On the topaantitop invariant mass spectrum at the LHC from a Higgs boson signal perspective

We investigate the effect of one-loop corrections of O ( I- S 2 I- W ) on the t t A= invariant mass spectrum at the Large Hadron Collider (LHC) in presence of both resonant and non-resonant Higgs boson effects. We show that corrections of O ( I- S 2 I- W ) involving a non-resonant Higgs boson are co...

Full description

Saved in:
Bibliographic Details
Published in:Physics letters. B 2012-06, Vol.712 (3), p.245-249
Main Authors: Moretti, S, Ross, DA
Format: Article
Language:English
Subjects:
Amplitudes
Elementary particles
Hadrons
Higgs bosons
Interference
Invariants
Online Access:Get full text
Tags: Add Tag
No Tags, Be the first to tag this record!
Description
Summary:We investigate the effect of one-loop corrections of O ( I- S 2 I- W ) on the t t A= invariant mass spectrum at the Large Hadron Collider (LHC) in presence of both resonant and non-resonant Higgs boson effects. We show that corrections of O ( I- S 2 I- W ) involving a non-resonant Higgs boson are comparable to or even larger than those involving interference with the s-channel resonant Higgs boson amplitude and that both of these are subdominant with respect to all other (non-Higgs) diagrams through that order. We also compute the contribution through O ( I- S 2 I- W 2 ) of resonant Higgs boson production (i.e. Higgs production via gg fusion) as well as the pure QCD ones of O ( I- S 3 ) . Altogether, we show that the well-known peakadip structure of the M t t A= spectrum emerging from interference effects between the t , u -channel gg-induced Leading Order (LO) QCD diagrams and the one due to a Higgs boson in s-channel via gg-fusion is drastically swamped by the remainder of the terms of O ( I- S 2 I- W ) discussed above.
ISSN:0370-2693
DOI:10.1016/j.physletb.2012.04.074