Responsible: ChristianContreras

# Further information

This analysis is documented in CMS-PAS-B2G-13-003. The Table and Figure numbers in the Material in PAS section correspond to the table and figure numbers in the PAS.

## Abstract

A search for pair-production of vector-like partners of the b quark, b', is carried out in events with at least three leptons using 19.5fb$^{-1}$ of of integrated luminosity in pp collisions at $\sqrt{s}$ =8 TeV collected by the CMS experiment at the LHC. The data are binned in multiple exclusive channels according to the amount of expected standard model background in order to increase the search sensitivity. The observations are consistent with the standard model expectations. The search is interpreted for different b' masses and for varying branching ratios to the bZ, tW, and bH states. We exclude b' quarks with masses less than values in the range of 520$-$785 GeV (depending on the values of the branching ratios) at the 95% confidence level.

# Approved tables and plots (click on plot to get larger version)

## Figures

Figure Caption
Figure 1: Background breakdown vs $S_\text{T}$ require 4 Leptons, OSSF2, on-Z, Tau0, 1 b-jet. For b$^\prime$b$^\prime$ $\rightarrow \textrm{bZ}\textrm{bZ}$ as the signal with b$^\prime$ having a mass of 750 GeV.
Figure 2: Background breakdown vs $S_\text{T}$ require 4 Leptons, OSSF2, on-Z, Tau0, 1 b-jet. For b$^\prime$b$^\prime$ $\rightarrow \textrm{tW}\textrm{tW}$ as the signal with b$^\prime$ having a mass of 750 GeV.
Figure 3: Background breakdown vs $S_\text{T}$ require 3 Leptons, OSSF1, above-Z, Tau0, 1 b-jet. For b$^\prime$b$^\prime$ $\rightarrow \textrm{bZ}\textrm{bZ}$ as the signal with b$^\prime$ having a mass of 750 GeV.
Figure 4: Background breakdown vs $S_\text{T}$ require 3 Leptons, OSSF1, above-Z, Tau0, 1 b-jet. For b$^\prime$b$^\prime$ $\rightarrow \textrm{tW}\textrm{tW}$ as the signal with b$^\prime$ having a mass of 750 GeV.
Figure 5: Cross section times branching ratio exclusion curves for a b$^\prime$ as a function of its mass for the decay modes b$^\prime$b$^\prime$ $\rightarrow \textrm{bZ}\textrm{bZ}$. The figure show expected (dashed), observed (solid) exclusions; sigma bands correspond to the experimental uncertainties.
Figure 6: Cross section times branching ratio exclusion curves for a b$^\prime$ as a function of its mass for the decay modes b$^\prime$b$^\prime$ $\rightarrow \textrm{tW}\textrm{tW}$. The figure show expected (dashed), observed (solid) exclusions; sigma bands correspond to the experimental uncertainties.
Figure 7: Cross section times branching ratio exclusion curves for a b$^\prime$ as a function of its mass for the decay modes b$^\prime$b$^\prime$ $\rightarrow \textrm{bH}\textrm{bH}$. The figure show expected (dashed), observed (solid) exclusions; sigma bands correspond to the experimental uncertainties.
Figure 8: Exclusion limits for pair-produced b$^\prime$ quarks going to multileptons in the two-dimensional plane of branching ratio of b$^\prime$ to $\textrm{bZ}$ vs. b$^\prime$ mass. Signal points to the left of the curve are excluded. The y = 0 axis corresponds to b$^\prime$b$^\prime$ $\rightarrow \textrm{tW}\textrm{tW}$ and the $y = 1$ axis to b$^\prime$b$^\prime$ $\rightarrow \textrm{bZ}\textrm{bZ}$. The branching ratio for b$^\prime$ $\rightarrow \textrm{bH}$ is set to zero. We apply a conservative 10% theory uncertainty.
Figure 9: Observed and expected 95% confidence level upper limits for the b$^\prime$ quark production cross section for branching ratio into into $\textrm{tW}$, $\textrm{bH}$, and $\textrm{bZ}$ of 50%, 25%, and 25%, respectively.
Figure 10: Expected exclusion curves as a function of branching ratios. The $\mathcal{B}(\textrm{b'}\rightarrow \textrm{bZ})$ is plotted as a function of the b$^\prime$ mass and the various curves represent fixed $\mathcal{B}(\textrm{b'}\rightarrow \textrm{bH})$ from 0.0 (the rightmost) to 1.0 ( the leftmost)
Figure 11: Observed exclusion curves as a function of branching ratios. The $\mathcal{B}(\textrm{b'}\rightarrow \textrm{bZ})$ is plotted as a function of the b$^\prime$ mass and the various curves represent fixed $\mathcal{B}(\textrm{b'}\rightarrow \textrm{bH})$ from 0.0 (the rightmost) to 1.0 ( the leftmost)
Figure 12: Expected limit results with varied branching ratio of $\textrm{tW}$, $\textrm{bH}$, and $\textrm{bZ}$ in steps of 0.1.
Figure 13: Observed limit results with varied branching ratio of $\textrm{tW}$, $\textrm{bH}$, and $\textrm{bZ}$ in steps of 0.1.

## Tables

Table Caption
Table 1: The systematic uncertainties associated with this analysis.
Table 2: Observed yields for four lepton events from 19.5fb$^{-1}$ recorded in 2012. The channels are broken down by the number of and mass of any opposite-sign same-flavor pairs (whether on or off Z), whether the leptons include taus, whether there are any b jets present and the $S_{\rm T}$. Expected yields are the sum of simulation and data-driven estimates of backgrounds in each channel. The channels are exclusive. Channels marked with an asterisk are used as control regions and are excluded from the limit calculations. Also, those channels with a dagger mark are used in the limit setting procedure and are representative of the top most sensitive channels for the $\textrm{b}^\prime$ decay with mass of 500 GeV where $\mathcal{B}(\textrm{b'}\rightarrow \textrm{bH})=1.0$.
Table 3: Observed yields for three lepton events. The channels are broken down by the number of and mass of any opposite-sign, same-flavor pairs (whether on or off $\textrm{Z}$), whether the leptons include taus, whether there are any b jets present and the $S_{\rm T}$. Expected yields are the sum of simulation and data-driven estimates of backgrounds in each channel. The channels are exclusive. Channels marked with an asterisk are used as control regions and are excluded from the limit calculations. Also, those channels marked with a dagger are a representative subset of the top most sensitive channels for the $\textrm{b}^\prime$ decay, with a mass of 500 GeV and $\mathcal{B}(\textrm{b'}\rightarrow \textrm{bH})=1.0$, which are used in the limit setting procedure.
Table 4: Sets of branching ratio values and the observed and expected 95% CL upper limits for the combined electron and muon channels.

## Additional Material for B2G-13-003

Figure Caption
Figure 1: Background breakdown vs $S_\text{T}$ require 3 Leptons, OSSF1, below-Z, Tau0, 1 b-jet. For b$^\prime$b$^\prime$ $\rightarrow \textrm{bHbH}$ as the signal with b$^\prime$ having a mass of 750 GeV.
Figure 2: Background breakdown vs $S_\text{T}$ require 4 Leptons, OSSF1, on-Z, Tau1, no b-jet. For b$^\prime$b$^\prime$ $\rightarrow \textrm{bHbH}$ as the signal with b$^\prime$ having a mass of 750 GeV.
Figure 3: The isolation distribution of muons with large impact parameter ($\textrm{d$_{xy}$} > 0.02$ cm, primarily from jets) in a data sample enriched in $\textrm{t}\bar{\textrm{t}}$ $\rightarrow l\nu \textrm{bbjj}$.
Figure 4: The isolation distribution of electrons with large impact parameter ($\textrm{d$_{xy}$} > 0.02$ cm, primarily from jets) in a data sample enriched in $\textrm{t}\bar{\textrm{t}}$ $\rightarrow l\nu \textrm{bbjj}$.

## Additional Material from SUS-13-002 and SUS-13-003 (Links to Public Results)

Figure Caption
Figure 1: The $S_\text{T}$ distribution in an opposite sign e$\textrm{$\mu$}$ $\textrm{t}\bar{\textrm{t}}$ control region. The uncertainties in the ratio plot below include both statistical and systematic uncertainties.
Figure 2: Distribution for H$_{\text{T}}$ in the opposite sign e$\textrm{$\mu$}$ dilepton $\textrm{t}\bar{\textrm{t}}$ control region.
Figure 3: Distributions for E$^{miss}_{\text{T}}$ in the opposite sign e$\textrm{$\mu$}$ dilepton $\textrm{t}\bar{\textrm{t}}$ control region.
Figure 4: The transverse mass M$_\text{T}$ distribution of events in a data sample enriched in $\textrm{WZ}$ requiring an OSSF pair with $m(\ell\ell)$ in the Z-window and 50 GeV < E$^{miss}_{\text{T}}$ < 100 GeV.
Figure 5: Distributions for E$^{miss}_{\text{T}}$ in the WZ control region.
Figure 6: 4-lepton mass distribution for low-E$^{miss}_{\text{T}}$, low-H$_{\text{T}}$ ZZ control region.
Figure 7: 3-muon invariant mass showing asymmetric internal photon conversion.
Figure 8: Efficiency ratio vs Rd$_{\textrm{xy}}$ ("b-ness of events") for muons and electrons.
Figure 9: f$_\textrm{t}$-f$_\textrm{sb}$ for taus with p$_{\textrm{T}}$ between 40 and 60 GeV (f$_\textrm{t}$ is the fake-rate for taus and f$_\textrm{sb}$ is inversely proportional to jet activity).
Figure 10: f$_\textrm{t}$-f$_\textrm{sb}$ for taus with p$_{\textrm{T}}$ between 20 and 40 GeV (f$_\textrm{t}$ is the fake-rate for taus and f$_\textrm{sb}$ is inversely proportional to jet activity).
Topic attachments
I Attachment History Action Size Date Who Comment
pdf B2G-3-003_exclusion_bH25pct_reweighted.pdf r1 manage 14.6 K 2013-11-19 - 18:26 ChristianContreras
png B2G-3-003_exclusion_bH25pct_reweighted.png r1 manage 149.2 K 2013-11-19 - 18:27 ChristianContreras
png EffRatvsRdxy_leptons_CMS_Preliminary.png r1 manage 207.5 K 2013-11-20 - 18:24 ChristianContreras
png FTvsFSB_DiLepton_highPt_CMS_Preliminary.png r1 manage 204.0 K 2013-11-20 - 18:24 ChristianContreras
png FTvsFSB_DiLepton_lowPt_CMS_Preliminary.png r1 manage 204.3 K 2013-11-20 - 18:24 ChristianContreras
pdf L3DY1ZVZHTau0b1_bprime750bZbZ_ST.pdf r1 manage 15.4 K 2013-11-20 - 00:30 ChristianContreras
png L3DY1ZVZHTau0b1_bprime750bZbZ_ST.png r1 manage 52.3 K 2013-11-20 - 00:27 ChristianContreras
pdf L3DY1ZVZHTau0b1_bprime750tWtW_ST.pdf r1 manage 15.4 K 2013-11-19 - 19:23 ChristianContreras
png L3DY1ZVZHTau0b1_bprime750tWtW_ST.png r1 manage 52.9 K 2013-11-19 - 19:23 ChristianContreras
pdf L3DY1ZVZLTau0b1_bprime750bHbH_ST.pdf r1 manage 15.4 K 2013-11-22 - 02:05 ChristianContreras
png L3DY1ZVZLTau0b1_bprime750bHbH_ST.png r1 manage 206.0 K 2013-11-22 - 02:22 ChristianContreras
pdf L4DY1Tau1b0_bprime750bHbH_ST.pdf r1 manage 15.3 K 2013-11-22 - 02:05 ChristianContreras
png L4DY1Tau1b0_bprime750bHbH_ST.png r1 manage 203.4 K 2013-11-22 - 02:16 ChristianContreras
pdf L4DY2Tau0b1_bprime750bZbZ_ST.pdf r1 manage 15.0 K 2013-11-20 - 00:25 ChristianContreras
png L4DY2Tau0b1_bprime750bZbZ_ST.png r1 manage 51.5 K 2013-11-20 - 00:26 ChristianContreras
pdf L4DY2Tau0b1_bprime750tWtW_ST.pdf r1 manage 15.0 K 2013-11-19 - 18:54 ChristianContreras
png L4DY2Tau0b1_bprime750tWtW_ST.png r1 manage 51.8 K 2013-11-19 - 18:54 ChristianContreras
pdf ResultsTable3Lepton.pdf r1 manage 59.5 K 2013-11-19 - 22:39 ChristianContreras
png ResultsTable3Lepton.png r2 r1 manage 250.0 K 2013-11-20 - 01:49 ChristianContreras
pdf ResultsTable4Lepton.pdf r1 manage 138.4 K 2013-11-19 - 22:39 ChristianContreras
png ResultsTable4Lepton.png r2 r1 manage 260.4 K 2013-11-20 - 01:49 ChristianContreras
pdf SystematicTable.pdf r1 manage 68.0 K 2013-11-20 - 02:30 ChristianContreras
png SystematicTable.png r1 manage 192.4 K 2013-11-20 - 02:30 ChristianContreras
png TTbarControl_DiLepton_HT_CMS_Preliminary.png r1 manage 303.0 K 2013-11-20 - 18:06 ChristianContreras
png TTbarControl_DiLepton_MET_CMS_Preliminary.png r1 manage 293.8 K 2013-11-20 - 18:06 ChristianContreras
pdf TTbarControl_SingleMu_RelIso_CMS_Preliminary.pdf r1 manage 15.0 K 2013-11-20 - 18:41 ChristianContreras
png TTbarControl_SingleMu_RelIso_CMS_Preliminary.png r1 manage 173.9 K 2013-11-20 - 18:07 ChristianContreras
pdf TTbarControl_SingleMu_RelIso_electronNonPrompt_CMS_Preliminary.pdf r1 manage 14.8 K 2013-11-20 - 18:41 ChristianContreras
png TTbarControl_SingleMu_RelIso_electronNonPrompt_CMS_Preliminary.png r1 manage 168.2 K 2013-11-20 - 18:06 ChristianContreras
png TTbar_ST_controlPlot.png r1 manage 307.3 K 2013-11-21 - 17:43 ChristianContreras
pdf TriangleResultsTable.pdf r1 manage 45.1 K 2013-11-19 - 23:07 ChristianContreras
png TriangleResultsTable.png r2 r1 manage 302.3 K 2013-11-20 - 01:53 ChristianContreras
png WZControl_DiLepton_MET_CMS_Preliminary.png r1 manage 285.2 K 2013-11-20 - 18:06 ChristianContreras
png WZControl_DiLepton_MT_CMS_Preliminary.png r1 manage 132.0 K 2013-11-22 - 03:36 ChristianContreras
pdf bHbH_exclusion_limits_withRPV_1D.pdf r1 manage 14.6 K 2013-11-19 - 18:02 ChristianContreras
png bHbH_exclusion_limits_withRPV_1D.png r1 manage 151.1 K 2013-11-19 - 18:02 ChristianContreras
pdf bZbZ_exclusion_limits_withRPV_1D.pdf r1 manage 14.6 K 2013-11-18 - 23:16 ChristianContreras
png bZbZ_exclusion_limits_withRPV_1D.png r1 manage 140.8 K 2013-11-19 - 17:57 ChristianContreras
pdf bZtW_exclusion_limits_withRPV_2D.pdf r1 manage 23.7 K 2013-11-19 - 18:20 ChristianContreras
png bZtW_exclusion_limits_withRPV_2D.png r1 manage 106.7 K 2013-11-19 - 18:21 ChristianContreras
png fsr_mu3_invmass_19p5ifb.png r1 manage 194.3 K 2013-11-20 - 20:33 ChristianContreras
png mass_dist_met0to50GeVL4onZMass_PFMETvsAllMass.png r1 manage 284.8 K 2013-11-20 - 18:06 ChristianContreras
pdf rainbowPlot_exp_v6.pdf r1 manage 24.3 K 2013-11-19 - 18:29 ChristianContreras
png rainbowPlot_exp_v6.png r1 manage 190.4 K 2013-11-19 - 18:29 ChristianContreras
pdf rainbowPlot_obs_v3.pdf r1 manage 25.0 K 2013-11-19 - 18:30 ChristianContreras
png rainbowPlot_obs_v3.png r1 manage 200.8 K 2013-11-19 - 18:32 ChristianContreras
pdf tWtW_exclusion_limits_withRPV_1D.pdf r1 manage 14.6 K 2013-11-19 - 17:59 ChristianContreras
png tWtW_exclusion_limits_withRPV_1D.png r1 manage 147.3 K 2013-11-19 - 18:00 ChristianContreras
pdf triangle_exp_exlusion_limit_v0.pdf r1 manage 109.4 K 2013-11-19 - 18:37 ChristianContreras
png triangle_exp_exlusion_limit_v0.png r1 manage 252.2 K 2013-11-19 - 18:38 ChristianContreras
pdf triangle_obs_exlusion_limit_v0.pdf r1 manage 106.3 K 2013-11-19 - 18:38 ChristianContreras
png triangle_obs_exlusion_limit_v0.png r1 manage 245.6 K 2013-11-19 - 18:38 ChristianContreras
Topic revision: r18 - 2016-06-20 - ChristianContreras

Create a LeftBar

 Cern Search TWiki Search Google Search CMSPublic All webs
Copyright &© 2008-2021 by the contributing authors. All material on this collaboration platform is the property of the contributing authors.
or Ideas, requests, problems regarding TWiki? use Discourse or Send feedback