79 research outputs found
production in scattering process
In the present work, the production of in the scattering
process is investigated by using an effective Lagrangian approach, where
is considered as a molecular state. Our
estimations indicate that the cross sections for are
at , where
the uncertainties are resulted from the variation of the model parameter. As
for the process, the cross sections are estimated to
be at ,
which is consistent with the experimental measurements.Comment: 5 pages, 5 figure
Coupled-channel interactions and the origin of
Motivated by the recent observation of and
in the invariant mass distributions, we
investigate interactions in a coupled-channel approach. We
show that the relativistic corrections could be significant for the energy far
away from the threshold. Within the hidden local symmetry formalism, a sizable
attraction interaction is found in the isospin triplet sector that can
form a bound or a virtual state, which is consistent with the experimentally
observed . By reproducing a -
bound/virtual state with the pole mass equal to that of the
measured by LHCb in the sector , we
determine the unknown parameter in the loop function, and then search for
possible poles in the sectors of , 2 and , , 1, 2. The
predicted resonances provide a useful reference for the future experimental
studies of the systems and can be also helpful to unravel the
nature of the .10Comment: 10 pages, 6 figures, 3 table
Expressions of Wingless and Int1 (Wnt)-induced secreted protein 1 in paraquat-poisoned patients
Purpose: To study the expression of Wingless & Int1 (Wnt)-induced secreted protein 1 (WISP1) in paraquat (PQ)-poisoned patients.Methods: A total of 37 PQ-poisoned patients were enrolled in the study, and divided into non-survivor group (NS) and survival group (S) based on the final therapeutic outcome. Besides, another normal control group (NC) comprised of normal healthy people. Serum PQ concentration was determined by high performance liquid chromatography (HPLC), while reverse transcription-polymerase chain reaction (RT-PCR) and enzyme-linked immunosorbent assay (ELISA) were used to evaluate WISP1 in the serum of PQ poisoned patients.Results: PQ intake in NS and S groups were 23.58 ± 26.23 and 143.18 ± 263.04 mL, respectively, while serum PQ concentration was 2.07 ± 0.67 and 4.12 ± 1.74 mg/L, respectively. Significant correlation was found between the outcome of patients and serum PQ concentration (OR = 1.434, p < 0.01). Serum PQ concentration was closely correlated with WISP1 gene expression levels (OR = 0.621, p < 0.01) and serum WISP1 protein levels (OR = 0.596, p < 0.01) on the first day after poisoning. Furthermore, a correlation between serum PQ concentration and WISP1 levels was found on the third after poisoning (OR = 0.447, p < 0.01).Conclusion: WISP1 is over-expressed in PQ-poisoned patients, and serum PQ concentration may be a useful index for the prognosis of PQ poisoned patients.Keywords: Wingless & Int1 (Wnt)-induced secreted protein 1, Poison, Paraquat, Prognosis, Correlatio
1,4-Bis(1H-benzimidazol-1-yl)benzene
In the title compound, C20H14N4, the dihedral angles between the central benzene ring and the pendant benzimidazole ring systems are 46.60 (15) and 47.89 (16)°. The dihedral angle between the benzimidazole ring systems is 85.62 (12)° and the N atoms lie to the same side of the molecule. In the crystal, molecules are linked by C—H⋯N interactions and weak aromatic π–π stacking [shortest centroid–centroid separation = 3.770 (2) Å] is observed
Renormalization of the Cabibbo-Kobayashi-Maskawa Quark Mixing Matrix
We have investigated the present renormalization prescriptions of
Cabibbo-Kobayashi-Maskawa (CKM) matrix. When considering the prescription which
is formulated with reference to the case of zero mixing we find it doesn't
satisfy the unitary condition of the bare CKM matrix. After added a delicate
patch this problem can be solved at one-loop level. In this paper We generalize
this prescription to all loop levels and keep the unitarity of the bare CKM
matrix, simultaneously make the amplitude of an arbitrary physical process
involving quark mixing convergent and gauge independent. We also find that in
order to keep the CKM counterterms gauge independent the unitarity of the bare
CKM matrix must be preserved.Comment: has been revised, 8 pages, 1 figur
5,11,17,23-Tetra-tert-butyl-25,27-bis[2-(4-nitrophenoxy)ethoxy]calix[4]arene-26,28-diol acetonitrile tetrasolvate
In the crystal structure of the title compound, C60H70N2O10·4CH3CN, the calix[4]arene molecule adopts an open-cone conformation with two intramolecular O—H⋯O hydrogen bonds. The four benzene rings of the calix[4]arene are twisted to the mean plane defined by four methylene C atoms bridging the benzene rings, with dihedral angles ranging from 57.74 (10) to 65.99 (12)°. Two pendant nitrophenyl rings are nearly perpendicular to each other, the dihedral angle being 70.9 (3)°. The asymmetric unit of the crystal structure contains four acetonitrile solvent molecules, one of which lies in the calix cavity and makes C—H⋯π interactions and another links with the calix[4]arene via C—H⋯O hydrogen bonding. One tert-butyl group is disordered over two sets of sites, with a 0.736 (13):0.264 (13) occupancy ratio
Interpretation of and in the ISPE mechanism and the Charmonium Counterpart
The initial single pion emission (ISPE) mechanism is applied to the processes
whose details have been recently
reported at ICHEP2012 and we obtain reasonable agreement with Bell's
measurements, i.e., we succeed in reproducing the enhancement structures of
and . Inspired by this success, we predict the
corresponding enhancement structures in higher charmonia open charm pion decay
near the thresholds of and .Comment: 5 pages, 4 figures. More references adde
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