scholarly journals The analytic leading color contribution to the Higgs-gluon form factor in QCD at NNLO

2021 ◽  
Vol 2021 (3) ◽  
Author(s):  
Mario Prausa ◽  
Johann Usovitsch
Keyword(s):  
Form Factor ◽  
Leading Order ◽  
Feynman Integrals

Abstract We present an analytic three-loop result for the leading color contribution to the Higgs-gluon form factor in QCD. The leading color contribution is given at next-to-next-to-leading order by the $$ {N}_c^2 $$ N c 2 -term in QCD with Nc colors. The main focus of this article lies on the evaluation of the relevant Feynman integrals with a special emphasis on the elliptic sector.

scholarly journals Strong CP violation in spin-1/2 singly charmed baryons

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Y. Ünal ◽  
Ulf-G. Meißner
Keyword(s):  
Perturbation Theory ◽  
Dipole Moment ◽  
Form Factor ◽  
Cp Violation ◽  
Mass Shell ◽  
Chiral Expansion ◽  
Renormalization Scheme ◽  
Leading Order ◽  
Chiral Perturbation ◽  
Charmed Baryons

Abstract We report on the calculation of the CP-violating form factor F3 and the corresponding electric dipole moment for charmed baryons in the spin-1/2 sector generated by the QCD θ-term. We work in the framework of covariant baryon chiral perturbation theory within the extended-on-mass-shell renormalization scheme up to next-to-leading order in the chiral expansion.

scholarly journals Exact quark-mass dependence of the Higgs-photon form factor at three loops in QCD

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Marco Niggetiedt
Keyword(s):  
Form Factor ◽  
Higgs Boson ◽  
Quark Mass ◽  
Variable Mass ◽  
High Energy ◽  
Mass Dependence ◽  
Leading Order ◽  
Energy Limit ◽  
Quark Mass Dependence

Abstract We follow up on our discussion of the exact quark-mass dependence of the Higgs-gluon form factor at three loops in QCD [1] and turn our attention to the closely related Higgs-photon form factor. Similarly to our previous work, we intend to examine the form factor for the decay of a Higgs-boson with variable mass into two photons at the three-loop level in QCD. The set of master integrals is known numerically due to prior work on the Higgs-gluon form factor and is exploited to obtain expansions around the threshold as well as in the high-energy limit. Our results may be utilised to derive the photonic decay rate of the Higgs-boson through next-to-next-to-leading order.

scholarly journals Scalar Form Factor of the Pion in the Kroll-Lee-Zumino Field Theory

2015 ◽  
Vol 2015 ◽  
pp. 1-4
Author(s):  
C. A. Dominguez ◽  
M. Loewe ◽  
M. Lushozi
Keyword(s):  
Field Theory ◽  
Form Factor ◽  
Lattice Qcd ◽  
Leading Order ◽  
Scalar Form Factor ◽  
Perturbative Calculations ◽  
Scalar Form ◽  
Rho Meson ◽  
The Masses

The renormalizable Kroll-Lee-Zumino field theory of pions and a neutral rho-meson is used to determine the scalar form factor of the pion in the space-like region at next-to-leading order. Perturbative calculations in this framework are parameter-free, as the masses and the rho-pion-pion coupling are known from experiment. Results compare favorably with lattice QCD calculations.

scholarly journals HQET form factors for Bs → Klv decays beyond leading order

2018 ◽  
Vol 175 ◽  
pp. 13025
Author(s):  
Debasish Banerjee ◽  
Mateusz Koren ◽  
Hubert Simma ◽  
Rainer Sommer
Keyword(s):  
Form Factor ◽  
Heavy Quark ◽  
Form Factors ◽  
Good Control ◽  
Effective Theory ◽  
Ratio Method ◽  
Heavy Quark Effective Theory ◽  
Leading Order ◽  
Decay Form ◽  
Static Order

We compute semi-leptonic Bs decay form factors using Heavy Quark Effective Theory on the lattice. To obtain good control of the 1 /mb expansion, one has to take into account not only the leading static order but also the terms arising at O (1/mb): kinetic, spin and current insertions. We show results for these terms calculated through the ratio method, using our prior results for the static order. After combining them with non-perturbative HQET parameters they can be continuum-extrapolated to give the QCD form factor correct up to O (1/[see formula in PDF]) corrections and without O (αs(mb)n) corrections.

scholarly journals Continuum limit of the leading-order HQET form factor in B s → K ℓν decays

2016 ◽  
Vol 757 ◽  
pp. 473-479 ◽  
Author(s):  
Felix Bahr ◽  
Debasish Banerjee ◽  
Fabio Bernardoni ◽  
Anosh Joseph ◽  
Mateusz Koren ◽  
...  
Keyword(s):  
Form Factor ◽  
Continuum Limit ◽  
Leading Order
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