The gluon structure of hadrons and nuclei from lattice QCD

Shanahan, Phiala E.

doi:10.1051/epjconf/201817501015

Cited by 4 publications

(4 citation statements)

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“…• Algorithms and Machines (20) • Applications Beyond QCD (14) • Chiral Symmetry (11) • Hadron Spectroscopy and Interactions (41) • Hadron Structure (52) • Nonzero Temperature and Density (63) • Physics Beyond the Standard Model (35) • Software Development (21) • Standard Model Parameters and Renormalization (12) • Theoretical Developments (34)…”

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confidence: 99%

“…Talks dedicated to specific topics ranged from the discussion of B-physics anomalies in the flavour sector [40,41] or the determination of α s from different perspectives [55,56], to the status and evolution of QCD codes for high-performance computing [59], this year with special emphasis on the new KNL architecture (Intel) that will play an important role in the next generation of supercomputers. Progress in the calculation of notoriously difficult quantities like the nucleon axial charge [45], the nucleon EDM [51], the muon anomalous magnetic moment [62,63], or the gluonic structure of nuclei [52] has also been reported. Another topic that has drawn a lot of attention recently is the computation of quasi-parton distribution functions; a plenary session trying to assess the impact of lattice results in this field has been presented during the conference [43].…”

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confidence: 99%

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Preface

Morte¹,

Fritzsch²,

Sánchez³

et al. 2018

EPJ Web Conf.

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confidence: 99%

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confidence: 99%

Preface

Morte¹,

Fritzsch²,

Sánchez³

et al. 2018

EPJ Web Conf.

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“…At large x B , g 1 can be computed using lattice QCD methods [24][25][26][27][28][29]68]. However at small x B , particularly in Regge asymptotics, lattice computations are challenging due to the difficulties posed by i) computing higher moments of local operators, ii) boosting the proton to high energies on the lattice [69].…”

Section: Axion-like Action At Small Xb: Gluon Saturation and Sphalero...mentioning

confidence: 99%

The role of the chiral anomaly in polarized deeply inelastic scattering II: Topological screening and transitions from emergent axion-like dynamics

Tarasov,

Venugopalan

2021

Preprint

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In [1], we demonstrated that structure function g1(xB, Q 2 ) measured in polarized deeply inelastic scattering (DIS) is dominated by the triangle anomaly in both Bjorken (Q 2 → 0) and Regge (xB → 0) asymptotics. In the worldline formulation of quantum field theory, the triangle anomaly arises from the imaginary part of the worldline effective action. We show explicitly how a Wess-Zumino-Witten term coupling the topological charge density to a primordial isosinglet η arises in this framework. We demonstrate the fundamental role played by this contribution both in topological mass generation of the η and in the cancellation of the off-forward pole arising from the triangle anomaly in the proton's helicity Σ(Q 2 ). We recover the striking result by Shore and Veneziano that Σ ∝ χ (0), where χ is the slope of the QCD topological susceptibility in the forward limit. We construct an axion-like effective action for g1 at small xB that describes the interplay between gluon saturation and the topology of the QCD vacuum. In particular, we outline the role of "over-thebarrier" sphaleron-like transitions in spin diffusion at small xB. Such topological transitions can be measured in polarized DIS at a future Electron-Ion Collider., with the ≈ sign denoting that a term needs to be added on the l.h.s corresponding to a linear combination of the isotriplet and isooctet axial vector charges of the proton. These contributions are weakly dependent on Q 2 and we will ignore them henceforth to focus on isosinglet contributions to g 1 (x B , Q 2 ).

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“…It is possible that one of these two roles dominates the gluon parton structure of such hadrons. La ice-QCD calculations of the gluon fraction of the nucleon spin and lightcone momentum are typically 35-50% at scale 2 GeV [4,5,8]. Any gluon emission and absorption process, including dressing of a quark, contributes to the gluon parton density g(x) and modi es the quark part q(x) [9].…”

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confidence: 99%