Seminar of the department “Theory of Fundamental Interactions”

Date and Time: Wednesday, 27 January 2021, at 2:30 PM

Venue: online seminar on Zoom, Bogoliubov Laboratory of Theoretical Physics

Seminar topic: «New study of the Boer-Mulders function: Implications for the quark and hadron transverse momenta»

Authors: E. Christova, E. Leader and D. Kotlorz (BLTP and Opole University of Technology)

Speaker: D. Kotlorz

Abstract:

In a combined analysis of the cosϕh and cos2ϕ_h azimuthal asymmetries in unpolarized SIDIS, measured most recently by COMPASS we determined the BM function f^QV_BM(x_B, Q²) for the sum of the valence quarks Q_V=u_V+d_V and obtained information on the average transverse momenta ⟨k²⟩ and ⟨p²⟩ which play a role in the transverse momentum dependent parton distribution functions and fragmentation functions, respectively. The analysis is based on a study of the so-called difference asymmetries between hadron h and h. Our results agree with those obtained from an analysis of DY processes but disagree strongly with the results obtained in a model analysis of the cos2ϕ_h asymmetry in SIDIS incorporating the simplifying assumption that BM function is proportional to the Sivers function for each quark flavor separately.