Measurement of the correlation between the polar angles of leptons from top quark decays in the helicity basis at √ s = 7 T e V using the ATLAS detector

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dc.contributor.author Amelung, Christoph
dc.contributor.author Amundsen, Glenn
dc.contributor.author Artoni, Giacomo
dc.contributor.author Barone, Gaetano
dc.contributor.author Bensinger, James R.
dc.contributor.author Blocker, Louis
dc.contributor.author Coffey, Laurel
dc.contributor.author Dhaliwal, Saminder
dc.contributor.author Loew, Kevin
dc.contributor.author Sciolla, Gabriella
dc.contributor.author Venturini, Alessio
dc.contributor.author Zengel, Keith
dc.date.accessioned 2018-02-09T16:38:37Z
dc.date.available 2018-02-09T16:38:37Z
dc.date.issued 2016-01-13
dc.identifier.citation G. Aad et al. (ATLAS Collaboration) Phys. Rev. D 93, 012002
dc.identifier.issn 2470-0010
dc.identifier.issn 2470-0029
dc.identifier.uri http://hdl.handle.net/10192/35412
dc.description Published version can be found on Physical Review D's site: https://journals.aps.org/prd/abstract/10.1103/PhysRevD.93.012002
dc.description.abstract A measurement of the correlations between the polar angles of leptons from the decay of pair-produced t and ¯t quarks in the helicity basis is reported, using proton-proton collision data collected by the ATLAS detector at the LHC. The dataset corresponds to an integrated luminosity of 4.6  fb−1 at a center-of-mass energy of √ s=7  TeV collected during 2011. Candidate events are selected in the dilepton topology with large missing transverse momentum and at least two jets. The angles θ1 and θ2between the charged leptons and the direction of motion of the parent quarks in the t¯t rest frame are sensitive to the spin information, and the distribution of cosθ1⋅cosθ2 is sensitive to the spin correlation between the t and ¯t quarks. The distribution is unfolded to parton level and compared to the next-to-leading order prediction. A good agreement is observed.
dc.description.sponsorship Supported by 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, DNSRC and Lundbeck Foundation, Denmark; EPLANET, ERC and NSRF, European Union; IN2P3-CNRS, CEA-DSM/IRFU, France; GNSF, Georgia; BMBF, DFG, HGF, MPG and AvH Foundation, Germany; GSRT and NSRF, Greece; RGC, Hong Kong SAR, China; ISF, MINERVA, GIF, I-CORE and Benoziyo Center, Israel; INFN, Italy; MEXT and JSPS, Japan; CNRST, Morocco; FOM and NWO, Netherlands; BRF and RCN, Norway; MNiSW and NCN, Poland; GRICES and FCT, Portugal; MNE/IFA, Romania; MES of Russia and NRC KI, Russian Federation; JINR; MSTD, Serbia; MSSR, Slovakia; ARRS and MIZŠ, Slovenia; DST/NRF, South Africa; MINECO, Spain; SRC and Wallenberg Foundation, Sweden; SER, SNSF and Cantons of Bern and Geneva, Switzerland; NSC, Taiwan; TAEK, Turkey; STFC, the Royal Society and Leverhulme Trust, United Kingdom; DOE and NSF, United States of America. The 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 (UK) and BNL (USA) and in the Tier-2 facilities worldwide.
dc.language English
dc.language.iso eng
dc.publisher American Physical Society
dc.rights Copyright by CERN 2016
dc.subject Leptons
dc.subject Physical systems--Leptons--Top quark
dc.subject Hadron colliders
dc.title Measurement of the correlation between the polar angles of leptons from top quark decays in the helicity basis at √ s = 7 T e V using the ATLAS detector
dc.type Article
dc.identifier.doi https://doi.org/10.1103/PhysRevD.93.012002


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