Transverse-target-spin asymmetry in exclusive $$\omega $$-meson electroproduction

Airapetian, A.; Акопов, Н.; Akopov, Z.; Aschenauer, E. C.; Augustyniak, W.; Avetissian, A.; Belostotski, S.; Blok, H.P.; Borissov, A.; Bryzgalov, V.; Capitani, G. P.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P.; Deconinck, W.; Лео, Р. Де; Sanctis, E. De; Diefenthaler, M.; Nezza, P. Di; Düren, M.; Elbakian, G.; Ellinghaus, F.; Felawka, L.; Frullani, S.; Gabbert, D.; Gapienko, G.; Гапиенко, В. А.; Gharibyan, V.; Giordano, F.; Gliske, S.; Hoek, M.; Holler, Y.; Ivanilov, A.; Jackson, H. E.; Joosten, S.; Kaiser, R.; Karyan, G.; Keri, T.; Kinney, E.; Kisselev, A.; Коротков, В. А.; Kozlov, V.; Krivokhijine, V. G.; Lagamba, L.; Lapikás, L.; Lehmann, I.; Lenisa, P.; Lorenzon, W.; Q., B.; Manaenkov, S.; Mao, Y.; Mariański, B.; Marukyan, H.; Miyachi, Y.; Movsisyan, A.; Muccifora, V.; Naryshkin, Y.; Nass, A.; Negodaev, M.; Nowak, W.-D.; Pappalardo, L. L.; Pérez-Benito, R.; Petrosyan, A.; Reimer, P. E.; Reolon, A. R.; Riedl, C.; Rith, Klaus; Rosner, G.; Rostomyan, A.; Rubin, J.; Ryckbosch, D.; Salomatin, Y.; Schnell, G.; Seitz, B.; Shibata, T. A.; Statera, M.; Steffens, E.; Steijger, J. J. M.; Stinzing, F.; Taroian, S.; Terkulov, A.; Truty, R.; Trzciński, A.; Tytgat, M.; Haarlem, Y. Van; Hulse, C. Van; Vikhrov, V.; Vilardi, I.; Vogel, Christian; Wang, S.; Yaschenko, S.; Yen, S.; Zihlmann, B.; Żuprański, P.

doi:10.1140/epjc/s10052-015-3825-7

Cited by 10 publications

(6 citation statements)

References 29 publications

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“…This means that generally, the sign of this form factor might be determines experimentally. New HERMES data where 5 modulations of A U T asymmetry was analysed [16] are probably consistent with the positive transition πω form factor. Unfortunately, the large experimental uncertainties prevent a definite conclusion on the sign of this transition form factor.…”

Section: Handbag Approach Pseudoscalar Meson Leptoproductionsupporting

confidence: 53%

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Role of pion pole in hard exlusive meson leptoproduction

Goloskokov

2016

J. Phys.: Conf. Ser.

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We consider the pion pole contribution and transversity effects determined by the HT and ĒT Generalized Parton Distributions (GPDs) which are essential in hard pseudoscalar and vector meson leptoproduction. We investigate spin effects in the ω and ρ 0 reactions. It is shown that the pion pole contribution is very important in the ω production. Such effects in the ρ 0 channel are much smaller. Our results on spin asymmetries and spin density matrix elements in these reactions were found to be in good agreement with HERMES data.

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Section: Handbag Approach Pseudoscalar Meson Leptoproductionsupporting

confidence: 53%

“…The PP effects in ω spin asymmetries are sensitive to the sign of the πω transition form factor [1]. The experimental test of these asymmetries by HERMES [16] does not give a definite conclusion on the sign of the πω transition form factor because of the large experimental uncertainties.…”

Section: Resultsmentioning

confidence: 99%

Role of pion pole in hard exlusive meson leptoproduction

Goloskokov

2016

J. Phys.: Conf. Ser.

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“…Exclusive and diffractive production has been studied in lepton-hadron interactions, both at the FT experiments HERMES [231][232][233][234][235][236][237][238][239][240][241][242][243], COMPASS [244][245][246][247][248][249][250][251], and the experiments at Jefferson Lab [252][253][254][255][256][257][258][259][260][261][262][263][264], and at the collider experiments H1 (see, among others, [265][266][267][268][269][270][271][272][273][274][275][276][277][278][279]…”

Section: Selected Experimental Resultsmentioning

confidence: 99%

Prospects for quarkonium studies at the high-luminosity LHC

Chapon,

d'Enterria,

Ducloue

et al. 2020

Preprint

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We review the prospects for quarkonium-production studies in proton and nuclear collisions accessible during the upcoming phases of the CERN Large Hadron Collider operation after 2021, including the ultimate high-luminosity phase, with increased luminosities compared to LHC Runs 1 and 2. We address the current experimental and theoretical open issues in the field and the perspectives for future studies in quarkoniumrelated physics through the exploitation of the huge data samples to be collected in proton-proton, with integrated luminosities reaching up to L = 3 ab −1 , in proton-nucleus and in nucleus-nucleus collisions, both in the collider and fixed-target modes. Such investigations include, among others, those of: (i) the quarkonia produced in association with other hard particles; (ii) the χ Q and η Q down to small transverse momenta; (iii) the constraints brought in by quarkonia on gluon PDFs, nuclear PDFs, TMDs, GPDs and GTMDs, as well as on the low-x parton dynamics; (iv) the gluon Sivers effect in polarised-nucleon collisions; (v) the properties of the quark-gluon plasma produced in ultra-relativistic heavy-ion collisions and of collective partonic effects in general; and (vi) double and triple parton scatterings.

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“…In particular in transverse spin asymmetries the poorly known transverse GPDs E T , H T ,Ẽ T ,H T can be accessed. Several exclusive pion, ρ and ω measurements became available in the past year [48].…”

Section: Spin Physicsmentioning

confidence: 99%

Spin physics

Seidl¹

2016

Proceedings of XXIV International Workshop on Deep-Inelastic Scattering and Related Subjects — PoS(DIS2016)

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The spin structure of the nucleon is still not very well understood but great progress has been made to understand how much the quark and gluon helicities contribute to the proton spin. In particular recent results from RHIC clearly show a substantial nonzero gluon spin contribution in the accessed x range and the remaining goal is to extend the range down as much as possibleinitially with several remaining RHIC measurements and eventually at an EIC. Updated polarized DIS results improved the precision on the quark helicities while single longitudinal spin asymmetries in the W production of proton-proton collisions indicate an asymmetric, polarized light sea. The transverse spin stucture and exclusive processes opened the way to study the QCD dynamics inside the proton and the hard process, culminating in the prediction of the sign change of the Sivers function when extracted in semi-inclusive DIS and the Drell-Yan(DY) process. While the COMPASS experiment DY measuerments using a pion beam are still being analyzed, first results from the STAR experiment using fully reconstructed W transverse single spin asymmetries indicate a preference for a sign-change scenario. Closely related to these DY-type measurements and other transvserse spin measurements is the theoretical progress and need for experimental input in order to quantitatively describe the evolution of objects explicitly depending on instrinsic transverse momentum. In addition several new deeply virtual compton scattering and hard exlusive meson production measurements increase the amount of information on generalized parton distribution functions and first, more global, DVCS fits become available.

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Transverse-target-spin asymmetry in exclusive $$\omega $$-meson electroproduction

Cited by 10 publications

References 29 publications

Role of pion pole in hard exlusive meson leptoproduction

Role of pion pole in hard exlusive meson leptoproduction

Prospects for quarkonium studies at the high-luminosity LHC

Spin physics

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