2,229 research outputs found
Paraovarian tumor of borderline malignancy: a case report
A case of a 23-year-old woman with a paraovarian tumor is presented. The patient complained of pelvic pain and abdominal swelling. Cystectomy was the initial surgical treatment, but after the histological diagnosis, a staging surgery was carried out. The clinical aspects and subsequent management of related cases are discussed, and a literature review is made
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Z boson production in Pb+Pb collisions at âSnn = 5.02 TeV measured by the ATLAS experiment
The production yield of Z bosons is measured in the electron and muon decay channels in Pb+Pb collisions at âS = 5.02 TeV with the ATLAS detector. Data from the 2015 LHC run corresponding to an integrated luminosity of 0.49 nb are used for the analysis. The Z boson yield, normalised by the total number of minimum-bias events and the mean nuclear thickness function, is measured as a function of dilepton rapidity and event centrality. The measurements in Pb+Pb collisions are compared with similar measurements made in proton-proton collisions at the same centre-of-mass energy. The nuclear modification factor is found to be consistent with unity for all centrality intervals. The results are compared with theoretical predictions obtained at next-to-leading order using nucleon and nuclear parton distribution functions. The normalised Z boson yields in Pb+Pb collisions lie 1-3Ï above the predictions. The nuclear modification factor measured as a function of rapidity agrees with unity and is consistent with a next-to-leading-order QCD calculation including the isospin effect. nn -
Search for flavour-changing neutral currents in processes with one top quark and a photon using 81 fbâ1 of pp collisions at s=13TeV with the ATLAS experiment
A search for flavour-changing neutral current (FCNC) events via the coupling of a top quark, a photon, and an up or charm quark is presented using 81 fbâ1 of protonâproton collision data taken at a centre-of-mass energy of 13 TeV with the ATLAS detector at the LHC. Events with a photon, an electron or muon, a b-tagged jet, and missing transverse momentum are selected. A neural network based on kinematic variables differentiates between events from signal and background processes. The data are consistent with the background-only hypothesis, and limits are set on the strength of the tqÎł coupling in an effective field theory. These are also interpreted as 95% CL upper limits on the cross section for FCNC tÎł production via a left-handed (right-handed) tuÎł coupling of 36 fb (78 fb) and on the branching ratio for tâÎłu of 2.8Ă10â5 (6.1Ă10â5). In addition, they are interpreted as 95% CL upper limits on the cross section for FCNC tÎł production via a left-handed (right-handed) tcÎł coupling of 40 fb (33 fb) and on the branching ratio for tâÎłc of 22Ă10â5 (18Ă10â5)
Measurement of J/Ï production in association with a W ± boson with pp data at 8 TeV
A measurement of the production of a prompt J/Ï meson in association with a W± boson with W± â ΌΜ and J/Ï â ÎŒ+ÎŒâ is presented for J/Ï transverse momenta in the range 8.5â150 GeV and rapidity |yJ/Ï| < 2.1 using ATLAS data recorded in 2012 at the LHC. The data were taken at a proton-proton centre-of-mass energy of s = 8 TeV and correspond to an integrated luminosity of 20.3 fbâ1. The ratio of the prompt J/Ï plus W± cross-section to the inclusive W± cross-section is presented as a differential measurement as a function of J/Ï transverse momenta and compared with theoretical predictions using different double-parton-scattering cross-sections. [Figure not available: see fulltext.]
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Measurement of Azimuthal Anisotropy of Muons from Charm and Bottom Hadrons in pp Collisions at sqrt[s]=13ââTeV with the ATLAS Detector.
The elliptic flow of muons from the decay of charm and bottom hadrons is measured in pp collisions at sqrt[s]=13ââTeV using a data sample with an integrated luminosity of 150ââpb^{-1} recorded by the ATLAS detector at the LHC. The muons from heavy-flavor decay are separated from light-hadron decay muons using momentum imbalance between the tracking and muon spectrometers. The heavy-flavor decay muons are further separated into those from charm decay and those from bottom decay using the distance-of-closest-approach to the collision vertex. The measurement is performed for muons in the transverse momentum range 4-7 GeV and pseudorapidity range |η|<2.4. A significant nonzero elliptic anisotropy coefficient v_{2} is observed for muons from charm decays, while the v_{2} value for muons from bottom decays is consistent with zero within uncertainties
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Combination of searches for Higgs boson pairs in pp collisions at s=13TeV with the ATLAS detector
This letter presents a combination of searches for Higgs boson pair production using up to 36.1 fbâ1 of protonâproton collision data at a centre-of-mass energy s=13 TeV recorded with the ATLAS detector at the LHC. The combination is performed using six analyses searching for Higgs boson pairs decaying into the bbÂŻbbÂŻ, bbÂŻW+Wâ, bbÂŻÏ+Ïâ, W+WâW+Wâ, bb¯γγ and W+Wâγγ final states. Results are presented for non-resonant and resonant Higgs boson pair production modes. No statistically significant excess in data above the Standard Model predictions is found. The combined observed (expected) limit at 95% confidence level on the non-resonant Higgs boson pair production cross-section is 6.9 (10) times the predicted Standard Model cross-section. Limits are also set on the ratio (Îșλ) of the Higgs boson self-coupling to its Standard Model value. This ratio is constrained at 95% confidence level in observation (expectation) to â5.0<Îșλ<12.0 (â5.8<Îșλ<12.0). In addition, limits are set on the production of narrow scalar resonances and spin-2 KaluzaâKlein RandallâSundrum gravitons. Exclusion regions are also provided in the parameter space of the habemus Minimal Supersymmetric Standard Model and the Electroweak Singlet Model
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