Polarization of top quark as a probe of its chromomagnetic and chromoelectric couplings in tW production at the Large Hadron ColliderReport as inadecuate




Polarization of top quark as a probe of its chromomagnetic and chromoelectric couplings in tW production at the Large Hadron Collider - Download this document for free, or read online. Document in PDF available to download.

Journal of High Energy Physics

, 2015:180

First Online: 27 October 2015Received: 04 August 2015Accepted: 25 September 2015 Abstract

We study the sensitivity of the Large Hadron Collider LHC to top quark chromomagnetic CMDM and chromoelectric CEDM dipole moments and W tb effective couplings in single-top production in association with a W boson, followed by semileptonic decay of the top. The W t single-top production mode helps to isolate the anomalous ttg and W tb couplings, in contrast to top-pair production and other single-top production modes, where other new-physics effects can also contribute. We calculate the top polarization and the effects of these anomalous couplings on it at two centre-of-mass cm energies, 8 TeV and 14 TeV. As a measure of top polarization, we look at decay-lepton angular distributions in the laboratory frame, without requiring reconstruction of the rest frame of the top, and study the effect of the anomalous couplings on these distributions. We construct certain asymmetries to study the sensitivity of these distributions to top-quark couplings. We determine individual limits on the dominant couplings, viz., the real part of the CMDM Reρ2, the imaginary part of the CEDM Imρ3, and the real part of the tensor W tb coupling Ref2R, which may be obtained by utilizing these asymmetries at the LHC. We also obtain simultaneous limits on pairs of these couplings taking two couplings to be non-zero at a time.

KeywordsHeavy Quark Physics CP violation ArXiv ePrint: 1507.08385

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Author: Saurabh D. Rindani - Pankaj Sharma - Anthony W. Thomas

Source: https://link.springer.com/



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