Azimuthal Asymmetries in Unpolarised Semi-Inclusive DIS at COMPASS
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arXiv
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| Format: | Preprint |
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2022
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| _version_ | 1866918497222656000 |
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| author | Matousek, Jan |
| author_facet | Matousek, Jan |
| contents | In semi-inclusive deep inelastic scattering (SIDIS) the non-zero transverse momentum of partons induces azimuthal dependence of the cross-section. For unpolarised nucleon, three azimuthal modulations that can be related to different combinations of twist-two or higher twist transverse momentum dependent PDFs and fragmentation functions arise: the so-called Cahn effect reflected in $\cosϕ_\mathrm{h}$ modulation, the $\cos2ϕ_\mathrm{h}$ term related to the Boer--Mulders PDF and $\sinϕ_\mathrm{h}$ twist-three effect known as beam-spin asymmetry. In 2016 and 2017, the COMPASS experiment at CERN collected a large sample of SIDIS events using a longitudinally polarised 160~GeV/$c$ muon beam scattering on a liquid hydrogen target. Amplitudes of the aforementioned azimuthal modulations have been extracted from part of the data. A new procedure has been developed to subtract a background coming from the decay of diffractively produced vector mesons. The results presented in this talk qualitatively agree with earlier COMPASS results obtained with an isoscalar target. |
| format | Preprint |
| id |
arxiv_https___arxiv_org_abs_2201_05205 |
| institution | arXiv |
| publishDate | 2022 |
| record_format | arxiv |
| spellingShingle | Azimuthal Asymmetries in Unpolarised Semi-Inclusive DIS at COMPASS Matousek, Jan High Energy Physics - Experiment In semi-inclusive deep inelastic scattering (SIDIS) the non-zero transverse momentum of partons induces azimuthal dependence of the cross-section. For unpolarised nucleon, three azimuthal modulations that can be related to different combinations of twist-two or higher twist transverse momentum dependent PDFs and fragmentation functions arise: the so-called Cahn effect reflected in $\cosϕ_\mathrm{h}$ modulation, the $\cos2ϕ_\mathrm{h}$ term related to the Boer--Mulders PDF and $\sinϕ_\mathrm{h}$ twist-three effect known as beam-spin asymmetry. In 2016 and 2017, the COMPASS experiment at CERN collected a large sample of SIDIS events using a longitudinally polarised 160~GeV/$c$ muon beam scattering on a liquid hydrogen target. Amplitudes of the aforementioned azimuthal modulations have been extracted from part of the data. A new procedure has been developed to subtract a background coming from the decay of diffractively produced vector mesons. The results presented in this talk qualitatively agree with earlier COMPASS results obtained with an isoscalar target. |
| title | Azimuthal Asymmetries in Unpolarised Semi-Inclusive DIS at COMPASS |
| topic | High Energy Physics - Experiment |
| url | https://arxiv.org/abs/2201.05205 |