference between the data yield and background prediction divided by the statistical uncertainty of the data. The green (inner) and yellow (outer) bands, respectively, represent the 68 and 95% confidence level statistical uncertainties in the fit. |
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Figure 6-b:
Fits to the $ \gamma $+jet invariant mass distributions in data with Eq. 2 for the b* selection for the 0-b tag category. Simulations of b* signals are shown for mass values of 1.0 and 2.0 TeV and for $ f = $ 1.0. The lower panel shows the difference between the data yield and background prediction divided by the statistical uncertainty of the data. The green (inner) and yellow (outer) bands, respectively, represent the 68 and 95% confidence level statistical uncertainties in the fit. |
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Figure 7:
The expected (dashed) and observed (solid) 95% CL upper limits on the product of the cross section and branching fraction, as functions of q* mass, for coupling strength $ f= $ 1.0 (upper left), $ f= $ 0.5 (upper right), and $ f= $ 0.1 (lower). The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit, respectively. The limits are compared with the theoretical predictions for q* production for the corresponding coupling strengths. |
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Figure 7-a:
The expected (dashed) and observed (solid) 95% CL upper limits on the product of the cross section and branching fraction, as functions of q* mass, for coupling strength $ f= $ 1.0. The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit, respectively. The limits are compared with the theoretical predictions for q* production for the corresponding coupling strengths. |
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Figure 7-b:
The expected (dashed) and observed (solid) 95% CL upper limits on the product of the cross section and branching fraction, as functions of q* mass, for coupling strength $ f= $ 0.5. The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit, respectively. The limits are compared with the theoretical predictions for q* production for the corresponding coupling strengths. |
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Figure 7-c:
The expected (dashed) and observed (solid) 95% CL upper limits on the product of the cross section and branching fraction, as functions of q* mass, for coupling strength $ f= $ 0.1. The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit, respectively. The limits are compared with the theoretical predictions for q* production for the corresponding coupling strengths. |
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Figure 8:
The expected (dashed) and observed (solid) 95% CL upper limits on the product of the cross section and branching fraction, as functions of b* mass, for coupling strength $ f= $ 1.0 (upper left), $ f= $ 0.5 (upper right), and $ f= $ 0.1 (lower). The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit, respectively. The limits are compared with the theoretical predictions for b* production for the corresponding coupling strengths. For coupling $ f= $ 1.0, the limits are compared for b* production by gauge interactions (red), contact interactions (violet), and total b* signal by the addition of these two production modes. |
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Figure 8-a:
The expected (dashed) and observed (solid) 95% CL upper limits on the product of the cross section and branching fraction, as functions of b* mass, for coupling strength $ f= $ 1.0. The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit, respectively. The limits are compared with the theoretical predictions for b* production for the corresponding coupling strengths. For this coupling, the limits are compared for b* production by gauge interactions (red), contact interactions (violet), and total b* signal by the addition of these two production modes. |
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Figure 8-b:
The expected (dashed) and observed (solid) 95% CL upper limits on the product of the cross section and branching fraction, as functions of b* mass, for coupling strength $ f= $ 0.5. The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit, respectively. The limits are compared with the theoretical predictions for b* production for the corresponding coupling strengths. |
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Figure 8-c:
The expected (dashed) and observed (solid) 95% CL upper limits on the product of the cross section and branching fraction, as functions of b* mass, for coupling strength $ f= $ 0.1. The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit, respectively. The limits are compared with the theoretical predictions for b* production for the corresponding coupling strengths. |
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Figure 9:
The expected (dashed) and observed (solid) 95% CL upper limit on the product of the cross section and branching fraction as a function of the minimum black hole mass for the ADD ($ n= $ 6) and RS1 ($ n= $ 1) models on the left and right, respectively. The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit. The limits are compared with the theoretical predictions for QBH production for ADD ($ n= $ 6) and RS1 ($ n= $ 1) models. |
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Figure 9-a:
The expected (dashed) and observed (solid) 95% CL upper limit on the product of the cross section and branching fraction as a function of the minimum black hole mass for the ADD ($ n= $ 6) model.The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit. The limits are compared with the theoretical predictions for QBH production for the ADD ($ n= $ 6) model. |
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Figure 9-b:
The expected (dashed) and observed (solid) 95% CL upper limit on the product of the cross section and branching fraction as a function of the minimum black hole mass for the RS1 ($ n= $ 1) model.The green (inner) and yellow (outer) bands correspond to 1 and 2 standard deviation uncertainties in the expected limit. The limits are compared with the theoretical predictions for QBH production for the RS1 ($ n= $ 1) model. |
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Figure 10:
The expected and observed 95% CL exclusion mass limit variation with the SM couplings for the excited q* and b* signal models. |
| Tables | |
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Table 1:
Systematic uncertainties in the signal yields for the mass range analyzed. |
| Summary |
| A search for resonances in the $ \gamma $+jet final state has been performed using proton-proton collision data at $ \sqrt{s} = $ 13 TeV, corresponding to an integrated luminosity of 138 fb$ ^{-1} $. Compared to previous searches in this final state, this analysis features improved b jet tagging efficiency and signal mass resolution, as well as a significantly larger data set. The results are compared with standard model extensions postulating excited quarks, excited b quarks, and quantum black holes. For the coupling strength $ f = $ 1.0, the observed (expected) lower mass bounds on the excited light-flavor quarks and excited bottom quarks from gauge interactions are estimated to be 6.0 (6.0) and 2.2 (2.3) TeV, respectively. For the same coupling strength, the observed lower mass bounds on the excited bottom quarks extends to 3.8 TeV, when the production mode from contact interactions is also considered. For quantum black hole production, observed exclusion limits are estimated to be 7.5 and 5.2 TeV for the Arkani-Hamed--Dimopoulos--Dvali and the Randall--Sundrum models with 6 and 1 extra dimensions, respectively. These lower mass bounds are extended compared to previous results by 0.4-0.8 TeV [13,16] and are the most stringent to date among those obtained in the $ \gamma $+jet final state. |
| References | ||||
| 1 | M. Shaposhnikov and A. Shkerin | Gravity, scale invariance and the hierarchy problem | JHEP 10 (2018) 024 | 1804.06376 |
| 2 | W. Buchmuller | Composite quarks and leptons | Acta Phys. Austriaca Suppl. 27 (1985) 517 | |
| 3 | U. Baur, I. Hinchliffe, and D. Zeppenfeld | Excited quark production at hadron colliders | Int. J. Mod. Phys. A 2 (1987) 1285 | |
| 4 | U. Baur, M. Spira, and P. M. Zerwas | Excited quark and lepton production at hadron colliders | PRD 42 (1990) 815 | |
| 5 | N. Arkani-Hamed, S. Dimopoulos, and G. R. Dvali | The hierarchy problem and new dimensions at a millimeter | PLB 429 (1998) 263 | hep-ph/9803315 |
| 6 | L. Randall and R. Sundrum | A large mass hierarchy from a small extra dimension | PRL 83 (1999) 3370 | hep-ph/9905221 |
| 7 | E. Eichten, I. Hinchliffe, K. D. Lane, and C. Quigg | Supercollider physics | Rev. Mod. Phys. 56 (1984) 579 | |
| 8 | S. Bhattacharya, S. S. Chauhan, B. C. Choudhary, and D. Choudhury | Quark excitations through the prism of direct photon plus jet at the LHC | PRD 80 (2009) 015014 | 0901.3927 |
| 9 | CMS Collaboration | Search for excited quarks in the $ \gamma $+jet final state in proton-proton collisions at $ \sqrt{s}= $ 8 TeV | PLB 738 (2014) 274 | CMS-EXO-13-003 1406.5171 |
| 10 | CMS Collaboration | Search for resonances and quantum black holes using dijet mass spectra in proton-proton collisions at $ \sqrt{s} = $ 8 TeV | PRD 91 (2015) 052009 | CMS-EXO-12-059 1501.04198 |
| 11 | CMS Collaboration | Search for narrow resonances decaying to dijets in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | PRL 116 (2016) 071801 | CMS-EXO-15-001 1512.01224 |
| 12 | CMS Collaboration | Search for high mass dijet resonances with a new background prediction method in proton-proton collisions at $ \sqrt{s}= $ 13 TeV | JHEP 05 (2020) 033 | CMS-EXO-19-012 1911.03947 |
| 13 | CMS Collaboration | Search for excited quarks of light and heavy flavor in $ \gamma $+jet final states in proton--proton collisions at $ \sqrt{s} = $ 13 TeV | PLB 781 (2018) 390 | CMS-EXO-17-002 1711.04652 |
| 14 | CMS Collaboration | Search for narrow resonances in the b-tagged dijet mass spectrum in proton-proton collisions at $ \sqrt{s} $ = 13 TeV | no.~1, 01, 2023 PRD 108 (2023) |
CMS-EXO-20-008 2205.01835 |
| 15 | ATLAS Collaboration | Search for new phenomena with photon+jet events in proton-proton collisions at $ \sqrt{s}= $ 13 TeV with the ATLAS detector | JHEP 03 (2016) 041 | 1512.05910 |
| 16 | ATLAS Collaboration | Search for new phenomena in high-mass final states with a photon and a jet from $ pp $ collisions at $ \sqrt{s} = $ 13 TeV with the ATLAS detector | EPJC 78 (2018) 102 | 1709.10440 |
| 17 | ATLAS Collaboration | Search for resonances in the mass distribution of jet pairs with one or two jets identified as b-jets in proton-proton collisions at $ \sqrt{s}= $ 13 TeV with the ATLAS detector | PRD 98 (2018) 032016 | 1805.09299 |
| 18 | ATLAS Collaboration | Search for new resonances in mass distributions of jet pairs using 139 fb$ ^{-1} $ of $ pp $ collisions at $ \sqrt{s}= $ 13 TeV with the ATLAS detector | JHEP 03 (2020) 145 | 1910.08447 |
| 19 | CDF Collaboration | Search for excited quarks in $ \text{p}\bar{\text{p}} $ collisions at $ \sqrt{s} = $ 1.8 TeV | PRL 72 (1994) 3004 | |
| 20 | CDF Collaboration | Search for new particles decaying to dijets at CDF | PRD 55 (1997) 5263 | hep-ex/9702004 |
| 21 | CDF Collaboration | Search for new particles decaying into dijets in proton-antiproton collisions at $ \sqrt{s} = $ 1.96 TeV | PRD 79 (2009) 112002 | 0812.4036 |
| 22 | D0 Collaboration | Search for new particles in the two jet decay channel with the D0 detector | PRD 69 (2004) 111101 | hep-ex/0308033 |
| 23 | S. Dimopoulos and G. L. Landsberg | Black holes at the LHC | PRL 87 (2001) 161602 | hep-ph/0106295 |
| 24 | X. Calmet, W. Gong, and S. D. H. Hsu | Colorful quantum black holes at the LHC | PLB 668 (2008) 20 | 0806.4605 |
| 25 | P. Meade and L. Randall | Black holes and quantum gravity at the LHC | JHEP 05 (2008) 003 | 0708.3017 |
| 26 | CMS Collaboration | Search for black holes in high-multiplicity final states in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | PLB 774 (2017) 279 | CMS-EXO-15-007 1705.01403 |
| 27 | CMS Collaboration | Search for new physics with dijet angular distributions in proton-proton collisions at $ \sqrt{s}= $ 13 TeV | JHEP 07 (2017) 013 | CMS-EXO-15-009 1703.09986 |
| 28 | CMS Collaboration | Search for new physics in dijet angular distributions using proton-proton collisions at $ \sqrt{s}= $ 13 TeV and constraints on dark matter and other models | EPJC 78 (2018) 789 | CMS-EXO-16-046 1803.08030 |
| 29 | ATLAS Collaboration | Search for new phenomena in dijet events using 37 fb$ ^{-1} $ of $ pp $ collision data collected at $ \sqrt{s}= $13 TeV with the ATLAS detector | PRD 96 (2017) 052004 | 1703.09127 |
| 30 | CMS Collaboration | HEPData record for this analysis | link | |
| 31 | CMS Collaboration | Performance of photon reconstruction and identification with the CMS detector in proton-proton collisions at $ \sqrt{s} = $ 8 TeV | JINST 10 (2015) P08010 | CMS-EGM-14-001 1502.02702 |
| 32 | CMS Collaboration | Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV | JINST 12 (2017) P02014 | CMS-JME-13-004 1607.03663 |
| 33 | CMS Collaboration | The CMS experiment at the CERN LHC | JINST 3 (2008) S08004 | |
| 34 | CMS Collaboration | Performance of the CMS Level-1 trigger in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | JINST 15 (2020) P10017 | CMS-TRG-17-001 2006.10165 |
| 35 | CMS Collaboration | The CMS trigger system | JINST 12 (2017) P01020 | CMS-TRG-12-001 1609.02366 |
| 36 | GEANT 4 Collaboration | GEANT 4---a simulation toolkit | NIM A 506 (2003) 250 | |
| 37 | CMS Collaboration | Event generator tunes obtained from underlying event and multiparton scattering measurements | EPJC 76 (2016) 155 | CMS-GEN-14-001 1512.00815 |
| 38 | CMS Collaboration | Extraction and validation of a new set of CMS PYTHIA8 tunes from underlying-event measurements | EPJC 80 (2020) 4 | CMS-GEN-17-001 1903.12179 |
| 39 | NNPDF Collaboration | Parton distributions for the LHC Run II | JHEP 04 (2015) 040 | 1410.8849 |
| 40 | NNPDF Collaboration | Parton distributions from high-precision collider data | EPJC 77 (2017) 663 | 1706.00428 |
| 41 | T. Sjöstrand et al. | An introduction to PYTHIA 8.2 | Comput. Phys. Commun. 191 (2015) 159 | 1410.3012 |
| 42 | D. M. Gingrich | Quantum black holes with charge, colour, and spin at the LHC | JPG 37 (2010) 105008 | 0912.0826 |
| 43 | J. Pumplin et al. | New generation of parton distributions with uncertainties from global QCD analysis | JHEP 07 (2002) 012 | hep-ph/0201195 |
| 44 | 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 |
| 45 | J. Alwall et al. | Comparative study of various algorithms for the merging of parton showers and matrix elements in hadronic collisions | EPJC 53 (2008) 473 | 0706.2569 |
| 46 | CMS Collaboration | Particle-flow reconstruction and global event description with the CMS detector | JINST 12 (2017) P10003 | CMS-PRF-14-001 1706.04965 |
| 47 | CMS Collaboration | Electron and photon reconstruction and identification with the CMS experiment at the CERN LHC | JINST 16 (2021) P05014 | CMS-EGM-17-001 2012.06888 |
| 48 | M. Cacciari, G. P. Salam, and G. Soyez | The anti-$ k_{\mathrm{T}} $ jet clustering algorithm | JHEP 04 (2008) 063 | 0802.1189 |
| 49 | M. Cacciari, G. P. Salam, and G. Soyez | FastJet user manual | EPJC 72 (2012) 1896 | 1111.6097 |
| 50 | CMS Collaboration | Technical proposal for the Phase-II upgrade of the Compact Muon Solenoid | CMS Technical Proposal CERN-LHCC-2015-010, CMS-TDR-15-02, 2015 CDS |
|
| 51 | CMS Collaboration | Jet algorithms performance in 13 TeV data | CMS Physics Analysis Summary, 2017 CMS-PAS-JME-16-003 |
CMS-PAS-JME-16-003 |
| 52 | CMS Collaboration | Identification of heavy-flavour jets with the CMS detector in pp collisions at 13 TeV | JINST 13 (2018) P05011 | CMS-BTV-16-002 1712.07158 |
| 53 | E. Bols et al. | Jet flavour classification using DeepJet | JINST 15 (2020) P12012 | 2008.10519 |
| 54 | Tracker Group of the CMS Collaboration | The CMS phase-1 pixel detector upgrade | JINST 16 (2021) P02027 | 2012.14304 |
| 55 | CMS Collaboration | CMS technical design report for the Phase 1 upgrade of the hadron calorimeter | CMS Technical Design Report CERN-LHCC-2012-015 / CMS-TDR-010, 2012 CDS |
|
| 56 | R. A. Fisher | On the interpretation of $ \chi^{2} $ from contingency tables, and the calculation of p | J. Roy. Stat. Soc. 85 (1922) 87 | |
| 57 | CMS Collaboration | Precision luminosity measurement in proton-proton collisions at $ \sqrt{s} = $ 13 TeV in 2015 and 2016 at CMS | EPJC 81 (2021) 800 | CMS-LUM-17-003 2104.01927 |
| 58 | CMS Collaboration | CMS luminosity measurement for the 2017 data-taking period | CMS Physics Analysis Summary, 2018 link |
CMS-PAS-LUM-17-004 |
| 59 | CMS Collaboration | CMS luminosity measurement for the 2018 data-taking period | CMS Physics Analysis Summary, 2019 link |
CMS-PAS-LUM-18-002 |
| 60 | CMS Collaboration | Measurement of the inelastic proton-proton cross section at $ \sqrt{s}= $ 13 TeV | JHEP 07 (2018) 161 | CMS-FSQ-15-005 1802.02613 |
| 61 | T. Junk | Confidence level computation for combining searches with small statistics | NIM A 434 (1999) 435 | hep-ex/9902006 |
| 62 | A. L. Read | Presentation of search results: the $ \text{CL}_\text{s} $ technique | JPG 28 (2002) 2693 | |
| 63 | LHC Higgs Combination Group | Procedure for the LHC Higgs boson search combination in Summer 2011 | Technical Report CMS-NOTE-2011-005, ATL-PHYS-PUB-2011-11, 2011 | |
| 64 | G. Cowan, K. Cranmer, E. Gross, and O. Vitells | Asymptotic formulae for likelihood-based tests of new physics | EPJC 71 (2011) 1554 | 1007.1727 |
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