%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 }