scholarly journals CPviolation in the partial width asymmetries forB−→π+π−K−andB−→K+K−K−decays

2004 ◽  
Vol 70 (3) ◽  
Author(s):  
S. Fajfer ◽  
T. N. Pham ◽  
A. Prapotnik
Keyword(s):  
Partial Width

ONE-LOOP RADIATIVE CORRECTIONS TO A HEAVY TOP DECAY IN THE STANDARD MODEL

1991 ◽  
Vol 06 (27) ◽  
pp. 4925-4948 ◽  
Author(s):  
JIANG LIU ◽  
YORK-PENG YAO
Keyword(s):  
Top Quark ◽  
Asymmetry Parameter ◽  
Partial Width ◽  
Angular Distributions ◽  
Radiative Corrections ◽  
Inclusive Process ◽  
The Standard Model ◽  
Top Quark Decay ◽  
Quark Decay ◽  
Exclusive Or

We study one-loop radiative corrections to the top-quark decay: t→bW. For a heavy top (i.e. mt≳100 GeV ), simple analytic formulas are derived. For the inclusive process, t→bW+X due to QCD, cancellations of infrared and mass singularities are shown explicitly. The final result agrees with an earlier calculation in the literature, and is an 8% reduction in the partial width for αs=0.1. Also, leading terms of the electroweak corrections are shown to be proportional to an enhancement factor [Formula: see text]. Their effect is about 1-3%. We also study the angular distributions of the leptons from the subsequent exclusive (or semi-inclusive) W decay. An asymmetry parameter which measures the polarizations of the W is introduced. We find that it is sensitive to the QCD corrections especially in the vicinity of [Formula: see text].

scholarly journals Enhanced $\Gamma(p\to K^0\mu^+)/\Gamma(p\to K^+\bar{\nu}_\mu)$ as a signature of minimal renormalizable SUSY SO (10) GUT

2020 ◽  
Vol 2020 (9) ◽  
Author(s):  
Naoyuki Haba ◽  
Yukihiro Mimura ◽  
Toshifumi Yamada
Keyword(s):  
Partial Width ◽  
Width Ratio ◽  
Detailed Knowledge ◽  
Main Body ◽  
Grand Unified Theory ◽  
Plausible Assumption ◽  
Decay Modes ◽  
Yukawa Couplings ◽  
2Nd Generation ◽  
Left Handed

Abstract The ratio of the partial widths of some dimension-5 proton decay modes can be predicted without detailed knowledge of supersymmetric (SUSY) particle masses, and this allows us to experimentally test various SUSY grand unified theory (GUT) models without discovering SUSY particles. In this paper, we study the ratio of the partial widths of the $p\to K^0\mu^+$ and $p\to K^+\bar{\nu}_\mu$ decays in the minimal renormalizable SUSY $SO(10)$ GUT, under only a plausible assumption that the 1st- and 2nd-generation left-handed squarks are mass-degenerate. In the model, we expect that the Wilson coefficients of dimension-5 operators responsible for these modes are on the same order and that the ratio of $p\to K^0\mu^+$ and $p\to K^+\bar{\nu}_\mu$ partial widths is $O(0.1)$. Hence, we may be able to detect both $p\to K^0\mu^+$ and $p\to K^+\bar{\nu}_\mu$ decays at Hyper-Kamiokande, thereby gaining a hint for the minimal renormalizable SUSY $SO(10)$ GUT. Moreover, since this partial width ratio is quite suppressed in the minimal $SU(5)$ GUT, it allows us to distinguish the minimal renormalizable SUSY $SO(10)$ GUT from the minimal $SU(5)$ GUT. In the main body of the paper, we perform a fitting of the quark and lepton masses and flavor mixings with the Yukawa couplings of the minimal renormalizable $SO(10)$ GUT, and derive a concrete prediction for the partial width ratio based on the fitting results. We find that the partial width ratio generally varies in the range $0.05$–$0.6$, confirming the above expectation.

scholarly journals Measurement of the partial width of the decay of the Z0 into charm quark pairs

1990 ◽  
Vol 252 (1) ◽  
pp. 140-148 ◽  
Author(s):  
P. Abreu ◽  
W. Adam ◽  
F. Adami ◽  
T. Adye ◽  
G.D. Alekseev ◽  
...  
Keyword(s):  
Charm Quark ◽  
Partial Width ◽  
Quark Pairs

Mesures de vies moyennes dans 12B, 14N et 16O

1970 ◽  
Vol 48 (13) ◽  
pp. 1595-1606 ◽  
Author(s):  
A. Gallmann ◽  
F. Haas ◽  
N. Balaux ◽  
B. Heusch ◽  
M. Toulemonde
Keyword(s):  
Wave Function ◽  
Doppler Shift ◽  
Partial Width ◽  
Transition Energies ◽  
Radiative Transitions ◽  
Upper Limits ◽  
Doppler Shift Attenuation ◽  
Theoretical Predictions ◽  
Doppler Shift Attenuation Method ◽  
Gamma Radiations

Lifetimes of nuclear states have been measured by the Doppler-shift attenuation method. Gamma radiations from the 11B(d,pγ)12B, 19F(p,αγ)16O, and 12C(h,pγ)14N reactions were observed with a Ge(Li) detector at θγ = 7°, 90° and 173°. The following lifetimes were obtained:[Formula: see text]Upper limits have been set for very fast lifetimes, and transition energies were also determined. The partial widths of the radiative transitions from the 6.44 MeV state of 14N were compared with theoretical predictions. The amplitude of a (p3/2)−2 configuration in the wave function of this level was evaluated using the partial width of the 6.44 → 3.95 MeV transition determined in the present work.

scholarly journals The upper limit of the e+e− partial width of X(3872)

2004 ◽  
Vol 579 (1-2) ◽  
pp. 74-78 ◽  
Author(s):  
C.Z Yuan ◽  
X.H Mo ◽  
P Wang
Keyword(s):  
Partial Width ◽  
Upper Limit

scholarly journals A Partial Width Calculation of OZI-Allowed Charmonium Decays in a Coupled Channel Framework

2009 ◽  
Vol 46 (3) ◽  
pp. 189-198 ◽  
Author(s):  
M. Sakai ◽  
Y. Matsuda ◽  
M. Hirano ◽  
K. Katō
Keyword(s):  
Partial Width ◽  
Coupled Channel
Sign in / Sign up

Export Citation Format

Share Document