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Measurement of the W boson helicity in top quark decays using 5.4  fb-1 of pp̅ collision data

Research output: Contribution to journalJournal article

Published

Article number032009
Journal publication date18/02/2011
JournalPhysical Review D
Journal number3
Volume83
Number of pages18
Original languageEnglish

Abstract

We present a measurement of the helicity of the W boson produced in top quark decays using tt̅ decays in the ℓ+jets and dilepton final states selected from a sample of 5.4  fb-1 of collisions recorded using the D0 detector at the Fermilab Tevatron pp̅ collider. We measure the fractions of longitudinal and right-handed W bosons to be f0=0.669±0.102[±0.078(stat.)±0.065(syst.)] and f+=0.023±0.053[±0.041(stat.)±0.034(syst.)], respectively. This result is consistent at the 98% level with the standard model. A measurement with f0 fixed to the value from the standard model yields f+=0.010±0.037[±0.022(stat.)±0.030(syst.).].

Bibliographic note

© 2011 American Physical Society