Aaltonen, T;
Gonzalez, BA;
Amerio, S;
Amidei, D;
Anastassov, A;
Annovi, A;
Antos, J;
... CDF Collaboration; + view all
(2011)
Measurement of the Mass Difference between t and (t)over-bar Quarks.
PHYS REV LETT
, 106
(15)
, Article 152001. 10.1103/PhysRevLett.106.152001.
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Abstract
We present a direct measurement of the mass difference between t and (t) over bar quarks using t (t) over bar candidate events in the lepton + jets channel, collected with the CDF II detector at Fermilab's 1.96 TeV Tevatron p (p) over bar Collider. We make an event by event estimate of the mass difference to construct templates for top quark pair signal events and background events. The resulting mass difference distribution of data is compared to templates of signals and background using a maximum likelihood fit. From a sample corresponding to an integrated luminosity of 5.6 fb(-1), we measure a mass difference, Delta M-top = M-t - M-(t) over bar = - 3:3 +/- 1.4(stat) +/- 1.0(syst) GeV/c(2), approximately 2 standard deviations away from the CPT hypothesis of zero mass difference.
| Type: | Article |
|---|---|
| Title: | Measurement of the Mass Difference between t and (t)over-bar Quarks |
| Open access status: | An open access version is available from UCL Discovery |
| DOI: | 10.1103/PhysRevLett.106.152001 |
| Publisher version: | http://dx.doi.org/10.1103/PhysRevLett.106.152001 |
| Language: | English |
| Additional information: | © 2011 American Physical Society |
| Keywords: | CPT VIOLATION, MODEL |
| UCL classification: | UCL UCL > Provost and Vice Provost Offices > UCL BEAMS UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences UCL > Provost and Vice Provost Offices > UCL BEAMS > Faculty of Maths and Physical Sciences > Dept of Physics and Astronomy |
| URI: | https://discovery.ucl.ac.uk/id/eprint/1307739 |
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