Loading [MathJax]/jax/output/HTML-CSS/jax.js
CMS logoCMS event Hgg
Compact Muon Solenoid
LHC, CERN

CMS-PAS-HIG-20-004
Search for nonresonant Higgs boson pair production in the 4 leptons plus 2 b jets final state in proton-proton collisions at s= 13 TeV
Abstract: A search for nonresonant pair-production of Higgs bosons (HH) with one Higgs boson decaying into four leptons and the other into a pair of b quarks is presented. The analyzed data correspond to an integrated luminosity of 137 fb1 of proton-proton collisions at s= 13 TeV collected with the CMS detector during the years 2016 to 2018. An upper limit of 30 at 95% confidence level (CL) is set on the signal strength modifier μ, defined as the ratio of the observed double-Higgs boson production rate in the HHZZbˉb4bˉb decay channel to the standard model (SM) expectation. Possible modifications of the SM Higgs trilinear coupling are investigated and constrained to be within the observed (expected) range 9(10.5)<kλ<14(15.5) at 95% CL.
Figures & Tables Summary References CMS Publications
Figures

png pdf
Figure 1:
m(4) (left) and m(bˉb) (right) distributions. The m(bˉb) plot is done considering only events in the mass window: 115 GeV <m(4)< 135 GeV.

png pdf
Figure 1-a:
m(4) distribution.

png pdf
Figure 1-b:
m(bˉb) distribution. The plot is done considering only events in the mass window: 115 GeV <m(4)< 135 GeV.

png pdf
Figure 2:
Inclusive BDT distributions for signal, estimated background components, and data for the three different leptonic final state (4μ, 4e, and 2e2μ) and data taking years.

png pdf
Figure 3:
Left: upper limit on the signal strength at 95% CL for each year and for the combination. Right: Expected and observed 95% CL upper limits on the SM-like HH production cross section times B(HH4bˉb) obtained for different values of kλ. The green and yellow bands represent, respectively, the one and two standard deviation extensions around the expected limit.

png pdf
Figure 3-a:
Upper limit on the signal strength at 95% CL for each year and for the combination. The green and yellow bands represent, respectively, the one and two standard deviation extensions around the expected limit.

png pdf
Figure 3-b:
Expected and observed 95% CL upper limits on the SM-like HH production cross section times B(HH4bˉb) obtained for different values of kλ. The green and yellow bands represent, respectively, the one and two standard deviation extensions around the expected limit.
Tables

png pdf
Table 1:
Expected yields in the 4 signal region plus at least two jets after selection. Others contains contributions from TTW, WWZ, WZZ and ZZZ, processes.

png pdf
Table 2:
Summary of experimental systematic uncertainties. The effect of b tagging SF, JEC and JES is propagate to the shape of the BDT distribution, thus those uncertainties are treated as shape uncertainties.

png pdf
Table 3:
Summary of theory systematic uncertainties.
Summary
A search for nonresonant H boson pair production in the 4-lepton bˉb final state is presented. This search uses a data sample collected in proton-proton collisions at s= 13 TeV by the CMS detector during the years 2016 to 2018 that corresponds to an integrated luminosity of 137 fb1. The results are found to be compatible with the SM expectations, and an upper limit of 30 at the 95% CL is set on the signal strength modifier μ, defined as the observed double-H boson rate in the 4bˉb channel divided by the Standard Model (SM) expectation. Possible modifications of the SM Higgs trilinear coupling are investigated and constrained to be within the observed (expected) range 9(10.5)<kλ<14(15.5) at 95% CL.
References
1 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
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 ATLAS, CMS Collaboration Combined measurement of the Higgs boson mass in pp collisions at s= 7 and 8 TeV with the ATLAS and CMS experiments PRL 114 (2015) 191803 1503.07589
4 CMS Collaboration Measurements of properties of the Higgs boson decaying into the four-lepton final state in pp collisions at s= 13 TeV JHEP 11 (2017) 047 CMS-HIG-16-041
1706.09936
5 CMS Collaboration Combined measurements of Higgs boson couplings in proton--proton collisions at pp EPJC 79 (2019), no. 5, 421 CMS-HIG-17-031
1809.10733
6 J. Baglio et al. The measurement of the Higgs self-coupling at the LHC: theoretical status JHEP 04 (2013) 151 1212.5581
7 ATLAS Collaboration Search for higgs boson pair production in the γγbˉb final state using pp collision data at s= 8 TeV from the ATLAS detector PRL 114 (2015) 081802 1406.5053
8 ATLAS Collaboration Search for Higgs boson pair production in the bˉbbˉb final state from pp collisions at s= 8 TeV with the ATLAS detector EPJC 75 (2015) 412 1506.00285
9 ATLAS Collaboration Searches for Higgs boson pair production in the hhbbττ, γγWW, γγbb, bbbb channels with the ATLAS detector PRD 92 (2015) 092004 1509.04670
10 ATLAS Collaboration Search for pair production of Higgs bosons in the bˉbbˉb final state using proton--proton collisions at s= 13 TeV with the ATLAS detector PRD 94 (2016) 052002 1606.04782
11 CMS Collaboration Search for two Higgs bosons in final states containing two photons and two bottom quarks in proton-proton collisions at 8 TeV PRD 94 (2016) 052012 CMS-HIG-13-032
1603.06896
12 CMS Collaboration Search for resonant pair production of Higgs bosons decaying to two bottom quark-antiquark pairs in proton-proton collisions at 8 TeV PLB 749 (2015) 560 CMS-HIG-14-013
1503.04114
13 CMS Collaboration Search for a massive resonance decaying to a pair of Higgs bosons in the four b quark final state in proton-proton collisions at s= 13 TeV PLB 781 (2018) 244 1710.04960
14 CMS Collaboration Search for Higgs boson pair production in the bˉbττ final state in proton-proton collisions at s= 8 TeV PRD 96 (2017) 072004 CMS-HIG-15-013
1707.00350
15 CMS Collaboration Search for Higgs boson pair production in events with two bottom quarks and two tau leptons in proton--proton collisions at s= 13TeV PLB 778 (2018) 101 CMS-HIG-17-002
1707.02909
16 CMS Collaboration Search for resonant and nonresonant Higgs boson pair production in the bˉbνν final state in proton-proton collisions at s= 13 TeV JHEP 01 (2018) 054 CMS-HIG-17-006
1708.04188
17 CMS Collaboration Combined Higgs boson production and decay measurements with up to 137 fb1 of proton-proton collision data at s= 13 TeV CMS-PAS-HIG-19-005 CMS-PAS-HIG-19-005
18 S. Borowka et al. Higgs boson pair production in gluon fusion at next-to-leading order with full top-quark mass dependence PRL 117 (2016) 012001 1604.06447
19 S. Borowka et al. Full top quark mass dependence in Higgs boson pair production at NLO JHEP 10 (2016) 107 1608.04798
20 D. de Florian and J. Mazzitelli Higgs pair production at next-to-next-to-leading logarithmic accuracy at the LHC JHEP 09 (2015) 053 1505.07122
21 G. Degrassi, P. P. Giardino, and R. Grber On the two-loop virtual QCD corrections to Higgs boson pair production in the Standard Model EPJC76 (2016) 411 1603.00385
22 G. Heinrich et al. NLO predictions for Higgs boson pair production with full top quark mass dependence matched to parton showers JHEP 08 (2017) 088 1703.09252
23 G. Buchalla et al. Higgs boson pair production in non-linear Effective Field Theory with full mt-dependence at NLO QCD JHEP 09 (2018) 057 1806.05162
24 F. Goertz, A. Papaefstathiou, L. L. Yang, and J. Zurita Higgs boson pair production in the D=6 extension of the SM JHEP 04 (2015) 167 1410.3471
25 CMS Collaboration The CMS experiment at the CERN LHC JINST 3 (2008) S08004 CMS-00-001
26 S. Alioli, P. Nason, C. Oleari, and E. Re NLO vector-boson production matched with shower in POWHEG JHEP 07 (2008) 060 0805.4802
27 P. Nason A new method for combining NLO QCD with shower Monte Carlo algorithms JHEP 11 (2004) 040 hep-ph/0409146
28 S. Frixione, P. Nason, and C. Oleari Matching NLO QCD computations with parton shower simulations: the POWHEG method JHEP 11 (2007) 070 0709.2092
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 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 H. B. Hartanto, B. Jager, L. Reina, and D. Wackeroth Higgs boson production in association with top quarks in the POWHEG BOX PRD 91 (2015) 094003 1501.04498
32 J. M. Campbell et al. NLO Higgs boson production plus one and two jets using the POWHEG BOX, MadGraph4 and MCFM JHEP 07 (2012) 092 1202.5475
33 G. Luisoni, P. Nason, C. Oleari, and F. Tramontano HW±/HZ + 0 and 1 jet at NLO with the POWHEG BOX interfaced to GoSam and their merging within MiNLO JHEP 10 (2013) 083 1306.2542
34 Y. Gao et al. Spin determination of single-produced resonances at hadron colliders PRD 81 (2010) 075022 1001.3396
35 M. Grazzini, S. Kallweit, and D. Rathlev ZZ production at the LHC: fiducial cross sections and distributions in NNLO QCD PLB750 (2015) 407--410 1507.06257
36 J. M. Campbell and R. K. Ellis MCFM for the Tevatron and the LHC NPPS 205 (2010) 10 1007.3492
37 J. M. Campbell, R. K. Ellis, and C. Williams Bounding the Higgs width at the LHC using full analytic results for ggee+μμ+ JHEP 04 (2014) 060 1311.3589
38 M. Bonvini et al. Signal-background interference effects in ggHWW beyond leading order PRD 88 (2013) 034032 1304.3053
39 S. Catani and M. Grazzini An NNLO subtraction formalism in hadron collisions and its application to Higgs boson production at the LHC PRL 98 (2007) 222002 hep-ph/0703012
40 M. Grazzini NNLO predictions for the Higgs boson signal in the HWWνν and HZZ4 decay channels JHEP 02 (2008) 043 0801.3232
41 M. Grazzini and H. Sargsyan Heavy-quark mass effects in Higgs boson production at the LHC JHEP 09 (2013) 129 1306.4581
42 T. Sjostrand, S. Mrenna, and P. Skands PYTHIA 6.4 physics and manual JHEP 05 (2006) 026 hep-ph/0603175
43 T. Sjostrand et al. An introduction to PYTHIA 8.2 CPC 191 (2015) 159 1410.3012
44 CMS Collaboration Event generator tunes obtained from underlying event and multiparton scattering measurements EPJC 76 (2016) 155 CMS-GEN-14-001
1512.00815
45 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
46 NNPDF Collaboration Parton distributions for the LHC run II JHEP 04 (2015) 040 1410.8849
47 GEANT4 Collaboration GEANT4---a simulation toolkit NIMA 506 (2003) 250
48 J. Allison et al. GEANT4 developments and applications IEEE Trans. Nucl. Sci. 53 (2006) 270
49 CMS Collaboration Particle-flow reconstruction and global event description with the CMS detector JINST 12 (2017) P10003 CMS-PRF-14-001
1706.04965
50 CMS Collaboration Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at s= 8 TeV JINST 10 (2015) P06005 CMS-EGM-13-001
1502.02701
51 CMS Collaboration Performance of the CMS muon detector and muon reconstruction with proton-proton collisions at s= 13 TeV JINST 13 (2018) P06015 CMS-MUO-16-001
1804.04528
52 M. Cacciari, G. P. Salam, and G. Soyez The anti-kt jet clustering algorithm JHEP 04 (2008) 063 0802.1189
53 M. Cacciari, G. P. Salam, and G. Soyez FastJet user manual EPJC 72 (2012) 1896 1111.6097
54 CMS Collaboration Jet algorithms performance in 13 TeV data CMS-PAS-JME-16-003 CMS-PAS-JME-16-003
55 CMS Collaboration Determination of jet energy calibration and transverse momentum resolution in CMS JINST 6 (2011) P11002 CMS-JME-10-011
1107.4277
56 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
57 CMS Collaboration Jet energy scale and resolution performances with 13 TeV data CDS
58 BTAGPOG B-tagging for 2018 CMS Twiki (2018)
59 A. Hoecker et al. TMVA: toolkit for multivariate data analysis PoS ACAT (2007) 040 physics/0703039
60 CMS Collaboration Determination of jet energy calibration and transverse momentum resolution in CMS JINST 6 (2011) P11002 CMS-JME-10-011
1107.4277
61 M. Cepeda et al. Report from Working Group 2: Higgs Physics at the HL-LHC and HE-LHC volume 7, p. 221 12 1902.00134
62 M. Grazzini et al. Higgs boson pair production at NNLO with top quark mass effects JHEP 05 (2018) 059 1803.02463
63 A. L. Read Presentation of search results: the CLs technique JPG 28 (2002) 2693
64 T. Junk Confidence level computation for combining searches with small statistics NIMA 434 (1999) 435 hep-ex/9902006
65 G. Cowan, K. Cranmer, E. Gross, and O. Vitells Asymptotic formulae for likelihood-based tests of new physics EPJC 71 (2011) 1554 1007.1727
66 ATLAS and CMS Collaborations Procedure for the LHC Higgs boson search combination in summer 2011 CMS-NOTE-2011-005
Compact Muon Solenoid
LHC, CERN