@misc{10481/96009,
year = {2016},
month = {1},
url = {https://hdl.handle.net/10481/96009},
abstract = {The cross-section for the production of a single top quark in association with a W boson in proton-proton collisions at √s = 8TeV
 is measured. The dataset corresponds to an integrated luminosity of 20.3 fb−1, collected by the ATLAS detector in 2012 at the Large Hadron Collider at CERN. Events containing two leptons and one central b-jet are selected. The W t signal is separated from the backgrounds using boosted decision trees, each of which combines a number of discriminating variables into one classifier. Production of W t events is observed with a significance of 7.7σ. The cross-section is extracted in a profile likelihood fit to the classifier output distributions. The W t cross-section, inclusive of decay modes, is measured to be 23.0 ± 1.3(stat.) 
+ 3.2
− 3.5
(syst.)±1.1(lumi.) pb. The measured cross-section is used to extract a value for the CKM matrix element |V tb | of 1.01 ± 0.10 and a lower limit of 0.80 at the 95% confidence level. The cross-section for the production of a top quark and a W boson is also measured in a fiducial acceptance requiring two leptons with p T > 25 GeV and |η| < 2.5, one jet with p T > 20 GeV and |η| < 2.5, and E  
miss
T
 > 20 GeV, including both W t and top-quark pair events as signal. The measured value of the fiducial cross-section is 0.85 ± 0.01(stat.) 
+ 0.07
− 0.07
(syst.)±0.03(lumi.) pb.},
organization = {CERN for the very successful operation of the LHC},
organization = {ANPCyT, Argentina},
organization = {YerPhI, Armenia},
organization = {ARC, Australia},
organization = {BMWFW and FWF, Austria},
organization = {ANAS, Azerbaijan},
organization = {SSTC, Belarus},
organization = {CNPq and
FAPESP, Brazil},
organization = {NSERC, NRC and CFI, Canada},
organization = {CONICYT, Chile},
organization = {CAS, MOST
and NSFC, China},
organization = {COLCIENCIAS, Colombia},
organization = {MSMT CR, MPO CR and VSC CR, Czech
Republic},
organization = {NRF, DNSRC and Lundbeck Foundation, Denmark},
organization = {IN2P3-CNRS, CEADSM/
IRFU, France},
organization = {GNSF, Georgia},
organization = {BMBF, HGF, and MPG, Germany},
organization = {GSRT, Greece},
organization = {RGC, Hong Kong SAR, China},
organization = {ISF, I-CORE and Benoziyo Center, Israel},
organization = {INFN, Italy},
organization = {MEXT and JSPS, Japan},
organization = {CNRST, Morocco},
organization = {FOM and NWO, Netherlands},
organization = {RCN, Norway},
organization = {MNiSW and NCN, Poland},
organization = {FCT, Portugal},
organization = {MNE/IFA, Romania},
organization = {MES of Russia and
NRC KI, Russian Federation},
organization = {JINR},
organization = {MESTD, Serbia},
organization = {MSSR, Slovakia},
organization = {ARRS and MIZ S,
Slovenia},
organization = {DST/NRF, South Africa},
organization = {MINECO, Spain},
organization = {SRC and Wallenberg Foundation,
Sweden; SERI, SNSF and Cantons of Bern and Geneva, Switzerland; MOST, Taiwan;
TAEK, Turkey},
organization = {STFC, United Kingdom},
organization = {DOE and NSF, United States of America},
organization = {Individual groups and members have received support from BCKDF, the Canada
Council, CANARIE, CRC, Compute Canada, FQRNT, and the Ontario Innovation Trust,
Canada},
organization = {EPLANET, ERC, FP7, Horizon 2020 and Marie Sk lodowska-Curie Actions, European
Union},
organization = {Investissements d'Avenir Labex and Idex, ANR, Region Auvergne and Fondation
Partager le Savoir, France},
organization = {DFG and AvH Foundation, Germany},
organization = {Herakleitos, Thales
and Aristeia programmes co- nanced by EU-ESF and the Greek NSRF},
organization = {GIF and
Minerva, Israel},
organization = {BRF, Norway},
organization = {the Royal Society and Leverhulme Trust, United Kingdom},
organization = {Crucial computing support from all WLCG partners is acknowledged gratefully,
in particular from CERN and the ATLAS Tier-1 facilities at TRIUMF (Canada), NDGF
(Denmark, Norway, Sweden), CC-IN2P3 (France), KIT/GridKA (Germany), INFN-CNAF
(Italy), NL-T1 (Netherlands), PIC (Spain), ASGC (Taiwan), RAL (U.K.) and BNL
(U.S.A.) and in the Tier-2 facilities worldwide},
publisher = {Springer},
keywords = {Hadron-Hadron scattering},
keywords = {Top physics},
title = {Measurement of the production cross-section of a single top quark in association with a W boson at 8TeV with the ATLAS experiment},
doi = {10.1007/JHEP01(2016)064},
author = {Aad, G. and Aguilar Saavedra, Juan Antonio and Atlas Collaboration, /},
}