New data concerning neutrino oscillations as obtained in the T2K and NOvA accelerator neutrino experiments are considered. Both collaborations reported on a moderate preference for normal mass ...ordering, but the difference of measured values of CP violating phases δ
CP
amounted to two standard deviations (2σ) and the result of T2K experiment excluded CP invariance conservation with about 2σ confidence. Joint analysis of the data of two experiments can lead to inverted mass hierarchy and δ
CP
≈ 3π/2. In addition, importance of the obtained results for non-oscillation analysis of neutrino experiments is discussed.
The charged-current quasi-elastic scattering of muon neutrinos on a carbon target is analyzed using the relativistic distorted-wave impulse approximation (RDWIA), taking into account the contribution ...of the two-particle and two-hole meson exchange current (MEC) to the weak response functions. A fit the RDWIA + MEC model to the MiniBooNE neutrino data is performed, and the best-fit value of nucleon axial mass MA≈1.20 GeV is obtained. We also extract the values of the axial form factor FA(Q2) as a function of the squared momentum transfer Q2 from the measured dσ/dQ2 cross section. The flux-integrated charged-current quasi-elastic–like differential cross sections for neutrino scattering at energies of the NOvA experiment are estimated within the RDWIA + MEC approach.
Using data of the Baksan Underground Scintillation Telescope we have searched for muon neutrinos and antineutrinos with energies above 1 GeV coinciding with the gravitational wave (GW) event GW170817 ...that was recorded on August 17, 2017, by the Advanced Laser Interferometer Gravitational-Wave Observatory (LIGO) and Advanced Virgo observatories. This is the first detection of the new type of events occurring as a result of a merger of two neutron stars in a binary system. A short gamma-ray burst (GRB) GRB170817A accompanying this event is evidence of particle acceleration in the source whose precise position was determined by detection of the subsequent optical signal. No neutrino signals were found with the Baksan Underground Scintillation Telescope in the interval ±500 s around the moment of the gravitational wave event GW170817, as well as during the next 14 days. The upper limits on integral fluxes of muon neutrino and antineutrino from the source are derived.
Background. The term “paraduodenal pancreatitis” (PP) was proposed as a synonym for duodenal dystrophy (DD) and groove pancreatitis, but it is still unclear what organ PP originates from and how to ...treat it properly. Objective. To assess the results of different types of treatment for PP. Method. Prospective analysis of 62 cases of PP (2004–2013) with histopathology of 40 specimens was performed; clinical presentation was assessed and the results of treatment were recorded. Results. Preoperative diagnosis was correct in all the cases except one (1.9%). Patients presented with abdominal pain (100%), weight loss (76%), vomiting (30%), and jaundice (18%). CT, MRI, and endoUS were the most useful diagnostic modalities. Ten patients were treated conservatively, 24 underwent pancreaticoduodenectomies (PD), pancreatico- and cystoenterostomies (8), Nakao procedures (5), duodenum-preserving pancreatic head resections (5), and 10 pancreas-preserving duodenal resections (PPDR) without mortality. Full pain control was achieved after PPRDs in 83%, after PDs in 85%, and after PPPH resections and draining procedures in 18% of cases. Diabetes mellitus developed thrice after PD. Conclusions. PD is the main surgical option for PP treatment at present; early diagnosis makes PPDR the treatment of choice for PP; efficacy of PPDR for DD treatment provides proof that so-called PP is an entity of duodenal, but not “paraduodenal,” origin.
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