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Model-independent measurement of the W-boson helicity in top-quark decays at D0.

Abstract:

We present the first model-independent measurement of the helicity of W bosons produced in top quark decays, based on a 1 fb(-1) sample of candidate tt events in the dilepton and lepton plus jets channels collected by the D0 detector at the Fermilab Tevatron pp Collider. We reconstruct the angle theta(*) between the momenta of the down-type fermion and the top quark in the W boson rest frame for each top quark decay. A fit of the resulting costheta(*) distribution finds that the fraction of l...

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Journal:
Physical Review Letters More from this journal
Volume:
100
Issue:
6
Pages:
062004
Publication date:
2008-02-01
DOI:
EISSN:
1079-7114
ISSN:
0031-9007
Language:
English
Keywords:
Pubs id:
pubs:180048
UUID:
uuid:b60c947b-62a7-4642-a0be-81377ad90000
Local pid:
pubs:180048
Source identifiers:
180048
Deposit date:
2012-12-19

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