t-quark DECAY WIDTH

INSPIRE   PDGID:
Q007W
VALUE (GeV) CL% DOCUMENT ID TECN  COMMENT
1.42−0.15+0.19 OUR AVERAGE  Error includes scale factor of 1.4.
1.76 ±0.33 −0.68+0.79 1
AABOUD
2018AZ
 ATLS ℓ+E̸T+≥4j (≥1 b)
1.36 ±0.02 −0.11+0.14 2
KHACHATRYAN
2014E
 CMS ℓℓ+E̸T+2-4jets (0-2b-tag)
2.00 −0.43+0.47 3
ABAZOV
2012T
 D0 Γ( t → bW)/B( t → bW)
• • We do not use the following data for averages, fits, limits, etc. • •
<6.38 95 4
AALTONEN
2013Z
 CDF ℓ+E̸T+≥4j (≥0 b), direct
1.99 −0.55+0.69 5
ABAZOV
2011B
 D0 Repl. by ABAZOV 2012T
>1.21 95 5
ABAZOV
2011B
 D0 Γ( t → Wb)
<7.6 95 6
AALTONEN
2010AC
 CDF ℓ + jets, direct
<13.1 95 7
AALTONEN
2009M
 CDF mt(rec) distribution
1  Based on 20.2 fb−1 of pp data at s = 8 TeV. Γt is measured using a template fit to the reconstructed invariant mass of the b-jet of the semileptonically decaying top quark and the corresponding lepton, and the angular distance between jb and jl in hadronic top decay. Signal templates are generated by reweighting events at parton-level to Breit-Wigner distribution with different Γt hypotheses for mt = 172.5 GeV. The result is consistent with the NNLO SM prediction of 1.322 GeV.
2  Based on 19.7 fb−1 of pp data at s = 8 TeV. The result is obtained by combining the measurement of R = Γ( t → Wb)/Γ( t → Wq (q=b,s,d)) and a previous CMS measurement of the t-channel single top production cross section of CHATRCHYAN 2012BQ, by using the theoretical calculation of Γ( t → Wb) for mt = 172.5 GeV.
3  Based on 5.4 fb−1 of data in pp― collisions at 1.96 TeV. Γ( t → bW) = 1.87 −0.40+0.44 GeV is obtained from the observed t-channel single top quark production cross section, whereas B( t → bW) = 0.90 ±0.04 is used assuming ∑qB( t → qW) = 1. The result is valid for mt = 172.5 GeV. See the paper for the values for mt = 170 or 175 GeV.
4  Based on 8.7 fb−1 of data. The two sided 68% CL interval is 1.10 GeV < Γt < 4.05 GeV for mt = 172.5 GeV.
5  Based on 2.3 fb−1 in pp― collisions at s = 1.96 TeV. ABAZOV 2011B extracted Γt from the partial width Γ( t → Wb) = 1.92 −0.51+0.58 GeV measured using the t-channel single top production cross section, and the branching fraction br{ {{\mathit t}} \rightarrow {{\mathit W}} {{\mathit b}}} = 0.962 −0.066+0.068(stat)−0.052+0.064(syst). The Γ( t → Wb) measurement gives the 95% CL lowerbound of Γ( t → Wb) and hence that of Γt.
6  Results are based on 4.3 fb−1 of data in pp― collisions at s = 1.96 TeV. The top quark mass and the hadronically decaying W boson mass are reconstructed for each candidate events and compared with templates of different top quark width. The two sided 68% CL interval is 0.3 GeV< Γt< 4.4 GeV for mt = 172.5 GeV.
7  Based on 955 pb−1 of pp― collision data at s = 1.96 TeV. AALTONEN 2009M selected tt― candidate events for the ℓ + E̸T + jets channel with one or two b-tags, and examine the decay width dependence of the reconstructed mt distribution. The result is for mt =175 GeV, whereas the upper limit is lower for smaller mt.
References
AABOUD 2018AZ
EPJ C78 129 Direct top-quark decay width measurement in the tt¯ lepton+jets channel at s=8 TeV with the ATLAS experiment
KHACHATRYAN 2014E
PL B736 33 Measurement of the Ratio B( t → Wb)/B( t → Wq) in pp Collisions at s = 8 TeV
AALTONEN 2013Z
PRL 111 202001 Direct Measurement of the Total Decay Width of the Top Quark
ABAZOV 2012T
PR D85 091104 Improved Determination of the Width of the Top Quark
ABAZOV 2011B
PRL 106 022001 Determination of the Width of the Top Quark
AALTONEN 2010AC
PRL 105 232003 Direct Top-Quark Width Measurement at CDF
AALTONEN 2009M
PRL 102 042001 Direct Bound on the Total Decay Width of the Top Quark in pp― Collisions at s = 1.96 TeV