Abstract
We present the first extraction of the transversity distribution in the framework of collinear factorization based on the global analysis of pion-pair production in deep-inelastic scattering and in proton-proton collisions with a transversely polarized proton. The extraction relies on the knowledge of dihadron fragmentation functions, which are taken from the analysis of electron-positron annihilation data. For the first time, the transversity is extracted from a global analysis similar to what is usually done for the spin-averaged and helicity distributions. The knowledge of transversity is important for, among other things, detecting possible signals of new physics in high-precision low-energy experiments.
Highlights
Parton distribution functions (PDFs) describe the internal structure of hadrons in terms of number densities of confined quarks and gluons
We present the first extraction of the transversity distribution in the framework of collinear factorization based on the global analysis of pion-pair production in deep-inelastic scattering and in proton-proton collisions with a transversely polarized proton
The knowledge of PDFs is crucial for the interpretation of high-energy experiments involving hadrons and for detecting signals of new physics beyond the standard model (BSM)
Summary
Parton distribution functions (PDFs) describe the internal structure of hadrons in terms of number densities of confined quarks and gluons. Transversity was extracted for the first time from data on single-particle semi-inclusive DIS (SIDIS) [8] where the cross section contains an azimuthal modulation proportional to the convolution h1 ⊗ H⊥1 involving the chiral-odd Collins fragmentation function H⊥1 [9].
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