Modeling uncertainties of t t ¯ W ± multilepton signatures

Bevilacqua, G.; Bi, H. Y.; Febres Cordero, F.; Hartanto, H. B.; Kraus, M.; Nasufi, J.; Reina, L.; Worek, M.

doi:10.1103/PhysRevD.105.014018

Title: Modeling uncertainties of $t \bar{t} W^{\pm}$ multilepton signatures

Journal Article · Fri Jan 21 00:00:00 EST 2022 · Physical Review D

DOI:https://doi.org/10.1103/PhysRevD.105.014018· OSTI ID:1841641

;

; Hartanto, H. B.;

;

In light of recent discrepancies between the modeling of tt¯W^± signatures and measurements reported by the Large Hadron Collider (LHC) experimental collaborations, we investigate in detail theoretical uncertainties for multi-lepton signatures. Here, we compare results from the state-of-the-art full off-shell calculation and its Narrow Width Approximation to results obtained from the on-shell tt¯W^± calculation, with approximate spin-correlations in top-quark and W decays, matched to parton showers. In the former case double-, single-, and non-resonant contributions together with interference effects are taken into account, while the latter two cases are only based on the double resonant top-quark contributions. The comparison is performed for the LHC at √s=13 TeV for which we study separately the multi-lepton signatures as predicted from the dominant NLO contributions at the perturbative orders O($$α$$$^{3}_{s}$$α⁶) and O(α_sα⁸). Furthermore, we combine both contributions and propose a simple way to approximately incorporate the full off-shell effects in the NLO computation of on-shell pp → tt¯W^± matched to parton showers.

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Research Organization:: Florida State Univ., Tallahassee, FL (United States)

Sponsoring Organization:: USDOE

Grant/Contract Number:: SC0010102

OSTI ID:: 1841641

Alternate ID(s):: OSTI ID: 1865595

Journal Information:: Physical Review D, Journal Name: Physical Review D Vol. 105 Journal Issue: 1; ISSN 2470-0010

Publisher:: American Physical SocietyCopyright Statement

Country of Publication:: United States

Language:: English

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Title: Modeling uncertainties of t t ¯ W ± multilepton signatures

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Title: Modeling uncertainties of $t \bar{t} W^{\pm}$ multilepton signatures