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| CMS-PAS-B2G-16-029 | ||
| Search for heavy resonances decaying to pairs of vector bosons in the $\ell \nu q \bar{q}$ final state with the CMS detector in proton-proton collisions at $\sqrt{s} = $ 13 TeV | ||
| CMS Collaboration | ||
| December 2017 | ||
| Abstract: A search for new heavy particles decaying to pairs of vector bosons is presented using data from the CMS detector corresponding to an integrated luminosity of 35.9 fb$^{-1}$ collected at a centre-of-mass energy of $\sqrt{s}= $ 13 TeV in 2016. One W boson is required to decay to e$\nu$ or $\mu\nu$, while the other boson is reconstructed as a single massive jet with substructure compatible with that of a highly-energetic $q \bar{q}^{(')}$ pair from a W or Z boson decay. The search is performed in the resonance mass range between 1.0 and 4.5 TeV. No significant deviations from the background only hypothesis are observed in the range of the search. The result is interpreted as an upper bound on the resonance production cross section. Comparing the excluded cross section values and the expectations from theoretical calculations in the spin-2 bulk graviton and heavy vector triplet models, WW resonances lighter than 1 TeV and WZ resonances lighter than about 3 TeV, respectively, are excluded at 95% confidence level. | ||
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Links:
CDS record (PDF) ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, JHEP 05 (2018) 088. The superseded preliminary plots can be found here. |
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| Figures | |
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Figure 1:
Feynman diagram for the production of a generic resonance decaying to the final state considered in this study. |
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Figure 2:
Jet soft-drop mass (left) and N-subjettiness ratio $ {\tau _{21}}$ (right) for data and simulated events in the top-enriched region in the electron channel. Data statistics only are shown as uncertainties. |
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Figure 2-a:
Jet soft-drop mass for data and simulated events in the top-enriched region in the electron channel. Data statistics only are shown as uncertainties. |
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Figure 2-b:
N-subjettiness ratio $ {\tau _{21}}$ for data and simulated events in the top-enriched region in the electron channel. Data statistics only are shown as uncertainties. |
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Figure 3:
Comparison between the fit result and muon (left) and electron (right) data distributions for $ {m_{\text {jet}}}$ (top) and $ {m_{\mathrm{W} {\mathrm {V}}}} $ (bottom) in the HP category. The background shape uncertainty is shown as a shaded band. No events are observed with $ {m_{\mathrm{W} {\mathrm {V}}}} > $ 4.5 TeV. |
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Figure 3-a:
Comparison between the fit result and the muon data distribution for $ {m_{\text {jet}}}$ in the HP category. The background shape uncertainty is shown as a shaded band. |
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Figure 3-b:
Comparison between the fit result and the electron data distribution for $ {m_{\text {jet}}}$ in the HP category. The background shape uncertainty is shown as a shaded band. |
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Figure 3-c:
Comparison between the fit result and the muon data distribution for $ {m_{\mathrm{W} {\mathrm {V}}}} $ in the HP category. The background shape uncertainty is shown as a shaded band. No events are observed with $ {m_{\mathrm{W} {\mathrm {V}}}} > $ 4.5 TeV. |
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Figure 3-d:
Comparison between the fit result and the electron data distribution for $ {m_{\mathrm{W} {\mathrm {V}}}} $ in the HP category. The background shape uncertainty is shown as a shaded band. No events are observed with $ {m_{\mathrm{W} {\mathrm {V}}}} > $ 4.5 TeV. |
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Figure 4:
Comparison between the fit result and muon (left) and electron (right) data distributions for $ {m_{\text {jet}}}$ (top) and $ {m_{\mathrm{W} {\mathrm {V}}}} $ (bottom) in the LP category. The background shape uncertainty is shown as a shaded band. No events are observed with $ {m_{\mathrm{W} {\mathrm {V}}}} > $ 4.5 TeV. |
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Figure 4-a:
Comparison between the fit result and the muon data distribution for $ {m_{\text {jet}}}$ in the LP category. The background shape uncertainty is shown as a shaded band. |
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Figure 4-b:
Comparison between the fit result and the electron data distribution for $ {m_{\text {jet}}}$ in the LP category. The background shape uncertainty is shown as a shaded band. |
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Figure 4-c:
Comparison between the fit result and the muon data distribution for $ {m_{\mathrm{W} {\mathrm {V}}}} $ in the LP category. The background shape uncertainty is shown as a shaded band. No events are observed with $ {m_{\mathrm{W} {\mathrm {V}}}} > $ 4.5 TeV. |
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Figure 4-d:
Comparison between the fit result and the electron data distribution for $ {m_{\mathrm{W} {\mathrm {V}}}} $ in the LP category. The background shape uncertainty is shown as a shaded band. No events are observed with $ {m_{\mathrm{W} {\mathrm {V}}}} > $ 4.5 TeV. |
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Figure 5:
S/(S+B) event weighted distributions of the resonance mass for the bulk graviton $ \to \mathrm{W} \mathrm{W} $ signal (left) and $\mathrm{W'} \to \mathrm{W} \mathrm{Z} $ signal (right) for the 2D fit (top) and the $\alpha $ method (bottom). The signal is normalized to the production cross section of a graviton or W' of mass 2 TeV as predicted by the bulk graviton and HVT models, respectively, with parameters as defined in Sec. 3. The bottom panel shows the difference between weighted data and background events. |
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Figure 5-a:
S/(S+B) event weighted distribution of the resonance mass for the bulk graviton $ \to \mathrm{W} \mathrm{W} $ for the 2D fit. The signal is normalized to the production cross section of a graviton or W' of mass 2 TeV as predicted by the bulk graviton and HVT models, respectively, with parameters as defined in Sec. 3. The bottom panel shows the difference between weighted data and background events. |
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Figure 5-b:
S/(S+B) event weighted distribution of the resonance mass for the $\mathrm{W'} \to \mathrm{W} \mathrm{Z} $ signal for the 2D fit. The signal is normalized to the production cross section of a graviton or W' of mass 2 TeV as predicted by the bulk graviton and HVT models, respectively, with parameters as defined in Sec. 3. The bottom panel shows the difference between weighted data and background events. |
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Figure 5-c:
S/(S+B) event weighted distribution of the resonance mass for the bulk graviton $ \to \mathrm{W} \mathrm{W} $ for the $\alpha $ method. The signal is normalized to the production cross section of a graviton or W' of mass 2 TeV as predicted by the bulk graviton and HVT models, respectively, with parameters as defined in Sec. 3. The bottom panel shows the difference between weighted data and background events. |
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Figure 5-d:
S/(S+B) event weighted distribution of the resonance mass for the $\mathrm{W'} \to \mathrm{W} \mathrm{Z} $ signal for the $\alpha $ method. The signal is normalized to the production cross section of a graviton or W' of mass 2 TeV as predicted by the bulk graviton and HVT models, respectively, with parameters as defined in Sec. 3. The bottom panel shows the difference between weighted data and background events. |
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Figure 6:
Exclusion limits for a new resonance decaying to WW (left) and limits for a new resonance decaying to WZ (right) as a function of the resonance mass hypothesis. |
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Figure 6-a:
Exclusion limits for a new resonance decaying to WW as a function of the resonance mass hypothesis. |
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Figure 6-b:
Exclusion limits for a new resonance decaying to WZ as a function of the resonance mass hypothesis. |
| Summary |
| A search for new heavy resonances decaying to a pair of vector bosons is performed in events with one electron or muon and a massive jet. Using the N-subjettiness ratio ${\tau_{21}}$, massive jets are tagged as highly-energetic vector bosons (V = W, Z) decaying to quark pairs. The soft-drop mass is used as an estimate of the V-jet mass. The lepton momentum and missing energy are used to reconstruct the momentum of the $\mathrm{W} \to \ell \nu$ boson candidate, constraining the invariant mass of the $\ell \nu$ pair to the W boson mass value. A novel signal extraction technique is introduced based on a simultaneous fit of the V-jet mass and the diboson mass. The result is found to be consistent with the $\alpha$ method employed in previous versions of this analysis. No strong evidence of a new signal is found. The results are interpreted in terms of upper limits on the cross section for new resonances decaying to WW and WZ final states. Comparing the excluded cross section values and the expectation from theoretical calculations, WW resonances lighter than 1 TeV and WZ resonances lighter than about 3 TeV are excluded at 95% confidence level. |
| 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 | S. L. Glashow | Partial Symmetries of Weak Interactions | NP 22 (1961) 579 | |
| 4 | A. Salam and J. C. Ward | Electromagnetic and weak interactions | PL13 (1964) 168 | |
| 5 | S. Weinberg | A Model of Leptons | PRL 19 (1967) 1264 | |
| 6 | G. 't Hooft | Naturalness, chiral symmetry, and spontaneous chiral symmetry breaking | NATO Sci. Ser. B 59 (1980) 135 | |
| 7 | G. F. Giudice | Naturally Speaking: The Naturalness Criterion and Physics at the LHC | 0801.2562 | |
| 8 | L. Randall and R. Sundrum | A Large mass hierarchy from a small extra dimension | PRL 83 (1999) 3370 | hep-ph/9905221 |
| 9 | L. Randall and R. Sundrum | An Alternative to compactification | PRL 83 (1999) 4690 | hep-th/9906064 |
| 10 | K. Agashe, H. Davoudiasl, G. Perez, and A. Soni | Warped Gravitons at the LHC and Beyond | PRD 76 (2007) 036006 | hep-ph/0701186 |
| 11 | 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 |
| 12 | K. Agashe, R. Contino, and A. Pomarol | The Minimal composite Higgs model | NPB 719 (2005) 165 | hep-ph/0412089 |
| 13 | R. Contino, Y. Nomura, and A. Pomarol | Higgs as a Holographic Pseudo-Goldstone boson | NPB 671 (2003) 148 | hep-ph/0306259 |
| 14 | R. Contino, T. Kramer, M. Son, and R. Sundrum | Warped/composite phenomenology simplified | JHEP 05 (2007) 074 | hep-ph/0612180 |
| 15 | K. Lane and L. Pritchett | The light composite Higgs boson in strong extended technicolor | JHEP 06 (2017) 140 | 1604.07085 |
| 16 | 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) 173 | CMS-EXO-12-024 1405.1994 |
| 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) 174 | CMS-EXO-13-009 1405.3447 |
| 18 | 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) 145 | CMS-EXO-14-009 1506.01443 |
| 19 | 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) 255 | CMS-EXO-13-007 1502.04994 |
| 20 | 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), no. 5, 237 | CMS-EXO-14-010 1601.06431 |
| 21 | CMS Collaboration | Search for heavy resonances decaying to two Higgs bosons in final states containing four b quarks | EPJC 76 (2016), no. 7, 371 | CMS-EXO-12-053 1602.08762 |
| 22 | CMS Collaboration | Search for massive resonances decaying into WW, WZ or ZZ bosons in proton-proton collisions at $ \sqrt{s} = $ 13 TeV | JHEP 03 (2017) 162 | CMS-B2G-16-004 1612.09159 |
| 23 | CMS Collaboration | Search for heavy resonances decaying into a vector boson and a Higgs boson in final states with charged leptons, neutrinos, and b quarks | Submitted to: PLB (2016) | CMS-B2G-16-003 1610.08066 |
| 24 | ATLAS Collaboration | Combination of searches for $ WW $, $ WZ $, and $ ZZ $ resonances in $ pp $ collisions at $ \sqrt{s} = $ 8 TeV with the ATLAS detector | PLB 755 (2016) 285 | 1512.05099 |
| 25 | 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) 055 | 1506.00962 |
| 26 | 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), no. 6, 263 | 1503.08089 |
| 27 | 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 | EPJC 75 (2015), no. 5, 209 | 1503.04677 |
| 28 | ATLAS Collaboration | Search for resonant diboson production in the $ \mathrm {\ell \ell}q\bar{q} $ final state in $ pp $ collisions at $ \sqrt{s} = $ 8 TeV with the ATLAS detector | EPJC 75 (2015) 69 | 1409.6190 |
| 29 | 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 | PLB 765 (2017) 32 | 1607.05621 |
| 30 | ATLAS Collaboration | Searches for heavy diboson resonances in $ pp $ collisions at $ \sqrt{s}= $ 13 TeV with the ATLAS detector | JHEP 09 (2016) 173 | 1606.04833 |
| 31 | D. Pappadopulo, A. Thamm, R. Torre, and A. Wulzer | Heavy Vector Triplets: Bridging Theory and Data | JHEP 09 (2014) 060 | 1402.4431 |
| 32 | CMS Collaboration | The CMS experiment at the CERN LHC | JINST 3 (2008) S08004 | CMS-00-001 |
| 33 | B. Bellazzini, C. Cs\'aki, and J. Serra | Composite Higgses | EPJC 74 (2014) 2766 | 1401.2457 |
| 34 | R. Contino, D. Marzocca, D. Pappadopulo, and R. Rattazzi | On the effect of resonances in composite Higgs phenomenology | JHEP 10 (2011) 081 | 1109.1570 |
| 35 | D. Marzocca, M. Serone, and J. Shu | General Composite Higgs Models | JHEP 08 (2012) 013 | 1205.0770 |
| 36 | D. Greco and D. Liu | Hunting composite vector resonances at the LHC: naturalness facing data | JHEP 12 (2014) 126 | 1410.2883 |
| 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) 079 | 1405.0301 |
| 38 | A. Oliveira | Gravity particles from Warped Extra Dimensions, predictions for LHC | 1404.0102 | |
| 39 | Y. Li and F. Petriello | Combining QCD and electroweak corrections to dilepton production in FEWZ | PRD 86 (2012) 094034 | 1208.5967 |
| 40 | 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 |
| 41 | P. Nason | A new method for combining NLO QCD with shower Monte Carlo algorithms | JHEP 11 (2004) 040 | hep-ph/0409146 |
| 42 | S. Frixione, P. Nason, and C. Oleari | Matching NLO QCD computations with Parton Shower simulations: the POWHEG method | JHEP 11 (2007) 070 | 0709.2092 |
| 43 | 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 |
| 44 | 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 |
| 45 | E. Re | Single-top Wt-channel production matched with parton showers using the POWHEG method | EPJC 71 (2011) 1547 | 1009.2450 |
| 46 | S. Alioli, S.-O. Moch, and P. Uwer | Hadronic top-quark pair-production with one jet and parton showering | JHEP 01 (2012) 137 | 1110.5251 |
| 47 | M. Czakon and A. Mitov | Top++: A Program for the Calculation of the Top-Pair Cross-Section at Hadron Colliders | CPC 185 (2014) 2930 | 1112.5675 |
| 48 | R. Frederix and S. Frixione | Merging meets matching in MC@NLO | JHEP 12 (2012) 061 | 1209.6215 |
| 49 | J. M. Campbell, R. K. Ellis, and C. Williams | Vector boson pair production at the LHC | JHEP 07 (2011) 018 | 1105.0020 |
| 50 | J. M. Campbell and R. K. Ellis | Top-quark processes at NLO in production and decay | JPG 42 (2015) 015005 | 1204.1513 |
| 51 | J. M. Campbell, R. K. Ellis, and F. Tramontano | Single top production and decay at next-to-leading order | PRD 70 (2004) 094012 | hep-ph/0408158 |
| 52 | T. Sjostrand, S. Mrenna, and P. Z. Skands | PYTHIA 6.4 Physics and Manual | JHEP 05 (2006) 026 | hep-ph/0603175 |
| 53 | T. Sjostrand, S. Mrenna, and P. Z. Skands | A Brief Introduction to PYTHIA 8.1 | CPC 178 (2008) 852 | 0710.3820 |
| 54 | P. Skands, S. Carrazza, and J. Rojo | Tuning PYTHIA 8.1: the Monash 2013 Tune | EPJC 74 (2014) 3024 | 1404.5630 |
| 55 | CMS Collaboration | Event generator tunes obtained from underlying event and multiparton scattering measurements | EPJC 76 (2016) 155 | CMS-GEN-14-001 1512.00815 |
| 56 | R. D. Ball et al. | Impact of Heavy Quark Masses on Parton Distributions and LHC Phenomenology | NPB 849 (2011) 296 | 1101.1300 |
| 57 | GEANT4 Collaboration | GEANT4: A simulation toolkit | NIMA 506 (2003) 250 | |
| 58 | CMS Collaboration | Measurements of Inclusive W and Z Cross Sections in pp Collisions at $ \sqrt{s}= $ 7 TeV | JHEP 01 (2011) 080 | CMS-EWK-10-002 1012.2466 |
| 59 | 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 |
| 60 | CMS Collaboration | Particle-flow reconstruction and global event description with the CMS detector | JINST 12 (2017) P10003 | CMS-PRF-14-001 1706.04965 |
| 61 | M. Cacciari, G. P. Salam, and G. Soyez | The anti-$ k_t $ jet clustering algorithm | JHEP 04 (2008) 063 | 0802.1189 |
| 62 | M. Cacciari, G. P. Salam, and G. Soyez | FastJet user manual | EPJC 72 (2012) 1896 | 1111.6097 |
| 63 | D. Bertolini, P. Harris, M. Low, and N. Tran | Pileup Per Particle Identification | JHEP 10 (2014) 059 | 1407.6013 |
| 64 | J. Thaler and K. Van Tilburg | Identifying Boosted Objects with N-subjettiness | JHEP 03 (2011) 015 | 1011.2268 |
| 65 | M. Dasgupta, A. Fregoso, S. Marzani, and G. P. Salam | Towards an understanding of jet substructure | JHEP 09 (2013) 029 | 1307.0007 |
| 66 | J. M. Butterworth, A. R. Davison, M. Rubin, and G. P. Salam | Jet substructure as a new Higgs search channel at the LHC | PRL 100 (2008) 242001 | 0802.2470 |
| 67 | A. J. Larkoski, S. Marzani, G. Soyez, and J. Thaler | Soft Drop | JHEP 05 (2014) 146 | 1402.2657 |
| 68 | CMS Collaboration | Identification of b-quark jets with the CMS experiment | JINST 8 (2013) P04013 | CMS-BTV-12-001 1211.4462 |
| 69 | M. Oreglia | PhD thesis, SLAC | ||
| 70 | J. Gaiser | PhD thesis, SLAC | ||
| 71 | CMS Collaboration | CMS luminosity measurements for the 2016 data taking period | CMS-PAS-LUM-17-001 | |
| 72 | S. Baker and R. D. Cousins | Clarification of the Use of Chi Square and Likelihood Functions in Fits to Histograms | NIM221 (1984) 437 | |
| 73 | G. Cowan, K. Cranmer, E. Gross, and O. Vitells | Asymptotic formulae for likelihood-based tests of new physics | EPJC 71 (2011) 1554 | 1007.1727 |
| 74 | A. L. Read | Presentation of search results: The CL(s) technique | JPG 28 (2002) 2693 | |
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Compact Muon Solenoid LHC, CERN |
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