Boer-Mulders function of the pion and the 
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-weighted 
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 asymmetry in the unpolarized 
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Wang, Zhengxian; Wang, Xiaoyu; Lü, Zhun

doi:10.1103/physrevd.95.094004

Cited by 14 publications

(4 citation statements)

References 70 publications

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“…Physically, this is equivalent to taking into account the initial-or the final-state interactions of the active quark with the target remnant. This has been referred collectively as gluon rescattering karnel Gðx; k − k 0 Þ [113,117,165], and one defines the Boer-Mulders function in such a way that where perturbative Abelian gluon rescattering kernel is given by [165,166] iGðx;…”

Section: Transverse Momentum-dependent Parton Distributionsmentioning

confidence: 99%

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Tomography of light mesons in the light-cone quark model

et al. 2020

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We investigate the tomographical structure of the pion and kaon in the light-cone quark model. In particular, we study the parton distribution amplitude (PDA) of the pion and kaon. We obtain the parton distribution function (PDF) and the generalized parton distributions of the pion and kaon. The valence quark PDA and PDF of the pion, after QCD evolution, are found to be consistent with the data from the E791 and the E615 experiments at Fermilab, respectively. Further, we investigate the transverse momentum distributions (TMDs) of the pion and kaon. We also discuss the unpolarized TMD evolution for the pion and kaon in this model.

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Section: Transverse Momentum-dependent Parton Distributionsmentioning

confidence: 99%

“…[167], much larger values of α s , α s ¼ 1.2 and α s ¼ 0.911, have been preferred for use in Refs. [113,166], respectively. The use of such large values of α s contradicts the weak coupling hypothesis leading to the perturbative kernel.…”

Section: Transverse Momentum-dependent Parton Distributionsmentioning

confidence: 99%

Tomography of light mesons in the light-cone quark model

et al. 2020

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“…The TMD-factorization theorem has been proven for SIDIS and DY cross-sections [1], allowing for the interpretation of the TSAs as convolutions of TMD PDFs and TMD fragmentation functions in the case of SIDIS, or nucleon and incoming hadron TMD PDFs in the case of DY. The idea of weighted TSAs was first brought up in the context of SIDIS [2,3], and then ported to DY as well [6,7]. In both SIDIS and DY processes, in order to extract the TMD PDFs they have to be decomposed from the convolution integrals.…”

Section: Introductionmentioning

confidence: 99%

Measurement of $q_T$-weighted transverse-spin-dependent azimuthal asymmetries at COMPASS

Longo¹

2019

Proceedings of XXVII International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2019)

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COMPASS is a fixed-target experiment in operation at the CERN North Area (SPS, M2 beamline) since 2002. An important part of the broad physics programme of the experiment is dedicated to the exploration of the transverse spin-structure of the nucleon studying target transverse spin dependent azimuthal asymmetries (TSAs) arising in the Semi-Inclusive DIS (SIDIS) and Drell-Yan (DY) cross-sections. In addition to those measurements, COMPASS has recently studied also the TSAs weighted by powers of the hadron transverse momentum (in SIDIS) and virtual photon transverse momentum, q T (in DY). In the transverse momentum dependent (TMD) QCD approach, the conventional DY TSAs are interpreted as convolutions of the beam pion and of the transversely polarized target proton TMD parton distribution functions (PDFs), while the q Tweighted TSAs can be interpreted as simple products of transverse moments of the TMD PDFs. In 2015 and 2018 COMPASS performed two years of Drell-Yan data taking with a 190 GeV/c π − beam impinging on a transversely polarized NH 3 target. The analysis of the q T weighted TSAs performed on these two data sets is presented in this paper. The results for DY Sivers q T weighted TSA are compared with the expectations based on the studies of the weighted Sivers asymmetry measured in the SIDIS process. Combining the information from SIDIS and DY measurements, the pion Boer-Mulders TMD PDF is also studied.

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“…The idea of weighted transverse spin azimuthal asymmetries (TSAs) appeared first in the context of SIDIS [1,2], but it is used in DY as well [3,4]. Their advantage is that the convolutions of the TMD PDFs, which are present in the standard interpretation of the SIDIS or DY cross-sections and consequently in the standard TSAs, are replaced by products of transverse moments of the TMD PDFs.…”

Section: Introductionmentioning

confidence: 99%

Weighted transverse spin asymmetries in 2015 COMPASS Drell-Yan data

Matoušek¹

2019

Proceedings of 23rd International Spin Physics Symposium — PoS(SPIN2018)

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Muon pairs created in the Drell-Yan process of a negative pion beam of 190 GeV/c momentum impinging on a transversely polarised NH 3 target were detected with the COMPASS spectrometer at CERN in 2015. In addition to the extraction of the transverse spin asymmetries (TSAs) from these data, a complementary analysis of the TSAs weighted by powers of the dimuon momentum q T has been performed and is presented in this paper. In the transverse momentum dependent parton distribution functions (TMD PDFs) formalism, the q T -weighted TSAs can be interpreted in terms of products of the TMD PDFs of the beam pion and of the transversely polarised target proton, unlike the conventional TSAs, which are interpreted as their convolutions. This allowed us to make a straightforward comparison with the expectation based on the weighted Sivers asymmetry measured in the SIDIS process. In a similar way, the Boer-Mulders function of the pion and proton can be obtained as well. Transverse momentum weighted asymmetries in Drell-Yan processWe studied the DY reaction π − p ↑ → µ − µ + X with a 190 GeV/c π − beam and a transversely polarised proton target. At leading order (LO), the reaction proceeds via annihilation of a quark-antiquark pair into a virtual photon. The cross-section consists of five terms, each 1 arXiv:1812.08505v1 [hep-ex]

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Boer-Mulders function of the pion and the qT -weighted cos2φ asymmetry in the unpolarized

Cited by 14 publications

References 70 publications

Tomography of light mesons in the light-cone quark model

Tomography of light mesons in the light-cone quark model

Measurement of $q_T$-weighted transverse-spin-dependent azimuthal asymmetries at COMPASS

Weighted transverse spin asymmetries in 2015 COMPASS Drell-Yan data

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