Extracting the Top-Quark Width from Nonresonant Production

Herwig, T. C.; Ježo, T.; Nachman, B. P.

doi:10.1103/physrevlett.122.231803

Cited by 12 publications

(8 citation statements)

References 69 publications

(104 reference statements)

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“…This is mainly because of the low experimental resolution to reconstruct the jet-related properties (e.g, jet reconstruction, jet energy resolution, jet energy scale, jet vertex fraction) [44][45][46][47]. New methods that use combinations of resonant and non-resonant cross-sections to extract a model independent top quark decay width measurement have been proposed [48][49][50], which can reduce the uncertainties significantly: Γ t = 1.28 ± 0.30 GeV [51]. However, O(10%) uncertainties still allow for large new physics contributions.…”

Section: Model Independent Limits On Exotic Top Decaysmentioning

confidence: 99%

The ALPs from the Top: Searching for long lived axion-like particles from exotic top decays

Carmona,

Elahi,

Scherb

et al. 2022

Preprint

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We propose a search for long lived axion-like particles (ALPs) in exotic top decays. Flavour-violating ALPs appear as low energy effective theories for various new physics scenarios such as t-channel dark sectors or Froggatt-Nielsen models. In this case the top quark may decay to an ALP and an up-or charm-quark. For masses in the few GeV range, the ALP is long lived across most of the viable parameter space, suggesting a dedicated search. We propose to search for these long lived ALPs in t t events, using one top quark as a trigger. We focus on ALPs decaying in the hadronic calorimeter, and show that the ratio of energy deposits in the electromagnetic and hadronic calorimeters as well as track vetoes can efficiently suppress Standard Model backgrounds. Our proposed search can probe exotic top branching ratios smaller than 10 −4 with a conservative strategy at the upcoming LHC run, and potentially below the 10 −7 level with more advanced methods. Finally we also show that measurements of single top production probe these branching ratios in the very short and very long lifetime limit at the 10 −3 level.

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Section: Model Independent Limits On Exotic Top Decaysmentioning

confidence: 99%

The ALPs from the Top: Searching for long lived axion-like particles from exotic top decays

Carmona,

Elahi,

Scherb

et al. 2022

Preprint

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“…Summary of Working Group 5: Heavy Flavours other properties such as width, spin correlations and couplings. The differential tW cross section [23] already discussed has allowed a direct determination of the top width [26] by using the interference in the tails of the b invariant mass distribution. The value obtained is 1.28 ± 0.30 GeV, which agrees with the SM prediction of 1.33 ± 0.29 GeV, and does not require the restrictive assumption of the indirect determinations [27] that the branching fraction for t → bW + is 100%.…”

Section: Pos(dis2019)283mentioning

confidence: 99%

Summary of Working Group 5: Physics with Heavy Flavours

Libby¹,

Bhardwaj²,

Virto³

2019

Proceedings of XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2019)

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“…Given the top mass is known to 0.2% [25] much more attention is now paid to determining its other properties such as width, spin correlations and couplings. The differential tW cross section [23] already discussed has allowed a direct determination of the top width [26] by using the interference in the tails of the b invariant mass distribution. The value obtained is 1.28 ± 0.30 GeV, which agrees with the SM prediction of 1.33 ± 0.29 GeV, and does not require the restrictive assumption of the indirect determinations [27] that the branching fraction for t → bW + is 100%.…”

Section: Top Propertiesmentioning

confidence: 99%