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Prospects of Direct Determination of |V\_tq| CKM Matrix Elements at the LHC

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(Nov 30, 2012)

Abstract

The prospects of measuring the CKM matrix elements |V\_tq| with top quarks decays at the LHC are discussed here, with the top quarks produced in the processes pp ttbarX and pp t/tbarX, and the subsequent decays t Ws and/or tbar Wsbar. As for the direct measurement of |V\_tb|, there is also a lot of interest in the direct measurements of |V\_ts| and |V\_td|, as the absolute values of these CKM matrix elements can be modified by approximately a factor 2 from their SM values. Direct determination of these matrix elements will require a good tagging of the t s transition (for |V\_ts|) and t d transition (for |V\_td|) in the top quark decays, and a very large top quark statistics, which is available at the LHC. Lacking a good tagging for the t d transition, and also because of the small size of the CKM-matrix element, |V\_td| = O(10^-2), direct measurements of |V\_ts| at the LHC with main emphasis at the centre of mass energy sqrt(s) of 14 TeV/c^2 based on the PLB paper of Ali et al. 1 are shown. Alternative methods for direct |V\_tq| determination at the LHC are also reported.

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