Measuring quark polarizations at ATLAS and CMS

Research output: Chapter in Book/Report/Conference proceedingConference contributionpeer-review


Being able to measure the polarization of quarks produced in various processes at the LHC would be of fundamental significance. Measuring the polarizations of quarks produced in new physics processes, once discovered, can provide crucial information about the new physics Lagrangian. In a series of recent papers, we have investigated how quark polarization measurements can be done in practice. The polarizations of heavy quarks (b and c) are expected to be largely preserved in the lightest baryons they hadronize into, the Λb and Λc, respectively. Furthermore, it is known experimentally that s-quark polarization is preserved as well, in Λ baryons. We study how ATLAS and CMS can measure polarizations of b, c and s quarks using certain decays of these baryons. We propose to use the Standard Model tt¯ and Wc samples to calibrate these measurements. We estimate that the Run 2 dataset will suffice for measuring the quark polarizations in these Standard Model samples with precisions of order 10%. We also propose various additional measurements for the near and far future that would help characterize the polarization transfer from the quarks to the baryons.

Original languageEnglish
Title of host publicationLFC17
Subtitle of host publicationPhysics Prospects for Linear and other Future Colliders after the Discovery of the Higgs 2017
EditorsGennaro Corcella, Stefania De Curtis, Stefano Moretti, Giulia Pancheri, Roberto Tenchini, Marcel Vos
PublisherIstituto Nazionale di Fisica Nucleare
Number of pages8
ISBN (Electronic)9788886409612
StatePublished - 1 Jan 2017
Event8th Workshop on Old and New Strong Interactions from LHC to Future Colliders, LFC 2017 - Villazzano, Italy
Duration: 11 Sep 201715 Sep 2017

Publication series

NameFrascati Physics Series
ISSN (Print)1122-5157


Conference8th Workshop on Old and New Strong Interactions from LHC to Future Colliders, LFC 2017

ASJC Scopus subject areas

  • Nuclear and High Energy Physics


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