First Extraction of Transversity from a Global Analysis of Electron-Proton and Proton-Proton Data.

Phys Rev Lett

INFN Sezione di Pavia, Via Bassi 6, I-27100 Pavia, Italy.

Published: May 2018

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.

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http://dx.doi.org/10.1103/PhysRevLett.120.192001DOI Listing

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