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Top and bottom quark forward-backward asymmetries at next-to-next-to-leading order QCD in (un)polarized electron positron collisions
- Source :
- Journal of High Energy Physics, Vol 2023, Iss 5, Pp 1-23 (2023)
- Publication Year :
- 2023
- Publisher :
- SpringerOpen, 2023.
-
Abstract
- Abstract We consider, at order α s 2 $$ {\alpha}_s^2 $$ in the QCD coupling, top-quark pair production in the continuum at various center-of-mass energies and b-quark pair production at the Z resonance by (un)polarized electron and positron beams. For top quarks we compute the forward-backward asymmetry with respect to the top-quark direction of flight, the associated polar angle distribution, and we analyze the effect of beam polarization on the QCD corrections to the leading-order asymmetry. We calculate also the polarized forward-backward asymmetry. For b-quark production at the Z peak we explore different definitions of A FB. In particular, we analyze b jets defined by the Durham and the flavor-k T clustering algorithms. We compute the inclusive b-jet and two-jet asymmetry with respect to the b-jet direction. For the latter asymmetry the QCD corrections to order α s 2 $$ {\alpha}_s^2 $$ are small. That predestines it to act as a precision observable.
Details
- Language :
- English
- ISSN :
- 10298479
- Volume :
- 2023
- Issue :
- 5
- Database :
- Directory of Open Access Journals
- Journal :
- Journal of High Energy Physics
- Publication Type :
- Academic Journal
- Accession number :
- edsdoj.859843ab8fc4e74bfce29c36724ccdc
- Document Type :
- article
- Full Text :
- https://doi.org/10.1007/JHEP05(2023)094