Cookies

We use cookies to ensure that we give you the best experience on our website. By continuing to browse this repository, you give consent for essential cookies to be used. You can read more about our Privacy and Cookie Policy.


Durham Research Online
You are in:

Top-quark pair production at high invariant mass : an NNLO soft plus virtual approximation.

Ferroglia, Andrea and Pecjak, Ben D. and Yang, Li Lin (2013) 'Top-quark pair production at high invariant mass : an NNLO soft plus virtual approximation.', Journal of high energy physics., 2013 (9). 032.

Abstract

e obtain a soft plus virtual approximation to the NNLO QCD contributions to the top-pair invariant mass distribution at hadron colliders. It is valid up to corrections of order m2t/M2mt2/M2, with M the pair invariant mass. This is currently the most complete QCD calculation for a differential cross section in top-quark pair production, and is useful for describing the high invariant mass region characteristic of boosted top quarks. We use our results to construct an improved NNLO approximation for the pair invariant mass distribution and compare it with previous, less complete approximations based on logarithmic terms from NNLL soft-gluon resummation alone. We find that the new NNLO approximation produces moderate enhancements of the differential cross section compared to previous ones, the effect being slightly more important at low values of invariant mass than at high ones. On the other hand, at high values of invariant mass the new NNLO corrections are dominated by even higher-order effects included in NNLL soft-gluon resummation, reaffirming the need for resummation in describing the highly boosted regime.

Item Type:Article
Full text:(NA) Not Applicable
Download PDF (arXiv version)
(2015Kb)
Status:Peer-reviewed
Publisher Web site:http://dx.doi.org/10.1007/JHEP09(2013)032
Publisher statement:The final publication is available at Springer via http://dx.doi.org/10.1007/JHEP09(2013)032
Date accepted:07 August 2013
Date deposited:No date available
Date of first online publication:06 September 2013
Date first made open access:No date available

Save or Share this output

Export:
Export
Look up in GoogleScholar