scholarly journals QCD radiative corrections to the leptonic decay rate of theBcmeson

1995 ◽  
Vol 52 (1) ◽  
pp. 181-185 ◽  
Author(s):  
Eric Braaten ◽  
Sean Fleming
Keyword(s):  
Decay Rate ◽  
Leptonic Decay ◽  
Radiative Corrections

scholarly journals QED RADIATIVE CORRECTIONS TO THE DECAY π0→e+e−

1993 ◽  
Vol 08 (18) ◽  
pp. 1691-1700 ◽  
Author(s):  
GEORGE TRIANTAPHYLLOU
Keyword(s):  
Perturbation Theory ◽  
Decay Rate ◽  
Invariant Mass ◽  
New Physics ◽  
Radiative Corrections ◽  
First Order ◽  
Recent Interest ◽  
Electron Positron ◽  
Electron Positron Pair ◽  
First Order Perturbation

In view of the recent interest in the decays of mesons into a pair of light leptons, a computation of the QED radiative corrections to the decay of π0 into an electron-positron pair is presented here. The analysis is based on the soft-photon resummation method, which, unlike first-order perturbation theory, allows for very strict invariant-mass cuts on the final electrons. When combined with the theoretical estimates for the non-radiatively corrected decay rate, the results of the present paper could help to determine if new physics affect this decay.

scholarly journals Hyperfine Splitting and Leptonic Decay Rates in Heavy Quarkonia

2003 ◽  
Vol 18 (23) ◽  
pp. 1597-1600 ◽  
Author(s):  
D. Ebert ◽  
R. N. Faustov ◽  
V. O. Galkin
Keyword(s):  
Experimental Data ◽  
Hyperfine Splitting ◽  
Belle Collaboration ◽  
Leptonic Decay ◽  
Decay Rates ◽  
Heavy Quarkonia ◽  
Radiative Corrections

The hyperfine splitting in heavy quarkonia is considered in its relation to the leptonic decay rates with the account of relativistic and radiative corrections. The calculated decay rates agree well with the available experimental data, while the predicted ηc(2S) mass is significantly smaller than the value measured recently by the Belle collaboration.

On the radiative corrections α2 ln α to the positronium decay rate

1990 ◽  
Vol 246 (3-4) ◽  
pp. 520-522 ◽  
Author(s):  
I.B. Khriplovich ◽  
A.S. Yelkhovsky
Keyword(s):  
Decay Rate ◽  
Radiative Corrections ◽  
Positronium Decay

scholarly journals Radiative corrections to the light muonic atoms decay rate

1997 ◽  
Vol 235 (4) ◽  
pp. 375-378 ◽  
Author(s):  
Savely G. Karshenboim ◽  
Vladimir G. Ivanov
Keyword(s):  
Decay Rate ◽  
Radiative Corrections ◽  
Muonic Atoms

scholarly journals False vacuum decay in quantum mechanics and four dimensional scalar field theory

2018 ◽  
Vol 177 ◽  
pp. 09001 ◽  
Author(s):  
Maxim Bezuglov
Keyword(s):  
Field Theory ◽  
Quantum Field Theory ◽  
Quantum Mechanics ◽  
Green Function ◽  
Decay Rate ◽  
Radiative Corrections ◽  
Thin Wall ◽  
Quantum Field ◽  
False Vacuum ◽  
Vacuum Decay

When the Higgs boson was discovered in 2012 it was realized that electroweak vacuum may suffer a possible metastability on the Planck scale and can eventually decay. To understand this problem it is important to have reliable predictions for the vacuum decay rate within the framework of quantum field theory. For now, it can only be done at one loop level, which is apparently is not enough. The aim of this work is to develop a technique for the calculation of two and higher order radiative corrections to the false vacuum decay rate in the framework of four dimensional scalar quantum field theory and then apply it to the case of the Standard Model. To achieve this goal, we first start from the case of d=1 dimensional QFT i.e. quantum mechanics. We show that for some potentials two and three loop corrections can be very important and must be taken into account. Next, we use quantum mechanical example as a template for the general d=4 dimensional theory. In it we are concentrating on the calculations of bounce solution and corresponding Green function in so called thin wall approximation. The obtained Green function is then used as a main ingredient for the calculation of two loop radiative corrections to the false vacuum decay rate.

scholarly journals Effect of Magnetic Fields on Charged B Meson Decays

2020 ◽  
Vol 8 (1) ◽  
pp. 79-83
Author(s):  
Sukadev Sahoo ◽  
M. Kumar
Keyword(s):  
Magnetic Field ◽  
Magnetic Fields ◽  
Decay Rate ◽  
B Meson ◽  
Leptonic Decay ◽  
B Meson Decays ◽  
Meson Decays ◽  
Charged B Meson

The effect of magnetic fields on the leptonic decay of charged B meson B− → l-v- is investigated. The decay rate of the process is calculated both in the absence and presence of magnetic field. The non-perturbative parameters fB± (B), f'B± and MB±(B) are also estimated.

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