scholarly journals ηandη′ transition form factors from Padé approximants

2014 ◽  
Vol 81 ◽  
pp. 05025 ◽  
Author(s):  
Pablo Sanchez-Puertas ◽  
Pere Masjuan
Keyword(s):  
Form Factors ◽  
Padé Approximants ◽  
Transition Form ◽  
Pade Approximants

scholarly journals Scalar isoscalar form factors for energies above 1 GeV

2019 ◽  
Vol 202 ◽  
pp. 06002
Author(s):  
Stefan Ropertz ◽  
Christoph Hanhart ◽  
Bastian Kubis
Keyword(s):  
Experimental Data ◽  
Scattering Amplitudes ◽  
Form Factors ◽  
Padé Approximants ◽  
High Accuracy ◽  
Data Description ◽  
Pade Approximants ◽  
Low Energies

We present a new parametrization for scattering amplitudes and form factors, which is consistent with high-accuracy dispersive representations at low energies but at the same time allows for a data description of higher mass resonances such as the f0(1500) and f0(2020). The formalism is general and thus can be applied to many decay processes. As an example we discuss the decay of $ \bar {B}_s^0 $ → J/ψππ(KK). From the amplitude fixed in a fit to the experimental data pole positions and residues are extracted via Padé approximants.

scholarly journals Virtual corrections to gg → ZH in the high-energy and large-mt limits

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Joshua Davies ◽  
Go Mishima ◽  
Matthias Steinhauser
Keyword(s):  
Cross Section ◽  
Top Quark ◽  
Form Factors ◽  
Padé Approximants ◽  
High Energy ◽  
Radius Of Convergence ◽  
Leading Order ◽  
Partonic Cross Section ◽  
Pade Approximants ◽  
Energy Expansion

AbstractWe compute the next-to-leading order virtual corrections to the partonic cross-section of the processgg → ZH, in the high-energy and large-mtlimits. We use Padé approximants to increase the radius of convergence of the high-energy expansion in$$ {m}_t^2/s $$mt2/s,$$ {m}_t^2/t $$mt2/tand$$ {m}_t^2/u $$mt2/uand show that precise results can be obtained down to energies which are fairly close to the top quark pair threshold. We present results both for the form factors and the next-to-leading order virtual cross-section.

scholarly journals Progress in the Calculation of Nucleon Transition form Factors

2016 ◽  
Vol 57 (10) ◽  
pp. 965-973 ◽  
Author(s):  
Gernot Eichmann
Keyword(s):  
Form Factors ◽  
Transition Form

scholarly journals Padé approximants for the ground-state energy of closed-shell quantum dots

1997 ◽  
Vol 56 (24) ◽  
pp. 15740-15743 ◽  
Author(s):  
Augusto Gonzalez ◽  
Bart Partoens ◽  
François M. Peeters
Keyword(s):  
Quantum Dots ◽  
Ground State Energy ◽  
Ground State ◽  
State Energy ◽  
Closed Shell ◽  
Padé Approximants ◽  
Pade Approximants
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