Spin density matrix elements in exclusive $$\omega $$ ω electroproduction on $$^1$$ 1 H and $$^2$$ 2 H targets at 27.5 GeV beam energy

Airapetian, A.; Акопов, Н.; Akopov, Z.; Augustyniak, W.; Avetissian, A.; Blok, H.P.; Borissov, A.; Bryzgalov, V.; Capiluppi, M.; Capitani, G. P.; Cisbani, E.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P.; Deconinck, W.; Лео, Р. Де; Sanctis, E. De; Diefenthaler, M.; Nezza, P. Di; Düren, M.; Ehrenfried, M.; Elbakian, G.; Ellinghaus, F.; Etzelmüller, E.; Fabbri, R.; Felawka, L.; Frullani, S.; Gabbert, D.; Gapienko, G.; Гапиенко, В. А.; Garibaldi, F.; Gavrilov, G.; Gharibyan, V.; Hartig, M.; Hasch, D.; Holler, Y.; Hristova, I.; Ivanilov, A.; Jackson, H. E.; Joosten, S.; Kaiser, R.; Karyan, G.; Keri, T.; Kinney, E.; Kisselev, A.; Коротков, В. А.; Kozlov, V.; Kravchenko, P.; Krivokhijine, V. G.; Lagamba, L.; Lapikás, L.; Lehmann, I.; Lenisa, P.; Lorenzon, W.; Ma, Bo-Qiang; Mahon, D.; Manaenkov, S.; Mao, Y.; Mariański, B.; Marukyan, H.; Movsisyan, A.; Murray, M.; Naryshkin, Y.; Nass, A.; Nowak, W.-D.; Pappalardo, L. L.; Pérez-Benito, R.; Petrosyan, A.; Reimer, P. E.; Reolon, A. R.; Riedl, C.; Rith, Klaus; Rostomyan, A.; Ryckbosch, D.; Schäfer, Andreas; Schnell, G.; Schüler, K. P.; Seitz, B.; Shibata, T. A.; Stahl, M.; Stancari, M.; Statera, M.; Steffens, E.; Steijger, J. J. M.; Taroian, S.; Terkulov, A.; Truty, R.; Trzciński, A.; Tytgat, M.; Haarlem, Y. Van; Hulse, C. Van; Vikhrov, V.; Vilardi, I.; Wang, S.; Yaschenko, S.; Yen, S.; Zeiler, D.; Zihlmann, B.; Żuprański, P.

doi:10.1140/epjc/s10052-014-3110-1

Cited by 20 publications

(6 citation statements)

References 35 publications

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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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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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“…Throughout this article, the theoretical formalism of SDMEs and helicity amplitudes introduced by Schilling and Wolf [1] is used, thereby following the notation from Refs. [3,31].…”

Section: Theoretical Formalismmentioning

confidence: 99%

Spin density matrix elements in exclusive $$\rho ^0$$ meson muoproduction

Alexeev,

Alice

et al. 2023

Eur. Phys. J. C

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We report on a measurement of Spin Density Matrix Elements (SDMEs) in hard exclusive $$\rho ^0$$ ρ 0 meson muoproduction at COMPASS using 160 GeV/c polarised $$ \mu ^{+}$$ μ + and $$ \mu ^{-}$$ μ - beams impinging on a liquid hydrogen target. The measurement covers the kinematic range 5.0 GeV/$$c^2$$ c 2 $$< W<$$ < W < 17.0 GeV/$$c^2$$ c 2 , 1.0 (GeV/c)$$^2$$ 2 $$< Q^2<$$ < Q 2 < 10.0 (GeV/c)$$^2$$ 2 and 0.01 (GeV/c)$$^2$$ 2 $$< p_{\textrm{T}}^2<$$ < p T 2 < 0.5 (GeV/c)$$^2$$ 2 . Here, W denotes the mass of the final hadronic system, $$Q^2$$ Q 2 the virtuality of the exchanged photon, and $$p_{\textrm{T}}$$ p T the transverse momentum of the $$\rho ^0$$ ρ 0 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 ($$\gamma ^*_T \rightarrow V^{ }_L$$ γ T ∗ → V L ) indicate a violation of s-channel helicity conservation. Additionally, we observe a dominant contribution of natural-parity-exchange transitions and a very small contribution of unnatural-parity-exchange transitions, which is compatible with zero within experimental uncertainties. The results provide important input for modelling Generalised Parton Distributions (GPDs). In particular, they may allow one to evaluate in a model-dependent way the role of parton helicity-flip GPDs in exclusive $$\rho ^0$$ ρ 0 production.

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“…Using unpolarized nuclear targets, HERMES [89] and COMPASS [90] determined spin density matrix elements (SDMEs), which describe how the spin components of the virtual photon are transferred to the created vector meson. The SDMEs parameterize the function W(W, Q 2 , t, Φ, φ, cos Θ) appearing in the cross section for vector-meson production.…”

Section: Hard Exclusive Meson Productionmentioning

confidence: 99%

“…Top left: decay of vector meson. Top right: ratio R (longitudinal to transverse vector mesons) at HERMES [89], in comparison to calculations with (red solid) and without (green dashed) pion pole (Goloskokov-Kroll model [91]). Bottom: COMPASS SDMEs [90] describing the spin transfer from the virtual photon γ * to the vector meson (here: ω), both of which can be either longitudinally (L) or transversely (T) polarized.…”

Section: Gpd Universality and Advanced Extractionsmentioning

confidence: 99%

Probing nucleon spin structure in deep-inelastic scattering, proton-proton collisions and Drell-Yan processes

Riedl

2022

Preprint

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A pedagogical summary of current and past experimental results of spin-dependent nucleon structure prior to the arrival of the Electron-Ion Collider is attempted. After an introduction, results from fixed-target experiments at SLAC, Fermilab, Jefferson Lab, CERN and DESY and collider experiments from RHIC are presented, starting with the longitudinal spin structure of the nucleon, followed by generalized parton distributions (GPDs), which map the proton in transverse position space. The final part discusses transverse proton or parton spin and transverse parton momenta (TMDs), and their their (spin-orbit) correlations, which are addressed by a multitude of recent experimental results. The GPDs and TMDs provide complementary pathways to mapping multi-dimensional nucleon structure.

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Spin density matrix elements in exclusive $$\omega $$ ω electroproduction on $$^1$$ 1 H and $$^2$$ 2 H targets at 27.5 GeV beam energy

Cited by 20 publications

References 35 publications

Prospects for quarkonium studies at the high-luminosity LHC

Prospects for quarkonium studies at the high-luminosity LHC

Spin density matrix elements in exclusive $$\rho ^0$$ meson muoproduction

Probing nucleon spin structure in deep-inelastic scattering, proton-proton collisions and Drell-Yan processes

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