CMS logoCMS event Hgg
Compact Muon Solenoid
LHC, CERN

CMS-PAS-B2G-16-021
Search for massive resonances decaying into WW, WZ, ZZ, qW and qZ in the dijet final state at $\sqrt{s} = $ 13 TeV using 2016 data
Abstract: A search for new massive resonances decaying to pairs of W and Z bosons or to a W/Z boson and a quark in the dijet final state is presented. Results are based on data corresponding to an integrated luminosity of 12.9 fb$^{-1}$ recorded in proton-proton collisions at $\sqrt{s} = $ 13 TeV with the CMS detector at the CERN LHC in 2016. Resonances with masses of at least 1.1 TeV and decaying to WW, WZ, ZZ, qW, or qZ are probed. Cross section and resonance mass exclusion limits are set for various models that predict gravitons, heavy spin-1 bosons and excited quarks. In a heavy vector triplet model ("B"), W' and Z' resonances with masses below 2.7 and 2.6 TeV, respectively, are excluded at a confidence level of 95%. Similarly, excited quark resonances, q*, decaying to qW and qZ with masses less than 5.0 and 3.9 TeV, respectively, are excluded. In the narrow-width bulk graviton model, cross section upper limits in the range 2-80 fb are set.
Figures & Tables Summary References CMS Publications
Figures

png pdf
Figure 1:
Final $ {m_\mathrm {jj}} $ distributions for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data. On the left, the HP, and on the right, the LP categories are shown for the WW, WZ, and ZZ categories from top to bottom. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 1-a:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the HP, WW category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 1-b:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the LP, WW category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 1-c:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the HP, WZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 1-d:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the LP, WZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 1-e:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the HP, ZZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 1-f:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the LP, ZZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 2:
Final $ {m_\mathrm {jj}} $ distributions for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data. On the left, the HP, and on the right, the LP categories are shown for the qW and qZ categories from top to bottom. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 2-a:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the HP, qW category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 2-b:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the LP, qW category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 2-c:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the HP, qZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 2-d:
Final $ {m_\mathrm {jj}} $ distribution for the dijet analysis in the signal regions using 12.9 fb$^{-1}$ of 13 TeV data, for the LP, qZ category. The solid curve represents a background-only fit to the data distribution where the filled red area corresponds to the 1sigma statistical error of the fit. The data are shown as black markers.

png pdf
Figure 3:
Dijet invariant mass distribution for different signal mass hypotheses used to extract the signal shape.

png pdf
Figure 4:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of a narrow-width resonance decaying to a pair of vector bosons for different signal hypotheses. Limits are set in the context of a spin-1 neutral Z' (left) and charged W' (right) resonances, and compared with the prediction of the HVT model B. On the bottom, limits are set in the context of a bulk graviton decaying into WW (left) and ZZ (right) with $ {\tilde{k}}=$ 0.5 and compared with the model prediction. Signal cross section uncertainties are displayed as a red checked band.

png pdf
Figure 4-a:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of a narrow-width resonance decaying to a pair of vector bosons in the context of a spin-1 neutral Z' resonance, and compared with the prediction of the HVT model B. Signal cross section uncertainties are displayed as a red checked band.

png pdf
Figure 4-b:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of a narrow-width resonance decaying to a pair of vector bosons in the context of a spin-1 charged W' resonance, and compared with the prediction of the HVT model B. Signal cross section uncertainties are displayed as a red checked band.

png pdf
Figure 4-c:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of a narrow-width resonance decaying to a pair of vector bosons in the context of a bulk graviton decaying into WW with $ {\tilde{k}}=$ 0.5 and compared with the model prediction. Signal cross section uncertainties are displayed as a red checked band.

png pdf
Figure 4-d:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of a narrow-width resonance decaying to a pair of vector bosons in the context of a bulk graviton decaying into ZZ with $ {\tilde{k}}=$ 0.5 and compared with the model prediction. Signal cross section uncertainties are displayed as a red checked band.

png pdf
Figure 5:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of an excited quark resonance decaying into qW (left) or qZ (right). Signal cross section uncertainties are displayed as a red checked band.

png pdf
Figure 5-a:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of an excited quark resonance decaying into qW. Signal cross section uncertainties are displayed as a red checked band.

png pdf
Figure 5-b:
Observed (black solid) and expected (black dashed) 95% CL upper limits on the production of an excited quark resonance decaying into qZ. Signal cross section uncertainties are displayed as a red checked band.
Tables

png pdf
Table 1:
Data-to-simulation scale factors for the efficiency of the $ {\tau _{21}} $ selection used in this analysis, as extracted from a top-quark enriched data sample and from simulation.

png pdf
Table 2:
W jet mass peak position and resolution, as extracted from a top enriched data sample and from simulation. These are used to derive corrections of the soft drop jet mass.

png pdf
Table 3:
Summary of the signal systematic uncertainties for the analysis and their impact on the event yield in the signal region and on the reconstructed $ {m_{ {\mathrm {V}} {\mathrm {V}} }} $ shape (mean and width). The last three uncertainties result in migrations between event categories, but do not affect the overall signal efficiency.
Summary
We have presented a search for new resonances decaying to WW, ZZ, WZ, qW or qZ in which the bosons decay hadronically. W and Z bosons that decay to quarks are identified by requiring a jet with mass compatible with the W or Z mass, respectively. Additional information from jet substructure is used to reduce the background from QCD multijet processes. No evidence for a signal is found, and the result is interpreted as an upper limit on the production cross section as a function of the resonance mass in the context of the bulk graviton, and HVT model B W' and Z' models as well as in the context of an excited quark resonances q*. For the HVT model B, we exclude W' and Z' resonances with masses below 2.7 and 2.6 TeV, respectively. In the narrow-width bulk graviton model, cross sections are excluded in the range 2-80 fb. Exclusion limits are set at a confidence level of 95% on the production of excited quark resonances q* decaying to qW and qZ for masses less than 5.0 and 3.9 TeV, respectively. This search sets the most stringent mass limits on a q* resonance in the qW and qZ decay mode and a Z' resonance in the WW decay mode. It also provides the most stringent cross section limits on narrow-width graviton resonances with masses above 1.1 TeV in the WW and ZZ decay mode.
References
1 K. Agashe, H. Davoudiasl, G. Perez, and A. Soni Warped Gravitons at the LHC and Beyond PRD76 (2007) hep-ph/0701186
2 A. L. Fitzpatrick, J. Kaplan, L. Randall, and L.-T. Wang Searching for the Kaluza-Klein Graviton in Bulk RS Models JHEP 09 (2007) hep-ph/0701150
3 O. Antipin, D. Atwood, and A. Soni Search for RS gravitons via W(L)W(L) decays PLB666 (2008) 0711.3175
4 L. Randall and R. Sundrum A Large mass hierarchy from a small extra dimension PRL 83 (1999) hep-ph/9905221
5 L. Randall and R. Sundrum An Alternative to compactification PRL 83 (1999) hep-th/9906064
6 D. Pappadopulo, A. Thamm, R. Torre, and A. Wulzer Heavy Vector Triplets: Bridging Theory and Data JHEP 09 (2014) 1402.4431
7 B. Bellazzini, C. Cs\'aki, and J. Serra Composite Higgses EPJC 74 (2014) 2766 1401.2457
8 R. Contino, D. Marzocca, D. Pappadopulo, and R. Rattazzi On the effect of resonances in composite Higgs phenomenology JHEP 10 (2011) 1109.1570
9 D. Marzocca, M. Serone, and J. Shu General composite Higgs models JHEP 08 (2012) 1205.0770
10 D. Greco and D. Liu Hunting composite vector resonances at the LHC: naturalness facing data JHEP 12 (2014) 126 1410.2883
11 M. Schmaltz and D. Tucker-Smith Little Higgs review Ann. Rev. Nucl. Part. Sci. 55 (2005) 229 hep-ph/0502182
12 N. Arkani-Hamed, A. Cohen, E. Katz, and A. Nelson The Littlest Higgs JHEP 07 (2002) 034 hep-ph/0206021
13 G. Altarelli, B. Mele, and M. Ruiz-Altaba Searching for new heavy vector bosons in $ p\bar{p} $ colliders Zeitschrift fur Physik C Particles and Fields 45 (1989) 109
14 ATLAS Collaboration Search for new resonances decaying to a $ W $ or $ Z $ boson and a Higgs boson in the $ \ell^+ \ell^- b\bar b $, $ \ell \nu b\bar b $, and $ \nu\bar{\nu} b\bar b $ channels with pp collisions at $ \sqrt s = $ 13 TeV with the ATLAS detector 1607.05621
15 ATLAS Collaboration Searches for heavy diboson resonances in pp collisions at $ \sqrt{s}=$ 13 TeV with the ATLAS detector 1606.04833
16 CMS Collaboration Search for new resonances decaying via WZ to leptons in proton-proton collisions at $ \sqrt{s} = $ 8 TeV PLB 740 (2015) CMS-EXO-12-025
1407.3476
17 CMS Collaboration Search for massive resonances decaying into pairs of boosted bosons in semi-leptonic final states at $ \sqrt{s} = $ 8 TeV JHEP 08 (2014) CMS-EXO-13-009
1405.3447
18 CMS Collaboration Search for massive resonances in dijet systems containing jets tagged as W or Z boson decays in pp collisions at $ \sqrt{s} = $ 8 TeV JHEP 08 (2014) CMS-EXO-12-024
1405.1994
19 CMS Collaboration Search for massive WH resonances decaying into the $ \ell \nu \mathrm{b} \overline{\mathrm{b}} $ final state at $ \sqrt{s} = $ 8 TeV EPJC 76 (2016) CMS-EXO-14-010
1601.06431
20 CMS Collaboration Search for a massive resonance decaying into a Higgs boson and a W or Z boson in hadronic final states in proton-proton collisions at $ \sqrt{s} = $ 8 TeV JHEP 02 (2016) CMS-EXO-14-009
1506.01443
21 CMS Collaboration Search for Narrow High-Mass Resonances in Proton-Proton Collisions at $ \sqrt{s} = $ 8 TeV Decaying to a Z and a Higgs Boson PLB 748 (2015) CMS-EXO-13-007
1502.04994
22 ATLAS Collaboration Search for high-mass diboson resonances with boson-tagged jets in proton-proton collisions at $ \sqrt{s} = $ 8 TeV with the ATLAS detector JHEP 12 (2015) 1506.00962
23 ATLAS Collaboration Search for production of $ WW/WZ $ resonances decaying to a lepton, neutrino and jets in pp collisions at $ \sqrt{s} = $ 8 TeV with the ATLAS detector EPJC75 (2015), no. 5, , [Erratum: Eur. Phys. J.C75,370(2015)] 1503.04677
24 ATLAS Collaboration Search for WZ resonances in the fully leptonic channel using pp collisions at $ \sqrt{s} = $ 8 TeV with the ATLAS detector PLB 737 (2014) 1406.4456
25 ATLAS Collaboration Search for a new resonance decaying to a W or Z boson and a Higgs boson in the $ \ell \ell / \ell \nu / \nu \nu + b \bar{b} $ final states with the ATLAS detector EPJC 75 (2015) 1503.08089
26 CMS Collaboration Search for massive resonances decaying into pairs of boosted W and Z bosons at $ \sqrt{s} = $ 13 TeV CMS-PAS-EXO-15-002 CMS-PAS-EXO-15-002
27 F. Dias et al. Combination of Run-1 Exotic Searches in Diboson Final States at the LHC JHEP 04 (2016) 1512.03371
28 U. Baur, I. Hinchliffe, and D. Zeppenfeld Excited Quark Production at Hadron Colliders Int. J. Mod. Phys. A2 (1987)
29 U. Baur, M. Spira, and P. M. Zerwas Excited-quark and -lepton production at hadron colliders PRD 42 (Aug, 1990)
30 CMS Collaboration Search for narrow resonances using the dijet mass spectrum in pp collisions at $ \sqrt{s} = $ 8 TeV PRD 87 (Jun, 2013)
31 ATLAS Collaboration ATLAS search for new phenomena in dijet mass and angular distributions using pp collisions at $ \sqrt{s} = $ 7 TeV Journal of High Energy Physics 2013 (2013), no. 1
32 R. M. Harris and K. Kousouris Searches for Dijet Resonances at Hadron Colliders Int. J. Mod. Phys. A26 (2011) 1110.5302
33 ATLAS Collaboration Search for new phenomena in photon+jet events collected in proton--proton collisions at $ \sqrt{s} = $ 8 TeV with the ATLAS detector PLB728 (2014) 1309.3230
34 CMS Collaboration Search for heavy resonances in the W/Z-tagged dijet mass spectrum in pp collisions at 7 TeV PLB723 (2013) CMS-EXO-11-095
1212.1910
35 CMS Collaboration Search for anomalous production of highly boosted $ Z $ bosons decaying to $ \mu^+ \mu^- $ in proton-proton collisions at $ \sqrt{s} = $ 7 TeV PLB722 (2013) CMS-EXO-11-025
1210.0867
36 CMS Collaboration The CMS experiment at the CERN LHC JINST 3 (2008) CMS-00-001
37 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) 1405.0301
38 T. Sjostrand, S. Mrenna, and P. Z. Skands PYTHIA 6.4 Physics and Manual JHEP 05 (2006) hep-ph/0603175
39 T. Sjostrand, S. Mrenna, and P. Z. Skands A Brief Introduction to PYTHIA 8.1 CPC 178 (2008) 0710.3820
40 R. D. Ball et al. Impact of Heavy Quark Masses on Parton Distributions and LHC Phenomenology Nucl. Phys. B849 (2011) 1101.1300
41 GEANT4 Collaboration GEANT4: A Simulation toolkit NIMA506 (2003)
42 CMS Collaboration CMS Luminosity Measurement for the 2015 Data Taking Period CMS-PAS-LUM-15-001 CMS-PAS-LUM-15-001
43 CMS Collaboration Tracking and Primary Vertex Results in First 7 TeV Collisions CDS
44 CMS Collaboration Particle-Flow Event Reconstruction in CMS and Performance for Jets, Taus, and MET CDS
45 CMS Collaboration Commissioning of the Particle-flow Event Reconstruction with the first LHC collisions recorded in the CMS detector CDS
46 M. Cacciari, G. P. Salam, and G. Soyez FastJet User Manual EPJC72 (2012) 1111.6097
47 M. Cacciari, G. P. Salam, and G. Soyez The Anti-k(t) jet clustering algorithm JHEP 04 (2008) 0802.1189
48 CMS Collaboration Determination of Jet Energy Calibration and Transverse Momentum Resolution in CMS JINST 6 (2011) CMS-JME-10-011
1107.4277
49 D. Bertolini, P. Harris, M. Low, and N. Tran Pileup per particle identification Journal of High Energy Physics 2014 (2014), no. 10
50 CMS Collaboration W-tagging performance in 13 TeV simulation CDS
51 CMS Collaboration Identification techniques for highly boosted W bosons that decay into hadrons JHEP 12 (2014) CMS-JME-13-006
1410.4227
52 CMS Collaboration Studies of jet mass in dijet and W/Z + jet events JHEP 05 (2013) CMS-SMP-12-019
1303.4811
53 M. Dasgupta, A. Fregoso, S. Marzani, and G. P. Salam Towards an understanding of jet substructure JHEP 1309 (2013) 029 1307.0007
54 M. Dasgupta, A. Fregoso, S. Marzani, and A. Powling Jet substructure with analytical methods Eur.Phys.J. C73 (2013), no. 11 1307.0013
55 A. J. Larkoski, S. Marzani, G. Soyez, and J. Thaler Soft Drop JHEP 05 (2014) 1402.2657
56 S. D. Ellis, C. K. Vermilion, and J. R. Walsh Techniques for improved heavy particle searches with jet substructure PRD80 (2009) 0903.5081
57 S. D. Ellis, C. K. Vermilion, and J. R. Walsh Recombination Algorithms and Jet Substructure: Pruning as a Tool for Heavy Particle Searches PRD81 (2010) 0912.0033
58 D. Krohn, J. Thaler, and L.-T. Wang Jet Trimming JHEP 02 (2010) 0912.1342
59 S. Catani, Y. L. Dokshitzer, M. H. Seymour, and B. R. Webber Longitudinally invariant $ K_t $ clustering algorithms for hadron hadron collisions Nucl. Phys. B406 (1993)
60 S. D. Ellis and D. E. Soper Successive combination jet algorithm for hadron collisions PRD48 (1993) hep-ph/9305266
61 M. Wobisch and T. Wengler Hadronization corrections to jet cross-sections in deep inelastic scattering in Monte Carlo generators for HERA physics. Proceedings, Workshop, Hamburg, Germany, 1998-1999 1998 hep-ph/9907280
62 J. Thaler and K. Van Tilburg Identifying Boosted Objects with N-subjettiness JHEP 03 (2011) 1011.2268
63 M. Bahr et al. Herwig++ Physics and Manual EPJC 58 (2008) 0803.0883
64 M. J. Oreglia PhD thesis, Stanford University, 1980 SLAC Report SLAC-R-236
65 M. Cacciari et al. The $ \mathrm{ t \bar{t} } $ cross-section at 1.8-TeV and 1.96-TeV: A Study of the systematics due to parton densities and scale dependence JHEP 04 (2004) 068 hep-ph/0303085
66 S. Catani, D. de Florian, M. Grazzini, and P. Nason Soft gluon resummation for Higgs boson production at hadron colliders JHEP 07 (2003) 028 hep-ph/0306211
67 A. L. Read Presentation of search results: The CL(s) technique JPG28 (2002)
68 T. Junk Confidence level computation for combining searches with small statistics NIMA434 (1999) hep-ex/9902006
Compact Muon Solenoid
LHC, CERN