### Abstract

The transverse spin asymmetries measured in semi-inclusive leptoproduction of hadrons, when weighted with the hadron transverse momentum P_{T}, allow for the extraction of important transverse-momentum-dependent distribution functions. In particular, the weighted Sivers asymmetries provide direct information on the Sivers function, which is a leading-twist distribution that arises from a correlation between the transverse momentum of an unpolarised quark in a transversely polarised nucleon and the spin of the nucleon. Using the high-statistics data collected by the COMPASS Collaboration in 2010 with a transversely polarised proton target, we have evaluated two types of P_{T}-weighted Sivers asymmetries, which are both proportional to the product of the first transverse moment of the Sivers function and of the fragmentation function. The results are compared to the standard unweighted Sivers asymmetries and used to extract the first transverse moments of the Sivers distributions for u and d quarks.

Original language | English |
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Pages (from-to) | 34-53 |

Number of pages | 20 |

Journal | Nuclear Physics B |

Volume | 940 |

DOIs | |

Publication status | Published - 1 Mar 2019 |

### ASJC Scopus subject areas

- Nuclear and High Energy Physics

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## Cite this

_{T}-weighted Sivers asymmetries in leptoproduction of hadrons.

*Nuclear Physics B*,

*940*, 34-53. https://doi.org/10.1016/j.nuclphysb.2018.12.024