scholarly journals Resummed corrections to theρparameter due to a finite width of the top quark

2010 ◽  
Vol 82 (4) ◽  
Author(s):  
D. Bettinelli ◽  
J. J. van der Bij
Keyword(s):  
Top Quark ◽  
Finite Width

scholarly journals CONVOLUTION FORMULA AND FINITE W BOSON WIDTH EFFECTS IN TOP QUARK WIDTH

2008 ◽  
Vol 23 (22) ◽  
pp. 3525-3533 ◽  
Author(s):  
G. CALDERÓN ◽  
G. LÓPEZ CASTRO
Keyword(s):  
Top Quark ◽  
W Boson ◽  
Matrix Theory ◽  
Finite Width ◽  
Current Limit ◽  
Fermion Masses ◽  
Convolution Formula ◽  
Boson Resonance ◽  
Three Body ◽  
Massless Fermions

In the Standard Model, the top quark decay width Γt is computed from the exclusive t → bW decay. We argue in favor of using the three body decays [Formula: see text] to compute Γt as a sum over these exclusive modes. As dictated by the S-matrix theory, these three body decays of the top quark involve only asymptotic states and incorporate the width of the W boson resonance in a natural way. The convolution formula commonly used to include the finite width effects is found to be valid, in the general case, when the intermediate resonance couples to a conserved current (limit of massless fermions in the case of W bosons). The relation Γt = Γ(t → bW) is recovered by taking the limit of massless fermions followed by the W boson narrow width approximation. Although both calculations of Γt are different at the formal level, their results would differ only by tiny effects induced by light fermion masses and higher-order radiative corrections.

scholarly journals Finite width effects in top quark decays

1995 ◽  
Vol 347 (3-4) ◽  
pp. 394-398 ◽  
Author(s):  
Gregory Mahlon ◽  
Stephen Parke
Keyword(s):  
Top Quark ◽  
Finite Width ◽  
Quark Decays

scholarly journals Electroweak and finite width corrections to top quark decays into transverse and longitudinalWbosons

2003 ◽  
Vol 67 (9) ◽  
Author(s):  
H. S. Do ◽  
S. Groote ◽  
J. G. Körner ◽  
M. C. Mauser
Keyword(s):  
Top Quark ◽  
Finite Width ◽  
Quark Decays

CP-ODD PHENOMENA DUE TO FINITE WIDTH EFFECTS OF THE TOP QUARK

1991 ◽  
Vol 06 (21) ◽  
pp. 1933-1942 ◽  
Author(s):  
MAREK NOWAKOWSKI ◽  
APOSTOLOS PILAFTSIS
Keyword(s):  
Standard Model ◽  
Top Quark ◽  
Quark Mass ◽  
Quark Propagator ◽  
Upper Bounds ◽  
Coupling Constants ◽  
Charged Current ◽  
Finite Width ◽  
Top Quark Mass ◽  
The Standard Model

Strong experimental indications exist that the top quark mass in the Standard Model (SM) exceeds the mass of the W gauge boson. Since this opens the decay mode t → Wb a suitable regularization of the top quark propagator in the s-channel is required in many tree reactions. As in the Z0 case this regularization essentially results in an. additional imaginary contribution (iΓtmt) to the propagator. This absorptive phase can combine with complex coupling constants of the charged current sector to give rise to new CP violating effects. Theoretical upper bounds for the size of these CP-odd signals are estimated in various extensions of the SM such as: the four generation SM, left-right symmetric models and models with two or three Higgs doublets.

Top Quark Results at the Tevatron

2009 ◽  
Author(s):  
Ernest Aguiló
Keyword(s):  
Top Quark

Dispersion Characteristics of Multi-Step Open Slow-Wave Systems of Finite Width: Analysis

1997 ◽  
Vol 51 (8) ◽  
pp. 77-84
Author(s):  
L. M. Buzik ◽  
O. F. Pishko ◽  
S.A. Churilova ◽  
O. I. Sheremet
Keyword(s):  
Slow Wave ◽  
Finite Width ◽  
Dispersion Characteristics
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