Current methods to extract the quark-mixing matrix element \$|V\_tb|\$ from
single-top production measurements assume that \$|V\_tb||V\_td|,
|V\_ts|\$: top quarks decay into \$b\$ quarks with 100\% branching fraction,
s-channel single-top production is always accompanied by a \$b\$ quark and
initial-state contributions from \$d\$ and \$s\$ quarks in the \$t\$-channel
production of single top quarks are neglected. Triggered by a recent
measurement of the ratio
\$R=|V\_tb|^2|V\_td|^2+|V\_ts|^2+|V\_tb|^2=0.90 0.04\$
performed by the D0 collaboration, we consider a \$|V\_tb|\$ extraction method
that takes into account non zero d- and s-quark contributions both in
production and decay. We propose a strategy that allows to extract consistently
and in a model-independent way the quark mixing matrix elements \$|V\_td|\$,
\$|V\_ts|\$, and \$|V\_tb|\$ from the measurement of \$R\$ and from single-top
measured event yields. As an illustration, we apply our method to the Tevatron
data using a CDF analysis of the measured single-top event yield with two jets
in the final state one of which is identified as a \$b\$-quark jet. We constrain
the \$|V\_tq|\$ matrix elements within a four-generation scenario by combining
the results with those obtained from direct measurements in flavor physics and
determine the preferred range for the top-quark decay width within different
scenarios.
%0 Journal Article
%1 Lacker2012Modelindependent
%A Lacker, H.
%A Menzel, A.
%A Spettel, F.
%A Hirschbühl, D.
%A Lück, J.
%A Maltoni, F.
%A Wagner, W.
%A Zaro, M.
%D 2012
%K top
%T Model-independent extraction of \$|V\_tq|\$ matrix elements from top-quark measurements at hadron colliders
%U http://arxiv.org/abs/1202.4694
%X Current methods to extract the quark-mixing matrix element \$|V\_tb|\$ from
single-top production measurements assume that \$|V\_tb||V\_td|,
|V\_ts|\$: top quarks decay into \$b\$ quarks with 100\% branching fraction,
s-channel single-top production is always accompanied by a \$b\$ quark and
initial-state contributions from \$d\$ and \$s\$ quarks in the \$t\$-channel
production of single top quarks are neglected. Triggered by a recent
measurement of the ratio
\$R=|V\_tb|^2|V\_td|^2+|V\_ts|^2+|V\_tb|^2=0.90 0.04\$
performed by the D0 collaboration, we consider a \$|V\_tb|\$ extraction method
that takes into account non zero d- and s-quark contributions both in
production and decay. We propose a strategy that allows to extract consistently
and in a model-independent way the quark mixing matrix elements \$|V\_td|\$,
\$|V\_ts|\$, and \$|V\_tb|\$ from the measurement of \$R\$ and from single-top
measured event yields. As an illustration, we apply our method to the Tevatron
data using a CDF analysis of the measured single-top event yield with two jets
in the final state one of which is identified as a \$b\$-quark jet. We constrain
the \$|V\_tq|\$ matrix elements within a four-generation scenario by combining
the results with those obtained from direct measurements in flavor physics and
determine the preferred range for the top-quark decay width within different
scenarios.
@article{Lacker2012Modelindependent,
abstract = {Current methods to extract the quark-mixing matrix element \$|V\_{tb}|\$ from
single-top production measurements assume that \$|V\_{tb}|\gg |V\_{td}|,
|V\_{ts}|\$: top quarks decay into \$b\$ quarks with 100\% branching fraction,
s-channel single-top production is always accompanied by a \$b\$ quark and
initial-state contributions from \$d\$ and \$s\$ quarks in the \$t\$-channel
production of single top quarks are neglected. Triggered by a recent
measurement of the ratio
\$R=\frac{|V\_{tb}|^{2}}{|V\_{td}|^{2}+|V\_{ts}|^{2}+|V\_{tb}|^{2}}=0.90 \pm 0.04\$
performed by the D0 collaboration, we consider a \$|V\_{tb}|\$ extraction method
that takes into account non zero d- and s-quark contributions both in
production and decay. We propose a strategy that allows to extract consistently
and in a model-independent way the quark mixing matrix elements \$|V\_{td}|\$,
\$|V\_{ts}|\$, and \$|V\_{tb}|\$ from the measurement of \$R\$ and from single-top
measured event yields. As an illustration, we apply our method to the Tevatron
data using a CDF analysis of the measured single-top event yield with two jets
in the final state one of which is identified as a \$b\$-quark jet. We constrain
the \$|V\_{tq}|\$ matrix elements within a four-generation scenario by combining
the results with those obtained from direct measurements in flavor physics and
determine the preferred range for the top-quark decay width within different
scenarios.},
added-at = {2019-02-23T22:09:48.000+0100},
archiveprefix = {arXiv},
author = {Lacker, H. and Menzel, A. and Spettel, F. and Hirschb\"{u}hl, D. and L\"{u}ck, J. and Maltoni, F. and Wagner, W. and Zaro, M.},
biburl = {https://www.bibsonomy.org/bibtex/2c378a125f7068bcbbc0f924b63cc9803/cmcneile},
citeulike-article-id = {10376326},
citeulike-linkout-0 = {http://arxiv.org/abs/1202.4694},
citeulike-linkout-1 = {http://arxiv.org/pdf/1202.4694},
day = 21,
eprint = {1202.4694},
interhash = {6ef1c164875ad1dd11f64427bf6b449f},
intrahash = {c378a125f7068bcbbc0f924b63cc9803},
keywords = {top},
month = feb,
posted-at = {2012-02-22 08:55:18},
priority = {2},
timestamp = {2019-02-23T22:15:27.000+0100},
title = {Model-independent extraction of \$|V\_{tq}|\$ matrix elements from top-quark measurements at hadron colliders},
url = {http://arxiv.org/abs/1202.4694},
year = 2012
}