scholarly journals Calculations of Long-Distance Effects on Neutral K Meson Mixing with Chiral Lagrangian

1990 ◽  
Vol 84 (4) ◽  
pp. 658-674
Author(s):  
T. Kurimoto
Keyword(s):  
Long Distance ◽  
K Meson ◽  
Distance Effects ◽  
Meson Mixing ◽  
Chiral Lagrangian

scholarly journals NONFACTORIZABLE CONTRIBUTIONS IN NONLEPTONIC WEAK INTERACTIONS OF K MESONS

2001 ◽  
Vol 16 (09) ◽  
pp. 1605-1630 ◽  
Author(s):  
K. TERASAKI
Keyword(s):  
Short Distance ◽  
Weak Interactions ◽  
Mass Difference ◽  
Long Distance ◽  
Field Algebra ◽  
K Meson ◽  
Distance Effects ◽  
Intermediate States ◽  
Meson Pole ◽  
Existing Data

K→ππ, KL-KS mass difference (Δ mK) and KL→γγ(*) are studied systematically by decomposing their amplitude into a sum of factorizable and nonfactorizable ones. The former is calculated by using the naive factorization while the latter is assumed to be controlled by hadron dynamics. Nonfactorizable amplitudes for the K→ππ decays which are estimated by using a hard pion technique dominates the |ΔI| = ½ amplitude. It is seen that the naively factorized short distance term dominates ΔmK as usual since contributions of pseudoscalar-meson poles and ππ intermediate states as the nonfactorizable long distance effects interfere destructively with each other. The K*-meson pole survives in the KL→γγ decay and plays an important role in the present perspective in contrast with the existing theories which are restricted by the theory of field algebra. The form factor for the Dalitz decays of KL and their rates are compared with the existing data.

Including long-distance effects in theKL−KSmass splitting

1990 ◽  
Vol 42 (1) ◽  
pp. 118-125 ◽  
Author(s):  
B. Machet ◽  
N. F. Nasrallah ◽  
K. Schilcher
Keyword(s):  
Long Distance ◽  
Distance Effects

scholarly journals Searching for new physics in charm radiative decays

2018 ◽  
Vol 33 (32) ◽  
pp. 1850194
Author(s):  
Aritra Biswas ◽  
Sanjoy Mandal ◽  
Nita Sinha
Keyword(s):  
Standard Model ◽  
Branching Ratio ◽  
New Physics ◽  
Radiative Decays ◽  
Symmetric Model ◽  
Leading Order ◽  
Photon Polarization ◽  
Long Distance ◽  
The Standard Model ◽  
Distance Effects

We show that for a heavy vector-like quark model with a down type isosinglet, branching ratio for [Formula: see text] decay is enhanced by more than [Formula: see text] as compared to that in the Standard model when QCD corrections to next-to-leading order are incorporated. In a left–right symmetric model (LRSM) along with a heavy vector-like fermion, enhancement of this order can be achieved at the bare (QCD uncorrected) level itself. We propose that a measurement of the photon polarization could be used to signal the presence of such new physics in spite of the large long distance effects. We find that there is a large region within the allowed parameter space of the model with a vector-like quark and an additional left–right symmetry, where, the photon polarization can be dominantly right-handed.

scholarly journals Short and long distance effects in the decay τ → πντ(γ)

1995 ◽  
Vol 438 (1-2) ◽  
pp. 17-53 ◽  
Author(s):  
Roger Decker ◽  
Markus Finkemeier
Keyword(s):  
Long Distance ◽  
Distance Effects

PARAMETER OF K MESON MIXING AND NON-ABELIAN ANOMALY

1992 ◽  
Vol 07 (27) ◽  
pp. 6833-6844 ◽  
Author(s):  
V.M. BELYAEV
Keyword(s):  
General Consideration ◽  
Matrix Elements ◽  
K Meson ◽  
Meson Mixing ◽  
Good Agreement

The amplitude of K meson mixing is calculated. Pseudo-Goldstone fields are considered as phases of γ5 transformation of quark fields. A formalism for description of K and π mesons in this approach is given. The amplitude is expressed in terms of matrix elements [Formula: see text] and [Formula: see text]. It is shown that there is a relation between [Formula: see text] and [Formula: see text]. This relation is in good agreement with known values for amplitudes. The result for the parameter of K meson mixing is [Formula: see text]. From general consideration it is shown that the correction to the vacuum factorization hypothesis must be positive.

REVISITING THE POSSIBILITY OF NEW PHYSICS IN THE $K\hbox{--}\bar{K}$ AND $B_d\hbox{--}\bar{B}_d$ SYSTEMS

2012 ◽  
Vol 27 (22) ◽  
pp. 1250125 ◽  
Author(s):  
GULSHEEN AHUJA ◽  
ROHIT VERMA ◽  
PRIYANKA FAKAY ◽  
P. S. GILL ◽  
MANMOHAN GUPTA
Keyword(s):  
Lattice Qcd ◽  
Percent Level ◽  
New Physics ◽  
Long Distance ◽  
Distance Effects

Recently several developments have taken place in the lattice QCD calculations of hadronic factors in the case of [Formula: see text] and the [Formula: see text] mixings along with contribution of the long distance effects in the [Formula: see text] system. These have led some authors (Refs. 12 and 13) to point towards the possibility of New Physics (NP) in these systems to the tune of 20% or so. However, the present analysis, based on essentially NP free inputs and incorporating constraints of unitarity, shows that in case the NP effects are there in the parameters associated with these systems, e.g. sin 2β, Vtd, ϵK, etc., these seem to be only at a few percent level.

Long distance effects in non-leptonicK decays revisited

1988 ◽  
Vol 41 (2) ◽  
pp. 327-331 ◽  
Author(s):  
T. N. Pham ◽  
D. G. Sutherland
Keyword(s):  
Long Distance ◽  
Distance Effects
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