Kinked tracks from ${\Sigma }^{+}$ baryons as a probe of light quark polarizations

Abstract

Jets initiated by energetic quarks carry in an obvious way approximate information about the original quark energy and momentum. In a less obvious way, they also carry information about the quark polarization. Previous works have shown how the polarization information can be extracted by ATLAS and CMS using events in which the quark hadronizes to an energetic baryon - ${\Lambda }_b$ for $b$ quarks, ${\Lambda }_c$ for $c$ quarks and $\Lambda$ for $s$ quarks. In this paper we extend these proposals to ${\Sigma }^{+}$ baryons, which can provide sensitivity to polarizations of $s$ and $u$ quarks. We analyze the various aspects of how the kinked track signature of the ${\Sigma }^{+}\to p{\pi }^0$ decay can be used for this purpose. We evaluate the feasibility of such measurements in $t\bar{t}$ samples.

arXiv comment18 pages; v2: minor improvements of presentation; published version

References in corpus (38)

• Description and performance of track and primary-vertex reconstruction with the CMS tracker
• The complete tree-level result up to order $1/Q$ for polarized deep-inelastic leptoproduction
• The Spin Structure of the Nucleon
• Models for the Polarized Parton Distributions of the Nucleon
• Extraction of Spin-Dependent Parton Densities and Their Uncertainties
• A first unbiased global determination of polarized PDFs and their uncertainties
• Nucleon Helicity and Transversity Parton Distributions from Lattice QCD
• Energy calibration and resolution of the CMS electromagnetic calorimeter in pp collisions at sqrt(s) = 7 TeV
• QCD Analysis of Unpolarized and Polarized Lambda - Baryon Production in Leading and Next-to-Leading Order
• Complete flavor decomposition of the spin and momentum fraction of the proton using lattice QCD simulations at physical pion mass
• Production, Decay, and Polarization of Excited Heavy Hadrons
• Combined analysis of charm-quark fragmentation-fraction measurements
• Asymmetry of Lambda Baryons in Hadronic Z^0 Decays
• Polarized $q\to \Lambda$ Fragmentation Functions from $e^{+}{e}^{-}\to \Lambda +X^{\ast }$
• Polarized Lambdas in the Current Fragmentation Region
• Next-to-Leading Order Evolution of Polarized and Unpolarized Fragmentation Functions
• Discovering anomaly-mediated supersymmetry at the LHC
• Fragmentation fractions of c and b quarks into charmed hadrons at LEP
• Lambda polarization from unpolarized quark fragmentation
• Spin content of Lambda and its longitudinal polarization in $e^{+}{e}^{-}$ annihilation at high energies
• One-Loop QCD Mass Effects in the Production of Polarized Bottom and Top Quarks
• The Flavor and Spin Structure of Hyperons from Quark Fragmentation
• ${\Lambda }_c^{\pm }$ production in pp collisions with a new fragmentation function
• A Feynman-Hellmann approach to the spin structure of hadrons
• $\Lambda$, $\bar{\Lambda }$ Polarization and Spin Transfer in Lepton Deep-Inelastic Scattering
• Expected Polarization of $\Lambda$ particles produced in deep inelastic polarized lepton scattering
• Heavy baryons as polarimeters at colliders
• A lattice study of the spin structure of the Lambda hyperon
• Quark Distributions of Octet Baryons from SU(3) Symmetry
• Statistical approach for unpolarized fragmentation functions for the octet baryons
• Connection between Distribution and Fragmentation Functions
• Stau Kinks at the LHC
• Quark to $\Lambda$-hyperon spin transfers in the current-fragmentation region
• $q\to \Lambda$ Fragmentation Function and Nucleon Transversity Distribution in a Diquark Model
• Quark Fragmentation Functions in a Diquark Model for $\Lambda$ Production
• Measuring polarization of light quarks at ATLAS and CMS
• Measuring c-quark polarization in W+c samples at ATLAS and CMS
• Octet Quark Contents from SU(3) Flavor Symmetry

Cited by in corpus (2)

• Prospects for measuring quark polarization and spin correlations in $b\bar{b}$ and $c\bar{c}$ samples at the LHC
• From strange-quark tagging to fragmentation tagging with machine learning