Current methods to extract the quark-mixing matrix element pipeVtbpipe from single-top-production measurements assume that pipeVtbpipe>>pipeVtdpipe,pipeVtspipe: 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, 0. 90 ±0. 04 performed by the D0 collaboration, we consider a pipeVtbpipe 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 pipeVtdpipe, pipeVtspipe, and pipeVtbpipe 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 pipeVtqpipe 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. © 2012 Springer-Verlag / Società Italiana di Fisica.

Lacker, H., Menzel, A., Spettel, F., Hirschbühl, D., Lück, J., Maltoni, F., et al. (2012). Model-independent extraction of pipeVtqpipe matrix elements from top-quark measurements at hadron colliders. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 72(6), 1-14 [10.1140/epjc/s10052-012-2048-4].

Model-independent extraction of pipeVtqpipe matrix elements from top-quark measurements at hadron colliders

Maltoni, F.;
2012

Abstract

Current methods to extract the quark-mixing matrix element pipeVtbpipe from single-top-production measurements assume that pipeVtbpipe>>pipeVtdpipe,pipeVtspipe: 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, 0. 90 ±0. 04 performed by the D0 collaboration, we consider a pipeVtbpipe 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 pipeVtdpipe, pipeVtspipe, and pipeVtbpipe 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 pipeVtqpipe 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. © 2012 Springer-Verlag / Società Italiana di Fisica.
2012
Lacker, H., Menzel, A., Spettel, F., Hirschbühl, D., Lück, J., Maltoni, F., et al. (2012). Model-independent extraction of pipeVtqpipe matrix elements from top-quark measurements at hadron colliders. THE EUROPEAN PHYSICAL JOURNAL. C, PARTICLES AND FIELDS, 72(6), 1-14 [10.1140/epjc/s10052-012-2048-4].
Lacker, H.*; Menzel, A.; Spettel, F.; Hirschbühl, D.; Lück, J.; Maltoni, F.; Wagner, W.; Zaro, M.
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Utilizza questo identificativo per citare o creare un link a questo documento: https://hdl.handle.net/11585/659779
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