Bound-state effects on kinematical distributions of top quarks at hadron colliders

Article
Report number	arXiv:1007.0075 ; TU-867 ; CERN-PH-TH-2010-147
Title	Bound-state effects on kinematical distributions of top quarks at hadron colliders
Author(s)	Sumino, Yukinari (Tohoku U.) ; Yokoya, Hiroshi (CERN)
Publication	2010
Imprint	02 Jul 2010
Number of pages	41
Note	40 pages, 25 figures; minor corrections, references added; a typo in Eq. (B.9) corrected
In:	JHEP 09 (2010) pp.034 JHEP 06 (2016) pp.037
DOI	10.1007/JHEP09(2010)034 10.1007/JHEP06(2016)037 (Erratum)
Subject category	Particle Physics - Phenomenology
Abstract	First we present a theoretical framework to compute the fully differential cross sections for the top-quark productions and their subsequent decays at hadron colliders, incorporating the bound-state effects which are important in the t\bar{t} threshold region. We include the bound-state effects such that the cross sections are correct in the LO approximation both in the threshold and high-energy regions. Then, based on this framework we compute various kinematical distributions of top quarks as well as of their decay products at the LHC, by means of Monte-Carlo event-generation. These are compared with the corresponding predictions based on conventional perturbative QCD. In particular, we find a characteristic bound-state effect on the (bW^+)-(\bar{b}W^-) double-invariant-mass distribution, which is deformed to the lower invariant-mass side in a correlated manner.
Copyright/License	Open Access preprint: © 2010-2024 CERN (License: CC-BY-3.0) publication: © 2016-2024 The Author(s) (License: CC-BY-4.0), sponsored by SCOAP³