A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb−1 data sample of proton–proton collisions at View the MathML source recorded with the ATLAS detector at the LHC, events consistent with sqrt(s) = 7 TeV production and decay into a single charged lepton final state are reconstructed. For each event, the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yields Delta m = m(t) - m(anti-t) = 0.67 +- 0.61 (stat) +- 0.41 (syst) GeV, consistent with CPT invariance.
Measurement of the mass difference between top and antitop quarks in pp collisions at sqrt(s) = 7 TeV using the ATLAS detector
GORINI, Edoardo;PRIMAVERA, Margherita;SPAGNOLO, Stefania Antonia;VENTURA, Andrea
2014-01-01
Abstract
A measurement of the mass difference between top and anti-top quarks is presented. In a 4.7 fb−1 data sample of proton–proton collisions at View the MathML source recorded with the ATLAS detector at the LHC, events consistent with sqrt(s) = 7 TeV production and decay into a single charged lepton final state are reconstructed. For each event, the mass difference between the top and anti-top quark candidate is calculated. A two b-tag requirement is used in order to reduce the background contribution. A maximum likelihood fit to these per-event mass differences yields Delta m = m(t) - m(anti-t) = 0.67 +- 0.61 (stat) +- 0.41 (syst) GeV, consistent with CPT invariance.I documenti in IRIS sono protetti da copyright e tutti i diritti sono riservati, salvo diversa indicazione.
