| $\bf{> 1280}$ |
95 |
1 |
|
CMS |
| $>1370$ |
95 |
2 |
|
CMS |
| $>980$ |
95 |
3 |
|
ATLS |
| $> 1010$ |
95 |
4 |
|
ATLS |
| $> 1030$ |
95 |
5, 6 |
|
ATLS |
| $> 1210$ |
95 |
5, 7 |
|
ATLS |
| $\bf{> 1310}$ |
95 |
8, 9 |
|
ATLS |
| $\bf{> 1370}$ |
95 |
8, 10 |
|
ATLS |
| $> 1140$ |
95 |
11 |
|
CMS |
| $> 845$ |
95 |
12 |
|
CMS |
| $\bf{> 1295}$ |
95 |
13 |
|
CMS |
| $>1160$ |
95 |
14 |
|
ATLS |
| $>860$ |
95 |
15 |
|
CMS |
| $> 770$ |
95 |
16 |
|
ATLS |
| $> 590$ |
95 |
17 |
|
ATLS |
| $> 745$ |
95 |
18 |
|
CMS |
| $> 735$ |
95 |
19 |
|
ATLS |
| $> 700$ |
95 |
20 |
|
CMS |
| $> 706$ |
95 |
20 |
|
CMS |
| $> 782$ |
95 |
20 |
|
CMS |
| $> 350$ |
95 |
21 |
|
ATLS |
| $> 420$ |
95 |
22 |
|
ATLS |
| $> 685$ |
95 |
23 |
|
CMS |
| $> 557$ |
95 |
24 |
|
CMS |
| • • • We do not use the following data for averages, fits, limits, etc. • • • |
| $> 656$ |
95 |
25 |
|
ATLS |
| $> 625$ |
95 |
26 |
|
CMS |
| $> 404$ |
95 |
27 |
|
ATLS |
| $> 570$ |
95 |
28 |
|
CMS |
| $> 400$ |
95 |
29 |
|
CDF |
| $> 358$ |
95 |
30 |
|
CDF |
| $> 340$ |
95 |
30 |
|
CDF |
| $> 360$ |
95 |
31 |
|
CDF |
| $> 285$ |
95 |
32 |
|
D0 |
| $> 256$ |
95 |
33, 34 |
|
CDF |
|
1
SIRUNYAN 2019AQ based on 35.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. Pair production of vector-like ${{\mathit t}^{\,'}}$ is seached for with one ${{\mathit t}^{\,'}}$ decaying into ${{\mathit Z}}{{\mathit t}}$ and the other ${{\mathit t}^{\,'}}$ decaying into ${{\mathit W}}{{\mathit b}}$ , ${{\mathit Z}}{{\mathit t}}$ , ${{\mathit h}}{{\mathit t}}$ . Events with an opposite-sign lepton pair consistent with coming from ${{\mathit Z}}$ and jets are used. Mass limits are obtained for a variety of branching ratios of ${{\mathit t}^{\,'}}$.
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2
SIRUNYAN 2019BW based on 35.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. The limit is for the pair-produced vector-like ${{\mathit t}^{\,'}}$ using all-hadronic final state. The analysis is made for the ${{\mathit W}}{{\mathit b}}$ , ${{\mathit Z}}{{\mathit t}}$ , ${{\mathit h}}{{\mathit t}}$ modes and mass limits are obtained for a variety of branching ratios.
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3
AABOUD 2018CE based on 36.1 fb${}^{-1}$ of proton-proton data taken at $\sqrt {s }$ = 13 TeV. Events including a same-sign lepton pair are used. The limit is for a singlet model, assuming the branching ratios of ${{\mathit t}^{\,'}}$ into ${{\mathit Z}}{{\mathit t}}$ , ${{\mathit W}}{{\mathit b}}$ and ${{\mathit H}}{{\mathit t}}$ as predicted by the model.
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4
AABOUD 2018CL based on 36.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. The limit is for the pair-produced vector-like ${{\mathit t}^{\,'}}$ using all-hadronic final state. The analysis is also made for the ${{\mathit W}}{{\mathit b}}$ , ${{\mathit Z}}{{\mathit t}}$ , ${{\mathit h}}{{\mathit t}}$ modes and mass limits are obtained for a variety of branching ratios.
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5
AABOUD 2018CP based on 36.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. Pair and single production of vector-like ${{\mathit t}^{\,'}}$ are seached for with at least one ${{\mathit t}^{\,'}}$ decaying into ${{\mathit Z}}{{\mathit t}}$ . In the case of B( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit Z}}{{\mathit t}}$ ) = 1, the limit is ${\mathit m}_{{{\mathit t}^{\,'}}}$ $>$ 1340 GeV.
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6
The limit is for the singlet model, assuming that the branching ratios into ${{\mathit Z}}{{\mathit t}}$ , ${{\mathit W}}{{\mathit b}}$ , and ${{\mathit H}}{{\mathit t}}$ add up to one.
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7
The limit is for the doublet model, assuming that the branching ratios into ${{\mathit Z}}{{\mathit t}}$ , ${{\mathit W}}{{\mathit b}}$ , and ${{\mathit H}}{{\mathit t}}$ add up to one.
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8
AABOUD 2018CR based on 36.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. A combination of searches for the pair-produced vector-like ${{\mathit t}^{\,'}}$ in various decay channels ( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit W}}{{\mathit b}}$ , ${{\mathit Z}}{{\mathit t}}$ , ${{\mathit h}}{{\mathit t}}$ ). Also a model-independent limit is obtained as ${\mathit m}_{{{\mathit t}^{\,'}}}$ $>$ 1.31 TeV, assuming that the branching ratios into ${{\mathit Z}}{{\mathit t}}$ , ${{\mathit W}}{{\mathit b}}$ and ${{\mathit h}}{{\mathit t}}$ add up to one.
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9
The limit is for the singlet ${{\mathit t}^{\,'}}$.
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10
The limit is for ${{\mathit t}^{\,'}}$ in a weak isospin doublet (${{\mathit t}^{\,'}},{{\mathit b}^{\,'}}$) and $\vert {{\mathit V}}_{{{\mathit t}^{\,'}}{{\mathit b}}}\vert $ ${}\ll$ $\vert {{\mathit V}}_{{{\mathit t}}{{\mathit b}^{\,'}}}\vert $.
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11
SIRUNYAN 2018BM based on 35.9 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. The limit is for the pair-produced vector-like ${{\mathit t}^{\,'}}$. Three channels (single lepton, same-charge 2 leptons, or at least 3 leptons) are considered for various branching fraction combinations. Assuming B( ${{\mathit t}}{{\mathit H}}$ ) = 1, the limit is 1270 GeV and for B( ${{\mathit t}}{{\mathit Z}}$ ) = 1 it is 1300 GeV.
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12
SIRUNYAN 2018Q based on 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 8 TeV. The limit is for the pair-produced vector-like ${{\mathit t}^{\,'}}$ that couple only to light quarks. Constraints for other decay channels ( ${{\mathit Z}}{{\mathit q}}$ and ${{\mathit H}}{{\mathit q}}$ ) are also given in the paper.
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13
SIRUNYAN 2018W based on 35.8 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. The limit is for the vector-like ${{\mathit t}^{\,'}}$ pair-produced by strong interaction using lepton-plus-jets mode and assuming that B( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit W}}{{\mathit b}}$ ) is 100%. Generally the measurement sets upper limits on the product of the production cross section and branching faction to ${{\mathit W}}{{\mathit b}}$ for any new pair-produced heavy quark decaying to this channel as a narrow resonance.
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14
AABOUD 2017L based on 36.1 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. No signal is found in the search for heavy quark pair production that decay into ${{\mathit Z}}{{\mathit t}}$ followed by ${{\mathit Z}}$ $\rightarrow$ ${{\mathit \nu}}{{\mathit \nu}}$ in the events with one lepton, large $\not E_T$, and ${}\geq{}$4 jets. The lower mass limit 0.87 (1.05) TeV is obtained for the singlet (doublet) model with other possible decay modes.
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15
SIRUNYAN 2017AU based on 2.3-2.6 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 13 TeV. Limit on pair-produced singlet vector-like ${{\mathit t}^{\,'}}$ using one lepton and several jets. The mass bound is given for a ${{\mathit t}^{\,'}}$ transforming as a singlet under the electroweak symmetry group, assumed to decay through ${{\mathit W}}$, ${{\mathit Z}}$ or Higgs boson (which decays to jets) and to a third generation quark. For a doublet, the limit is $>$830 GeV. Other limits are also given in the paper.
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16
AAD 2015AR based on 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 8 TeV. Used lepton-plus-jets final state. See Fig. 20 for mass limits in the plane of B( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit H}}{{\mathit t}}$ ) vs. B( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit W}}{{\mathit b}}$ ) from a combination of ${{\mathit t}^{\,'}}$ ${{\overline{\mathit t}}^{\,'}}$ $\rightarrow$ ${{\mathit W}}{{\mathit b}}{+}$ ${{\mathit X}}$ and ${{\mathit t}^{\,'}}$ ${{\overline{\mathit t}}^{\,'}}$ $\rightarrow$ ${{\mathit H}}{{\mathit t}}{+}$ ${{\mathit X}}$ searches. Any branching ratio scenario is excluded for mass below 715 GeV.
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17
AAD 2015BY based on 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 8 TeV. Limit on pair-produced vector-like ${{\mathit t}^{\,'}}$ assuming the branching fractions to ${{\mathit W}}$, ${{\mathit Z}}$, and ${{\mathit h}}$ modes of the singlet model. Used events containing ${}\geq{}2{{\mathit \ell}}$ + $\not E_T$ + ${}\geq{}$2j (${}\geq{}$1 ${{\mathit b}}$) and including a same-sign lepton pair.
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18
KHACHATRYAN 2015AI based on 19.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 8 TeV. The search exploits all-hadronic final states by tagging boosted Higgs boson using jet substructure and ${{\mathit b}}$-tagging.
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19
Based on 20.3 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 8 TeV. No significant excess over SM expectation is found in the search for pair production or single production of ${{\mathit t}^{\,'}}$ in the events with dilepton from a high $p_T$ ${{\mathit Z}}$ and additional jets (${}\geq{}$ 1 ${{\mathit b}}$-tag). If instead of B( ${{\mathit b}^{\,'}}$ $\rightarrow$ ${{\mathit W}}{{\mathit t}}$ ) = 1 an electroweak singlet with B( ${{\mathit b}^{\,'}}$ $\rightarrow$ ${{\mathit W}}{{\mathit t}}$ ) $\sim{}$ 0.45 is assumed, the limit reduces to 685 GeV.
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20
Based on 19.5 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 8TeV. The ${{\mathit t}^{\,'}}$ quark is pair produced and is assumed to decay into three different final states of , , and . The search is carried out using events with at least one isolated lepton.
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21
Based on 1.04 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 7 TeV. No signal is found for the search of heavy quark pair production that decay into ${{\mathit W}}$ and a quark in the events with dileptons, large $\not E_T$, and ${}\geq{}$2 jets.
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22
Based on 1.04 fb${}^{-1}$ of data in ${{\mathit p}}{{\mathit p}}$ collisions at 7 TeV. AAD 2012C looked for ${{\mathit t}^{\,'}}{{\overline{\mathit t}}^{\,'}}$ production followed by ${{\mathit t}^{\,'}}$ decaying into a top quark and ${{\mathit X}}$, an invisible particle, in a final state with an isolated high-P$_{T}$ lepton, four or more jets, and a large missing transverse energy. No excess over the SM ${{\mathit t}}{{\overline{\mathit t}}}$ production gives the upper limit on ${{\mathit t}^{\,'}}{{\overline{\mathit t}}^{\,'}}$ production cross section as a function of ${\mathit m}_{{{\mathit t}^{\,'}}}$ and ${\mathit m}_{{{\mathit X}}}$. The result is obtained for B( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit W}}{{\mathit t}}$ ) = 1.
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23
Based on 5 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 7 TeV. CHATRCHYAN 2012BH searched for QCD and EW production of single and pair of degenerate 4'th generation quarks that decay to ${{\mathit W}}{{\mathit b}}$ or ${{\mathit W}}{{\mathit t}}$ . Absence of signal in events with one lepton, same-sign dileptons or tri-leptons gives the bound. With a mass difference of 25 GeV/c${}^{2}$ between ${\mathit m}_{{{\mathit t}^{\,'}}}$ and ${\mathit m}_{{{\mathit b}^{\,'}}}$, the corresponding limit shifts by about $\pm20$ GeV/c${}^{2}$.
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24
Based on 5.0 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 7 TeV. CHATRCHYAN 2012P looked for ${{\mathit t}^{\,'}}{{\overline{\mathit t}}^{\,'}}$ production events with two isolated high $p_T$ leptons, large $\not E_T$, and 2 high $p_T$ jets with ${{\mathit b}}$-tag. The absence of signal above the SM background gives the limit for B( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit W}}{{\mathit b}}$ ) = 1.
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25
Based on 4.7 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 7 TeV. No signal is found for the search of heavy quark pair production that decay into ${{\mathit W}}$ and a ${{\mathit b}}$ quark in the events with a high $p_T$ isolated lepton, large $\not E_T$ and at least 3 jets (${}\geq{}$ 1 ${{\mathit b}}$-tag). Vector-like quark of charge 2/3 with 400 $<$ ${\mathit m}_{{{\mathit t}^{\,'}}}$ $<$ 550 GeV and B( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit W}}{{\mathit b}}$ ) $>$ 0.63 is excluded at 95$\%$ CL.
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26
Based on 5.0 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 7 TeV. CHATRCHYAN 2013I looked for events with one isolated electron or muon, large $\not E_T$, and at least four jets with large transverse momenta, where one jet is likely to originate from the decay of a bottom quark.
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27
Based on 1.04 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 7 TeV. No signal is found in the search for pair produced heavy quarks that decay into ${{\mathit W}}$ boson and a ${{\mathit b}}$ quark in the events with a high $p_T$ isolated lepton, large $\not E_T$ and at least 3 jets (${}\geq{}$1 ${{\mathit b}}$-tag).
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28
Based on 5.0 fb${}^{-1}$ of ${{\mathit p}}{{\mathit p}}$ data at $\sqrt {s }$ = 7 TeV. CHATRCHYAN 2012BC looked for ${{\mathit t}^{\,'}}{{\overline{\mathit t}}^{\,'}}$ production events with a single isolated high $p_T$ lepton, large $\not E_T$ and at least 4 high $p_T$ jets with a ${{\mathit b}}$-tag. The absence of signal above the SM background gives the limit for B( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit W}}{{\mathit b}}$ ) = 1.
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29
Based on 5.7 fb${}^{-1}$ of data in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at 1.96 TeV. AALTONEN 2011AH looked for ${{\mathit t}^{\,'}}{{\overline{\mathit t}}^{\,'}}$ production followed by ${{\mathit t}^{\,'}}$ decaying into a top quark and ${{\mathit X}}$, an invisible particle, in the all hadronic decay mode of ${{\mathit t}}{{\overline{\mathit t}}}$ . No excess over the SM ${{\mathit t}}{{\overline{\mathit t}}}$ production gives the upper limit on ${{\mathit t}^{\,'}}{{\overline{\mathit t}}^{\,'}}$ production cross section as a function of ${\mathit m}_{{{\mathit t}^{\,'}}}$ and ${\mathit m}_{{{\mathit X}}}$. The result is obtained for B( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit X}}{{\mathit t}}$ ) = 1.
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30
Based on 5.6 fb${}^{-1}$ of data in ppbar collisions at 1.96 TeV. AALTONEN 2011AL looked for ${{\mathit \ell}}$ + ${}\geq{}$4j events and set upper limits on ${\mathit \sigma (}$ ${{\mathit t}^{\,'}}{{\overline{\mathit t}}^{\,'}}{)}$ as functions of ${\mathit m}_{{{\mathit t}^{\,'}}}$.
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31
Based on 4.8 fb${}^{-1}$ of data in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at 1.96 TeV. AALTONEN 2011O looked for ${{\mathit t}^{\,'}}{{\overline{\mathit t}}^{\,'}}$ production signal when ${{\mathit t}^{\,'}}$ decays into a top quark and ${{\mathit X}}$, an invisible particle, in ${{\mathit \ell}}$ + $\not E_T$ + jets channel. No excess over the SM ${{\mathit t}}{{\overline{\mathit t}}}$ production gives the upper limit on ${{\mathit t}^{\,'}}{{\overline{\mathit t}}^{\,'}}$ production cross section as a function of ${\mathit m}_{{{\mathit t}^{\,'}}}$ and ${\mathit m}_{{{\mathit X}}}$. The result is obtained for B( ${{\mathit t}^{\,'}}$ $\rightarrow$ ${{\mathit X}}{{\mathit t}}$ ) = 1.
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32
Based on 5.3 fb${}^{-1}$ of data in ${{\mathit p}}{{\overline{\mathit p}}}$ collisions at 1.96 TeV. ABAZOV 2011Q looked for ${{\mathit \ell}}$ + $\not E_T$ + ${}\geq{}$4j events and set upper limits on ${\mathit \sigma (}$ ${{\mathit t}^{\,'}}{{\overline{\mathit t}}^{\,'}}{)}$ as functions of ${\mathit m}_{{{\mathit t}^{\,'}}}$.
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33
Searches for pair production of a new heavy top-like quark ${{\mathit t}^{\,'}}$ decaying to a ${{\mathit W}}$ boson and another quark by fitting the observed spectrum of total transverse energy and reconstructed ${{\mathit t}^{\,'}}$ mass in the lepton + jets events.
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34
HUANG 2008 reexamined the ${{\mathit t}^{\,'}}$ mass lower bound of 256 GeV obtained in AALTONEN 2008H that assumes B( ${{\mathit b}^{\,'}}$ $\rightarrow$ ${{\mathit q}}{{\mathit Z}}$ ) = 1 for ${{\mathit q}}$ = ${{\mathit u}}$, ${{\mathit c}}$ which does not hold when ${\mathit m}_{{{\mathit b}^{\,'}}}<{\mathit m}_{{{\mathit t}^{\,'}}}−{\mathit m}_{{{\mathit W}}}$ or the mixing sin$^2(\theta _{ {{\mathit b}} {{\mathit t}^{\,'}} })$ is so tiny that the decay occurs outside of the vertex detector. Fig. 1 gives that lower bound on ${\mathit m}_{{{\mathit t}^{\,'}}}$ in the plane of sin$^2(\theta _{ {{\mathit b}} {{\mathit t}^{\,'}} })$ and ${\mathit m}_{{{\mathit b}^{\,'}}}$.
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