Measurement of the forward-backward asymmetry in top quark-antiquark production in ppbar collisions using the lepton+jets channel
V.M. Abazov
,
G. Sajot
(1)
,
J. Stark
(1)
,
S. Greder
(2)
,
F. Miconi
(2)
,
I. Ripp-Baudot
(2)
,
G. Grenier
(3)
,
T. Kurca
(3)
,
P. Lebrun
(3)
,
F. Badaud
(4)
,
Ph. Gris
(4)
,
J.-F. Grivaz
(5)
,
T. Guillemin
(5)
,
M. Jaffré
(5)
,
P. Pétroff
(5)
,
M.-C. Cousinou
(6)
,
A. Duperrin
(6)
,
W. Geng
(6)
,
E. Kajfasz
(6)
,
S. Kermiche
(6)
,
E. Nagy
(6)
,
N. Osman
(6)
1
LPSC -
Laboratoire de Physique Subatomique et de Cosmologie
2 DRS-IPHC - Département Recherches Subatomiques
3 IPNL - Institut de Physique Nucléaire de Lyon
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 LAL - Laboratoire de l'Accélérateur Linéaire
6 CPPM - Centre de Physique des Particules de Marseille
2 DRS-IPHC - Département Recherches Subatomiques
3 IPNL - Institut de Physique Nucléaire de Lyon
4 LPC - Laboratoire de Physique Corpusculaire - Clermont-Ferrand
5 LAL - Laboratoire de l'Accélérateur Linéaire
6 CPPM - Centre de Physique des Particules de Marseille
V.M. Abazov
- Function : Author
P. Lebrun
- Function : Author
- PersonId : 741027
- IdHAL : patrice-jean-marie-lebrun
- ORCID : 0000-0001-6115-5856
E. Kajfasz
- Function : Author
- PersonId : 742630
- IdHAL : eric-kajfasz
- ORCID : 0000-0002-8575-405X
- IdRef : 150389043
Abstract
We present a measurement of the forward--backward asymmetry in top quark-antiquark production using the full Tevatron Run II dataset collected by the D0 experiment at Fermilab. The measurement is performed in lepton+jets final states using a new kinematic fitting algorithm for events with four or more jets and a new partial reconstruction algorithm for events with only three jets. Corrected for detector acceptance and resolution effects, the asymmetry is evaluated to be 10.6+-3.0 %. Results are consistent with the standard model predictions which range from 5.0% to 8.8%. We also present the dependence of the asymmetry on the invariant mass of the top quark--antiquark system and the difference in rapidities of top quark and antiquark.