This document is posted to help you gain knowledge. Please leave a comment to let me know what you think about it! Share it to your friends and learn new things together.
(Br tables of HNNLO seem to be computed from Hdecay)
7
Motivations:
-take into consideration acceptance of detector and change of ecmneed angular and pT distributions of photons
-Higgs pT is a powerful discriminating variable, need good knowledge of distributions especially at low pT where resummation is important to avoid fixed order Monte Carlo behavior
differential x-sections
8
differential x-sections with HNNLO
gg fusion Higgs 2 photons γ
LO _ pT34 pT3 &pT4
y34 η3 & η4
NLO pT5 pT34 pT3 &pT4
y34 η3 & η4
NNLO pT5 pT34 pT3 & pT4
pT6 y34 η3 & η4
1
2
H3
4
5 (jet)
6 (jet)
)(
d
d
For high masses, the photon is more central
9
mH=100 GeVstable observable / pert order
mH=100 GeV mH=800 GeVphoton
normalized:ATL-COM-PHYS-2009-161 Qian, Liu,
Mansoulie, Purdham, Strandberg, Thun
)(
Tdp
dmH=100 GeV
fixed order calculation :LO bounded at pt=mH/2 NLO and NNLO unstables in this region
10
photon
normalized: ATL-COM-PHYS-2009-161
)(Hdy
d
mH=100 GeV mH=800 GeV
Detector acceptance will limit the rapidity range that can be measured11