50th International Symposium on Multiparticle Dynamics (ISMD2021)

Session

Hadron structure / Jets & QCD

HS+JETS

14 Jul 2021, 17:15

Conveners

Hadron structure / Jets & QCD

• Claire Gwenlan (University of Oxford (GB))

89. Jet-based TMD measurements with H1 data

Ben Nachman (Lawrence Berkeley National Lab. (US))

14/07/2021, 17:15

Hadron structure

Talk

Recently, jet measurements in DIS events close to Born kinematics have been proposed as a new probe to study transverse-momentum-dependent (TMD) PDFs, TMD fragmentation functions, and TMD evolution. We report measurements of lepton-jet momentum imbalance and hadron-in-jet correlations in high-$Q^2$ DIS events collected with the H1 detector at HERA. The jets are reconstructed with the kT...

125. Measurement of 1-jettiness in deep-inelastic scattering at HERA

Daniel Britzger (Deutsches Elektronen-Synchrotron (DE)), Johannes Hessler (Max-Planck-Institut fur Physik (DE))

14/07/2021, 17:30

Jets and QCD at high scales

Talk

A first measurement of the 1-jettiness event shape observable in neutral-current deep-inelastic electron-proton scattering is presented. The 1-jettiness observable 𝜏1𝑏 is defined such that it is equivalent to the thrust observable in the Breit frame, following momentum conservation. The data were taken with the H1 detector at the HERA ep collider at a center-of-mass energy of 319 GeV in the...

143. NNLO single-top-quark production and decay: Discrepancies resolved, PDFs challenged

Zack Sullivan (Illinois Institute of Technology)

14/07/2021, 17:45

Hadron structure

Talk

We present our recent NNLO calculation of t-channel single-top-quark production and decay that resolves a disagreement between two previous calculations whose size at the inclusive level was comparable to the NNLO correction itself, and was even larger differentially. Moving beyond those comparisons, we have included b-quark tagging to allow for comparison with experiment, and added the...

159. Quark Sivers Function at Small-x: Return of a Spin-Dependent Odderon

M. Gabriel Santiago (Ohio State University)

14/07/2021, 18:00

Hadron structure

Talk

We apply the formalism developed earlier [1, 2] for studying transverse momentum dependent parton distribution functions (TMDs) at small Bjorken $x$ to construct the small-$x$ asymptotics of the quark Sivers function. First, we explicitly construct the complete fundamental “polarized Wilson line” operator to sub-sub-eikonal order. We then express the quark Sivers function in terms of...