TMDs: Towards a Synergy between Lattice QCD and Global Analysis

Session

Session IV

21 Jun 2023, 16:00

Center for Frontiers in Nuclear Science, Stony Brook University

14. Disentangling long and short distances in momentum-space TMDs

Zhiquan Sun (MIT)

21/06/2023, 16:00

The extraction of nonperturbative TMD physics is made challenging by prescriptions that shield the Landau pole, which entangle long- and short-distance contributions in momentum space. The use of different prescriptions then makes the comparison of fit results for underlying nonperturbative contributions not meaningful on their own. We propose a model-independent method to restrict...

2. the role of fragmentation measurements for TMD extractions

Ralf Seidl (RIKEN)

21/06/2023, 16:30

TMD extractions of Semi-inclusive DIS measurements and in part hadronic collision measurements rely on the knowledge of (TMD) fragmentation functions in order to successfully obtain TMD distribution functions. There exists some access to unpolarized TMD fragmentation functions via SIDIS measurements, but the cleanest approach is via electron-positron annihilation. It is also the only current...

6. Transverse $\Lambda$ polarization in $e^+e^−$ annihilation and SIDIS processes within a TMD framework

Prof. Umberto D'Alesio (University and INFN Cagliari)

21/06/2023, 17:00

We present an updated analysis of Belle data for the transverse $\Lambda$ polarization in $e^+e^−$ annihilation processes within a TMD factorization approach. $SU(2)$ isospin symmetry and charm quark contribution, with their impact on the description of the experimental data as well as on the extraction of the polarizing fragmentation functions, will be discussed.
Predictions for SIDIS...

8. QCD Global Analysis of (Single-Hadron Fragmentation) Transverse Single-Spin Asymmetries: the Role of Lattice QCD in Phenomenology

Daniel Pitonyak (Lebanon Valley College)

22/06/2023, 16:00

I will report on a recent QCD global analysis of single-spin asymmetries involving observables where single-hadron fragmentation is relevant. This includes measurements of the Sivers, Collins, and \sin(\phi_S) effects in SIDIS, Collins effect in electron-positron annihilation, Sivers effect in Drell-Yan, and AN in single-inclusive proton-proton collisions, which are sensitive to important TMD...

1. Simultaneous Global Analysis of Dihadron Fragmentation Functions and Transversity PDFs

Christopher Cocuzza (Temple University)

22/06/2023, 16:30

We propose a new definition of unintegrated dihadron fragmentation functions (DiFFs) which is compatible with the probability interpretation of collinear DiFFs and derive the leading-order evolution equations for these DiFFs. With these new definitions, we perform the first simultaneous extraction of DiFFs and transversity PDFs using data from semi-inclusive annihilation (SIA) in...