Extrarenal angiomyolipomas (AML) have been reported at various anatomical sites, but infrequently in the gynecological region. In the uterus, only a few cases have been described. We describe a uterine angiomyolipoma occurring in a 40-year-old woman without evidence of tuberous sclerosis. The tumor arose on the right wall of the uterine body and was partially cystic, and it was associated with marked degeneration. It was composed of mature adipose tissue, anomalous blood vessels and non-vascular smooth muscle cells. Immunohistochemistry revealed that non- vascular smooth muscle cells were positive for alpha-smooth muscle actin (alpha-SMA), desmin, vimentin, antihuman muscle actin (HHF35) and progesterone receptor (PR), and negative for cytokeratin, antihuman melanoma (HMB45), CD34, S-100 and estrogen receptor (ER). It is of particular interest that non-vascular smooth muscle cells were negative for HMB45, in contrast to renal and other extrarenal AML in which HMB45 immunoreactivity has been demonstrated in these cells.
The Θ(+) pentaquark baryon was searched for via the π(-)p→K(-)X reaction with a missing mass resolution of 1.4 MeV/c(2) (FWHM) at the Japan Proton Accelerator Research Complex (J-PARC). π(-) meson beams were incident on the liquid hydrogen target with a beam momentum of 1.92 GeV/c. No peak structure corresponding to the Θ(+) mass was observed. The upper limit of the production cross section averaged over the scattering angle of 2° to 15° in the laboratory frame is obtained to be 0.26 μb/sr in the mass region of 1.51-1.55 GeV/c(2). The upper limit of the Θ(+) decay width is obtained to be 0.72 and 3.1 MeV for J(Θ)(P)=1/2(+) and J(Θ)(P)=1/2(-), respectively, using the effective Lagrangian approach.
The first experiment at the J-PARC hadron facility, the J-PARC E19 experiment, aims at searching 15 for the Θ + pentaquark in the hadronic reaction π − p → K − X using the missing-mass technique. Based on a 16 superconducting magnet excited at 2.5 T, the spectrometer achieved the high mass resolution of 1.4MeV/c 2 17 for the Θ + production process. The first data taking was performed in the autumn of 2010. No significant 18 structure was observed in the missing-mass spectrum. The upper limit obtained for the differential cross section 19 is 0.26 µb/sr in the laboratory frame at a 90 % CL. 20 Introduction 21Intensive search for exotic hadrons, particles that consist of four or more quarks, have been made for over 22 30 years, since quantum chromodynamics (QCD) allows for any multiquark system as far as it is colourless.Institute of Particle and Nuclear Studies (IPNS), High Energy Accelerator Research Organization (KEK), Tsukuba 305-0801, Japan E-mail: megumi.naruki@kek.jp The J-PARC E19 experiment was proposed to search for the pentaquark Θ + in the p(π − , K − )X reaction. 38The production mechanism is rather simple in this exclusive reaction, since s-channel process can contribute Experimental Apparatus 48The J-PARC E19 experiment was carried out at the K1.8 beamline of the hadron experimental facility which 61Kaons were identified with a time-of-flight array together with an aerogelČerenkov counter. 62The E19 experiment recorded data in the autumn of 2010 and February 2012. During the first data taking, 63 7.8 × 10 10 beam pions were accumulated on the target at the momentum of 1.92 GeV/c to examine the bump 64 structure observed in the previous experiment. The typical beam intensity was 1M pions/spill, the spill length 65 was 2 s. The analysis details of the first result was reported in Ref. [35]. In the second run, 8.7 × 10 10 beam 66 pions were collected on the target at the beam momentum of 2 GeV/c, which is the maximum momentum at 67 the K1.8 beamline. The acceptable intensity was increased to 1.7M pions/spill thanks to an improvement of 68 the spill time structure. 69The overall performance of the spectrometer was examined using the Σ production in the π + p → K + Σ + 70 reaction. The 8.0×10 3 Σ + events were selected after the vertex cut eliminating background events originat-71 ing from the window of the target cell. The missing-mass resolution for the Σ + production is 1.9 MeV/c 2 72 (FWHM), which corresponds to the mass resolution for the Θ + production of 1.4 MeV/c 2 (FWHM). The 73 differential cross section of Σ + was found to be consistent with the past experimental result [36]. 74 3R e s u l t s 75The missing-mass spectrum for the 1.92 GeV/cπ − p → K − X reaction is shown in Fig. 2. No corresponding 76 structure to Θ + was observed in the spectrum. The spectrum is consistent with the simulated background from 77 φ, Λ (1520) and non resonant KKN productions. Figure 3a shows the missing-mass spectrum after acceptance 78 correction. The data was fitted with a Gaussian peak plus a polyno...
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