The Tile hadronic calorimeter of the ATLAS detector has undergone extensive testing in the experi... more The Tile hadronic calorimeter of the ATLAS detector has undergone extensive testing in the experimental hall since its installation in late 2005. The readout, control and calibration systems have been fully operational since 2007 and the detector has successfully collected data from the LHC single beams in 2008 and first collisions in 2009. This paper gives an overview of the Tile Calorimeter performance as measured using random triggers, calibration data, data from cosmic ray muons and single beam data. The detector operation status, noise characteristics and performance of the calibration systems are presented, as well as the validation of the timing and energy calibration carried out with minimum ionising cosmic ray muons data. The calibration systems’ precision is well below the design value of 1%. The determination of the global energy scale was performed with an uncertainty of 4%.
First measurements of the W → ℓν and Z/γ * → ℓℓ (ℓ = e, μ) production cross sections in proton-pr... more First measurements of the W → ℓν and Z/γ * → ℓℓ (ℓ = e, μ) production cross sections in proton-proton collisions at \( \sqrt {s} = 7\;{\text{TeV}} \) are presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W → ℓν and 179 Z/γ * → ℓℓ candidate events selected from a data set corresponding to an integrated luminosity of approximately 320 nb. The measured total W and Z/γ ∗-boson production cross sections times the respective leptonic branching ratios for the combined electron and muon channels are \( \sigma_W^{\text{tot}} \) . BR(W → ℓν) = 9.96 ± 0.23(stat) ± 0.50(syst) ± 1.10(lumi) nb and \( \sigma_{{{Z} \left/ {\gamma } \right.}}^{\text{tot}} \) BR(Z/γ ∗ → ℓℓ) = 0.82 ± 0.06 (stat) ± 0.05 (syst) ± 0.09(lumi) nb (within the invariant mass window 66 m ℓℓ 116GeV). The W/Z cross-section ratio is measured to be 11.7 ± 0.9(stat) ± 0.4(syst). In addition, measurements of the W + and W − production cross sections and of the lepton charge asymmetry are reported. Theoretical predictions based on NNLO QCD calculations are found to agree with the measurements.
Bjog-an International Journal of Obstetrics and Gynaecology, 2009
Haemorrhage, a leading cause of maternal morbidity and mortality, is frequently associated with c... more Haemorrhage, a leading cause of maternal morbidity and mortality, is frequently associated with caesarean section. Allogeneic blood is an increasingly rare and scare resource. Intraoperative Cell Salvage (IOCS) offers the possibility of improving outcome and reducing allogeneic blood transfusion in cases of haemorrhage at caesarean section. The available literature on the use of IOCS in obstetrics demonstrates that there is limited evidence to support or refute the use of IOCS at caesarean section. However, this procedure has been introduced into obstetric practice. Before opinions about its use become solidified, there is a window of opportunity to launch a large multicentre randomised controlled trial to address the current equipoise.
The Tile hadronic calorimeter of the ATLAS detector has undergone extensive testing in the experi... more The Tile hadronic calorimeter of the ATLAS detector has undergone extensive testing in the experimental hall since its installation in late 2005. The readout, control and calibration systems have been fully operational since 2007 and the detector has successfully collected data from the LHC single beams in 2008 and first collisions in 2009. This paper gives an overview of the Tile Calorimeter performance as measured using random triggers, calibration data, data from cosmic ray muons and single beam data. The detector operation status, noise characteristics and performance of the calibration systems are presented, as well as the validation of the timing and energy calibration carried out with minimum ionising cosmic ray muons data. The calibration systems’ precision is well below the design value of 1%. The determination of the global energy scale was performed with an uncertainty of 4%.
First measurements of the W → ℓν and Z/γ * → ℓℓ (ℓ = e, μ) production cross sections in proton-pr... more First measurements of the W → ℓν and Z/γ * → ℓℓ (ℓ = e, μ) production cross sections in proton-proton collisions at \( \sqrt {s} = 7\;{\text{TeV}} \) are presented using data recorded by the ATLAS experiment at the LHC. The results are based on 2250 W → ℓν and 179 Z/γ * → ℓℓ candidate events selected from a data set corresponding to an integrated luminosity of approximately 320 nb. The measured total W and Z/γ ∗-boson production cross sections times the respective leptonic branching ratios for the combined electron and muon channels are \( \sigma_W^{\text{tot}} \) . BR(W → ℓν) = 9.96 ± 0.23(stat) ± 0.50(syst) ± 1.10(lumi) nb and \( \sigma_{{{Z} \left/ {\gamma } \right.}}^{\text{tot}} \) BR(Z/γ ∗ → ℓℓ) = 0.82 ± 0.06 (stat) ± 0.05 (syst) ± 0.09(lumi) nb (within the invariant mass window 66 m ℓℓ 116GeV). The W/Z cross-section ratio is measured to be 11.7 ± 0.9(stat) ± 0.4(syst). In addition, measurements of the W + and W − production cross sections and of the lepton charge asymmetry are reported. Theoretical predictions based on NNLO QCD calculations are found to agree with the measurements.
Bjog-an International Journal of Obstetrics and Gynaecology, 2009
Haemorrhage, a leading cause of maternal morbidity and mortality, is frequently associated with c... more Haemorrhage, a leading cause of maternal morbidity and mortality, is frequently associated with caesarean section. Allogeneic blood is an increasingly rare and scare resource. Intraoperative Cell Salvage (IOCS) offers the possibility of improving outcome and reducing allogeneic blood transfusion in cases of haemorrhage at caesarean section. The available literature on the use of IOCS in obstetrics demonstrates that there is limited evidence to support or refute the use of IOCS at caesarean section. However, this procedure has been introduced into obstetric practice. Before opinions about its use become solidified, there is a window of opportunity to launch a large multicentre randomised controlled trial to address the current equipoise.
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