scholarly journals Study of top quark dipole interactions in tt¯ production associated with two heavy gauge bosons at the LHC

2018 ◽  
Vol 97 (7) ◽  
Author(s):  
Seyed Mohsen Etesami ◽  
Sara Khatibi ◽  
Mojtaba Mohammadi Najafabadi
Keyword(s):  
Top Quark ◽  
Gauge Bosons ◽  
Dipole Interactions ◽  
Heavy Gauge Bosons

New heavy gauge bosons inppandpp―collisions

1984 ◽  
Vol 30 (7) ◽  
pp. 1470-1487 ◽  
Author(s):  
Paul Langacker ◽  
Richard W. Robinett ◽  
Jonathan L. Rosner
Keyword(s):  
Gauge Bosons ◽  
Heavy Gauge Bosons

scholarly journals Top quark polarization as a probe of models with extra gauge bosons

2011 ◽  
Vol 83 (11) ◽  
Author(s):  
Edmond L. Berger ◽  
Qing-Hong Cao ◽  
Chuan-Ren Chen ◽  
Hao Zhang
Keyword(s):  
Top Quark ◽  
Gauge Bosons

Bounds on mixing between light and heavy gauge bosons

1984 ◽  
Vol 30 (9) ◽  
pp. 2008-2010 ◽  
Author(s):  
Paul Langacker
Keyword(s):  
Gauge Bosons ◽  
Heavy Gauge Bosons

scholarly journals Non-Universal Gauge Bosons Z′ and Rare Top Decays

2003 ◽  
Vol 18 (31) ◽  
pp. 2187-2193 ◽  
Author(s):  
Chongxing Yue ◽  
Hongjie Zong ◽  
Lanjun Liu
Keyword(s):  
Parameter Space ◽  
Top Quark ◽  
Branching Ratios ◽  
New Method ◽  
Gauge Bosons ◽  
Near Future

We study a new method for detecting non-universal gauge bosons Z′ via considering their effects on rare top decays. We calculate the contributions of the non-universal gauge bosons Z′ predicted by topcolor-assisted technicolor (TC2) models and flavor-universal TC2 models on the rare top decays t → cV (V = g,γ,Z) and t → clilj (li,lj = τ,μ, or e). We show that the branching ratios of these processes can be significantly enhanced. Over a sizeable region of the parameter space, we have Br (t → cg) ~ 10-5 and Br (t → cττ) ~ 10-7, which may approach the observable threshold of near future experiments. Non-universal gauge bosons Z′ may be detected via the rare top decay processes at the top-quark factories such as the CERN LHC.

PREDICTION OF THE TOP QUARK MASS IN A FINITE ELECTROWEAK THEORY

1991 ◽  
Vol 06 (29) ◽  
pp. 2697-2703
Author(s):  
M. CLAYTON ◽  
J. W. MOFFAT
Keyword(s):  
Top Quark ◽  
Quark Mass ◽  
Vacuum Polarization ◽  
Local Scale ◽  
Higgs Mechanism ◽  
Electroweak Theory ◽  
Particle Spectrum ◽  
Top Quark Mass ◽  
Gauge Bosons ◽  
Non Local

A parameter-free prediction of the top quark mass is obtained from the calculation of [Formula: see text] in a finite non-local electroweak theory, in which the W and Z gauge bosons acquire their masses through the lowest order vacuum polarization graphs containing fermion loops. The SU (2)× U (1) gauge symmetry is broken to U (1) em by a symmetry breaking measure factor in the path integral without resorting to a Higgs mechanism. Using the ratio of the W and Z masses obtained from the average of the UAI, UA2 and the CDF experiments, we predict mt=86±33 GeV and the gauge boson non-local scale Λw=523±4 GeV . Using the CDF measured W mass, we find mt=125±40 GeV and Λw=529±6 GeV . The particle spectrum in the model contains the W, Z and photon gauge bosons and the standard three generations of leptons and quarks, including the anticipated top quark.

scholarly journals Global analysis of the top quark couplings to gauge bosons

1994 ◽  
Vol 50 (7) ◽  
pp. 4462-4477 ◽  
Author(s):  
Ehab Malkawi ◽  
C.-P. Yuan
Keyword(s):  
Top Quark ◽  
Global Analysis ◽  
Gauge Bosons

scholarly journals Rare decays of the top quark mediated by Z′ gauge bosons and flavor violation

2020 ◽  
Vol 35 (18) ◽  
pp. 2050153
Author(s):  
J. I. Aranda ◽  
D. Espinosa-Gómez ◽  
J. Montaño ◽  
F. Ramírez-Zavaleta ◽  
E. S. Tututi
Keyword(s):  
Gauge Boson ◽  
Top Quark ◽  
Branching Ratios ◽  
Gauge Bosons ◽  
Flavor Violation ◽  
Gauge Symmetries ◽  
Quark Decays ◽  
The Standard Model ◽  
Order Of Magnitude ◽  
The One

The rare top quark decays mediated by a new neutral massive gauge boson that is predicted in models with extended gauge symmetries are studied. We focus on the processes [Formula: see text] induced at the one loop level, where [Formula: see text], by considering different extended models. It is found that, within a broad range of mass of the new neutral gauge boson, the models predict branching ratios for the decays in study that are competitive with respect to the corresponding branching ratios in the Standard Model (SM). In order to establish bound on our branching ratios, we consider the recent experimental bounds as [Formula: see text], depending on the model, which also impose restrictions on our calculation. Even in this case, the resulting branching ratios are of the same order of magnitude as that predicted by the SM. It should be noted that for the case of two models studied here, since no experimental bound exists to compare with, the results could be important, as they are, in the best of cases, two orders of magnitude larger than the predicted by the SM.

scholarly journals A TEST OF SU(15) AT HERA USING THE HELAS PROGRAM

2001 ◽  
Vol 16 (32) ◽  
pp. 2115-2122
Author(s):  
SUN MYONG KIM
Keyword(s):  
Cross Section ◽  
Gauge Bosons ◽  
Final State ◽  
Heavy Gauge Bosons ◽  
The Cross ◽  
Near Future

A possible SU(15) process at HERA is investigated. The process that we consider is [Formula: see text] through the exchange of new heavy gauge bosons X- and X-- which are predicted in SU(15). This process produces two easily observable like-sign muons in the final state. The cross-section of this process is calculated by using HELAS and VEGAS programs, and PDF-library functions. The cross-section turns out to be small to be observed in the near future.

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