A precise characterisation of the top quark electro-weak vertices at the ILC

Amjad, M.S.; Rouëné, J.; Richard, F.; Doublet, P.; Ros, E.; Boronat, M.; Perelló, M.; Pöschl, R.; Frisson, T.; Ruiz Femenia, P.; García, I.García; Bilokin, S.; Vos, M.

doi:10.1140/epjc/s10052-015-3746-5

Article
Report number	arXiv:1505.06020 ; IFIC-15-15 ; LAL-15-111 ; IFIC-15-15 ; LAL 15-111
Title	A precise characterisation of the top quark electro-weak vertices at the ILC
Author(s)	Amjad, M.S. (Orsay, LAL ; COMSATS, Islamabad) ; Bilokin, S. (Orsay, LAL) ; Boronat, M. (Valencia U., IFIC) ; Doublet, P. (Orsay, LAL ; IUT, Orsay) ; Frisson, T. (Orsay, LAL ; CERN) ; García, I.García (Valencia U., IFIC) ; Perelló, M. (Valencia U., IFIC) ; Pöschl, R. (Orsay, LAL ; Orsay) ; Richard, F. (Orsay, LAL ; Orsay) ; Ros, E. (Valencia U., IFIC) ; Rouëné, J. (Orsay, LAL ; Orsay) ; Ruiz Femenia, P. (Valencia U., IFIC ; Munich, Tech. U.) ; Vos, M. (Valencia U., IFIC)
Publication	2015-10-29
Imprint	22 May 2015
Number of pages	15
Note	This work is an update of arXiv:1307.8102, minor changes w.r.t. v1 (typos, wrong grammar, incomplete sentences etc.)
In:	Eur. Phys. J. C 75 (2015) 512
DOI	10.1140/epjc/s10052-015-3746-5
Subject category	Particle Physics - Experiment
Abstract	Top quark production in the process $e^+e^- \rightarrow t\bar{t}$ at a future linear electron positron collider with polarised beams is a powerful tool to determine indirectly the scale of new physics. The presented study, based on a detailed simulation of the ILD detector concept, assumes a centre-of-mass energy of $\sqrt{s}=500$ GeV and a luminosity of $\mathcal{L}=500\,\mbox{fb}^{-1} $ equally shared between the incoming beam polarisations of ${\cal P}_{e^-} , {\cal P}_{e^+} =\pm0.8,\mp0.3$. Events are selected in which the top pair decays semi-leptonically and the cross sections and the forward-backward asymmetries are determined. Based on these results, the vector, axial vector and tensorial $CP$ conserving couplings are extracted seperately for the photon and the $Z^0$ component. With the expected precision, a large number of models in which the top quark acts as a messenger to new physics can be distinguished with many standard deviations. This will dramatically improve expectation from e.g. LHC for electro-weak couplings of the top quark.
Copyright/License	arXiv nonexclusive-distrib. 1.0

$\sl \underline{Left:} Reconstructed forward-backward asymmetry compared with the prediction by the event generator {\sc WHIZARD} {\protect \cite{Kilian:2007gr}} for two configurations of the beam polarisations. \underline{Right:} The same but after the application of a on $\chi^2<15$ for the beam polarisations $\pem,\pep =-1,+1$ as explained in the text. Note, that in both figures no correction is applied for the beam polarisations $\pem,\pep =+1,-1$. The figure on the right hand side shows also the residual Standard Model background.$ $\sl \underline{Left:} Reconstructed forward-backward asymmetry compared with the prediction by the event generator {\sc WHIZARD} {\protect \cite{Kilian:2007gr}} for two configurations of the beam polarisations. \underline{Right:} The same but after the application of a on $\chi^2<15$ for the beam polarisations $\pem,\pep =-1,+1$ as explained in the text. Note, that in both figures no correction is applied for the beam polarisations $\pem,\pep =+1,-1$. The figure on the right hand side shows also the residual Standard Model background.$ $\sl Graphical comparison of statistical precisions on $CP$ conserving form factors expected at the LHC, taken from~\cite{Baur:2004uw} and~\cite{Baur:2005wi}, and at the ILC. The LHC results assume an integrated luminosity of $\mathcal{L}=3000~\invfb$ at $\roots=14\,\TeV$. The results for the ILC assume an integrated luminosity of $\mathcal{L}=500~\invfb$ at $\roots=500\,\GeV$ and a beam polarisation $\pem=\pm0.8,\pep = \mp0.3$.$ Show more plots

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Записът е създаден на 2015-05-25, последна промяна на 2023-05-27

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