6,413 research outputs found
Central-edge asymmetry as a probe of Higgs-top coupling in production at LHC
The Higgs-top coupling plays a central role in the hierarchy problem and the
vacuum stability of the Standard Model (SM). We propose a central-edge
asymmetry () to probe the CP violating Higgs-top coupling in dileptonic
channel of production at the LHC. We demonstrate that
the CP-violating Higgs-top coupling can affect the central-edge asymmetry
through distorting distribution because of the
contribution of new top charge asymmetric term. Since
distribution is frame-independent and has a good discrimination even in boosted
regime, we use the jet substructure technique to enhance the observability of
the dileptonic channel of production. We find that (1) the
significance of dileptonic channel of production can reach
for CP phase when the luminosity fb at 14 TeV LHC. (2) the central-edge asymmetry
show a good discrimination power of CP phase of
interaction, which are -40.26\%, -26.60\%, -9.47\% for , , respectively and are hardly affected by the event selections. Besides,
by performing the binned- analysis of
distribution, we find that the scalar and pseudo-scalar interactions can be
distinguished at 95\% C.L. level at 14 TeV HL-LHC.Comment: minor changes, version accepted by PL
A precise determination of the top-quark pole mass
The Principle of Maximum Conformality (PMC) provides a systematic way to
eliminate the renormalization scheme and renormalization scale uncertainties
for high-energy processes. We have observed that by applying PMC scale-setting,
one obtains comprehensive and self-consistent pQCD predictions for the
top-quark pair total cross-section and the top-quark pair forward-backward
asymmetry in agreement with the measurements at the Tevatron and LHC. As a step
forward, in the present paper, we determine the top-quark pole mass via a
detailed comparison of the top-quark pair cross-section with the measurements
at the Tevatron and LHC. The results for the top-quark pole mass are
GeV for the Tevatron with TeV,
GeV and GeV for the LHC with TeV
and TeV, respectively. Those predictions agree with the average,
GeV, obtained from various collaborations via direct
measurements. The consistency of the pQCD predictions using the PMC with all of
the collider measurements at different energies provides an important
verification of QCD.Comment: 10 pages, 6 figures. Revised version to be published in Eur.Phys.J.
Pentaquark states with the configuration in a simple model
We discuss the mass splittings for the -wave triply heavy pentaquark
states with the configuration which is a mirror
structure of . The latter configuration is related with the nature
of observed by the LHCb Collaboration. The considered pentaquark
masses are roughly estimated with a simple method. One finds that such states
are probably not narrow even if they do exist. This leaves room for molecule
interpretation for a state around the low-lying threshold of a doubly heavy
baryon and a heavy-light meson, e.g. , if it were observed. As a by
product, we conjecture that upper limits for the masses of the conventional
triply heavy baryons can be determined by the masses of the conventional doubly
heavy baryons.Comment: 19 pages, 1 figure, 10 tables; Version accepted by Eur. Phys. J.
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