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High Energy Physics - Phenomenology

arXiv:1505.06731 (hep-ph)
[Submitted on 25 May 2015 (v1), last revised 14 Oct 2015 (this version, v2)]

Title:Measuring polarization of light quarks at ATLAS and CMS

Authors:Yevgeny Kats
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Abstract:Polarization of strange quarks is preserved to a high degree when they hadronize into Lambda baryons, as observed in Z decays at LEP. This opens up the possibility for ATLAS and CMS to use strange-quark polarization measurements as a characterization tool for new physics scenarios that produce such quarks. Measurements in ttbar samples would be useful for obtaining additional information about the polarization transfer from the strange quark to the Lambda baryon. Already with 100/fb in Run 2, ttbar samples in ATLAS and CMS become competitive in sensitivity with the Z samples of the LEP experiments. Moreover, while the LEP measurements were done inclusively over all quark flavors, which makes their interpretation dependent on various modeling assumptions, ttbar events at the LHC offer multiple handles for disentangling the different contributions experimentally. We also discuss the possibility of measuring polarizations of up and down quarks.
Comments: 16 pages; v2: minor improvements, published version
Subjects: High Energy Physics - Phenomenology (hep-ph); High Energy Physics - Experiment (hep-ex)
Cite as: arXiv:1505.06731 [hep-ph]
  (or arXiv:1505.06731v2 [hep-ph] for this version)
  https://doi.org/10.48550/arXiv.1505.06731
Journal reference: Phys. Rev. D 92, 071503 (2015)
Related DOI: https://doi.org/10.1103/PhysRevD.92.071503

Submission history

From: Yevgeny Kats [view email]
[v1] Mon, 25 May 2015 20:00:18 UTC (14 KB)
[v2] Wed, 14 Oct 2015 14:45:13 UTC (16 KB)
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