5,052 research outputs found
Higher molecular pentaquarks arising from the interactions
The discoveries of the and as the potential molecules have sparked
our curiosity in exploring a novel class of molecular pentaquarks. In this study, we carry out an investigation
into the higher molecular pentaquarks, specifically focusing on the states arising from the interactions. Our approach employs the
one-boson-exchange model, incorporating both the - wave mixing effect and
the coupled channel effect. Our numerical results suggest that the states with , the
states with , the
states with , the
states with , the states
with , and the states with
can be recommended as the most promising molecular
pentaquark candidates, and there may exist the potential molecular pentaquark candidates for several isovector states. With the higher statistical data
accumulation at the LHCb's Run II and Run III status, there is the possibility
that our predicted states can be detected through
the weak decay of the baryon, especially in hunting for the predicted
states.Comment: 22 pages, 6 figures, and 10 table
New type of doubly charmed molecular pentaquarks containing most strange quarks: Mass spectra, radiative decays, and magnetic moments
In this work, we first predict the mass spectra of the
-type doubly charmed molecular pentaquark
candidates, where the one-boson-exchange model is adopted by considering both
the - wave mixing effect and the coupled channel effect. Our findings
indicate that the state with , the
state with , and the
state with can be considered as the
most promising doubly charmed molecular pentaquark candidates, and the
state with , the state
with , and the state with
are the possible doubly charmed molecular pentaquark
candidates. Furthermore, we further explore the radiative decays and the
magnetic moments of the most promising doubly charmed molecular pentaquark
candidates in the constituent quark model. As a crucial aspect of spectroscopy,
the information of the radiative decays and the magnetic moments can provide
the valuable clues to reflect their inner structures. With the accumulation of
higher statistical data at the Large Hadron Collider, we propose that the LHCb
Collaboration should focus on the problem of searching for these predicted
doubly charmed molecular pentaquark candidates containing most strange quarks
in the coming years.Comment: 16 pages, 1 figure, and 7 table
Observe matter falling into a black hole
It has been well known that in the point of view of a distant observer, all
in-falling matter to a black hole (BH) will be eventually stalled and "frozen"
just outside the event horizon of the BH, although an in-falling observer will
see the matter falling straight through the event horizon. Thus in this "frozen
star" scenario, as distant observers, we could never observe matter falling
into a BH, neither could we see any "real" BH other than primordial ones, since
all other BHs are believed to be formed by matter falling towards singularity.
Here we first obtain the exact solution for a pressureless mass shell around a
pre-existing BH. The metrics inside and interior to the shell are all different
from the Schwarzschild metric of the enclosed mass. The metric interior to the
shell can be transformed to the Schwarzschild metric for a slower clock which
is dependent of the location and mass of the shell. Another result is that
there does not exist a singularity nor event horizon in the shell. Therefore
the "frozen star" scenario is incorrect. We also show that for all practical
astrophysical settings the in-falling time recorded by an external observer is
sufficiently short that future astrophysical instruments may be able to follow
the whole process of matter falling into BHs. The distant observer could not
distinguish between a "real" BH and a "frozen star", until two such objects
merge together. It has been proposed that electromagnetic waves will be
produced when two "frozen stars" merge together, but not true when two "real"
bare BHs merge together. However gravitational waves will be produced in both
cases. Thus our solution is testable by future high sensitivity astronomical
observations.Comment: 7 pages, 2 figures. Proceeding of the conference "Astrophysics of
Compact Objects", 1-7 July, Huangshan, China. Abridged abstrac
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Exploring the Relationship between Whole vs. Part Destination Images: A Case Study
This study attempted to explore the relationship between the destination image of one region (whole destination image) and those of its inner areas (part destination images) via a core-periphery structural perspective. To date, empirical studies on this topic remain rare. By content analyzing online reviews, the relationship of memory associations in the whole and part destination images was analyzed. Our results show that whole destination image shares a number of associations with part destination images. Yet the percentages of shared image associations on whole destination image are not equal among part destination images. The status (core/periphery) of shared associations may not be the same in whole and part destination images. Besides, core associations of part destination images are more likely to be found in whole destination image compared to periphery associations of part destination images. Conceptual and managerial implications of the findings were discussed
Radiative decays and magnetic moments of the predicted -like molecules
In this work, we first perform a systematic study of the transition magnetic
moments and the corresponding radiative decay behaviors of the -like
molecular states associated with their mass spectra, where the constituent
quark model is adopted by considering the - wave mixing effect. Our
numerical results show that the radiative decay properties can be considered as
the effective physical observable to reflect the inner structures of these
-like molecular states. Meanwhile, we also discuss the magnetic moments of
the -like molecular states, and we find that the magnetic moment
properties can be used to distinguish the -like molecular states from the
conventional mesonic states, which have the same quantum numbers and
similar masses. We expect that the present study can inspire the interest of
experimentalist in exploring the electromagnetic properties of the -like
molecular states, especially the radiative decay properties.Comment: 13 pages, 8 tables, 1 figur
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