24 research outputs found

    Assessment of Prognostic Factors for Reconstruction of the Upper Third of the Ureter with A Tubularized Pelvis Flap

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    Ureteral plastic with a tubularized pelvic flap is a rare option of ureteral reconstruction. We present the assessment of the factors that are important for predicting the success of this operation.The aim. The purpose of the study was to assess the factors that are important in predicting the success of reconstruction of the upper third of the ureter with a tubularized pelvis flap.Material and methods. The study included 73 patients who were divided into 2 groups. The first group had extended strictures of the upper third of the ureter (n=14 / 19.2 %), and the second group had pathology of the ureteropelvic junction associated with ureterovascular conflict (n=59 / 80.8 %).Results. The length of the pelvic flap varied from 2.5 to 10.0 cm and reached an average of 3.9 cm. Early postoperative complications (Clavien-Dindo gradation <3) were observed in 14 (9.2 %) patients out of 73, and dominated in the first group. The total number of positive long-term results (good + satisfactory) was 97.3 %. Two poor results were reported only in patients of the first group with prolonged recurrent strictures. A significant factor in the prognosis of complications was the secondary nature of the operation (p <0.004). The factors of the long-term results prognosis were the performance of dismembered tubularized flap pyeloplasty due to the extended strictures of the upper third of the ureter, and the duration of the operation more than 120 minutes (p <0.009 and p <0.026).Conclusion. Surgical correction of the upper third of the ureter by a tubularized pelvis flap is a highly effective and safe method of reconstruction of the upper urinary tract. The main negative factors in the prognosis of this operation results are the secondary nature of the operation, the performance of the dismembered tubularized flap pyeloplasty because of the extended strictures of the upper third of the ureter, and the duration of the operation more than 120 minute

    Expression of Interest for a Phase-II LHCb Upgrade: Opportunities in flavour physics, and beyond, in the HL-LHC era

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    https://cds.cern.ch/record/224431

    Expression of Interest for a Phase-II LHCb Upgrade: Opportunities in flavour physics, and beyond, in the HL-LHC era

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    A Phase-II Upgrade is proposed for the LHCb experiment in order to take full advantage of the flavour-physics opportunities at the HL-LHC, and other topics that can be studied with a forward spectrometer. This Upgrade, which will be installed in Long Shutdown 4 of the LHC (2030), will build on the strengths of the current experiment and the Phase-I Upgrade, but will consist of re-designed sub-systems that can operate at a luminosity of 2×1034cm−2s−1, ten times that of the Phase-I Upgrade detector. New and improved detector components will increase the intrinsic performance of the experiment in certain key areas. In particular the installation of a tungsten sampling electromagnetic calorimeter will widen LHCb's capabilities for decays involving π0 and η mesons, electrons, and photons from loop-level penguin processes. The physics motivation is presented, and the prospects for operating the LHCb Interaction Point at high luminosity are assessed. The challenges for the detector are described and possible solutions are discussed. Finally, the key R\&D areas are summarised, together with a set of initial modifications suitable for implementation during Long Shutdown 3 (2024--2026)

    Search for the rare hadronic decay Bs0ppˉB_s^0\to p \bar{p}

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    A search for the rare hadronic decay Bs0→pp¯ is performed using proton-proton collision data recorded by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6  fb-1. No evidence of the decay is found and an upper limit on its branching fraction is set at B(Bs0→pp¯)&lt;4.4(5.1)×10-9 at 90% (95%) confidence level; this is currently the world’s best upper limit. The decay mode B0→pp¯ is measured with very large significance, confirming the first observation by the LHCb experiment in 2017. The branching fraction is determined to be B(B0→pp¯)=(1.27±0.15±0.05±0.04)×10-8, where the first uncertainty is statistical, the second is systematic and the third is due to the external branching fraction of the normalization channel B0→K+π-. The combination of the two LHCb measurements of the B0→pp¯ branching fraction yields B(B0→pp¯)=(1.27±0.13±0.05±0.03)×10-8.A search for the rare hadronic decay Bs0ppˉB_s^0\to p \bar{p} is performed using proton-proton collision data recorded by the LHCb experiment at a center-of-mass energy of 13 TeV, corresponding to an integrated luminosity of 6 fb1^{-1}. No evidence of the decay is found and an upper limit on its branching fraction is set at B(Bs0ppˉ)<4.4 (5.1)×109{\cal B}(B_s^0\to p \bar{p}) < 4.4~(5.1) \times 10^{-9} at 90% (95%) confidence level; this is currently the world's best upper limit. The decay mode B0ppˉB^0\to p \bar{p} is measured with very large significance, confirming the first observation by the LHCb experiment in 2017. The branching fraction is determined to be B(B0ppˉ)=(1.27±0.15±0.05±0.04)×108{\cal B}(B^0\to p \bar{p}) = \rm (1.27 \pm 0.15 \pm 0.05 \pm 0.04) \times 10^{-8}, where the first uncertainty is statistical, the second is systematic and the third is due to the external branching fraction of the normalization channel B0K+πB^0\to K^+\pi^-. The combination of the two LHCb measurements of the B0ppˉB^0\to p \bar{p} branching fraction yields B(B0ppˉ)=(1.27±0.13±0.05±0.03)×108{\cal B}(B^0\to p \bar{p}) = \rm (1.27 \pm 0.13 \pm 0.05 \pm 0.03) \times 10^{-8}

    Observation of sizeable ω\omega contribution to χc1(3872)π+πJ/ψ\chi_{c1}(3872) \to \pi^+\pi^- J/\psi decays

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    Resonant structures in the dipion mass spectrum from χc1(3872)π+πJ/ψ\chi_{c1}(3872)\to\pi^+\pi^- J/\psi decays, produced via B+K+χc1(3872)B^+\to K^+\chi_{c1}(3872) decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb1^{-1}. A sizeable contribution from the isospin conserving χc1(3872)ωJ/ψ\chi_{c1}(3872)\to\omega J/\psi decay is established for the first time, (21.4±2.3±2.0)%(21.4\pm2.3\pm2.0)\%, with a significance of more than 7.1σ7.1\sigma. The amplitude of isospin violating decay, χc1(3872)ρ0J/ψ\chi_{c1}(3872)\to\rho^0 J/\psi, relative to isospin conserving decay, χc1(3872)ωJ/ψ\chi_{c1}(3872)\to\omega J/\psi, is properly determined, and it is a factor of six larger than expected for a pure charmonium state.Resonant structures in the dipion mass spectrum from χc1(3872)→π+π-J/ψ decays, produced via B+→K+χc1(3872) decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9  fb-1. A sizeable contribution from the isospin conserving χc1(3872)→ωJ/ψ decay is established for the first time, (21.4±2.3±2.0)%, with a significance of more than 7.1σ. The amplitude of isospin violating decay, χc1(3872)→ρ0J/ψ, relative to isospin conserving decay, χc1(3872)→ωJ/ψ, is properly determined, and it is a factor of 6 larger than expected for a pure charmonium state.Resonant structures in the dipion mass spectrum from χc1(3872)π+πJ/ψ\chi_{c1}(3872)\to\pi^+\pi^- J/\psi decays, produced via B+K+χc1(3872)B^+\to K^+\chi_{c1}(3872) decays, are analyzed using proton-proton collision data collected by the LHCb experiment, corresponding to an integrated luminosity of 9 fb1fb^{-1}. A sizeable contribution from the isospin conserving χc1(3872)ωJ/ψ\chi_{c1}(3872)\to\omega J/\psi decay is established for the first time, (21.4±2.3±2.0)%(21.4\pm2.3\pm2.0)\%, with a significance of more than 7.1σ7.1\sigma. The amplitude of isospin violating decay, χc1(3872)ρ0J/ψ\chi_{c1}(3872)\to\rho^0 J/\psi, relative to isospin conserving decay, χc1(3872)ωJ/ψ\chi_{c1}(3872)\to\omega J/\psi, is properly determined, and it is a factor of six larger than expected for a pure charmonium state