Spin density matrix elements in exclusive ω meson muoproduction; European Physical Journal C; Vol. 81, iss. 2
| Parent link: | European Physical Journal C Vol. 81, iss. 2.— 2021.— [126, 22 p.] |
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| Corporate Authors: | , |
| Outros autores: | , , , , , , , , |
| Summary: | Title screen We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive ωω meson muoproduction on the proton at COMPASS using 160 GeV/c polarised μ+ and μ− beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/c2 <W< 17.0 GeV/c2, with the average kinematics ⟨Q2⟩= 2.1 (GeV/c)2, ⟨W⟩=7.6⟨W⟩=7.6 GeV/c2, and ⟨p2T⟩=0.16 (GeV/c)2. Here, Q2 denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and pT the transverse momentum of the ωω meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons (γ∗T→VL) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive ω production. |
| Idioma: | inglés |
| Publicado: |
2021
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| Subjects: | |
| Acceso en liña: | https://doi.org/10.1140/epjc/s10052-020-08740-y |
| Formato: | Electrónico Capítulo de libro |
| KOHA link: | https://koha.lib.tpu.ru/cgi-bin/koha/opac-detail.pl?biblionumber=668070 |
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| 200 | 1 | |a Spin density matrix elements in exclusive ω meson muoproduction |f G. D. Alekseev, M. G. Alekseev, S. V. Donskov [et al.] | |
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| 300 | |a Title screen | ||
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| 330 | |a We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive ωω meson muoproduction on the proton at COMPASS using 160 GeV/c polarised μ+ and μ− beams impinging on a liquid hydrogen target. The measurement covers the range 5.0 GeV/c2 <W< 17.0 GeV/c2, with the average kinematics ⟨Q2⟩= 2.1 (GeV/c)2, ⟨W⟩=7.6⟨W⟩=7.6 GeV/c2, and ⟨p2T⟩=0.16 (GeV/c)2. Here, Q2 denotes the virtuality of the exchanged photon, W the mass of the final hadronic system and pT the transverse momentum of the ωω meson with respect to the virtual-photon direction. The measured non-zero SDMEs for the transitions of transversely polarised virtual photons to longitudinally polarised vector mesons (γ∗T→VL) indicate a violation of s-channel helicity conservation. Additionally, we observe a sizeable contribution of unnatural-parity-exchange (UPE) transitions that decreases with increasing W. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow to evaluate in a model-dependent way the contribution of UPE transitions and assess the role of parton helicity-flip GPDs in exclusive ω production. | ||
| 461 | |t European Physical Journal C | ||
| 463 | |t Vol. 81, iss. 2 |v [126, 22 p.] |d 2021 | ||
| 610 | 1 | |a электронный ресурс | |
| 610 | 1 | |a труды учёных ТПУ | |
| 701 | 1 | |a Alekseev |b G. D. |g Georgy Dmitrievich | |
| 701 | 1 | |a Alekseev |b M. G. |g Maksim | |
| 701 | 1 | |a Donskov |b S. V. |g Sergey Vasiljevich | |
| 701 | 1 | |a Burtsev |b V. E. |c mathematician |c Senior Lecturer of Tomsk Polytechnic University |f 1991- |g Vitaly Evgenjevich |3 (RuTPU)RU\TPU\pers\38282 | |
| 701 | 1 | |a Chumakov |b A. G. |c physicist |c laboratory assistant-researcher of Tomsk Polytechnic University |f 1992- |g Aleksandr Grigorjevich |3 (RuTPU)RU\TPU\pers\41079 | |
| 701 | 1 | |a Dusaev |b R. R. |c specialist in the field of nuclear physics |c Engineer of Tomsk Polytechnic University |f 1988- |g Renat Ramilyevich |3 (RuTPU)RU\TPU\pers\30972 |9 15210 | |
| 701 | 1 | |a Lyubovitskiy (Lyubovitskij) |b V. E. |c physicist |c Professor of Tomsk Polytechnic University, Doctor of physical and mathematical sciences, Professor of the University of Tubingen (Germany) |f 1963- |g Valery Efimovich |3 (RuTPU)RU\TPU\pers\33385 |9 17080 | |
| 701 | 1 | |a Mamon |b S. A. |c physicist |c laboratory assistant-researcher of Tomsk Polytechnic University |f 1989- |g Sergey Aleksandrovich |3 (RuTPU)RU\TPU\pers\43559 | |
| 701 | 1 | |a Vasilishin |b B. I. |c engineer-physicist |c laboratory researcher at Tomsk Polytechnic University |f 1990- |g Bogdan Ivanovich |3 (RuTPU)RU\TPU\pers\37572 |9 20428 | |
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