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Measuring c-quark polarization in W plus c samples at ATLAS and CMS

Author:
Katsi, Yevgeny  


Journal:
JOURNAL OF HIGH ENERGY PHYSICS


Issue Date:
2016


Abstract(summary):

The process pp -> W(-)c produces polarized charm quarks. The polarization is expected to be partly retained in Lambda(c) baryons when those form in the c-quark hadronization. We argue that it will likely be possible for ATLAS and CMS to measure the Lambda(c) 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 7TeV run that used reconstructed D-meson decays for charm tagging.


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