Ratios of helicity amplitudes for exclusive ρ0 electroproduction

Airapetian, A.; Акопов, Н.; Akopov, Z.; Aschenauer, E. C.; Augustyniak, W.; Avakian, R.; Avetissian, A.; Avetisyan, E.; Belostotski, S.; Bianchi, N.; Blok, H.P.; Borissov, A.; Bowles, J.; Bryzgalov, V.; Burns, J.; Capiluppi, M.; Capitani, G. P.; Cisbani, E.; Ciullo, G.; Contalbrigo, M.; Dalpiaz, P. F.; Deconinck, W.; Лео, Р. Де; Nardo, L. De; Sanctis, E. De; Diefenthaler, M.; Nezza, P. Di; Düren, M.; Ehrenfried, M.; Elbakian, G.; Ellinghaus, F.; Fabbri, R.; Fantoni, A.; Felawka, L.; Frullani, S.; Gabbert, D.; Gapienko, G.; Гапиенко, В. А.; Garibaldi, F.; Gavrilov, G.; Gharibyan, V.; Giordano, F.; Gliske, S.; Golembiovskaya, M.; Hadjidakis, C.; Hartig, M.; Hasch, D.; Hill, G.; Hillenbrand, A.; Hoek, M.; Holler, Y.; Hristova, I.; Imazu, Y.; Ivanilov, A.; Jackson, H. E.; Jo, H. S.; Joosten, S.; Kaiser, R.; Karyan, G.; Keri, T.; Kinney, E.; Kisselev, A.; Kobayashi, N.; Коротков, В. А.; Kozlov, V.; Kravchenko, P.; Krivokhijine, V. G.; Lagamba, L.; Lamb, R.; Lapikás, L.; Lehmann, I.; Lenisa, P.; Linden-Levy, L. A.; Ruiz, A.; Lorenzon, W.; Lu, X.-G.; Lu, X. R.; Q., B.; Mahon, D.; Makins, N.; Manaenkov, S.; Manfré, L.; Mao, Y.; Mariański, B.; Ossa, A. Martínez de la; Marukyan, H.; Miller, C. A.; Miyachi, Y.; Movsisyan, A.; Muccifora, V.; Murray, M.; Mussgiller, A.; Nappi, E.; Naryshkin, Y.; Nass, A.; Negodaev, M.; Nowak, W.-D.; Pappalardo, L. L.; Pérez-Benito, R.; Pickert, N.; Reimer, P. E.; Reolon, A. R.; Riedl, C.; Rith, Klaus; Rosner, G.; Rostomyan, A.; Rubin, J.; Ryckbosch, D.; Salomatin, Y.; Sanftl, F.; Schäfer, Andreas; Schnell, G.; Schüler, K. P.; Seitz, B.; Shibata, T. A.; Shutov, V.; Stancari, M.; Statera, M.; Steffens, E.; Steijger, J. J. M.; Stinzing, F.; Taroian, S.; Terkulov, A.; Trzciński, A.; Tytgat, M.; Vandenbroucke, A.; Haarlem, Y. Van; Hulse, C. Van; Veretennikov, D.; Vikhrov, V.; Vilardi, I.; Wang, S.; Yaschenko, S.; Yen, S.; Yu, W.; Zihlmann, B.; Żuprański, P.

doi:10.1140/epjc/s10052-011-1609-2

Cited by 18 publications

(3 citation statements)

References 53 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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“…The ratios of helicity amplitudes published recently by HERMES [12] provide a convenient insight into the physics of electroproduction of vector meson. For those ratios exist also theoretical predictions [13,10] The real and imaginary parts of ratios of NPE helicity amplitudes:…”

Section: Ratios Of Helicity Amplitudementioning

confidence: 99%

Hard exclusive electroproduction of vector mesons at HERMES

Augustyniak¹

2012

AIP Conference Proceedings

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Exclusive production of vector mesons was studied with the HERMES spectrometer at the DESY laboratory by scattering 27.6 GeV longitudinally polarized electrons or positrons off unpolarized hydrogen and deuterium as well as off transversely polarized hydrogen internal targets. Results of the measurements of the Spin Density Matrix Elements (SDMEs) for ρ 0 and φ , the ratios of helicity amplitudes for ρ 0 on unpolarized H and D targets as well as of the transverse target spin asymmetry (A U T ) for ω and φ production on a transversely polarized H target will be reported.

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“…It is also possible to interpret measurements of produced mesons in the GPD framework, e.g. [6,7,8,9]. The Hermes experiment recently produced DVCS measurements from the entire 1995-2007 data set, where beam helicity and charge azimuthal asymmetries in the produced particle distributions are measured, see figures 1 and 2 respectively.…”

Section: Exclusive Physicsmentioning

confidence: 99%

DVCS @ Hermes

Murray

2011

AIP Conference Proceedings

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The study of Generalised Parton Distributions (GPDs) promises to provide new knowledge of the structure of the nucleon, including, most notably, access to the total angular momentum of quarks within the nucleon. It can be difficult to ascertain new information on the distributions, but amongst all the exclusive processes that can provide access, Deeply Virtual Compton Scattering (DVCS) is relatively simple and experimentally accessible. The HERMES collaboration has the most diverse results pertaining to DVCS of any experiment, extracting asymmetries in the azimuthal distribution of produced photons according to both beam helicity and charge and target spin state. In this talk, we provide an overview of the HERMES DVCS result catalogue and explain how the results are used to improve constraints on the underlying GPDs.

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Ratios of helicity amplitudes for exclusive ρ0 electroproduction

Cited by 18 publications

References 53 publications

Prospects for quarkonium studies at the high-luminosity LHC

Prospects for quarkonium studies at the high-luminosity LHC

Hard exclusive electroproduction of vector mesons at HERMES

DVCS @ Hermes

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