4,247 research outputs found
The decay and its implication for the vector-like singlet fermion model
The decay width is firstly evaluated at leading order
perturbation theory in the standard model. The result suggests that it is
difficult to observe this mode because of the small width compared with other
decays of the Higgs boson. Then based on the vector-like singlet model,
assuming that the top partner only mixes with the third generation quark, we
consider the contribution from coupling of top quark to its vector-like singlet
partner. Further results show that the width of may
rise to an extent to which the LHC experiments can accesses.Comment: 21 pages, 6 figure
Quotients with respect to strongly -subgyrogroups
A topological gyrogroup is a gyrogroup endowed with a compatible topology
such that the multiplication is jointly continuous and the inverse is
continuous. In this paper, we study the quotient gyrogroups in topological
gyrogroups with respect to strongly -subgyrogroups, and prove that let be a topological gyrogroup and a closed strongly
-subgyrogroup of , then the natural homomorphism from a topological
gyrogroup to its quotient topology on is an open and continuous
mapping, and is a homogeneous -space. We also establish that for a
locally compact strongly -subgyrogroup of a topological gyrogroup ,
the natural quotient mapping of onto the quotient space is a
locally perfect mapping. This leads us to some interesting results on how
properties of depend on the properties of . Some classical results in
topological groups are generalized.Comment: 10. arXiv admin note: substantial text overlap with arXiv:2003.08843
by other authors; text overlap with arXiv:2204.02079 by other author
On the continuity of the inverse in (strongly) paratopological gyrogroups
In this paper, we consider the continuity of the inverse in (strongly)
paratopological gyrogroups. The conclusions are established as follows: (1)\,
Every pseudocompact Tychonoff strongly paratopological gyrogroup is a
topological gyrogroup; (2) Suppose that is a locally compact
strongly paratopological gyrogroup with a symmetric neighborhood base
at 0. Then is a strongly topological gyrogroup
New predictions on the mass of the light hybrid meson from QCD sum rules
We calculate the coefficients of the dimension-8 quark and gluon condensates
in the current-current correlator of light hybrid current
. With inclusion of these
higher-power corrections and updating the input parameters, we re-analyze the
mass of the light hybrid meson from Monte-Carlo based QCD sum rules.
Considering the possible violation of factorization of higher dimensional
condensates and variation of , we obtain a conservative
mass range 1.72--2.60\,GeV, which favors as a better hybrid
candidate compared with and .Comment: 12pages, 2 figures, the version appearing in JHE
Electromagnetic radiation of baryons containing two heavy quarks
The two heavy quarks in a baryon which contains two heavy quarks and a light
one, can constitute a scalar or axial vector diquark. We study electromagnetic
radiations of such baryons, (i) \Xi_{(bc)_1} -> \Xi_{(bc)_0}+\gamma, (ii)
\Xi_{(bc)_1}^* -> \Xi_{(bc)_0}+\gamma, (iii) \Xi_{(bc)_0}^{**}(1/2, l=1) ->
\Xi_{(bc)_0}+\gamma, (iv) \Xi_{(bc)_0}^{**}(3/2, l=1) -> \Xi_{(bc)_0}+\gamma
and (v) \Xi_{(bc)_0}^{**}(3/2, l=2) -> \Xi_{(bc)_0}+\gamma, where
\Xi_{(bc)_{0(1)}}, \Xi^*_{(bc)_1} are S-wave bound states of a heavy scalar or
axial vector diquark and a light quark, and \Xi_{(bc)_0}^{**}(l is bigger than
1) are P- or D-wave bound states of a heavy scalar diquark and a light quark.
Analysis indicates that these processes can be attributed into two categories
and the physical mechanisms which are responsible for them are completely
distinct. Measurements can provide a good judgment for the diquark structure
and better understanding of the physical picture.Comment: 15 pages, Late
Instanton Effects in QCD Sum Rules for the Hybrid
In this paper, we study instanton contributions to the correlator of the
hybrid current . These contributions
are then included in a QCD sum-rule analysis of the isoscalar hybrid
mass. We find a mass at 1.83 GeV for the hybrid.
However, for the hybrid, we find the sum rules are unstable. We also
study non-zero width effects, which affect the mass prediction. The mixing
effects between these two states are studied and we find QCD sum rules support
the existence of a flavor singlet hybrid with mass at around 1.9 GeV. Finally,
we study the mixing effects between hybrid and glueball currents. The mixing
between the () and the glueball causes
two states, one in the region 1.4-1.8 GeV(1.4-2.2 GeV), and the other in the
range 1.8-2.2 GeV(2.2-2.6 GeV).Comment: 12 pages, revised versio
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