5,904 research outputs found
Probing CP-violating coupling in
We investigate the possibility of probing the CP-violating
coupling in the process at the future high
luminosity colliders. Our numerical results show that the cross
section for this process can be significantly increased for the allowed CP
phase and center of mass energy. For example the cross section is about 6
times of that in the standard model (SM) for and
(see text for definition). The simulation for the signal
process and its
backgrounds shows that the signal significance can reach more than
and for
respectively, with the integrated luminosity and
. For , the signal
significance can be greater than 5 for and 3.9 for
with the CP phase . Besides
the cross section enhancement, the CP-violating coupling will
induce the forward-backward asymmetry which is absent in the SM and is
a clear signal of new CP violation. Compared with the in the Higgs
decay , the can be greatly enhanced in
the production process. For example can reach 0.5 for and . Due to the large backgrounds, the
significance of the expected can only be observed at with
and . It is
essential to trigger the single photon in the final state to separate the
bottom jets arising from scalar or vector bosons, in order to isolate the
signal from the backgrounds more efficiently.Comment: Published version. 19 pages, 11 figures, 3 tables. Discussion on the
forward-backward asymmetry is adde
Threshold Resummation Effects in Neutral Higgs Boson Production by Bottom Quark Fusion at the CERN Large Hadron Collider
We investigate the QCD effects in the production of neutral Higgs bosons via
bottom quark fusion in both the standard model and the minimal supersymmetric
standard model at the CERN Large Hadron Collider. We include the
next-to-leading order (NLO) QCD corrections (including supersymmetric QCD) and
the threshold resummation effects. We use the soft-collinear effective theory
to resum the large logarithms near threshold from soft gluon emission. Our
results show that the resummation effects can enhance the total cross sections
by about 5% compared with the NLO results.Comment: 29pages, 14 figures, version to appear in Physical Review
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