Measurement of top quark polarization in tt¯ lepton+jets final states

0484249 - FZÚ 2018 RIV US eng J - Článek v odborném periodiku
Abazov, V. M. - Abbott, B. - Acharya, B.S. - Kupčo, Alexander - Lokajíček, Miloš … celkem 371 autorů
Measurement of top quark polarization in tt¯ lepton+jets final states.
Physical Review D. Roč. 95, č. 1 (2017), s. 1-9, č. článku 011101. ISSN 2470-0010. E-ISSN 2470-0029
Grant CEP: GA MŠMT LM2015068; GA MŠMT(CZ) LG15047
Institucionální podpora: RVO:68378271
Klíčová slova: Batavia TEVATRON Coll * DZERO * helicity * experimental results * 1960 GeV-cms
Obor OECD: Particles and field physics
Impakt faktor: 4.394, rok: 2017

We present a measurement of top quark polarization in tt¯ pair production in pp¯ collisions at 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 tt¯ production plane. This is the first measurement of top quark polarization at the Tevatron using lepton+jet final states and the first measurement of the transverse polarization in tt¯ production. The observed distributions are consistent with standard model predictions of nearly no polarization.

Trvalý link: http://hdl.handle.net/11104/0279381