Compact Muon Solenoid
LHC, CERN
Visit us: CMS Public Website, CMS Physics ;
Contact us: CMS Publications Committee
| CMS-PAS-HIG-21-014 | ||
| Search for nonresonant Higgs boson pair production in the WW$ \gamma\gamma $ channel in pp collisions at $ \sqrt{s}= $ 13 TeV | ||
| CMS Collaboration | ||
| 15 November 2022 | ||
| Abstract: A search for nonresonant production of Higgs boson pairs in final states with two W bosons and two photons is presented. The search uses data from proton-proton collisions at a center-of-mass energy of $ \sqrt{s}= $ 13 TeV, recorded with the CMS detector at the LHC between 2016 and 2018, which correspond to an integrated luminosity of 138 fb$^{-1}$. This is the first search performed in this final state by the CMS collaboration. The observed (expected) 95% confidence level (CL) upper limit on Higgs boson pair production cross-section is evaluated to be 3.0 (1.6) pb, corresponding to about 97 (53) times the standard model prediction. Scans of modified SM and purely beyond SM (BSM) coupling parameters in an effective field theory framework result in an observed (expected) constraint on the Higgs boson self-coupling strength of -25.8 (-14.4) to 24.1 (18.3) times its SM value, and a constraint on the magnitude of a direct coupling of two top quarks to two Higgs bosons of -2.4 (-1.7) to 2.9 (2.2) at a 95% CL. Additionally, observed (expected) 95% CL upper limits are placed on twenty effective field theory BSM benchmark scenarios ranging from 1.7 to 6.2 (1.0 to 3.9) pb. | ||
| Links: CDS record (PDF) ; CADI line (restricted) ; | ||
| Figures | |
png pdf |
Figure 1:
Feynman diagrams for leading-order Higgs boson pair production via ggF production. |
png pdf |
Figure 1-a:
Feynman diagrams for leading-order Higgs boson pair production via ggF production. |
png pdf |
Figure 1-b:
Feynman diagrams for leading-order Higgs boson pair production via ggF production. |
png pdf |
Figure 1-c:
Feynman diagrams for leading-order Higgs boson pair production via ggF production. |
png pdf |
Figure 1-d:
Feynman diagrams for leading-order Higgs boson pair production via ggF production. |
png pdf |
Figure 1-e:
Feynman diagrams for leading-order Higgs boson pair production via ggF production. |
png pdf |
Figure 2:
Data/MC comparison of the FH WW$ \gamma\gamma $ identifier DNN score in diphoton mass region 100 $ < m_{\gamma\gamma} < $ 180 GeV. Simulated background events are only used for the classifier training and not for the final signal extraction. MC statistical uncertainty is shown as grey shaded band, and data statistical uncertainty is shown as bar on the ratio points. |
png pdf |
Figure 3:
Data/MC comparison of the SL DNN score in diphoton mass region 100 $ < m_{\gamma\gamma} < $ 180 GeV. Simulated background events are only used for the classifier training and not for the final signal extraction. MC statistical uncertainty is shown as grey shaded band, and data statistical uncertainty is shown as bar on the ratio points. |
png pdf |
Figure 4:
Data/MC comparison of dilepton invariant mass $ m_{ll} $ in the FL channel after preselection. The main non-resonant background is the Drell-Yan process, and the main resonant background is the VH(H$ \rightarrow\gamma\gamma $) process, both concentrated in the region between 80 GeV and 100 GeV. Simulated backgrounds are only used in event selection optimization and not for the final signal extraction. MC statistical uncertainty is shown as grey shaded band, and data statistical uncertainty is shown as bar on the ratio points. |
png pdf |
Figure 5:
SL signal model, defined as a fit of a sum of up to five Gaussians in a binned $ m_{\gamma\gamma} $ distribution, in the most sensitive DNN category. |
png pdf |
Figure 6:
FH signal model, defined as a fit of a sum of up to five Gaussians in a binned $ m_{\gamma\gamma} $ distribution, in the second most sensitive DNN category. |
png pdf |
Figure 7:
FL signal model, defined as a fit of a sum of up to five Gaussians in a binned $ m_{\gamma\gamma} $ distribution. |
png pdf |
Figure 8:
The observed diphoton mass distribution including the signal plus background fit (red), the Single-Higgs + continuum background fit (blue) and the continuum background (black dashed line), with bands covering the $ \pm $1$\sigma $ and $ \pm $2$\sigma $ uncertainties in the fitted background. All analysis categories are combined and weighted by S$ / $(S$ + $B). |
png pdf |
Figure 9:
Run 2 95% CL limits on HH gluon fusion production with respect to $ \sigma_{SM}^{NLO} $ = 31.05 fb |
png pdf |
Figure 10:
95% CL upper limit scan of $ \kappa_{\lambda} $ hypotheses from -30 to 30, shown for each WW$ \gamma\gamma $ channel, and for the combined result. |
png pdf |
Figure 10-a:
95% CL upper limit scan of $ \kappa_{\lambda} $ hypotheses from -30 to 30, shown for each WW$ \gamma\gamma $ channel, and for the combined result. |
png pdf |
Figure 10-b:
95% CL upper limit scan of $ \kappa_{\lambda} $ hypotheses from -30 to 30, shown for each WW$ \gamma\gamma $ channel, and for the combined result. |
png pdf |
Figure 11:
95% CL upper limit scan of $ c_{2} $ hypotheses from -3 to 3, shown for each WW$ \gamma\gamma $ channel, and for the combined result. |
png pdf |
Figure 11-a:
95% CL upper limit scan of $ c_{2} $ hypotheses from -3 to 3, shown for each WW$ \gamma\gamma $ channel, and for the combined result. |
png pdf |
Figure 11-b:
95% CL upper limit scan of $ c_{2} $ hypotheses from -3 to 3, shown for each WW$ \gamma\gamma $ channel, and for the combined result. |
png pdf |
Figure 12:
Run 2 95% CL limits on HH gluon fusion production for different nonresonant benchmark models defined in Table 5. |
| Tables | |
png pdf |
Table 1:
Parameter values of the 20 EFT benchmarks and the Standard Model. |
png pdf |
Table 2:
2017 simulated signal and background event yields (process efficiencies) before and after FH preselections. |
png pdf |
Table 3:
2017 simulated signal and background event yields (process efficiencies) before and after SL preselections. |
png pdf |
Table 4:
2017 simulated signal and background event yields (process efficiencies) before and after FL preselections. |
png pdf |
Table 5:
Upper limits on $ \frac{\sigma(HH)}{\sigma_{SM}(HH)} $, assuming an NLO cross-section prediction of $ \sigma_{SM}(HH) $ = 31.05 fb. |
| Summary |
| In this note, the first search for Higgs pair production in the WW$ \gamma\gamma $ final state performed by the CMS collaboration has been presented. The analysis makes use of data collected with the CMS detector between 2016 and 2018 corresponding to an integrated luminosity of 138 fb$^{-1}$, from proton-proton collisions at a center-of-mass energy of 13 TeV. Combining all final state categories, which makes use of all three WW decay modes, results in an observed (expected) 95% CL upper limit on the di-Higgs production cross-section of 3.0 (1.6) pb, corresponding to about 97 (53) times the standard model prediction. Scans of modified SM and purely BSM coupling parameters in an EFT framework result in an observed (expected) constraint on the Higgs self-coupling of -25.8 (-14.4) to 24.1 (18.3) times its standard model value, and a constraint on the magnitude of the direct coupling of two top quarks to two Higgs bosons of -2.4 (-1.7) to 2.9 (2.2) at a 95% CL. Additionally, observed (expected) 95% CL upper limits are placed on twenty EFT benchmark scenarios ranging from 1.7 - 6.2 (1.0 - 3.9) pb. |
| References | ||||
| 1 | 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 |
| 2 | 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 |
| 3 | 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 |
| 4 | T. Markkanen, A. Rajantie, and S. Stopyra | Cosmological Aspects of Higgs Vacuum Metastability | Front. Astron. Space Sci. 5 (2018) 40 | 1809.06923 |
| 5 | LHC Higgs Cross Section Working Group Collaboration | Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector | link | 1610.07922 |
| 6 | A. Carvalho et al. | Higgs Pair Production: Choosing Benchmarks With Cluster Analysis | JHEP 04 (2016) 126 | 1507.02245 |
| 7 | G. Buchalla et al. | Higgs boson pair production in non-linear Effective Field Theory with full $ m_t $-dependence at NLO QCD | JHEP 09 (2018) 057 | 1806.05162 |
| 8 | M. Capozi and G. Heinrich | Exploring anomalous couplings in Higgs boson pair production through shape analysis | JHEP 03 (2020) 091 | 1908.08923 |
| 9 | ATLAS Collaboration | Search for Higgs boson pair production in the $ \gamma\gamma WW^{*} $ channel using $ pp $ collision data recorded at $ \sqrt{s} = $ 13 TeV with the ATLAS detector | EPJC 78 (2018) | 1807.08567 |
| 10 | CMS Collaboration | The CMS Experiment at the CERN LHC | JINST 3 (2008) S08004 | |
| 11 | 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 |
| 12 | CMS Collaboration | The CMS trigger system | JINST 12 (2017) P01020 | CMS-TRG-12-001 1609.02366 |
| 13 | 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 |
| 14 | CMS Collaboration | A measurement of the Higgs boson mass in the diphoton decay channel | PLB 805 (2020) 135425 | CMS-HIG-19-004 2002.06398 |
| 15 | 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 |
| 16 | CMS Collaboration | CMS luminosity measurement for the 2017 data-taking period at $ \sqrt{s} $ = 13 TeV | CMS Physics Analysis Summary, 2018 link |
CMS-PAS-LUM-17-004 |
| 17 | CMS Collaboration | CMS luminosity measurement for the 2018 data-taking period at $ \sqrt{s} $ = 13 TeV | CMS Physics Analysis Summary, 2019 link |
CMS-PAS-LUM-18-002 |
| 18 | M. Mangano | TASI Lectures on Future Colliders | PoS TASI 008, 2019 | 1905.07489 |
| 19 | A. Carvalho et al. | Analytical parametrization and shape classification of anomalous HH production in the EFT approach | link | 1608.06578 |
| 20 | G. Degrassi, P. P. Giardino, F. Maltoni, and D. Pagani | Probing the Higgs self coupling via single Higgs production at the LHC | JHEP 12 (2016) 080 | 1607.04251 |
| 21 | F. Maltoni, D. Pagani, A. Shivaji, and X. Zhao | Trilinear Higgs coupling determination via single-Higgs differential measurements at the LHC | EPJC 77 (2017) 887 | 1709.08649 |
| 22 | CMS Collaboration | Measurements of Higgs boson properties in the diphoton decay channel in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | JHEP 11 (2018) 185 | CMS-HIG-16-040 1804.02716 |
| 23 | P. Nason | A New method for combining NLO QCD with shower Monte Carlo algorithms | JHEP 11 (2004) 040 | hep-ph/0409146 |
| 24 | S. Frixione, P. Nason, and C. Oleari | Matching NLO QCD computations with Parton Shower simulations: the POWHEG method | JHEP 11 (2007) 070 | 0709.2092 |
| 25 | 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 |
| 26 | G. Heinrich et al. | Probing the trilinear Higgs boson coupling in di-Higgs production at NLO QCD including parton shower effects | JHEP 06 (2019) 066 | 1903.08137 |
| 27 | 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 |
| 28 | P. Artoisenet, R. Frederix, O. Mattelaer, and R. Rietkerk | Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations | JHEP 03 (2013) 015 | 1212.3460 |
| 29 | R. Frederix and S. Frixione | Merging meets matching in MC@NLO | JHEP 12 (2012) 061 | 1209.6215 |
| 30 | P. Nason and C. Oleari | NLO Higgs boson production via vector-boson fusion matched with shower in POWHEG | JHEP 02 (2010) 037 | 0911.5299 |
| 31 | T. Sjöstrand et al. | An introduction to PYTHIA 8.2 | Comput. Phys. Commun. 191 (2015) 159 | 1410.3012 |
| 32 | Sherpa Collaboration | Event Generation with Sherpa 2.2 | SciPost Phys. 7 (2019) 034 | 1905.09127 |
| 33 | CMS Collaboration | Event generator tunes obtained from underlying event and multiparton scattering measurements | EPJC 76 (2016) 155 | CMS-GEN-14-001 1512.00815 |
| 34 | 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 |
| 35 | NNPDF Collaboration | Parton distributions for the LHC Run II | JHEP 04 (2015) 040 | 1410.8849 |
| 36 | GEANT4 Collaboration | GEANT4--a simulation toolkit | NIM A 506 (2003) 250 | |
| 37 | CMS Collaboration | Particle-flow reconstruction and global event description with the CMS detector | JINST 12 (2017) P3 | CMS-PRF-14-001 1706.04965 |
| 38 | CMS Collaboration | Observation of the Diphoton Decay of the Higgs Boson and Measurement of Its Properties | EPJC 74 (2014) 3076 | CMS-HIG-13-001 1407.0558 |
| 39 | CMS Collaboration | Description and performance of track and primary-vertex reconstruction with the CMS tracker | JINST 9 (2014) P9 | CMS-TRK-11-001 1405.6569 |
| 40 | M. Cacciari, G. P. Salam, and G. Soyez | The anti-$ k_{\mathrm{T}} $ jet clustering algorithm | JHEP 04 (2008) 063 | 0802.1189 |
| 41 | M. Cacciari, G. P. Salam, and G. Soyez | FastJet user manual | EPJC 72 (2012) 1896 | 1111.6097 |
| 42 | 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 |
| 43 | CMS Collaboration | Measurements of $ \mathrm{t\bar{t}}H $ Production and the CP Structure of the Yukawa Interaction between the Higgs Boson and Top Quark in the Diphoton Decay Channel | PRL 125 (2020) 061801 | CMS-HIG-19-013 2003.10866 |
| 44 | P. D. Dauncey, M. Kenzie, N. Wardle, and G. J. Davies | Handling uncertainties in background shapes: the discrete profiling method | JINST 10 (2015) P04015 | 1408.6865 |
| 45 | M. Grazzini et al. | Higgs boson pair production at NNLO with top quark mass effects | JHEP 05 (2018) 059 | 1803.02463 |
| 46 | CMS Collaboration | Performance of Electron Reconstruction and Selection with the CMS Detector in Proton-Proton Collisions at \ensuremath\sqrts = 8 TeV | JINST 10 (2015) P06005 | CMS-EGM-13-001 1502.02701 |
| 47 | CMS Collaboration | Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at $ \sqrt{s}= $ 13 TeV | JINST 13 (2018) P06015 | CMS-MUO-16-001 1804.04528 |
| 48 | CMS Collaboration | Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV | JINST 12 (2017) P0 | CMS-JME-13-004 1607.03663 |
| 49 | A. L. Read | Presentation of search results: The CL(s) technique | JPG 28 (2002) 2693 | |
| 50 | T. Junk | Confidence level computation for combining searches with small statistics | NIM A 434 (1999) 435 | hep-ex/9902006 |
| 51 | G. Cowan, K. Cranmer, E. Gross, and O. Vitells | Asymptotic formulae for likelihood-based tests of new physics | [Erratum: EPJC 73 (2011) 2501] EPJC 71 (2011) 1554 |
1007.1727 |
|
|
Compact Muon Solenoid LHC, CERN |
|
|
|
|
|
|