Measurement of Top Quark Polarization in $$t\bar{t}$$ Lepton + Jets Final States at D0
We present a measurement of top quark polarization in $$t\bar{t}$$ pair production in $$p\bar{p}$$ collisions at $$\sqrt{s}=1.96$$ TeV using data corresponding to 9.7 fb$$^{-1}$$ of integrated luminosity recorded with the D0 detector at the Fermilab Tevatron Collider. We consider final states containing a lepton and at least three jets. The polarization is measured through the distribution of lepton angles along three axes: the beam axis, the helicity axis, and the transverse axis normal to the $$t\bar{t}$$ production plane. This is the first measurement of top quark polarization at Tevatron using lepton+jet final states and the first measurement of the transverse polarization in $$t\bar{t}$$ production. The observed distributions are consistent with standard model predictions of nearly no polarization.
- Research Organization:
- Fermi National Accelerator Lab. (FNAL), Batavia, IL (United States)
- Sponsoring Organization:
- USDOE Office of Science (SC), High Energy Physics (HEP)
- Contributing Organization:
- D0
- DOE Contract Number:
- AC02-07CH11359
- OSTI ID:
- 1354874
- Report Number(s):
- arXiv:1702.05026; FERMILAB-CONF-17-098-E; 1513786
- Resource Relation:
- Conference: 9th International Workshop on Top Quark Physics, Olomouc, Czech Republic, 09/19-09/23/2016
- Country of Publication:
- United States
- Language:
- English
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