we illustrate some of the other choices as variations compared to our central value:
DESCRIPTION
We illustrate some of the other choices as variations compared to our central value:. α S (Mz) = 0.1156 → 0.1196 New H1 ‘optimized’ parametrization New ZEUS-JETS ‘optimized parametrization Old ‘in-between’ parametrization with ‘humpy’ gluon solution. OLD. NEW. HERA I PDFs. HERA I PDFs. - PowerPoint PPT PresentationTRANSCRIPT
We illustrate some of the other choices as variations
compared to our central value:
•αS(Mz) = 0.1156 → 0.1196
•New H1 ‘optimized’ parametrization
•New ZEUS-JETS ‘optimized parametrization
•Old ‘in-between’ parametrization with ‘humpy’ gluon solution
Comparison of central fit plus total uncertainties to variations with αs(Mz)=0.1156
OLD/NEW are the same apart from high-x for the sea.
STOP PRESS: the new NEW with fc=0.15 non-dynamic but Q20 and mc variation of fc, looks EXACTLy like OLD
Preliminary status
requested
HERA I PDFsHERA I PDFs
OLD NEW
Comparison of central fit plus total uncertainties to variations with αs(Mz)=0.1196
OLD/NEW are the same apart from high-x for the sea
STOP PRESS: the new NEW with fc=0.15 non-dynamic but Q20 and mc variation of fc, looks EXACTLy like OLD
NEWOLD
Comparison of central fit plus total uncertainties to parametrization variation using: New H1 optimised parametrization
Old/new are the same
Preliminary status
requested
HERA I PDFsHERA I PDFs
NEWOLD
Comparison of central fit plus total uncertainties to parametrization variation using: New H1 optimised parametrization
OLD/NEW very slightly different at high-x Dbar
STOP PRESS: the new NEW with fc=0.15 non-dynamic but Q20 and mc variation of fc, looks EXACTLy like OLD
NEWOLD
Comparison of central fit plus total uncertainties to parametrization variation using: New ZEUS-JETS optimised parametrization
OLD/NEW look the same
Preliminary status
requested
HERA I PDFsHERA I PDFs
NEWOLD
NEWOLD
Comparison of central fit plus total uncertainties to parametrization variation using: New ZEUS-JETS optimised parametrization
OLD/NEW look the same apart from very high-x Dbar
STOP PRESS: the new NEW with fc=0.15 non-dynamic but Q20 and mc variation of fc, looks EXACTLy like OLD
Comparison of central fit plus total uncertainties to parametrization variation using: the ‘humpy’solution for the h1/zeus parametrization.
At Q2=4 (right)GeV2 where the humpy structure is more visible
OLD/NEW look the same
Preliminary status
requested
NEWOLD