Compact Muon Solenoid
LHC, CERN
Visit us: CMS Public Website, CMS Physics ;
Contact us: CMS Publications Committee
| CMS-SMP-13-012 ; CERN-EP-2016-093 | ||
| Measurement of electroweak production of a W boson and two forward jets in proton-proton collisions at $ \sqrt{s} = $ 8 TeV | ||
| CMS Collaboration | ||
| 23 July 2016 | ||
| JHEP 11 (2016) 147 | ||
| Abstract: A measurement is presented of the cross section for the electroweak production of a W boson in association with two jets in proton-proton collisions at a center-of-mass energy of 8 TeV. The data set was collected with the CMS detector and corresponds to an integrated luminosity of 19.3 fb$^{-1}$. The measured fiducial cross section for W bosons decaying to electrons or muons and for $p_{\mathrm{T}}^{\mathrm{j1}} > $ 60 GeV, $p_{\mathrm{T}}^{\mathrm{j2}} > $ 50 GeV, $|{\eta^{\mathrm{j}}} | < $ 4.7, and ${m_{\mathrm{jj}}} > $ 1000 GeV is 0.42 $\pm$ 0.04 (stat) $\pm$ 0.09 (syst) $\pm$ 0.01 (lumi) pb. This result is consistent with the standard model leading-order prediction of 0.50 $\pm$ 0.02 (scale) $\pm$ 0.02 (PDF) pb obtained with MADGRAPH5-aMC@NLO 2.1 interfaced to PYTHIA 6.4. This is the first cross section measurement for this process. | ||
| Links: e-print arXiv:1607.06975 [hep-ex] (PDF) ; CDS record ; inSPIRE record ; HepData record ; CADI line (restricted) ; | ||
| Figures | |
png pdf |
Figure 1:
Representative diagrams for EW $\ell \nu \mathrm {jj}$ productions at the LHC: (a) bremsstrahlung, (b) VBF, and (c) multiperipheral processes. |
png pdf |
Figure 1-a:
Representative diagrams for EW $\ell \nu \mathrm {jj}$ productions at the LHC: (a) bremsstrahlung, (b) VBF, and (c) multiperipheral processes. |
png pdf |
Figure 1-b:
Representative diagrams for EW $\ell \nu \mathrm {jj}$ productions at the LHC: (a) bremsstrahlung, (b) VBF, and (c) multiperipheral processes. |
png pdf |
Figure 1-c:
Representative diagrams for EW $\ell \nu \mathrm {jj}$ productions at the LHC: (a) bremsstrahlung, (b) VBF, and (c) multiperipheral processes. |
png pdf |
Figure 2:
Comparison of the distributions of BDT discriminant output between data and simulation for the electron (a) and muon (b) channels with $ {m_{\mathrm {jj}}} > $ 1000 GeV. |
png pdf |
Figure 2-a:
Comparison of the distributions of BDT discriminant output between data and simulation for the electron (a) and muon (b) channels with $ {m_{\mathrm {jj}}} > $ 1000 GeV. |
png pdf |
Figure 2-b:
Comparison of the distributions of BDT discriminant output between data and simulation for the electron (a) and muon (b) channels with $ {m_{\mathrm {jj}}} > $ 1000 GeV. |
png pdf |
Figure 3:
Comparison of the distributions of the leading jet ${p_{\mathrm {T}}}$ between data and simulation for the electron (a) and muon (b) channels with $ {m_{\mathrm {jj}}} > $ 1000 GeV. |
png pdf |
Figure 3-a:
Comparison of the distributions of the leading jet ${p_{\mathrm {T}}}$ between data and simulation for the electron (a) and muon (b) channels with $ {m_{\mathrm {jj}}} > $ 1000 GeV. |
png pdf |
Figure 3-b:
Comparison of the distributions of the leading jet ${p_{\mathrm {T}}}$ between data and simulation for the electron (a) and muon (b) channels with $ {m_{\mathrm {jj}}} > $ 1000 GeV. |
png pdf |
Figure 4:
Comparison of the distributions of $\Delta \eta $ between the two leading jets between data and simulation for the electron (a) and muon (b) channels with $ {m_{\mathrm {jj}}} > $ 1000 GeV. |
png pdf |
Figure 4-a:
Comparison of the distributions of $\Delta \eta $ between the two leading jets between data and simulation for the electron (a) and muon (b) channels with $ {m_{\mathrm {jj}}} > $ 1000 GeV. |
png pdf |
Figure 4-b:
Comparison of the distributions of $\Delta \eta $ between the two leading jets between data and simulation for the electron (a) and muon (b) channels with $ {m_{\mathrm {jj}}} > $ 1000 GeV. |
png pdf |
Figure 5 :
Distribution of the two-jet invariant mass ${m_{\mathrm {jj}}}$ for electron (a,b,c) and muon (d,e,f) channels. Fitted projections of signal and background processes are plotted as shaded regions (a,d). The ${m_{\mathrm {jj}}} $ distributions are shown after subtraction of all components except the EW $\mathrm{ W } $+2-jets process (b,e). Finally, the $(\text {data} - \text {fit})/\text {uncertainty}$ distributions are shown (c,f). Here the error bars represent the statistical uncertainties of the data. |
png pdf |
Figure 5 -a:
Distribution of the two-jet invariant mass ${m_{\mathrm {jj}}}$ for electron (a,b,c) and muon (d,e,f) channels. Fitted projections of signal and background processes are plotted as shaded regions (a,d). The ${m_{\mathrm {jj}}} $ distributions are shown after subtraction of all components except the EW $\mathrm{ W } $+2-jets process (b,e). Finally, the $(\text {data} - \text {fit})/\text {uncertainty}$ distributions are shown (c,f). Here the error bars represent the statistical uncertainties of the data. |
png pdf |
Figure 5 -b:
Distribution of the two-jet invariant mass ${m_{\mathrm {jj}}}$ for electron (a,b,c) and muon (d,e,f) channels. Fitted projections of signal and background processes are plotted as shaded regions (a,d). The ${m_{\mathrm {jj}}} $ distributions are shown after subtraction of all components except the EW $\mathrm{ W } $+2-jets process (b,e). Finally, the $(\text {data} - \text {fit})/\text {uncertainty}$ distributions are shown (c,f). Here the error bars represent the statistical uncertainties of the data. |
png pdf |
Figure 5 -c:
Distribution of the two-jet invariant mass ${m_{\mathrm {jj}}}$ for electron (a,b,c) and muon (d,e,f) channels. Fitted projections of signal and background processes are plotted as shaded regions (a,d). The ${m_{\mathrm {jj}}} $ distributions are shown after subtraction of all components except the EW $\mathrm{ W } $+2-jets process (b,e). Finally, the $(\text {data} - \text {fit})/\text {uncertainty}$ distributions are shown (c,f). Here the error bars represent the statistical uncertainties of the data. |
png pdf |
Figure 5 -d:
Distribution of the two-jet invariant mass ${m_{\mathrm {jj}}}$ for electron (a,b,c) and muon (d,e,f) channels. Fitted projections of signal and background processes are plotted as shaded regions (a,d). The ${m_{\mathrm {jj}}} $ distributions are shown after subtraction of all components except the EW $\mathrm{ W } $+2-jets process (b,e). Finally, the $(\text {data} - \text {fit})/\text {uncertainty}$ distributions are shown (c,f). Here the error bars represent the statistical uncertainties of the data. |
png pdf |
Figure 5 -e:
Distribution of the two-jet invariant mass ${m_{\mathrm {jj}}}$ for electron (a,b,c) and muon (d,e,f) channels. Fitted projections of signal and background processes are plotted as shaded regions (a,d). The ${m_{\mathrm {jj}}} $ distributions are shown after subtraction of all components except the EW $\mathrm{ W } $+2-jets process (b,e). Finally, the $(\text {data} - \text {fit})/\text {uncertainty}$ distributions are shown (c,f). Here the error bars represent the statistical uncertainties of the data. |
png pdf |
Figure 5 -f:
Distribution of the two-jet invariant mass ${m_{\mathrm {jj}}}$ for electron (a,b,c) and muon (d,e,f) channels. Fitted projections of signal and background processes are plotted as shaded regions (a,d). The ${m_{\mathrm {jj}}} $ distributions are shown after subtraction of all components except the EW $\mathrm{ W } $+2-jets process (b,e). Finally, the $(\text {data} - \text {fit})/\text {uncertainty}$ distributions are shown (c,f). Here the error bars represent the statistical uncertainties of the data. |
| Tables | |
png pdf |
Table 1:
Summary of selection criteria. |
png pdf |
Table 2:
The expected event yields and the ratio of the measured and expected yields extracted from the maximum-likelihood fit to data. |
png pdf |
Table 3:
Sources of systematic uncertainties and the magnitude of their effect on the fiducial cross section. |
png pdf |
Table 4:
The measured values for the EW $\mathrm{ W } (\to \ell \nu )$+2-jets fiducial cross section. |
| Summary |
| A measurement has been performed of the cross section for the electroweak production of W bosons produced in association with two forward jets in proton-proton collisions. The W bosons were identified through their decay to electrons and muons. The data set was collected by the CMS experiment and corresponds to an integrated luminosity of 19.2 (19.3) $\pm$ 0.5 fb$^{-1}$ in the electron (muon) channel at $ \sqrt{s} = $ 8 TeV. The measured value of the fiducial electroweak W+2-jets cross section, for W bosons decaying to electrons or muons and for $p_{\mathrm{T}}^{\mathrm{j1}} > $ 60 GeV, $p_{\mathrm{T}}^{\mathrm{j2}} > $ 50 GeV, $|{\eta^{\mathrm{j}}} | < $ 4.7, and ${m_{\mathrm{jj}}} > $ 1000 GeV, is 0.42 $\pm$ 0.04 (stat) $\pm$ 0.09 (syst) $\pm$ 0.01 (lumi) pb, consistent with the SM LO prediction of 0.50 $\pm$ 0.02 (scale) $\pm$ 0.02 (PDF) obtained via MADGRAPH5-aMC@NLO 2.1 interfaced with PYTHIA 6.4. This is the first measurement of the cross section for electroweak W+2-jets production. |
| References | ||||
| 1 | D. L. Rainwater, R. Szalapski, and D. Zeppenfeld | Probing color singlet exchange in Z + 2 jet events at the CERN LHC | PRD 54 (1996) 6680 | hep-ph/9605444 |
| 2 | V. A. Khoze, M. G. Ryskin, W. J. Stirling, and P. H. Williams | A Z monitor to calibrate Higgs production via vector boson fusion with rapidity gaps at the LHC | EPJC 26 (2003) 429 | hep-ph/0207365 |
| 3 | CMS Collaboration | Measurement of the hadronic activity in events with a Z and two jets and extraction of the cross section for the electroweak production of a Z with two jets in pp collisions at $ \sqrt{s} = $ 7 TeV | JHEP 13 (2013) 062 | CMS-FSQ-12-019 1305.7389 |
| 4 | U. Baur and D. Zeppenfeld | Measuring three vector boson couplings in $ \mathrm{ q }\mathrm{ q } \to \mathrm{ q }\mathrm{ q }\mathrm{ W } $ at the SSC | hep-ph/9309227 | |
| 5 | O. J. P. Eboli and M. C. Gonzalez-Garcia | Probing trilinear gauge boson interactions via single electroweak gauge boson production at the CERN LHC | PRD 70 (2004) 074011 | hep-ph/0405269 |
| 6 | D. L. Rainwater, D. Zeppenfeld, and K. Hagiwara | Searching for $ \mathrm{ H } \to \tau^+\tau^- $ in weak boson fusion at the CERN LHC | PRD 59 (1998) 014037 | hep-ph/9808468 |
| 7 | T. Plehn, D. L. Rainwater, and D. Zeppenfeld | A Method for identifying $ \mathrm{ H } \to \tau^+\tau^- \to \mathrm{ e }^\pm \mu^\mpE_{\mathrm{T}}^{\text{miss}} $ at the CERN LHC | PRD 61 (2000) 093005 | hep-ph/9911385 |
| 8 | D. L. Rainwater and D. Zeppenfeld | Observing $ \mathrm{ H } \to \mathrm{ W }^*\mathrm{ W }^* \to \mathrm{ e }^\pm\mu^\mpE_{\mathrm{T}}^{\text{miss}} $ in weak boson fusion with dual forward jet tagging at the CERN LHC | PRD 60 (1999) 113004 | hep-ph/9906218 |
| 9 | N. Kauer, T. Plehn, D. L. Rainwater, and D. Zeppenfeld | $ \mathrm{ H } \to \mathrm{ W }^+\mathrm{ W }^- $ as the discovery mode for a light Higgs boson | PLB 503 (2001) 113 | hep-ph/0012351 |
| 10 | CMS Collaboration | Measurement of electroweak production of two jets in association with a Z boson in proton-proton collisions at $ \sqrt{s} = $ 8 TeV | EPJC 75 (2015) 66 | CMS-FSQ-12-035 1410.3153 |
| 11 | ATLAS Collaboration | Measurement of the electroweak production of dijets in association with a Z boson and distributions sensitive to vector boson fusion in proton-proton collisions at $ \sqrt{s} = $ 8 TeV using the ATLAS detector | JHEP 04 (2014) 031 | 1401.7610 |
| 12 | ATLAS Collaboration | Evidence for electroweak production of $ \mathrm{ W }^{\pm}\mathrm{ W }^{\pm}\mathrm{jj} $ in pp collisions at $ \sqrt{s} = $ 8 TeV with the ATLAS detector | PRL 113 (2014) 141803 | 1405.6241 |
| 13 | CMS Collaboration | Study of vector boson scattering and search for new physics in events with two same-sign leptons and two jets | PRL 114 (2015) 051801 | CMS-SMP-13-015 1410.6315 |
| 14 | CMS Collaboration | The CMS experiment at the CERN LHC | JINST 3 (2008) S08004 | CMS-00-001 |
| 15 | CMS Collaboration | Description and performance of track and primary-vertex reconstruction with the CMS tracker | JINST 9 (2014) P10009 | CMS-TRK-11-001 1405.6569 |
| 16 | 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 |
| 17 | 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 |
| 18 | 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 |
| 19 | J. Alwall et al. | MadGraph 5: going beyond | JHEP 06 (2011) 128 | 1106.0522 |
| 20 | P. Nason | A new method for combining NLO QCD with shower Monte Carlo algorithms | JHEP 11 (2004) 040 | hep-ph/0409146 |
| 21 | S. Frixione, P. Nason, and C. Oleari | Matching NLO QCD computations with Parton Shower simulations: the POWHEG method | JHEP 11 (2007) 070 | 0709.2092 |
| 22 | 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 |
| 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 | E. Re | Single-top $ Wt $-channel production matched with parton showers using the POWHEG method | EPJC 71 (2011) 1547 | 1009.2450 |
| 25 | T. Sjostrand, S. Mrenna, and P. Z. Skands | PYTHIA 6.4 physics and manual | JHEP 05 (2006) 026 | hep-ph/0603175 |
| 26 | J. Pumplin et al. | New generation of parton distributions with uncertainties from global QCD analysis | JHEP 07 (2002) 012 | hep-ph/0201195 |
| 27 | CMS Collaboration | Measurement of the underlying event activity at the LHC with $ \sqrt{s} = $ 7 TeV and comparison with $ \sqrt{s} = $ 0.9 TeV | JHEP 11 (09) 109 | CMS-QCD-10-010 1107.0330 |
| 28 | CMS Collaboration | Study of the underlying event at forward rapidity in pp collisions at $ \sqrt{s} = $ 0.9, 2.76, and 7 TeV | JHEP 04 (2013) 072 | CMS-FWD-11-003 1302.2394 |
| 29 | S. Jadach, J. H. Kuhn, and Z. W\cas | TAUOLA --- a library of monte carlo programs to simulate decays of polarized tau leptons | CPC 64 (1991) 275 | |
| 30 | M. Bahr et al. | Herwig++ physics and manual | EPJC 58 (2008) 639 | 0803.0883 |
| 31 | S. Hoeche et al. | Matching parton showers and matrix elements | in HERA and the LHC: A Workshop on the implications of HERA for LHC physics: Proceedings Part A 2006 | hep-ph/0602031 |
| 32 | Particle Data Group, K. A. Olive et al. | Review of Particle Physics | CPC 38 (2014) 090001 | |
| 33 | S. Frixione and B. R. Webber | Matching NLO QCD computations and parton shower simulations | JHEP 06 (2002) 029 | hep-ph/0204244 |
| 34 | S. Frixione, P. Nason, and B. R. Webber | Matching NLO QCD and parton showers in heavy flavor production | JHEP 08 (2003) 007 | hep-ph/0305252 |
| 35 | H.-L. Lai et al. | New parton distributions for collider physics | PRD 82 (2010) 074024 | 1007.2241 |
| 36 | G. Corcella et al. | HERWIG 6: an event generator for hadron emission reactions with interfering gluons (including supersymmetric processes) | JHEP 01 (2001) 010 | hep-ph/0011363 |
| 37 | G. Corcella et al. | HERWIG 6.5 release note | hep-ph/0210213 | |
| 38 | K. Melnikov and F. Petriello | Electroweak gauge boson production at hadron colliders through $ \mathcal{O}(\alpha_S^2) $ | PRD 74 (2006) 114017 | hep-ph/0609070 |
| 39 | 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 |
| 40 | M. Aliev et al. | HATHOR: HAdronic Top and Heavy quarks crOss section calculatoR | CPC 182 (2011) 1034 | 1007.1327 |
| 41 | P. Kant et al. | HATHOR for single top-quark production: updated predictions and uncertainty estimates for single top-quark production in hadronic collisions | CPC 191 (2015) 74 | 1406.4403 |
| 42 | J. M. Campbell and R. K. Ellis | Mcfm for the tevatron and the lhc | NPPS 205--206 (2010) 10 | 1007.3492 |
| 43 | GEANT4 Collaboration | GEANT4 --- a simulation toolkit | NIMA 506 (2003) 250 | |
| 44 | CMS Collaboration | Measurement of the inclusive W and Z production cross sections in pp collisions at $ \sqrt{s} = $ 7 TeV | JHEP 10 (2011) 132 | CMS-EWK-10-005 1107.4789 |
| 45 | CMS Collaboration | Particle--flow event reconstruction in CMS and performance for jets, taus, and $ E_{\mathrm{T}}^{\text{miss}} $ | CMS-PAS-PFT-09-001 | |
| 46 | CMS Collaboration | Commissioning of the particle--flow event reconstruction with the first LHC collisions recorded in the CMS detector | CMS-PAS-PFT-10-001 | |
| 47 | M. Cacciari, G. P. Salam, and G. Soyez | The anti-$ k_{\mathrm{t}} $ jet clustering algorithm | JHEP 04 (2008) 063 | 0802.1189 |
| 48 | M. Cacciari, G. P. Salam, and G. Soyez | FastJet user manual | EPJC 72 (2012) 1896 | 1111.6097 |
| 49 | M. Cacciari, G. P. Salam, and G. Soyez | The catchment area of jets | JHEP 04 (2008) 005 | 0802.1188 |
| 50 | CMS Collaboration | Pileup jet identification | CMS-PAS-JME-13-005 | CMS-PAS-JME-13-005 |
| 51 | CMS Collaboration | Measurements of differential jet cross sections in proton-proton collisions at $ \sqrt{s} = $ 7 TeV with the CMS detector | PRD 87 (2013) 112002 | CMS-QCD-11-004 1212.6660 |
| 52 | M. Cacciari and G. P. Salam | Pileup subtraction using jet areas | PLB 659 (2008) 119 | 0707.1378 |
| 53 | CMS Collaboration | Determination of jet energy calibration and transverse momentum resolution in CMS | JINST 6 (2011) P11002 | CMS-JME-10-011 1107.4277 |
| 54 | CMS Collaboration | Performance of the CMS missing transverse momentum reconstruction in pp data at $ \sqrt{s} = $ 8 TeV | JINST 10 (2015) P02006 | CMS-JME-13-003 1411.0511 |
| 55 | H. Voss, A. Hocker, J. Stelzer, and F. Tegenfeldt | TMVA, the toolkit for multivariate data analysis with ROOT | physics/0703039 | |
| 56 | Y. Freund and R. E. Schapire | A decision-theoretic generalization of on-line learning and an application to boosting | J. Comput. Syst. Sci. 55 (1997) 119 | |
| 57 | J. M. Campbell, R. K. Ellis, and D. L. Rainwater | Next-to-leading order QCD predictions for W+2-jet and Z+2-jet production at the CERN LHC | PRD 68 (2003) 094021 | hep-ph/0308195 |
| 58 | CMS Collaboration | Search for invisible decays of Higgs bosons in the vector boson fusion and associated $ \mathrm{ Z } \mathrm{ H } $ production modes | EPJC 74 (2014) 2980 | CMS-HIG-13-030 1404.1344 |
| 59 | A. Ken et al. | VBFNLO: a parton level Monte Carlo for processes with electroweak bosons | CPC 180 (2009) 1661 | 0811.4559 |
| 60 | CMS Collaboration | Cms luminosity based on pixel cluster counting --- summer 2013 update | CMS-PAS-LUM-13-001 | CMS-PAS-LUM-13-001 |
| 61 | L. Lyons, D. Gibaut, and P. Clifford | How to combine correlated estimates of a single physical quantity | NIMA 270 (1988) 110 | |
| 62 | A. Valassi | Combining correlated measurements of several different physical quantities | NIMA 500 (2003) 391 | |
|
|
Compact Muon Solenoid LHC, CERN |
|
|
|
|
|
|