5,401 research outputs found
Precise photoproduction of the charged top-pions at the LHC with forward detector acceptances
We study the photoproduction of the charged top-pion predicted by the top
triangle moose () model (a deconstructed version of the topcolor-assisted
technicolor model) via the processes at the 14 Large Hadron Collider ()
including next-to-leading order () corrections. Our results show
that the production cross sections and distributions are sensitive to the free
parameters and . Typical correction value is and does not depend much on as well as the forward
detector acceptances.Comment: 21pages, 7figures. arXiv admin note: text overlap with
arXiv:1201.4364 by other author
Light axigluon and single top production at the LHC
The light axigluon model can explain the Tevatron
forward-backward asymmetry and at the same time satisfy the constraints from
the electroweak precision measurement and the and data, which
induces the flavor changing () couplings of axigluon with the and new
quarks. We investigate the effects of these couplings on the s- and
t-channel single top productions at the and the decays , and . Our numerical
results show that the light axigluon can give significantly contributions to
single top production and the rare top decays and .Comment: 22 pages, 8 figures; references added, contributions of new quarks to
rare decay processes adde
The signatures of the new particles and at e-p colliders in the model
Considering the superior performances of the future e-p colliders, LHeC and
FCC-eh, we discuss the feasibility of detecting the extra neutral scalar
and the light gauge boson , which are predicted by the
model. Taking into account the experimental
constraints on the relevant free parameters, we consider all possible
production channels of and at e-p colliders and
further investigate their observability through the optimal channels in the
case of the beam polarization P()= -0.8. We find that the signal
significance above 5 of as well as detecting
can be achieved via
process and a 5 sensitivity of detecting can be gained
via
process at e-p colliders with appropriate parameter values and a designed
integrated luminosity. However, the signals of decays into pair of SM
particles are difficult to be detected.Comment: 22 pages, 9 figures, references added and typos are correcte
LFV couplings of the extra gauge boson Z' and leptonic decay and production of pseudoscalar mesons
Considering the constraints of the lepton flavor violating (LFV) processes
and on the LFV couplings
, in the contexts of the models, the left-right
(LR) models, the "alternative" left-right (ALR) models and the 331 models, we
investigate the contributions of the extra gauge boson to the decay rates
of the processes ,
and with and
. Our numerical results show that the maximal values of the branching
ratios for these processes are not dependent on the mass at
leader order. The extra gauge boson predicted by the models
can make the maximum value of the branching ratio
reach . All
models considered in this paper can produce significant contributions to the
process . However, the value of
is far below its corresponding experimental upper bound.Comment: 14 pages, 2 figures; matches published versio
Production of the top-pions from the higgsless--top-Higgs model at the LHC
The top-pions() predicted by extra dimensional descriptions
of the topcolor scenario have similar feature with those in four dimensional
topcolor scenario, which have large Yukawa couplings to the third generation
quarks. In the context of the higgsless--top-Higgs(HTH) model, we discuss the
production of these new particles at the CERN Large Hadron Collider(LHC) via
various suitable mechanisms (gluon-gluon fusion, bottom-bottom fusion,
gluon-bottom fusion, and the usual Drell-Yan processes) and estimate their
production rates. We find that, as long as the top-pions are not too heavy,
they can be abundantly produced at the LHC. The possible signatures of these
new particles might be detected at the LHC experiments.Comment: 18pages, 6 figures, discussions and references added, typos correcte
Associated production of the top-pions and single top at hadron colliders
In the context of topcolor assisted technicolor(TC2) models, we study the
production of the top-pions with single top quark via the
processes and ,
and discuss the possibility of detecting these new particles at Tevatron and
LHC. We find that it is very difficult to observe the signals of these
particles via these processes at Tevatron, while the neutral and charged
top-pions and can be detecting via considering
the same sign top pair event and the (or )
event at LHC, respectively.Comment: latex files,14 pages, 7 figures. Accepted for publication in Phys.
Rev.
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