CosϕR asymmetry of dihadron production in double longitudinally polarized SIDIS

Abstract

We present a study on the double longitudinal-spin asymmetry of dihadron production in semiinclusive deep inelastic scattering, in which the transverse momentum of the final-state hadron pairs is integrated out. In particular, we investigate the origin of the cos φR azimuthal asymmetry for which we take into account the coupling of the helicity distribution g1 and the twist-3 dihadron fragmentation function D ∢ . We calculate the s-wave and p-wave interference term D ∢ ot in a spectator model. We estimate the cos φR asymmetry at the kinematics of COMPASS which is collecting data on dihadron prouduction in polarized deep inelastic scattering. The prediction of the same asymmetry at JLab 12GeV and a future EIC are also presented. Our study indicates that measuring the cos φR asymmetry in SIDIS may be a ideal way to probe the dihadron fragmentation function D ∢ .

Dispersion-theoretical analysis of the electromagnetic form factors of the $$\Lambda $$ hyperon

“…In the narrow sector, two physical states, the ω and φ mesons, are included as in our previous analyses to the nucleon EMFFs [4,14]. Following the previous studies on the ¯ data in the near-threshold region [30,32,40] and works on the newest BESIII data set around 4 GeV [25,41], the φ(2170) and ψ(3770) states are included in the broad sector. The PDG values [49] for the masses and widths of those physical vector states are used as input in our analysis.…”

“…There has also been increasing interest in the electromagnetic structure of hyperons in the past two decades, both from the experimental [15][16][17][18][19][20][21][22][23][24][25] and theoretical [26][27][28][29][30][31][32][33][34][35][36][37][38][39][40][41] side. Compared to the nucleon, the development of experiments exploring the hyperon EMFFs is somewhat lagging behind since the hyperons are unstable.…”

“…To date, only a subset of these ¯ data has been studied theoretically [29,30,32,[39][40][41]. In particular, the previous near-threshold data were analyzed in Refs.…”

“…Similar interpretations were also investigated in Refs. [32,40] using the vector meson dominance (VMD) parameterization for the EMFFs of the hyperon. In contrast, the work of Ref.…”

Single spin asymmetry AULsin(2ϕh−2ϕR

“…In the literature, the transversity distribution has been extracted from both dihadron SIDIS and proton proton collision data [14][15][16][17][18]. On the other hand, to estimate the magnitudes of various DIFFs, the model predictions of the DiFFs were performed by the spectator model [19][20][21][22][23][24] and by the Nambu-Jona-Lasinio (NJL) quark model [25][26][27][28].…”