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| CMS-PAS-TOP-15-015 | ||
| Measurement of the jet mass distribution in boosted $\mathrm{t}\bar{\mathrm{t}}$ production at $\sqrt{s}= $ 8 TeV | ||
| CMS Collaboration | ||
| September 2016 | ||
| Abstract: A first measurement is performed of the differential $\mathrm{t}\bar{\mathrm{t}}$ production cross section as a function of the leading jet mass in fully-merged top quark decays. Data collected with the CMS detector in pp collisions at $\sqrt{s}= $ 8 TeV are used, corresponding to an integrated luminosity of 19.7 fb$^{-1}$. The measurement is carried out in the $\ell$+jets channel, where the products of the leptonic decay are used to select $\mathrm{t}\bar{\mathrm{t}}$ events with high Lorentz boosts. The products of the hadronic decay are reconstructed with a single Cambridge/Aachen jet with distance parameter $R= $ 1.2, and transverse momentum $p_{\mathrm{T}}> $ 400 GeV. The cross section, as a function of the jet mass $m_{\rm{jet}}$, is unfolded and reported on particle level. The measurement is used to test the modelling of boosted top quark production. The peak position of the $m_{\rm{jet}}$ distribution is sensitive to the top quark mass $m_\text{t}$ and the data are used to extract a value of $m_\text{t}$ to assess the measurement's sensitivity. | ||
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Links:
CDS record (PDF) ;
inSPIRE record ;
CADI line (restricted) ;
These preliminary results are superseded in this paper, EPJC 77 (2017) 467. The superseded preliminary plots can be found here. |
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| Figures | |
png pdf |
Figure 1:
Simulated jet mass distribution of the leading jet in the $\ell $+jets channel on particle level. The events were simulated with POWHEG+PYTHIA and are normalized to an integrated luminosity of 19.7 fb$^{-1}$. The total number of selected events (total, black solid line) is compared to events where the leading jet originates from the hadronic top quark decay (fully-merged, blue solid line) and events where the leading jet does not include all particles from the hadronic top quark decay (unmerged, orange dotted line). |
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Figure 2:
Distributions of $ {p_{\mathrm {T}}} $ (left) and $\eta $ (right) of the leading CA12 jet in data and simulation. The combination of the electron and muon channels is shown. The ${\mathrm{ t } {}\mathrm{ \bar{t} } } $ sample is scaled such that the number of events in simulation matches the number of events observed in data. The uncertainty band includes statistical and experimental systematic uncertainties, where the statistical (light grey) and total (dark grey) uncertainties are shown separately in the ratio. |
png pdf |
Figure 2-a:
Distributions of $ {p_{\mathrm {T}}} $ of the leading CA12 jet in data and simulation. The combination of the electron and muon channels is shown. The ${\mathrm{ t } {}\mathrm{ \bar{t} } } $ sample is scaled such that the number of events in simulation matches the number of events observed in data. The uncertainty band includes statistical and experimental systematic uncertainties, where the statistical (light grey) and total (dark grey) uncertainties are shown separately in the ratio. |
png pdf |
Figure 2-b:
Distributions of $\eta $ of the leading CA12 jet in data and simulation. The combination of the electron and muon channels is shown. The ${\mathrm{ t } {}\mathrm{ \bar{t} } } $ sample is scaled such that the number of events in simulation matches the number of events observed in data. The uncertainty band includes statistical and experimental systematic uncertainties, where the statistical (light grey) and total (dark grey) uncertainties are shown separately in the ratio. |
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Figure 3:
Distribution of the invariant mass of the leading CA12 jet in data and simulation. The combination of the electron and muon channels is shown. The distributions are shown for two different $ {p_{\mathrm {T}}} $ bins for 400 $ < {p_{\mathrm {T}}} < $ 500 GeV (left) and $ {p_{\mathrm {T}}} > $ 500 GeV (right). The ${\mathrm{ t } {}\mathrm{ \bar{t} } } $ sample is scaled such that the number of events in simulation matches the number of events observed in data. The uncertainty band includes statistical and experimental systematic uncertainties, where the statistical (light grey) and total (dark grey) uncertainties are shown separately in the ratio. |
png pdf |
Figure 3-a:
Distribution of the invariant mass of the leading CA12 jet in data and simulation. The combination of the electron and muon channels is shown. The distributions are shown for two different $ {p_{\mathrm {T}}} $ bins for 400 $ < {p_{\mathrm {T}}} < $ 500 GeV. The ${\mathrm{ t } {}\mathrm{ \bar{t} } } $ sample is scaled such that the number of events in simulation matches the number of events observed in data. The uncertainty band includes statistical and experimental systematic uncertainties, where the statistical (light grey) and total (dark grey) uncertainties are shown separately in the ratio. |
png pdf |
Figure 3-b:
Distribution of the invariant mass of the leading CA12 jet in data and simulation. The combination of the electron and muon channels is shown. The distributions are shown for two different $ {p_{\mathrm {T}}} $ bins for $ {p_{\mathrm {T}}} > $ 500 GeV. The ${\mathrm{ t } {}\mathrm{ \bar{t} } } $ sample is scaled such that the number of events in simulation matches the number of events observed in data. The uncertainty band includes statistical and experimental systematic uncertainties, where the statistical (light grey) and total (dark grey) uncertainties are shown separately in the ratio. |
png pdf |
Figure 4:
Statistical uncertainties compared to individual experimental systematic uncertainties (left) and statistical uncertainties compared to uncertainties originating from the modelling of ${\mathrm{ t } {}\mathrm{ \bar{t} } }$ production (right) for the differential cross section measurement. The respective total uncertainty is shown as cross-hatched regions. The statistical and total uncertainties in the last bin are around 340% and exceed the vertical scale. The size of the horizontal bars represents the bin widths. |
png pdf |
Figure 4-a:
Statistical uncertainties compared to individual experimental systematic uncertainties for the differential cross section measurement. The respective total uncertainty is shown as cross-hatched regions. The statistical and total uncertainties in the last bin are around 340% and exceed the vertical scale. The size of the horizontal bars represents the bin widths. |
png pdf |
Figure 4-b:
Statistical uncertainties compared to uncertainties originating from the modelling of ${\mathrm{ t } {}\mathrm{ \bar{t} } }$ production for the differential cross section measurement. The respective total uncertainty is shown as cross-hatched regions. The statistical and total uncertainties in the last bin are around 340% and exceed the vertical scale. The size of the horizontal bars represents the bin widths. |
png pdf |
Figure 5:
Fiducial particle-level differential ${\mathrm{ t } {}\mathrm{ \bar{t} } }$ production cross section as a function of the leading jet mass. The combined cross sections obtained from the electron and muon channels are compared to the predictions from MadGraph+PYTHIA, POWHEG+PYTHIA and MC@NLO+HERWIG. The data are shown with statistical (inner bars) and total (outer bars) uncertainties. |
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Figure 6:
Normalised particle-level differential ${\mathrm{ t } {}\mathrm{ \bar{t} } }$ production cross section in the fiducial region as a function of the leading jet mass. The measurement is compared to predictions from MadGraph+PYTHIA using three different values of ${m_{\text {t}}}$. The data are shown with statistical (inner bars) and total (outer bars) uncertainties. |
| Tables | |
png pdf |
Table 1:
Summary of the selection defining the fiducial measurement region. |
| Summary |
| A first measurement of the differential $\mathrm{ t \bar{t} }$ cross section as a function of the leading jet mass ${m_{\text{jet}}}$ in the boosted regime has been performed. The measurement is carried out in a fiducial region with fully-merged hadronic top quark decays and is corrected to the particle level. The shape of the ${m_{\text{jet}}}$ distribution agrees with predictions from simulations, showing the overall good modelling of the jet mass for top quarks. The total cross section for ${m_{\text{jet}}} $ between 140-350 GeV is 103.5 $\pm$ 18.2 fb, which is 20-30% lower than predicted due to the softer top quark $p_{\mathrm{T}}$ spectrum observed in data than in simulation [7,8]. The peak position of the ${m_{\text{jet}}}$ distribution exhibits sensitivity to the top quark mass ${m_{\text{t}}} $. This can be used for an independent determination of ${m_{\text{t}}}$ in the boosted regime, with the prospect of a more reliable resemblance between the pole-mass (or ${m_{\text{t}}}$ in any well-defined renormalisation scheme) and the top quark mass parameter ${m_{\text{t}}} $ in full-scale event generators. The normalised particle-level measurement of ${m_{\text{jet}}}$ is used to extract a value of ${m_{\text{t}}}$ to estimate the current sensitivity of the data. The value obtained, ${m_{\text{t}}} =$ 171.8 $\pm$ 9.5 GeV is consistent with the current LHC+Tevatron average, 173.34 $\pm$ 0.27 (stat) $\pm$ 0.71 (syst) GeV [99], albeit with a much larger uncertainty. New data at higher centre-of-mass energies with higher integrated luminosities will lead to an improvement in the statistical uncertainty. Larger statistics can also lead to improvements on the experimental systematic uncertainties, most notably on the jet mass scale, which is expected to improve with smaller jet distance parameters. Additionally, improvements on the modelling uncertainty are expected due to better constraints of the simulation in the boosted regime. A reduction of the theory uncertainty is foreseeable with the availability of higher order calculations. |
| References | ||||
| 1 | CMS Collaboration | Measurement of differential top-quark pair production cross sections in pp colisions at $ \sqrt{s}= $ 7 TeV | EPJC 73 (2013) 2339 | CMS-TOP-11-013 1211.2220 |
| 2 | ATLAS Collaboration | Measurements of normalized differential cross sections for $ t\bar{t} $ production in pp collisions at $ \sqrt{s}= $ 7 TeV using the ATLAS detector | PRD 90 (2014) 072004 | 1407.0371 |
| 3 | ATLAS Collaboration | Differential top-antitop cross-section measurements as a function of observables constructed from final-state particles using pp collisions at $ \sqrt{s}= $ 7 TeV in the ATLAS detector | JHEP 06 (2015) 100 | 1502.05923 |
| 4 | CMS Collaboration | Measurement of the differential cross section for top quark pair production in pp collisions at $ \sqrt{s}= $ 8 TeV | EPJC 75 (2015) 542 | CMS-TOP-12-028 1505.04480 |
| 5 | CMS Collaboration | Measurement of the $ \mathrm{t}\overline{{\mathrm{t}}} $ production cross section in the all-jets final state in pp collisions at $ \sqrt{s}= $ 8 TeV | EPJC 76 (2016) 128 | CMS-TOP-14-018 1509.06076 |
| 6 | ATLAS Collaboration | Measurement of top quark pair differential cross-sections in the dilepton channel in pp collisions at $ \sqrt{s} = $ 7 and 8 TeV with ATLAS | 1607.07281 | |
| 7 | ATLAS Collaboration | Measurement of the differential cross-section of highly boosted top quarks as a function of their transverse momentum in $ \sqrt{s}= $ 8 TeV proton-proton collisions using the ATLAS detector | PRD 93 (2016) 032009 | 1510.03818 |
| 8 | CMS Collaboration | Measurement of the integrated and differential t-tbar production cross sections for high-pt top quarks in pp collisions at $ \sqrt{s}= $ 8 TeV | Submitted to: PRD. (2016) | CMS-TOP-14-012 1605.00116 |
| 9 | CMS Collaboration | Search for anomalous $ \mathrm{ t \bar{t} } $ production in the highly-boosted all-hadronic final state | JHEP 1209 (2012) 029 | CMS-EXO-11-006 1204.2488 |
| 10 | ATLAS Collaboration | A search for $ \mathrm{ t \bar{t} } $ resonances in lepton+jets events with highly boosted top quarks collected in pp collisions at $ \sqrt{s}= $ 7 TeV with the ATLAS detector | JHEP 1209 (2012) 041 | 1207.2409 |
| 11 | ATLAS Collaboration | Search for resonances decaying into top-quark pairs using fully hadronic decays in pp collisions with ATLAS at $ \sqrt{s}= $ 7 TeV | JHEP 01 (2013) 116 | 1211.2202 |
| 12 | ATLAS Collaboration | Search for $ t\bar t $ resonances in the lepton plus jets final state with ATLAS using 4.7 fb$ ^{-1} $ of pp collisions at $ \sqrt{s}= $ 7 TeV | PRD 88 (2013) 012004 | 1305.2756 |
| 13 | CMS Collaboration | Searches for new physics using the $ t\bar{t} $ invariant mass distribution in pp collisions at $ \sqrt{s}= $ 8 TeV | PRL 111 (2013) 211804, , [Erratum ibid. 112 (2014) 119903 \DOI10.1103/PhysRevLett.112.119903] | CMS-B2G-13-001 1309.2030 |
| 14 | ATLAS Collaboration | Search for $ W' \rightarrow tb \rightarrow qqbb $ decays in pp collisions at $ \sqrt{s}= $ 8 TeV with the ATLAS detector | EPJC 75 (2015) 165 | 1408.0886 |
| 15 | CMS Collaboration | Search for vector-like T quarks decaying to top quarks and Higgs bosons in the all-hadronic channel using jet substructure | JHEP 06 (2015) 080 | CMS-B2G-14-002 1503.01952 |
| 16 | ATLAS Collaboration | A search for $ t\overline{t} $ resonances using lepton-plus-jets events in proton-proton collisions at $ \sqrt{s}= $ 8 TeV with the ATLAS detector | JHEP 08 (2015) 148 | 1505.07018 |
| 17 | CMS Collaboration | Search for resonant $ t\bar{t} $ production in proton-proton collisions at $ \sqrt{s}= $ 8 TeV | PRD 93 (2016) 012001 | CMS-B2G-13-008 1506.03062 |
| 18 | CMS Collaboration | Search for the production of an excited bottom quark decaying to $ tW $ in proton-proton collisions at $ \sqrt{s}= $ 8 TeV | JHEP 01 (2016) 166 | CMS-B2G-14-005 1509.08141 |
| 19 | ATLAS Collaboration | Search for the production of single vector-like and excited quarks in the $ Wt $ final state in pp collisions at $ \sqrt{s}= $ 8 TeV with the ATLAS detector | JHEP 02 (2016) 110 | 1510.02664 |
| 20 | ATLAS Collaboration | Jet mass and substructure of inclusive jets in $ \sqrt{s}= $ 7 TeV pp collisions with the ATLAS experiment | JHEP 05 (2012) 128 | 1203.4606 |
| 21 | CMS Collaboration | Studies of jet mass in dijet and W/Z + jet events | JHEP 05 (2013) 090 | CMS-SMP-12-019 1303.4811 |
| 22 | A. H. Hoang and I. W. Stewart | Top Mass Measurements from Jets and the Tevatron Top-Quark Mass | NPPS 185 (2008) 220 | 0808.0222 |
| 23 | ATLAS Collaboration | Measurement of the top quark mass in the $ t\bar{t}\rightarrow \text{ lepton+jets } $ and $ t\bar{t}\rightarrow \text{ dilepton } $ channels using $ \sqrt{s}=7 $ $ {\mathrm { TeV}} $ ATLAS data | EPJC 75 (2015) 330 | 1503.05427 |
| 24 | ATLAS Collaboration | Determination of the top-quark pole mass using $ t\overline{t} $ + 1-jet events collected with the ATLAS experiment in 7 TeV pp collisions | JHEP 10 (2015) 121 | 1507.01769 |
| 25 | CMS Collaboration | Measurement of the top quark mass using proton-proton data at $ \sqrt{s} = $ 7 and 8 TeV | PRD 93 (2016) 072004 | CMS-TOP-14-022 1509.04044 |
| 26 | CMS Collaboration | Measurement of the top quark mass using charged particles in pp collisions at $ \sqrt s = $ 8 TeV | PRD 93 (2016) 092006 | CMS-TOP-12-030 1603.06536 |
| 27 | ATLAS Collaboration | Measurement of the top quark mass in the $ t\bar{t}\to $ dilepton channel from $ \sqrt{s}= $ 8 TeV ATLAS data | PLB 761 (2016) 350 | 1606.02179 |
| 28 | C. W. Bauer, S. Fleming, and M. E. Luke | Summing Sudakov logarithms in $ B \to X_s + \gamma $ in effective field theory | PRD 63 (2000) 014006 | hep-ph/0005275 |
| 29 | C. W. Bauer, S. Fleming, D. Pirjol, and I. W. Stewart | An Effective field theory for collinear and soft gluons: Heavy to light decays | PRD 63 (2001) 114020 | hep-ph/0011336 |
| 30 | C. W. Bauer and I. W. Stewart | Invariant operators in collinear effective theory | PLB 516 (2001) 134 | hep-ph/0107001 |
| 31 | C. W. Bauer, D. Pirjol, and I. W. Stewart | Soft collinear factorization in effective field theory | PRD 65 (2002) 054022 | hep-ph/0109045 |
| 32 | S. Fleming, A. H. Hoang, S. Mantry, and I. W. Stewart | Jets from massive unstable particles: Top-mass determination | PRD 77 (2008) 074010 | hep-ph/0703207 |
| 33 | S. Fleming, A. H. Hoang, S. Mantry, and I. W. Stewart | Top Jets in the Peak Region: Factorization Analysis with NLL Resummation | PRD 77 (2008) 114003 | 0711.2079 |
| 34 | A. H. Hoang, A. Pathak, P. Pietrulewicz, and I. W. Stewart | Hard Matching for Boosted Tops at Two Loops | JHEP 12 (2015) 059 | 1508.04137 |
| 35 | S. Moch et al. | High precision fundamental constants at the TeV scale | 1405.4781 | |
| 36 | A. H. Hoang | The Top Mass: Interpretation and Theoretical Uncertainties | in 7th International Workshop on Top Quark Physics (TOP2014) Cannes, France, September 28-October 3, 2014 2014 | 1412.3649 |
| 37 | G. Corcella | Interpretation of the top-quark mass measurements: a theory overview | PoS TOP2015 (2016) 037 | 1511.08429 |
| 38 | M. Butenschoen et al. | Top Quark Mass Calibration for Monte Carlo Event Generators | 1608.01318 | |
| 39 | Y. L. Dokshitzer, G. D. Leder, S. Moretti, and B. R. Webber | Better jet clustering algorithms | JHEP 08 (1997) 001 | hep-ph/9707323 |
| 40 | 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, p. 270 1998 | hep-ph/9907280 |
| 41 | CMS Collaboration | Particle--Flow Event Reconstruction in CMS and Performance for Jets, Taus, and $ E_{\mathrm{T}}^{\text{miss}} $ | CDS | |
| 42 | CMS Collaboration | Commissioning of the Particle-flow Event Reconstruction with the first LHC collisions recorded in the CMS detector | CDS | |
| 43 | 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 |
| 44 | 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 |
| 45 | CMS Collaboration | Energy Calibration and Resolution of the CMS Electromagnetic Calorimeter in pp Collisions at $ \sqrt{s}= $ 7 TeV | JINST 8 (2013) P09009 | CMS-EGM-11-001 1306.2016 |
| 46 | 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 |
| 47 | M. Cacciari, G. P. Salam, and G. Soyez | FastJet user manual | EPJC 72 (2012) 1896 | 1111.6097 |
| 48 | M. Cacciari, G. P. Salam, and G. Soyez | The anti-$ k_t $ jet clustering algorithm | JHEP 04 (2008) 063 | 0802.1189 |
| 49 | M. Cacciari, G. P. Salam, and G. Soyez | The catchment area of jets | JHEP 04 (2008) 005 | 0802.1188 |
| 50 | CMS Collaboration | Determination of jet energy calibration and transverse momentum resolution in CMS | JINST 6 (2011) P11002 | CMS-JME-10-011 1107.4277 |
| 51 | CMS Collaboration | Identification of b-quark jets with the CMS experiment | JINST 8 (2013) P04013 | CMS-BTV-12-001 1211.4462 |
| 52 | CMS Collaboration | Jet Performance in pp Collisions at 7 TeV | CDS | |
| 53 | CMS Collaboration | Missing transverse energy performance of the CMS detector | JINST 6 (2011) P09001 | CMS-JME-10-009 1106.5048 |
| 54 | P. Nason | A New method for combining NLO QCD with shower Monte Carlo algorithms | JHEP 11 (2004) 040 | hep-ph/0409146 |
| 55 | S. Frixione, P. Nason, and C. Oleari | Matching NLO QCD computations with parton shower simulations: the POWHEG method | JHEP 11 (2007) 070 | 0709.2092 |
| 56 | 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 |
| 57 | J. Alwall et al. | MadGraph 5: going beyond | JHEP 06 (2011) 128 | 1106.0522 |
| 58 | P. Artoisenet, R. Frederix, O. Mattelaer, and R. Rietkerk | Automatic spin-entangled decays of heavy resonances in Monte Carlo simulations | JHEP 03 (2013) 015 | 1212.3460 |
| 59 | T. Sj\"ostrand, S. Mrenna, and P. Skands | PYTHIA 6.4 physics and manual | JHEP 05 (2006) 026 | hep-ph/0603175 |
| 60 | 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, , [Erratum: JHEP02,011(2010)] | 0907.4076 |
| 61 | E. Re | Single-top Wt-channel production matched with parton showers using the POWHEG method | EPJC 71 (2011) 1547 | 1009.2450 |
| 62 | S. Frixione and B. R. Webber | Matching NLO QCD computations and parton shower simulations | JHEP 06 (2002) 029 | hep-ph/0204244 |
| 63 | M. L. Mangano, M. Moretti, F. Piccinini, and M. Treccani | Matching matrix elements and shower evolution for top-quark production in hadronic collisions | JHEP 01 (2007) 013 | hep-ph/0611129 |
| 64 | P. M. Nadolsky et al. | Implications of CTEQ global analysis for collider observables | PRD 78 (2008) 013004 | 0802.0007 |
| 65 | H.-L. Lai et al. | New parton distributions for collider physics | PRD 82 (2010) 074024 | 1007.2241 |
| 66 | J. Pumplin et al. | New generation of parton distributions with uncertainties from global QCD analysis | JHEP 07 (2002) 012 | hep-ph/0201195 |
| 67 | 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 |
| 68 | CMS Collaboration | Event generator tunes obtained from underlying event and multiparton scattering measurements | EPJC 76 (2016) 155 | CMS-GEN-14-001 1512.00815 |
| 69 | 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 |
| 70 | N. Kidonakis | NNLL threshold resummation for top-pair and single-top production | Phys. Part. Nucl. 45 (2014) 714 | 1210.7813 |
| 71 | R. Gavin, Y. Li, F. Petriello, and S. Quackenbush | FEWZ 2.0: A code for hadronic Z production at next-to-next-to-leading order | CPC 182 (2011) 2388 | 1011.3540 |
| 72 | R. Gavin, Y. Li, F. Petriello, and S. Quackenbush | W Physics at the LHC with FEWZ 2.1 | CPC 184 (2013) 208 | 1201.5896 |
| 73 | Y. Li and F. Petriello | Combining QCD and electroweak corrections to dilepton production in FEWZ | PRD 86 (2012) 094034 | 1208.5967 |
| 74 | J. M. Campbell, R. K. Ellis, and K. Williams | Vector boson pair production at the LHC | JHEP 07 (2011) 018 | 1105.0020 |
| 75 | M. Beneke, P. Falgari, S. Klein, and C. Schwinn | Hadronic top-quark pair production with NNLL threshold resummation | Nucl. Phys. B 855 (2012) 695 | 1109.1536 |
| 76 | M. Cacciari et al. | Top-pair production at hadron colliders with next-to-next-to-leading logarithmic soft-gluon resummation | PLB 710 (2012) 612--622 | 1111.5869 |
| 77 | P. B\"arnreuther, M. Czakon, and A. Mitov | Percent Level Precision Physics at the Tevatron: First Genuine NNLO QCD Corrections to $ q \bar{q} \to t \bar{t} + X $ | PRL 109 (2012) 132001 | 1204.5201 |
| 78 | M. Czakon and A. Mitov | NNLO corrections to top-pair production at hadron colliders: the all-fermionic scattering channels | JHEP 12 (2012) 054 | 1207.0236 |
| 79 | M. Czakon and A. Mitov | NNLO corrections to top pair production at hadron colliders: the quark-gluon reaction | JHEP 01 (2013) 080 | 1210.6832 |
| 80 | M. Czakon, P. Fiedler, and A. Mitov | Total Top-Quark Pair-Production Cross Section at Hadron Colliders Through $ O(α\frac{4}{S}) $ | PRL 110 (2013) 252004 | 1303.6254 |
| 81 | 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 |
| 82 | GEANT4 Collaboration | GEANT4---a simulation toolkit | NIMA 506 (2003) 250 | |
| 83 | 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 |
| 84 | CMS Collaboration | Jet energy scale and resolution in the CMS experiment in pp collisions at 8 TeV | Submitted to: JINST (2016) | CMS-JME-13-004 1607.03663 |
| 85 | J. Thaler and K. Van Tilburg | Identifying boosted objects with $ N $-subjettiness | JHEP 03 (2011) 015 | 1011.2268 |
| 86 | J. Thaler and K. Van Tilburg | Maximizing boosted top identification by minimizing $ N $-subjettiness | JHEP 02 (2012) 093 | 1108.2701 |
| 87 | D. E. Kaplan, K. Rehermann, M. D. Schwartz, and B. Tweedie | Top Tagging: A Method for Identifying Boosted Hadronically Decaying Top Quarks | PRL 101 (2008) 142001 | 0806.0848 |
| 88 | CMS Collaboration | A Cambridge-Aachen (C-A) Based Jet Algorithm For Boosted Top-Jet Tagging | CDS | |
| 89 | T. Plehn, G. P. Salam, and M. Spannowsky | Fat Jets for a Light Higgs | PRL 104 (2010) 111801 | 0910.5472 |
| 90 | T. Plehn, M. Spannowsky, M. Takeuchi, and D. Zerwas | Stop Reconstruction with Tagged Tops | JHEP 1010 (2010) 078 | 1006.2833 |
| 91 | T. Lapsien, R. Kogler, and J. Haller | A new tagger for hadronically decaying heavy particles at the LHC | 1606.04961 | |
| 92 | S. Schmitt | TUnfold: an algorithm for correcting migration effects in high energy physics | JINST 7 (2012) T10003 | 1205.6201 |
| 93 | CMS Collaboration | Measurement of the production cross section of the W boson in association with two b jets in pp collisions at sqrt(s) = 8 TeV | CMS-SMP-14-020 1608.07561 |
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| 94 | CMS Collaboration | Observation of the associated production of a single top quark and a $ W $ boson in pp collisions at $ \sqrt{s}= $ 8 TeV | PRL 112 (2014) 231802 | CMS-TOP-12-040 1401.2942 |
| 95 | CMS Collaboration | CMS Luminosity Based on Pixel Cluster Counting - Summer 2013 Update | CMS-PAS-LUM-13-001 | CMS-PAS-LUM-13-001 |
| 96 | ATLAS Collaboration | Measurement of the $ t\overline{t} $ production cross-section using $ e\mu $ events with $ b $ -tagged jets in pp collisions at $ \sqrt{s} = $ 7 and 8 TeV with the ATLAS detector | EPJC 74 (2014) 3109 | 1406.5375 |
| 97 | CMS Collaboration | Measurement of the t-tbar production cross section in the e-mu channel in proton-proton collisions at $ \sqrt{s} = $ 7 and 8 TeV | JHEP 08 (2016) 029 | CMS-TOP-13-004 1603.02303 |
| 98 | Gfitter Group Collaboration | The global electroweak fit at NNLO and prospects for the LHC and ILC | EPJC 74 (2014) 3046 | 1407.3792 |
| 99 | ATLAS, CDF, CMS, D0 Collaboration | First combination of Tevatron and LHC measurements of the top-quark mass | 1403.4427 | |
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