TY - JOUR
T1 - Bound-state effects on top quark production at hadron colliders
AU - Hagiwara, Kaoru
AU - Sumino, Yukinari
AU - Yokoya, Hiroshi
N1 - Funding Information:
We are grateful to the referee for drawing our attention to Ref. [12] . We are also grateful to M. Czakon, A. Mitov and the authors of Refs. [4,12] (especially M. Mangano, F. Maltoni and P. Nason) for valuable communications. The works of K.H. and Y.S. are supported in part by Grant-in-Aid for scientific research (Nos. 17540281 and 17540228, respectively) from MEXT, Japan. We thank M. Nojiri for organizing an LHC-focus week meeting at the IPMU (Institute for the Physics and Mathematics of the Universe) in December 2007, where we enjoyed stimulating discussions.
PY - 2008/8/7
Y1 - 2008/8/7
N2 - We study bound-state effects on the t over(t, ̄) production cross section in the threshold region at hadron colliders. The bound-state effects are important particularly at the LHC where the gluon fusion is the dominant subprocess. Due to the formation of t over(t, ̄) resonances in the J = 0 color-singlet channel of g g → t over(t, ̄) and the large width of the top quark, the t over(t, ̄) invariant-mass distribution peaks at a few GeV below the t over(t, ̄) threshold, and it is significantly enhanced over the naive NLO prediction until several GeV above the threshold. We present predictions of the t over(t, ̄) invariant-mass distribution which incorporate both the bound-state effects and initial-state radiations up to NLO. The bound-state effects would lead to a substantial deformation of top-quark kinematical distributions in the threshold region.
AB - We study bound-state effects on the t over(t, ̄) production cross section in the threshold region at hadron colliders. The bound-state effects are important particularly at the LHC where the gluon fusion is the dominant subprocess. Due to the formation of t over(t, ̄) resonances in the J = 0 color-singlet channel of g g → t over(t, ̄) and the large width of the top quark, the t over(t, ̄) invariant-mass distribution peaks at a few GeV below the t over(t, ̄) threshold, and it is significantly enhanced over the naive NLO prediction until several GeV above the threshold. We present predictions of the t over(t, ̄) invariant-mass distribution which incorporate both the bound-state effects and initial-state radiations up to NLO. The bound-state effects would lead to a substantial deformation of top-quark kinematical distributions in the threshold region.
UR - http://www.scopus.com/inward/record.url?scp=47749140698&partnerID=8YFLogxK
UR - http://www.scopus.com/inward/citedby.url?scp=47749140698&partnerID=8YFLogxK
U2 - 10.1016/j.physletb.2008.07.006
DO - 10.1016/j.physletb.2008.07.006
M3 - Article
AN - SCOPUS:47749140698
SN - 0370-2693
VL - 666
SP - 71
EP - 76
JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
JF - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
IS - 1
ER -