Search for anomalous couplings in the <i>Wtb</i> vertex from the measurement of double differential angular decay rates of single top quarks produced in the <i>t</i>-channel with the ATLAS detector



Aad, G, Abbott, B, Abdallah, J, Abdinov, O, Aben, R, Abolins, M, AbouZeid, OS, Abramowicz, H, Abreu, H, Abreu, R
et al (show 2856 more authors) (2016) Search for anomalous couplings in the <i>Wtb</i> vertex from the measurement of double differential angular decay rates of single top quarks produced in the <i>t</i>-channel with the ATLAS detector. JOURNAL OF HIGH ENERGY PHYSICS, 04 (4). 023-.

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Abstract

The electroweak production and subsequent decay of single top quarks is determined by the properties of the $Wtb$ vertex. This vertex can be described by the complex parameters of an effective Lagrangian. An analysis of angular distributions of the decay products of single top quarks produced in the $t$-channel constrains these parameters simultaneously. The analysis described in this paper uses 4.6 fb$^{-1}$ of proton-proton collision data at $\sqrt{s}$ = 7 TeV collected with the ATLAS detector at the LHC.Two parameters are measured simultaneously in this analysis. The fraction $f_1$ of decays containing transversely polarised $W$ bosons is measured to be $0.37 \pm 0.07$ (stat.$\oplus$syst.). The phase $\delta_{-}$ between amplitudes for transversely and longitudinally polarised $W$ bosons recoiling against left-handed $b$-quarks is measured to be $-0.14\pi \pm 0.036\pi$ (stat.$\oplus$syst.).The correlation in the measurement of these parameters is $0.15$. These values result in two-dimensional limits at the 95% confidence level on the ratio of the complex coupling parameters $g_\mathrm{R}$ and $V_\mathrm{L}$, yielding Re [$g_\mathrm{R}/V_\mathrm{L}$] $\in [-0.36,0.10]$ and Im [$g_\mathrm{R}/V_\mathrm{L}$] $\in [-0.17,0.23]$ with a correlation of 0.11. The results are in good agreement with the predictions of the Standard Model.

Item Type: Article
Additional Information: 26 pages plus author list + cover pages (42 pages total), 8 figures, 2 tables, submitted to JHEP, All figures including auxiliary figures are available at https://atlas.web.cern.ch/Atlas/GROUPS/PHYSICS/PAPERS/TOPQ-2013-12
Uncontrolled Keywords: Hadron-Hadron scattering
Depositing User: Symplectic Admin
Date Deposited: 14 Mar 2017 11:44
Last Modified: 18 Oct 2023 07:33
DOI: 10.1007/JHEP04(2016)023
Related URLs:
URI: https://livrepository.liverpool.ac.uk/id/eprint/3006016