@misc{10481/60113,
year = {2019},
month = {4},
url = {http://hdl.handle.net/10481/60113},
abstract = {A measurement of the associated production of a top-quark pair (tt¯) with a vector boson (W, Z) in proton-proton collisions at a center-of-mass energy of 13 TeV is presented, using 36.1 fb−1 of integrated luminosity collected by the ATLAS detector at the Large Hadron Collider. Events are selected in channels with two same- or opposite-sign leptons (electrons or muons), three leptons or four leptons, and each channel is further divided into multiple regions to maximize the sensitivity of the measurement. The tt¯Z and tt¯W production cross sections are simultaneously measured using a combined fit to all regions. The best-fit values of the production cross sections are σtt¯Z=0.95±0.08stat.±0.10syst. pb and σtt¯W=0.87±0.13stat.±0.14syst. pb in agreement with the Standard Model predictions. The measurement of the tt¯Z cross section is used to set constraints on effective field theory operators which modify the tt¯Z vertex.},
organization = {We acknowledge the support of ANPCyT, Argentina;
YerPhI, Armenia; ARC, Australia; BMWFW and FWF,
Austria; ANAS, Azerbaijan; SSTC, Belarus; CNPq and
FAPESP, Brazil; NSERC, NRC and CFI, Canada; CERN;
CONICYT, Chile; CAS, MOST and NSFC, China;
COLCIENCIAS, Colombia; MSMT CR, MPO CR and
VSC CR, Czech Republic; DNRF and DNSRC, Denmark;
IN2P3-CNRS, CEA-DRF/IRFU, France; SRNSFG,
Georgia; BMBF, HGF, and MPG, Germany; GSRT,
Greece; RGC, Hong Kong SAR, China; ISF and
Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS,
Japan; CNRST, Morocco; NWO, Netherlands; RCN,
Norway; MNiSW and NCN, Poland; FCT, Portugal;
MNE/IFA, Romania; MES of Russia and NRC KI,
Russian Federation; JINR; MESTD, Serbia; MSSR,
Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South
Africa; MINECO, Spain; SRC andWallenberg Foundation,
Sweden; SERI, SNSF and Cantons of Bern and Geneva,
Switzerland; MOST, Taiwan; TAEK, Turkey; STFC, United Kingdom; DOE and NSF, United States of America.
In addition, individual groups and members have received
support from BCKDF, CANARIE, CRC and Compute
Canada, Canada; COST, ERC, ERDF, Horizon 2020, and
Marie Skłodowska-Curie Actions, European Union;
Investissements d’ Avenir Labex and Idex, ANR, France;
DFG and AvH Foundation, Germany; Herakleitos, Thales
and Aristeia programmes co-financed by EU-ESF and the
Greek NSRF, Greece; BSF-NSF and GIF, Israel; CERCA
Programme Generalitat de Catalunya, Spain; The Royal
Society and Leverhulme Trust, United Kingdom.},
publisher = {American Physical Society},
title = {Measurement of the tt¯Z and tt¯W cross sections in proton-proton collisions at s√=13 TeV with the ATLAS detector},
doi = {10.1103/PhysRevD.99.072009},
author = {Aaboud, M. and Aguilar Saavedra, Juan Antonio and Atlas Collaboration},
}