Bessel weighted asymmetries

Harut Avakian, Leonard Gamberg, Patrizia Rossi, Alexei Prokudin

Research output: Contribution to journalConference article

Abstract

We review the concept of Bessel weighted asymmetries for semi-inclusive deep inelastic scattering and focus on the cross section in Fourier space, conjugate to the outgoing hadron's transverse momentum, where convolutions of transverse momentum dependent parton distribution functions and fragmentation functions become simple products. Individual asymmetric terms in the cross section can be projected out by means of a generalized set of weights involving Bessel functions. The procedure is applied to studies of the double longitudinal spin asymmetry in semi-inclusive deep inelastic scattering using a new dedicated Monte Carlo generator which includes quark intrinsic transverse momentum within the generalized parton model. We observe a few percent systematic offset of the Bessel-weighted asymmetry obtained from Monte Carlo extraction compared to input model calculations, which is due to the limitations imposed by the energy and momentum conservation at the given energy and hard scale Q2. We find that the Bessel weighting technique provides a powerful and reliable tool to study the Fourier transform of TMDs with controlled systematics due to experimental acceptances and resolutions with different TMD model inputs.

Original languageEnglish (US)
Article number42
JournalProceedings of Science
Volume26-30-May-2015
Publication statusPublished - Jan 1 2015
Event2015 QCD Evolution, QCDEV 2015 - Newport News, United States
Duration: May 26 2015May 30 2015

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All Science Journal Classification (ASJC) codes

  • General

Cite this

Avakian, H., Gamberg, L., Rossi, P., & Prokudin, A. (2015). Bessel weighted asymmetries. Proceedings of Science, 26-30-May-2015, [42].