Overview of Spin Physics at EIC

Boer, Daniël

doi:10.22323/1.346.0167

Cited by 3 publications

(2 citation statements)

References 71 publications

(85 reference statements)

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“…[22]). Also, there are efforts to measure the deuteron b 1 via the proton-deuteron Drell-Yan process (conditionally approved proposal at JLab Hall C [23] and feasibility studies for Fermilab [22,24]), as well as discussions of a measurement via DIS at the EIC [25].…”

Section: Introductionmentioning

confidence: 99%

Mellin moments of spin dependent and independent PDFs of the pion and rho meson

Löffler,

Wein,

Wurm

et al. 2021

Preprint

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We compute the second moments of pion and rho parton distribution functions (PDFs) in lattice QCD with N f = 2 + 1 flavors of improved Wilson fermions. We determine both singlet and nonsinglet flavor combinations and, for the first time, take disconnected contributions fully into account. In the case of the rho, we also calculate the additional contribution arising from the b1 structure function. The numerical analysis includes 26 ensembles, mainly generated by the CLS effort, with pion masses ranging from 420 MeV down to 214 MeV and with 5 different lattice spacings in the range of 0.1 fm to 0.05 fm. This enables us to take the continuum limit, as well as to resolve the quark mass dependencies reliably. Additionally we discuss the contaminations of rho correlation functions by two-pion states.

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Section: Introductionmentioning

confidence: 99%

Mellin moments of spin dependent and independent PDFs of the pion and rho meson

Löffler,

Wein,

Wurm

et al. 2021

Preprint

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“…Going beyond helicity distributions and entering the realm of the 3D momentum space spin structure brings in many new spin-sensitive variables, which can be encoded via transverse-momentum distributions and explored experimentally in semi-inclusive DIS with transversely polarized protons [9,10]. The recently approved Electron Ion Collider in the US [11] and the proposed Electron Ion Collider in China [12] also have a rich spin physics program ahead.…”

Section: Introductionmentioning

confidence: 99%

Twisted particle collisions: a new tool for spin physics

Ivanov,

Korchagin,

Pimikov

et al. 2020

Preprint

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Collisions of twisted particles -that is, non-plane-wave states of photons, electrons, or any other particle, equipped with a non-zero orbital angular momentum (OAM) with respect to its propagation direction -offer novel ways to probe particle structure and interactions. In the recent paper [1], we argued that resonance production in twisted photon collisions or twisted e + e − annihilation gives access to parity-and spin-sensitive observables in inclusive cross sections, even when the initial particles are unpolarized. Here, we explore these features in detail, providing a qualitative picture and illustrating it with numerical examples. We show how one can detect parity-violating effects in collisions of unpolarized twisted photons and how one can produce almost 100% polarized vector mesons in unpolarized twisted e + e − annihilation. These examples highlight the unprecedented level of control over polarization offered by twisted particles, impossible in the usual plane wave collisions.

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