CMS-PAS-HIG-17-032

CMS-PAS-HIG-17-032
Search for resonant double Higgs production with $\mathrm{ b\bar{b}ZZ^{*} } $ decays in the $\mathrm{ b\bar{b} \ell\ell\nu\nu }$ final state
CMS Collaboration
November 2018

Abstract: A search for the resonant double Higgs boson production is performed using 2016 data collected with the CMS experiment at $\sqrt{s} = $ 13 TeV corresponding to an integrated luminosity of 35.9 fb$^{-1}$. Events in which one Higgs boson decays to a pair of b quarks, and the other Higgs boson to a pair of Z bosons are studied. Decays to electron and muon pairs are selected to reconstruct an on-shell Z boson, while the other Z boson is allowed to be off-shell and required to decay to neutrinos: $\mathrm{ X \to HH \to b\bar{b}ZZ^{*} \to b\bar{b} \ell\ell\nu\nu }$. Limits are set on the resonant double Higgs boson production cross section for a resonance with a mass in the range from 250 to 1000 GeV for spin 0 and spin 2 hypotheses.
Links: CDS record (PDF) ; inSPIRE record ; CADI line (restricted) ;

Figures & Tables	Summary	References	CMS Publications

Figures
png pdf	Figure 1: Transverse mass of the reconstructed HH candidates for data, the simulated signal graviton sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results. The top row shows the figures for the muon channel while the bottom row is for the electron channel. For each row, the left plot is for the Drell-Yan control region, the middle is for the ${{\mathrm {t}\overline {\mathrm {t}}}}$ control region, and the right is for the signal region. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 1-a: Transverse mass of the reconstructed HH candidates for data, the simulated signal graviton sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, in the Drell-Yan control region, for the muon channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 1-b: Transverse mass of the reconstructed HH candidates for data, the simulated signal graviton sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, in the ${{\mathrm {t}\overline {\mathrm {t}}}}$ control region, for the muon channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 1-c: Transverse mass of the reconstructed HH candidates for data, the simulated signal graviton sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, in the signal region, for the muon channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 1-d: Transverse mass of the reconstructed HH candidates for data, the simulated signal graviton sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, in the Drell-Yan control region, for the electron channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 1-e: Transverse mass of the reconstructed HH candidates for data, the simulated signal graviton sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, ${{\mathrm {t}\overline {\mathrm {t}}}}$ control region, for the electron channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 1-f: Transverse mass of the reconstructed HH candidates for data, the simulated signal graviton sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, signal region, for the electron channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 2: Transverse mass of the reconstructed HH candidates for data, the simulated signal radion sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results. The top row shows the plots for the muon channel while the bottom row is for the electron channel. For each row, the left plot is for the Drell-Yan control region, the middle is for the ${{\mathrm {t}\overline {\mathrm {t}}}}$ control region, and the right is for the signal region. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 2-a: Transverse mass of the reconstructed HH candidates for data, the simulated signal radion sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, in the Drell-Yan control region, for the muon channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 2-b: Transverse mass of the reconstructed HH candidates for data, the simulated signal radion sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, in the ${{\mathrm {t}\overline {\mathrm {t}}}}$ control region, for the muon channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 2-c: Transverse mass of the reconstructed HH candidates for data, the simulated signal radion sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, in the signal region, for the muon channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 2-d: Transverse mass of the reconstructed HH candidates for data, the simulated signal radion sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, in the Drell-Yan control region, for the electron channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 2-e: Transverse mass of the reconstructed HH candidates for data, the simulated signal radion sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, in the ${{\mathrm {t}\overline {\mathrm {t}}}}$ control region, for the electron channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 2-f: Transverse mass of the reconstructed HH candidates for data, the simulated signal radion sample for the 300 GeV mass hypothesis, and simulated backgrounds scaled according to the fit results, in the signal region, for the electron channel. Signal normalization choice is discussed in the text. The crosshatched area represents the sum of statistical and systematic uncertainties.
png pdf	Figure 3: Expected (dashed line) and observed (solid line) limits on the cross section of a resonant HH production as a function of the mass of the narrow resonance for both leptonic channels combined. Graviton case is shown at the top and radion case at the bottom. The red line shows a theoretical prediction for the production of a Warped Extra Dimensions particle with certain model assumptions [14].
png pdf	Figure 3-a: Expected (dashed line) and observed (solid line) limits on the cross section of a resonant HH production as a function of the mass of the narrow resonance for both leptonic channels combined. Shown is the graviton case. The red line shows a theoretical prediction for the production of a Warped Extra Dimensions particle with certain model assumptions [14].
png pdf	Figure 3-b: Expected (dashed line) and observed (solid line) limits on the cross section of a resonant HH production as a function of the mass of the narrow resonance for both leptonic channels combined. Shown is the radion case. The red line shows a theoretical prediction for the production of a Warped Extra Dimensions particle with certain model assumptions [14].

Tables
png pdf	Table 1: The expected and observed HH production cross section upper limits at 95% CL for different narrow resonance graviton (top) and radion (bottom) mass hypotheses for both dielectron and dimuon channels combined.

Summary

This note presents a search for the production of two Higgs bosons through narrow resonances, a KK graviton (spin-2) and a radion (spin-0), where one of the Higgs bosons decays to two b quarks while the other decays to a pair of Z bosons which, in turn, decay to a pair of neutrinos and a pair of electrons or muons. The search is performed with the 35.9 fb$^{-1}$ of 2016 data set collected by the CMS experiment at the LHC in proton-proton collisions at $\sqrt{s} = $ 13 TeV.

No statistically significant deviations from the SM predictions for background processes have been observed, and 95% upper confidence limits are reported for production cross section of a KK graviton/radion times the branching fraction of the subsequent decay into an HH system. The limits are derived for resonance masses in the 250 GeV to 1 TeV range.

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	A. Salam and J. C. Ward	On a gauge theory of elementary interactions	Nuovo Cim. 19 (1961) 165
4	S. Glashow	Partial symmetries of weak interactions	Nucl.Phys. 22 (1961) 579
5	S. Weinberg	A model of leptons	Phys.Rev.Lett. 19 (1967) 1264
6	CDF, D0 Collaboration, B. Tuchming	Higgs boson production and properties at the Tevatron	in Proceedings, 49th Rencontres de Moriond on QCD and High Energy Interactions: La Thuile, Italy, March 22-29, 2014, p. 3 2014	1405.5058
7	ATLAS and CMS Collaborations	Measurements of the Higgs boson production and decay rates and constraints on its couplings from a combined ATLAS and CMS analysis of the LHC pp collision data at $ \sqrt{s}= $ 7 and 8 TeV	JHEP 08 (2016) 045	1606.02266
8	LHC Higgs Cross Section Working Group Collaboration	Handbook of LHC Higgs Cross Sections: 4. Deciphering the Nature of the Higgs Sector		1610.07922
9	S. Borowka et al.	Higgs boson pair production in gluon fusion at next-to-leading order with full top-quark mass dependence	PRL 117 (Jun, 2016) 012001
10	J. Grigo, K. Melnikov, and M. Steinhauser	Virtual corrections to Higgs boson pair production in the large top quark mass limit	Nucl.Phys.B 888 (2014) 17	1408.2422
11	M. J. Dolan, C. Englert, and M. Spannowsky	New Physics in LHC Higgs boson pair production	PRD 87 (2013) 055002	1210.8166
12	P. Huang, A. Joglekar, M. Li, and C. E. M. Wagner	Corrections to di-higgs boson production with light stops and modified higgs couplings	PRD 97 (Apr, 2018) 075001
13	S. Kanemura et al.	Single and double production of the Higgs boson at hadron and lepton colliders in minimal composite Higgs models	PRD 94 (2016) 015028	1603.05588
14	A. Oliveira	Gravity particles from Warped Extra Dimensions, predictions for LHC		1404.0102
15	L. Randall and R. Sundrum	Large mass hierarchy from a small extra dimension	PRL 83 (Oct, 1999) 3370
16	K. Agashe, H. Davoudiasl, G. Perez, and A. Soni	Warped Gravitons at the LHC and Beyond	PRD 76 (2007) 036006	hep-ph/0701186
17	A. L. Fitzpatrick, J. Kaplan, L. Randall, and L.-T. Wang	Searching for the Kaluza-Klein Graviton in Bulk RS Models	JHEP 09 (2007) 013	hep-ph/0701150
18	O. Antipin, D. Atwood, and A. Soni	Search for RS gravitons via W(L)W(L) decays	PLB 666 (2008) 155	0711.3175
19	H. Davoudiasl, J. L. Hewett, and T. G. Rizzo	Phenomenology of the Randall-Sundrum Gauge Hierarchy Model	PRL 84 (2000) 2080	hep-ph/9909255
20	CMS Collaboration	The CMS trigger system	JINST 12 (2017) P01020	CMS-TRG-12-001 1609.02366
21	CMS Collaboration	The CMS experiment at the CERN LHC	JINST 3 (2008) S08004	CMS-00-001
22	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
23	S. Alioli, P. Nason, C. Oleari, and E. Re	NLO single-top production matched with shower in POWHEG: s- and t-channel contributions	JHEP 09 (2009) 111	0907.4076
24	P. Nason	A New method for combining NLO QCD with shower Monte Carlo algorithms	JHEP 11 (2004) 040	hep-ph/0409146
25	S. Frixione, P. Nason, and C. Oleari	Matching NLO QCD computations with Parton Shower simulations: the POWHEG method	JHEP 11 (2007) 070	0709.2092
26	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
27	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
28	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
29	T. Sjostrand, S. Mrenna, and P. Z. Skands	A Brief Introduction to PYTHIA 8.1	CPC 178 (2008) 852	0710.3820
30	T. Sjostrand et al.	An Introduction to PYTHIA 8.2	CPC 191 (2015) 159--177	1410.3012
31	R. Frederix and S. Frixione	Merging meets matching in MC@NLO	JHEP 12 (2012) 061	1209.6215
32	N. Kidonakis	Differential and total cross sections for top pair and single top production	arXiv:1205.3453, Kennesaw State University, May, 2012 Comments: 4 pages, 10 figures; presented at XX International Workshop on Deep-Inelastic Scattering and Related Subjects (DIS2012), Bonn, Germany, March 26-30
33	M. Czakon, P. Fiedler, and A. Mitov	Total Top-Quark Pair-Production Cross Section at Hadron Colliders Through O($ \alpha_S^4 $)	PRL 110 (2013) 252004	1303.6254
34	CMS Collaboration	Measurements of the $ \mathrm{pp}\to\mathrm{WZ} $ inclusive and differential production cross section and constraints on charged anomalous triple gauge couplings at $ \sqrt{s} = $ 13 TeV.	CMS-PAS-SMP-18-002	CMS-PAS-SMP-18-002
35	CMS Collaboration	Measurement of the WW cross section pp collisions at sqrt(s)=13 TeV	CMS-PAS-SMP-16-006	CMS-PAS-SMP-16-006
36	CMS Collaboration	Measurement of the ZZ production cross section and Z $ \to \ell^+\ell^-\ell'^+\ell'^- $ branching fraction in pp collisions at $ \sqrt s = $ 13 TeV	PLB 763 (2016) 280	CMS-SMP-16-001 1607.08834
37	J. M. Campbell and R. K. Ellis	MCFM for the Tevatron and the LHC	NPPS 205 (2010) 10	1007.3492
38	NNPDF Collaboration	Parton distributions for the LHC Run II	JHEP 04 (2015) 040	1410.8849
39	CMS Collaboration	Event generator tunes obtained from underlying event and multiparton scattering measurements	EPJC 76 (2016) 155	CMS-GEN-14-001 1512.00815
40	GEANT4 Collaboration	GEANT4---a simulation toolkit	NIMA 506 (2003) 250
41	M. Cacciari, G. P. Salam, and G. Soyez	The anti-$ k_t $ jet clustering algorithm	JHEP 04 (2008) 063	0802.1189
42	M. Cacciari, G. P. Salam, and G. Soyez	FastJet user manual	EPJC 72 (2012) 1896	1111.6097
43	CMS Collaboration	Particle-flow reconstruction and global event description with the cms detector	JINST 12 (2017) P10003	CMS-PRF-14-001 1706.04965
44	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
45	CMS Collaboration	Performance of electron reconstruction and selection with the CMS detector in proton-proton collisions at $ \sqrt{s} = $ 8 TeV	JINST 10 (2015) P06005	CMS-EGM-13-001 1502.02701
46	M. Cacciari, G. P. Salam, and G. Soyez	FastJet User Manual	EPJC 72 (2012) 1896	1111.6097
47	M. Cacciari and G. P. Salam	Dispelling the $ N^{3} $ myth for the $ k_t $ jet-finder	PLB 641 (2006) 57	hep-ph/0512210
48	CMS Collaboration	Identification of b quark jets at the CMS Experiment in the LHC Run 2	CMS-PAS-BTV-15-001	CMS-PAS-BTV-15-001
49	CMS Collaboration	Particle-Flow Event Reconstruction in CMS and Performance for Jets, Taus, and MET	CDS
50	CMS Collaboration	Search for resonant and nonresonant Higgs boson pair production in the $ bb\ell\nu\ell\nu $ final state in proton-proton collisions at sqrt(s) = 13 TeV	JHEP (01, 2018) 054	CMS-HIG-15-002 1606.02266
51	A. Hocker et al.	TMVA - Toolkit for Multivariate Data Analysis	PoS ACAT (2007) 040	physics/0703039
52	J. H. Friedman	Greedy function approximation: A gradient boosting machine.	Ann. Statist. 29 (10, 2001) 1189
53	G. Zech	Upper Limits in Experiments with Background Or Measurement Errors	NIMA 277 (1989) 608
54	CMS Collaboration	CMS Luminosity Measurements for the 2016 Data Taking Period	CMS-PAS-LUM-17-001	CMS-PAS-LUM-17-001
55	M. Botje et al.	The PDF4LHC Working Group Interim Recommendations		1101.0538
56	S. Alekhin et al.	The PDF4LHC Working Group Interim Report		1101.0536
57	T. Junk	Confidence level computation for combining searches with small statistics	Nucl.Instrum.Meth. A 434 (1999) 435	hep-ex/9902006
58	A. L. Read	Presentation of search results: the CLs technique	JPG: Nucl. Part. Phys. 28 (2002)
59	CMS Collaboration	SM Higgs Combination	CDS