18-22 October 2021
Matsue, Shimane Prefecture, Japan
Asia/Tokyo timezone

Beam spin asymmetries of $\pi^+\pi^0$ and $\pi^-\pi^0$ dihadrons from SIDIS at CLAS12

21 Oct 2021, 08:58
Room 601 (Kunibiki Messe)

Room 601

Kunibiki Messe

Parallel Session Presentation Transverse momentum structure (TMD) Transverse Momentum Structure (TMD)


Christopher Dilks (Duke University)


Spin asymmetries provide a wide range of insights into nucleon structure and
hadronization. Recent measurements of beam spin asymmetries of $\pi^+\pi^-$
dihadrons from SIDIS at CLAS12 provide the first empirical evidence of a nonzero
$G_1^\perp$, the parton helicity-dependent dihadron fragmentation function
(DiFF) encoding spin-momentum correlations in hadronization. These measurements
have been extended to help further characterize $H_1^\perp$ and
$H_1^<$, the DiFFs dependent on parton transverse spin, via a
multidimensional partial wave analysis, giving access to the dependence on the
interference of dihadrons of particular polarizations. Reconstruction of
$\pi^0$s allows for further extension of these measurements to $\pi^+\pi^0$ and
$\pi^-\pi^0$ dihadrons. The DiFFs describing $\pi^+\pi^-$ production differ
from those describing $\pi^+\pi^0$ and $\pi^-\pi^0$ production, which involve
different quark flavors along with a strong suppression of the exclusive
diffractive contribution. This presentation will focus on comparisons of beam
spin asymmetries for these three dihadron flavors, which will help shed light on
a more comprehensive picture of dihadron fragmentation.

Primary author

Christopher Dilks (Duke University)

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