Strong Couplings from Weak Decays of Pseudoscalar Mesons

1969 ◽  
Vol 184 (5) ◽  
pp. 1782-1787 ◽  
Author(s):  
Marcel Wellner
Keyword(s):  
Weak Decays ◽  
Pseudoscalar Mesons

scholarly journals Contributions from $${\Phi }_{B2}$$ to the B $${\rightarrow }$$ PP decays within the QCD factorization

2019 ◽  
Vol 79 (12) ◽  
Author(s):  
Qin Chang ◽  
Lili Chen ◽  
Yunyun Zhang ◽  
Junfeng Sun ◽  
Yueling Yang
Keyword(s):  
Theoretical Calculation ◽  
Measurement Precision ◽  
Distribution Amplitude ◽  
Factorization Approach ◽  
Weak Decays ◽  
Qcd Factorization ◽  
Pseudoscalar Mesons

AbstractWith the potential for the improvements of measurement precision, the refinement of theoretical calculation on hadronic B weak decays is necessary. In this paper, we study the contributions of B mesonic distribution amplitude $${\Phi }_{B2}$$ΦB2 within the QCD factorization approach, and find that $${\Phi }_{B2}$$ΦB2 contributes to only the nonfactorizable annihilation amplitudes for the B$${\rightarrow }$$→PP decays (P denotes the ground SU(3) pseudoscalar mesons). Although small, the $${\Phi }_{B2}$$ΦB2 contributions might be helpful for improving the performance of the QCD factorization approach, especially for the pure annihilation $$B_{d}$$Bd$${\rightarrow }$$→$$K^{+}K^{-}$$K+K- and $$B_{s}$$Bs$${\rightarrow }$$→$${\pi }^{+}{\pi }^{-}$$π+π- decays.

RADIATIVE WEAK DECAYS OF PSEUDOSCALAR MESONS IN THE CHARM-SECTOR

1995 ◽  
Vol 10 (02) ◽  
pp. 103-114 ◽  
Author(s):  
N. BARIK ◽  
P. C. DASH
Keyword(s):  
Quark Model ◽  
Branching Ratios ◽  
Weak Decays ◽  
Pseudoscalar Mesons ◽  
Static Calculation

Radiative weak decays such as [Formula: see text] and [Formula: see text] have been investigated in a relativistic independent quark model. The branching ratios of such decays estimated in a 'static' calculation are found to be [Formula: see text], [Formula: see text].

THEORETICAL IDEAS ON HEAVY FLAVOUR WEAK DECAYS

1982 ◽  
Vol 43 (C3) ◽  
pp. C3-631-C3-657 ◽  
Author(s):  
L. Maiani
Keyword(s):  
Weak Decays

scholarly journals The low-energy effective theory of axions and ALPs

2021 ◽  
Vol 2021 (4) ◽  
Author(s):  
Martin Bauer ◽  
Matthias Neubert ◽  
Sophie Renner ◽  
Marvin Schnubel ◽  
Andrea Thamm
Keyword(s):  
High Energy ◽  
New Physics ◽  
Mass Scale ◽  
Low Energy ◽  
Effective Theory ◽  
Loop Order ◽  
Flavor Changing ◽  
Effective Lagrangian ◽  
Anomalous Dimensions ◽  
Pseudoscalar Mesons

Abstract Axions and axion-like particles (ALPs) are well-motivated low-energy relics of high-energy extensions of the Standard Model, which interact with the known particles through higher-dimensional operators suppressed by the mass scale Λ of the new-physics sector. Starting from the most general dimension-5 interactions, we discuss in detail the evolution of the ALP couplings from the new-physics scale to energies at and below the scale of electroweak symmetry breaking. We derive the relevant anomalous dimensions at two-loop order in gauge couplings and one-loop order in Yukawa interactions, carefully considering the treatment of a redundant operator involving an ALP coupling to the Higgs current. We account for one-loop (and partially two-loop) matching contributions at the weak scale, including in particular flavor-changing effects. The relations between different equivalent forms of the effective Lagrangian are discussed in detail. We also construct the effective chiral Lagrangian for an ALP interacting with photons and light pseudoscalar mesons, pointing out important differences with the corresponding Lagrangian for the QCD axion.

INDICATIONS OF A ΔI=1/2 RULE IN THE STRONG COUPLING REGIME

1988 ◽  
Vol 03 (06) ◽  
pp. 1385-1412
Author(s):  
IAN G. ANGUS
Keyword(s):  
Lattice Qcd ◽  
Strong Coupling ◽  
Computer Algebra ◽  
Free Parameter ◽  
Hamiltonian Formalism ◽  
Strong Coupling Expansion ◽  
Calculation Scheme ◽  
Strong Coupling Regime ◽  
Weak Decays ◽  
The One

We will attempt to understand the ΔI=1/2 pattern of the nonleptonic weak decays of the kaons. The calculation scheme employed is the Strong Coupling Expansion of lattice QCD. Kogut-Susskind fermions are used in the Hamiltonian formalism. We will describe in detail the methods used to expedite this calculation, all of which was done by computer algebra. The final result is very encouraging. Even though an exact interpretation is clouded by the presence of irrelevant operators, and questions of lattice artifacts, a signal of the ΔI=1/2 rule appears to be observable. With an appropriate choice of the one free parameter, enhancements greater than those observed experimentally can be obtained. We also point out a number of surprising results which we turn up in the course of the calculation.

Heavy-flavor-conserving nonleptonic weak decays of heavy baryons

1992 ◽  
Vol 46 (11) ◽  
pp. 5060-5068 ◽  
Author(s):  
Hai-Yang Cheng ◽  
Chi-Yee Cheung ◽  
Guey-Lin Lin ◽  
Y. C. Lin ◽  
Tung-Mow Yan ◽  
...  
Keyword(s):  
Heavy Flavor ◽  
Weak Decays ◽  
Heavy Baryons
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