465 research outputs found
Search for decay with VES detector
The isospin violating decay has been studied at
VES facility. This study is based at the statistics acquired in
interactions at 27, 36.6 and 41 GeV/c in diffractive reaction . The decay is observed. The ratio of
decay probabilities to is .Comment: 10 pages, 8 figures, presented at XII Conference on Hadron
Spectroscop
A search for J^{PC}=1^{-+} exotic mesons in the pi- pi- pi+ and pi- pi0 pi0 systems
A partial wave analysis (PWA) of the pi-pi-pi+ and pi-pi0pi0 systems produced
in the reaction pi- p -> (3pi)-p at 18 GeV/c was carried out using an isobar
model assumption. This analysis is based on 3.0M pi-pi0pi0 events and 2.6M
pi-pi-pi+ events and shows production of the a2(1320), pi2(1670) and \pi(1800)
mesons. An earlier analysis of 250K pi-pi-pi+ events from the same experiment
showed possible evidence for a J^{PC}=1^{-+}$ exotic meson with a mass of 1.6
GeV/c^2 decaying into rho pi. In this analysis of a higher statistics sample of
the (3pi)- system in two charged modes we find no evidence of an exotic meson.Comment: 4 pages, 5 figures, added comment about the negative reflectivity
exotic wave
An observation of the meson in the system in the Pion- Interaction at Momentum of 29 GeV
The charge-exchange reaction ,
, is studied with
the upgraded VES facility (U-70, Protvino) in the interaction of a 29 GeV pion
beam with a beryllium target. The distribution over the invariant mass of the
system shows a near-threshold signal. A partial wave analysis
reveals that the scalar state () dominates in this mass region.
The observed signal can be described with a contribution of the known
resonance . Using OPE approximation for the reaction the product of branching fractions is found to be:
Lymphocyte subpopulations of bone marrow of breast cancer patients
We have studied bone marrow lymphocytes subpopulations in 67 patients with breast cancer and 13 patients with benign processes in the mammary gland. Morphological study of the cellular composition of the bone marrow and immunological analysis of lymphocyte subpopulations have been done. Comparative characterization of lymphocyte subpopulations in the bone marrow of patients with breast cancer and benign breast diseases was done by flow cytometry. The gate of Mature lymphocytes (CD45++) studied subpopulations of T cells (CD3), b cells (CD19), NK cells (CD56+CD3–). Among T lymphocytes (CD3+) was studied TCRγδ and TCRαβ cells, a subpopulation of CD4, CD8, CD4+, CD25+ T-regulatory cells. Within В-lymphocytes (CD19+) was studied subpopulations CD10, CD38, CD5 lymphocytes. We revealed a significant increase of CD5+, CD38+ B-cells in patients with breast cancer compared to benign tumors. Index of maturation of erythrocytes was significantly higher in BC 0.96 in comparison with benign processes 0.92. When comparing immunological data with histological structure of the tumor in the group of breast cancer patients, it was noted that the percent of CD10+ B-lymphocytes was significantly higher in infiltrative ductal cancer in comparison to infiltrative lobular carcinoma (19.3 and 8.0 % accordingly; p = 0.024)
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