scholarly journals Determining the effective Wilson coefficient a2 in terms of BR(Bs→ηcϕ) and evaluating BR(Bs→ηcf0(980))

2017 ◽  
Vol 96 (5) ◽  
Author(s):  
Hong-Wei Ke ◽  
Xue-Qian Li
Keyword(s):  
Wilson Coefficient

Strangeness-changing nonlepton decays of the kaons, hyperons, and the Ω− particle

1982 ◽  
Vol 60 (4) ◽  
pp. 405-423 ◽  
Author(s):  
H. C. Lee ◽  
K. B. Winterbon
Keyword(s):  
Quantum Chromodynamics ◽  
Short Distance ◽  
P Wave ◽  
Radiative Corrections ◽  
Wilson Coefficient ◽  
S Wave ◽  
Perturbative Quantum Chromodynamics ◽  
Hyperon Decays ◽  
Perturbative Quantum ◽  
Nonleptonic Decays

We try to understand the strangeness changing nonleptonic decays of kaons, hyperons, and the Ω− particle in terms of the modern, renormalized weak Hamiltonian expressed as a sum of four-quark Wilson operators, including the so-called penguin operators c5O5 and c6O6 arising from gluon radiative corrections. It is found that these decays, including the long-standing s-wave/p-wave puzzle in hyperon decays, can be understood if the Wilson coefficient [Formula: see text] has a sign opposite to that obtained from short-distance perturbative quantum chromodynamics calculations and has an effective value such that [Formula: see text].

scholarly journals CoDEx: Wilson coefficient calculator connecting SMEFT to UV theory

2019 ◽  
Vol 79 (1) ◽  
Author(s):  
Supratim Das Bakshi ◽  
Joydeep Chakrabortty ◽  
Sunando Kumar Patra
Keyword(s):  
Wilson Coefficient

Order α2S contributions to the deep inelastic Wilson coefficient

1991 ◽  
Vol 272 (1-2) ◽  
pp. 127-133 ◽  
Author(s):  
W.L. van Neerven ◽  
E.B. Zijlstra
Keyword(s):  
Wilson Coefficient

LEADING NON-LOGARITHMIC CONTRIBUTION TO THE ELECTROPENGUIN DIAGRAM AND PHENOMENOLOGY OF KAON DECAYS

1990 ◽  
Vol 05 (26) ◽  
pp. 2173-2181 ◽  
Author(s):  
M. CIUCHINI ◽  
E. FRANCO ◽  
R. ONOFRIO
Keyword(s):  
Decay Rate ◽  
Effective Hamiltonian ◽  
Leading Order ◽  
Wilson Coefficient ◽  
Kaon Decays ◽  
The Real ◽  
Logarithmic Contribution ◽  
Four Flavor

The leading non-logarithmic contribution which arises in the real part of the Wilson coefficient for the electropenguin operator is re-analyzed within the four-flavor effective Hamiltonian. The ratio Γ(K+ → π+e+e−)/Γ(K+ → π0e+νe), the KL → π0e+e− decay rate and the ∆I = 1/2 rule in non-leptonic kaon decays are reconsidered by taking into account both the leading non-logarithmic contribution and the strong corrections in log (Mw/μ)2 up to the next-to-leading order. Their dependence on the QCD parameters is studied and we argue that the inclusion of the strong corrections of order log (mg/μ)2 cannot be neglected.

scholarly journals NLO gravitational quartic-in-spin interaction

2021 ◽  
Vol 2021 (1) ◽  
Author(s):  
Michèle Levi ◽  
Fei Teng
Keyword(s):  
Effective Field ◽  
Compact Objects ◽  
Spin Interaction ◽  
Wilson Coefficient ◽  
Spinning Particle ◽  
Compact Binaries ◽  
New Type ◽  
Higher Spins ◽  
First Time ◽  
Quadratic Order

Abstract In this paper we derive for the first time the complete gravitational quartic-in-spin interaction of generic compact binaries at the next-to-leading order in the post-Newtonian (PN) expansion. The derivation builds on the effective field theory for gravitating spinning objects, and its recent extensions, in which new type of worldline couplings should be considered, as well as on the extension of the effective action of a spinning particle to quadratic order in the curvature. The latter extension entails a new Wilson coefficient that appears in this sector. This work pushes the precision frontier with spins at the fifth PN (5PN) order for maximally-spinning compact objects, and at the same time informs us of the gravitational Compton scattering with higher spins.

scholarly journals Generalized elastic positivity bounds on interacting massive spin-2 theories

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Zi-Yue Wang ◽  
Cen Zhang ◽  
Shuang-Yong Zhou
Keyword(s):  
Scattering Amplitudes ◽  
Parameter Space ◽  
Cross Sections ◽  
Effective Field ◽  
Field Theories ◽  
Finite Region ◽  
Wilson Coefficient ◽  
Massive Spin ◽  
Line Theory ◽  
Kinematic Singularities

Abstract We use generalized elastic positivity bounds to constrain the parameter space of multi-field spin-2 effective field theories. These generalized bounds involve inelastic scattering amplitudes between particles with different masses, which contain kinematic singularities even in the t = 0 limit. We apply these bounds to the pseudo-linear spin-2 theory, the cycle spin-2 theory and the line spin-2 theory respectively. For the pseudo-linear theory, we exclude the remaining operators that are unconstrained by the usual elastic positivity bounds, thus excluding all the leading (or highest cutoff) interacting operators in the theory. For the cycle and line theory, our approach also provides new bounds on the Wilson coefficients previously unconstrained, bounding the parameter space in both theories to be a finite region (i.e., every Wilson coefficient being constrained from both sides). To help visualize these finite regions, we sample various cross sections of them and estimate the total volumes.

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