1,219 research outputs found
The - and -wave fully charmed tetraquark states and their radial excitations
Inspired by recent progresses in observations of the fully charmed tetraquark
states by LHCb, CMS, and ATLAS Collaborations, we perform a systematic study of
the ground states and the first radial excitations of the - and -wave
system. Their mass spectra, root
mean square(r.m.s.) radii and radial density distributions are studied with the
relativized quark model. The calculations show that there is no stable bound
states for the full-charmed tetraquark states, and the r.m.s. radii of these
tetraquark states are smaller than 1 fm. Our results support assigning X(6600)
structure, MeV, as one of the (1) and
(1) states or their mixtures. Another structure also named as
X(6600) by CMS Collaboration, GeV,
may arise from the lowest 1 states with =, , and
. The possible assignments for X(6900) include the (2),
(2) states, and the highest 1 state with . As for
X(7200), it can be interpreted as one of the highest 2 states with
, , and , and the 3 states can not be
completely excluded from the candidates.Comment: to be published in European Physical Journal
Systematic analysis of doubly charmed baryons and
In this work, we perform a systematic study of the mass spectra, the root
mean square(r.m.s.) radii and the radial density distributions of the doubly
charmed baryons and . The calculations are carried out
in the frame work of Godfrey-Isgur (GI) relativized quark model, where the
baryon is regarded as a real three-body system of quarks. Our results show that
the excited energy of doubly charmed baryon with -mode is lower than
those of the -mode and - mixing mode, which indicates
that the lowest state is dominated by the -mode. According to this
conclusion, we systematically investigate the mass spectra, the r.m.s. radii of
the ground and excited states(, , ,
and ) with -mode. Using the wave functions obtained from quark
model, we also study the radial density distributions. Finally, with the
predicated mass spectra, the Regge trajectories of and
in the (,) plane are constructed, and the slopes, intercepts are
determined by linear fitting. It is found that model predicted masses fit
nicely to the constructed Regge trajectories.Comment: arXiv admin note: text overlap with arXiv:2206.0812
Strong decay properties of single heavy baryons , and
Motivated by recent progresses in experiments in searching for the
baryons, we systematically analyze the strong decay behaviors of
single heavy baryons , and . The two-body
strong decay properties of -wave, -wave and some -wave states are
studied with the model. The results support assigning the recently
observed and as the 2S()
and 1D() states, respectively. In addition, the quantum
numbers of many other experimentally observed baryons are also suggested
according to their strong decays. Finally, some baryons which have good
potentials to be observed in experiments are predicted and the possible decay
channels for searching for these predicted states are also suggested.Comment: arXiv admin note: substantial text overlap with arXiv:2206.0812
MicroRNAs in Human Pituitary Adenomas
MicroRNAs (miRNAs) are a class of recently identified noncoding RNAs that regulate gene expression at posttranscriptional level. Due to the large number of genes regulated by miRNAs, miRNAs play important roles in many cellular processes. Emerging evidence indicates that miRNAs are dysregulated in pituitary adenomas, a class of intracranial neoplasms which account for 10–15% of diagnosed brain tumors. Deregulated miRNAs and their targets contribute to pituitary adenomas progression and are associated with cell cycle control, apoptosis, invasion, and pharmacological treatment of pituitary adenomas. To provide an overview of miRNAs dysregulation and functions of these miRNAs in pituitary adenoma progression, we summarize the deregulated miRNAs and their targets to shed more light on their potential as therapeutic targets and novel biomarkers
Functional examination of novel kisspeptin phosphinic peptides
Kisspeptins acting on their cognate G protein-coupled receptor, kisspeptin receptor, play important roles in the suppression of cancer cell metastasis and regulation of the reproductive system, and therefore are important for therapeutic intervention. All native functional human kisspeptins (kisspeptin-54, kisspsptin-14 and kisspeptin-13) share the 10 amino acids of kisspeptin-10 at their C-terminus (45–54). However, they are inactivated rapidly by matrix metalloproteinases (MMPs) through the cleavage of the peptide bond between glycine51 and leucine52, which limits their clinical applications. Development of MMP-resistant analogues of kisspeptins may provide better therapeutic outputs. In the present study, two kisspeptin phosphinic peptides were designed and synthesized, and their ability to induce phosphorylation of ERK1/2 through kisspeptin receptor and their inhibition on MMP-2 and MMP-9 whose activity correlates with cancer metastasis were assessed. The results showed that one analogue, phosphinic kisspeptin R isomer (PKPR), exhibited kisspeptin receptor-agonistic activity and also inhibitory activity on MMP-2, indicating that PKPR may serve as a lead for the further development of kisspeptin analogues for therapeutic purpose
Probing Dirac Neutrino Properties with Dilepton Signature
The neutrinophilic two Higgs doublet model is one of the simplest models to
explain the origin of tiny Dirac neutrino masses. This model introduces a new
Higgs doublet with eV scale VEV to naturally generate the tiny neutrino masses.
Depending on the same Yukawa coupling, the neutrino oscillation patterns can be
probed with the dilepton signature from the decay of charged scalar .
For example, the normal hierarchy predicts BR BR BR when the lightest neutrino
mass is below 0.01 eV, while the inverted hierarchy predicts BR BR BR.
By precise measurement of BR, we are hopefully to probe the
lightest neutrino mass and the atmospheric mixing angle . Through
the detailed simulation of the dilepton signature and corresponding
backgrounds, we find that the 3 TeV CLIC could discover
GeV for NH and GeV for IH. Meanwhile, the future 100 TeV
FCC-hh collider could probe GeV for NH and
GeV for IH.Comment: 18 pages, 9 figure
Conformal Three-Dimensional Interphase of Li Metal Anode Revealed by Low Dose Cryo-Electron Microscopy
Using cryogenic transmission electron microscopy, we revealed three
dimensional (3D) structural details of the electrochemically plated lithium
(Li) flakes and their solid electrolyte interphase (SEI), including the
composite SEI skin-layer and SEI fossil pieces buried inside the Li matrix. As
the SEI skin-layer is largely comprised of nanocrystalline LiF and Li2O in
amorphous polymeric matrix, when complete Li stripping occurs, the compromised
SEI three-dimensional framework buckles, forming nanoscale bends and wrinkles.
We showed that the flexibility and resilience of the SEI skin-layer plays a
vital role in preserving an intact SEI 3D framework after Li stripping. The
intact SEI network enables the nucleation and growth of the newly plated Li
inside the previously formed SEI network in the subsequent cycles, preventing
additional large amount of SEI formation between newly plated Li metal and the
electrolyte. In addition, cells cycled under the accurately controlled uniaxial
pressure can further enhance the repeated utilization of the SEI framework and
improve the coulombic efficiency (CE) by up to 97%, demonstrating an effective
strategy of reducing the formation of additional SEI and inactive dead Li. The
identification of such flexible and porous 3D SEI framework clarifies the
working mechanism of SEI in lithium metal anode for batteries. The insights
provided in this work will inspire researchers to design more functional
artificial 3D SEI on other metal anodes to improve rechargeable metal battery
with long cycle life
A tetranuclear cobalt(III) cluster with 2-(hydroxymethyl)pyridine ligands
In the title compound, tetrakis[μ3-(2-pyridyl)methanolato]tetrakis[bromido(methanol)cobalt(III)] tetrabromide 2-(hydroxymethyl)pyridine tetrasolvate dihydrate, [Co4Br4(C6H6NO)4(CH3OH)4]Br4·4C6H7NO4·2H2O, the cation comprises a [Co4O4] cubane-type core ( symmetry). The four CoIII ions and bridging O atoms from four (2-pyridyl)methanolate anions are located at alternating vertices of the cube, with bromide ions and methanol ligands on the exterior of the core, completing a distorted octahedral geometry. The structure is stablized by intermolecular O—H⋯Br and O—H⋯O interactions
- …