9,882 research outputs found
Massive vector particles tunneling from black holes influenced by the generalized uncertainty principle
This study considers the generalized uncertainty principle, which
incorporates the central idea of large extra dimensions, to investigate the
processes involved when massive spin-1 particles tunnel from Reissner-Nordstrom
and Kerr black holes under the effects of quantum gravity. For the black hole,
the quantum gravity correction decelerates the increase in temperature. Up to
, the corrected temperatures are affected by the
mass and angular momentum of the emitted vector bosons. In addition, the
temperature of the Kerr black hole becomes uneven due to rotation. When the
mass of the black hole approaches the order of the higher dimensional Planck
mass , it stops radiating and yields a black hole remnant.Comment: 17 pages. Version accepted for publication on Physics Letters
Massive vector particles tunneling from Kerr and Kerr-Newman black holes
In this paper, we investigate the Hawking radiation of massive spin-1
particles from 4-dimensional Kerr and Kerr-Newman black holes. By applying the
Hamilton-Jacobi ansatz and the WKB approximation to the field equations of the
massive bosons in Kerr and Kerr-Newman space-time, the quantum tunneling method
is successfully implemented. As a result, we obtain the tunneling rate of the
emitted vector particles and recover the standard Hawking temperature of both
the two black holes.Comment: 14 pages, Acknowledgements added and typos corrected, Version
accepted for publication in Physics Letters
Calculation of the Branching Ratio of in PQCD
The branching ratio of is re-evaluated in the PQCD approach.
In this theoretical framework all the phenomenological parameters in the
wavefunctions and Sudakov factor are priori fixed by fitting other experimental
data, and in the whole numerical computations we do not introduce any new
parameter. Our results are consistent with the upper bounds set by the Babar
and Belle measurements.Comment: 12 pages, 1 figure, version to appear in Phys. Rev.
Exploring open-charm decay mode of charmonium-like state
The newly observed exotic states are definitely not in the standard
structures, thus their existence composes a challenge to our
understanding on the fundamental principles of hadron physics. Therefore the
studies on their decay patterns which are determined by the non-perturbative
QCD will definitely shed light on the concerned physics. Generally the
four-quark states might be in a molecular state or tetraquark or their mixture.
In this work, we adopt the suggestion that is a charmonium-like
tetraquark made of a diquark and an anti-diquark. If it is true, its favorable
decay mode should be decaying into an open-charm baryon pair, since
such a transition occurs via strong interaction and is super-OZI-allowed. In
this work, we calculate the decay width of
in the framework of the quark pair creation (QPC) model. Our numerical results
on the partial width computed in the tetraquark configuration coincide with the
Belle data within a certain error tolerance.Comment: 8 pages, 4 figures, 1 table. Accepted by Eur. Phys. J.
Re-Study on the wave functions of states in LFQM and the radiative decays of
The Light-front quark model (LFQM) has been applied to calculate the
transition matrix elements of heavy hadron decays. However, it is noted that
using the traditional wave functions of the LFQM given in literature, the
theoretically determined decay constants of the obviously
contradict to the data. It implies that the wave functions must be modified.
Keeping the orthogonality among the states and fitting their decay
constants we obtain a series of the wave functions for . Based on
these wave functions and by analogy to the hydrogen atom, we suggest a modified
analytical form for the wave functions. By use of the modified
wave functions, the obtained decay constants are close to the experimental
data. Then we calculate the rates of radiative decays of . Our predictions are consistent with the experimental data on
decays within the theoretical and experimental
errors.Comment: 10 pages, 2 figures, 1 table. Typos corrected and more discussions
added. accepted for publication in Physical Review
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