Double parton distribution of valence quarks in the pion in chiral quark models
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Broniowski, W., & Arriola, E. R. (2020). Double parton distribution of valence quarks in the pion in chiral quark models. Physical Review D, 101(1), 014019.
SponsorshipThis research was supported by the Polish National Science Centre (NCN) Grant No. 2018/31/B/ST2/01022, the Spanish Ministerio de Economia y Competitividad and European FEDER funds (Grant No. FIS2017-85053-C2-1- P), and Junta de Andalucía Grant No. FQM-225.
The valence double parton distribution of the pion is analyzed in the framework of chiral quark models, where in the chiral limit factorization between the longitudinal and transverse degrees of freedom occurs. This feature leads, at the quark-model scale, to a particularly simple distribution of the form D (x1, x2, q) = δ (1 − x1 − x2)F(q), where x1,2 are the longitudinal momentum fractions carried by the valence quark and antiquark and q is their relative transverse momentum. For q = 0 this result complies immediately with the Gaunt-Sterling sum rules. The Dokshitzer-Gribov-Lipatov-Altarelli-Parisi (DGLAP) evolution to higher scales is carried out in terms of the Mellin moments. We then explore its role on the longitudinal correlation quantified with the ratio of the double distribution to the product of single distributions, D (x1, x2, q = 0) / D(x1) D(x2). We point out that the ratios of moments (xn1 xm2)/(xn1)(xm2) are independent of the evolution, providing particularly suitable measures to be tested in the upcoming lattice simulations. The transverse form factor F(q) and its Fourier conjugate in the relative transverse coordinate b are obtained in variants of the Nambu–Jona-Lasinio model with the spectral and Pauli-Villars regularizations. The results are valid in the soft-momentum domain. Interestingly, with the spectral regularization of the model, the effective cross section for the double parton scattering of pions is exactly equal to the geometric cross section, σeff = π(b2), and yields about 20 mb.