Measuring c-quark polarization in W c samples at ATLAS and CMSReport as inadecuate

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Journal of High Energy Physics

, 2016:11

First Online: 02 November 2016Received: 12 July 2016Revised: 26 September 2016Accepted: 25 October 2016 Abstract

The process pp → Wc produces polarized charm quarks. The polarization is expected to be partly retained in Λc baryons when those form in the c-quark hadronization. We argue that it will likely be possible for ATLAS and CMS to measure the Λc polarization in the W +c samples in Run 2 of the LHC. This can become the first measurement ever of a longitudinal polarization of charm quarks. Its results will provide a unique input to the understanding of polarization transfer in fragmentation. They will also allow applying the same measurement technique to other e.g., new physics samples of charm quarks in which the polarization is a priori unknown. The proposed analysis is similar to the ATLAS and CMS measurements of the W +c cross section in the 7 TeV run that used reconstructed D-meson decays for charm tagging.

KeywordsCharm physics Hadron-Hadron scattering experiments Heavy quark production Polarization proton-proton scattering ArXiv ePrint: 1512.00438

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Author: Yevgeny Kats


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