scholarly journals Low-energy constants from ALEPH hadronic tau decay data

2016 ◽  
Author(s):  
Maarten Golterman ◽  
Diogo Boito ◽  
Anthony Francis ◽  
Renwick Hudspith ◽  
Randy Lewis ◽  
...  
Keyword(s):  
Low Energy ◽  
Decay Data ◽  
Hadronic Tau ◽  
Energy Constants

scholarly journals Higgs compositeness in Sp(2N) gauge theories – Determining the low-energy constants with lattice calculations

2018 ◽  
Vol 175 ◽  
pp. 08011 ◽  
Author(s):  
Ed Bennett ◽  
Deog Ki Hong ◽  
Jong-Wan Lee ◽  
C.-J. David Lin ◽  
Biagio Lucini ◽  
...  
Keyword(s):  
Field Theory ◽  
Effective Field Theory ◽  
Effective Field ◽  
Higgs Model ◽  
Low Energy ◽  
Dirac Fermion ◽  
Global Symmetry ◽  
Composite Higgs ◽  
Lattice Calculations ◽  
Energy Constants

As a first step towards a quantitative understanding of the SU(4)/Sp(4) composite Higgs model through lattice calculations, we discuss the low energy effective field theory resulting from the SU(4) → Sp(4) global symmetry breaking pattern. We then consider an Sp(4) gauge theory with two Dirac fermion flavours in the fundamental representation on a lattice, which provides a concrete example of the microscopic realisation of the SU(4)/Sp(4) composite Higgs model. For this system, we outline a programme of numerical simulations aiming at the determination of the low-energy constants of the effective field theory and we test the method on the quenched theory. We also report early results from dynamical simulations, focussing on the phase structure of the lattice theory and a calculation of the lowest-lying meson spectrum at coarse lattice spacing.

scholarly journals New method for fitting the low-energy constants in chiral perturbation theory

2020 ◽  
Vol 102 (9) ◽  
Author(s):  
Qin-He Yang ◽  
Wei Guo ◽  
Feng-Jun Ge ◽  
Bo Huang ◽  
Hao Liu ◽  
...  
Keyword(s):  
Perturbation Theory ◽  
Chiral Perturbation Theory ◽  
Low Energy ◽  
New Method ◽  
Chiral Perturbation ◽  
Energy Constants

scholarly journals Mesonic Low-Energy Constants

2014 ◽  
Vol 64 (1) ◽  
pp. 149-174 ◽  
Author(s):  
Johan Bijnens ◽  
Gerhard Ecker
Keyword(s):  
Low Energy ◽  
Energy Constants

scholarly journals Chiral extrapolation and determination of low-energy constants from lattice data

2010 ◽  
Vol 692 (3) ◽  
pp. 184-188 ◽  
Author(s):  
G. Ecker ◽  
P. Masjuan ◽  
H. Neufeld
Keyword(s):  
Low Energy ◽  
Lattice Data ◽  
Chiral Extrapolation ◽  
Energy Constants

PION PHOTOPRODUCTION IN A GAUGE-INVARIANT CHIRAL UNITARY FRAMEWORK

2014 ◽  
Vol 26 ◽  
pp. 1460075
Author(s):  
MAXIM MAI ◽  
PETER C. BRUNS ◽  
ULF-G. MEIßNER
Keyword(s):  
Magnetic Moments ◽  
Pion Photoproduction ◽  
Low Energy ◽  
Leading Order ◽  
S Wave ◽  
Gauge Invariant ◽  
Unitary Extension ◽  
Pion Nucleon ◽  
Energy Constants ◽  
Order Contact

We investigate pion photoproduction off the proton in a manifestly gauge-invariant chiral unitary extension of chiral perturbation theory. In a first step, we consider meson-baryon scattering taking into account all next-to-leading order contact interactions. The resulting low-energy constants are determined by a fit to s-wave pion-nucleon scattering and the low-energy data for the reaction π-p → ηn. Having determined the low-energy constants, we then analyse the data on the s-wave multipole amplitudes E0+ of pion and eta photoproduction. These are parameter-free predictions, as the two new low-energy constants are determined by the neutron and proton magnetic moments.

scholarly journals Aspects of the low-energy constants in the chiral Lagrangian for charmed mesons

2016 ◽  
Vol 94 (9) ◽  
Author(s):  
Meng-Lin Du ◽  
Feng-Kun Guo ◽  
Ulf-G. Meißner ◽  
De-Liang Yao
Keyword(s):  
Low Energy ◽  
Charmed Mesons ◽  
Energy Constants ◽  
Chiral Lagrangian
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