Observation of a Coherence Length Effect in Exclusive<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi mathvariant="italic">ρ</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>Electroproduction

Ackerstaff, K.; Airapetian, A.; Акопов, Н.; Akushevich, Igor; Amarian, M.; Aschenauer, E. C.; Avakian, H.; Avakian, R.; Avetissian, A.; Bains, B.; Barrow, S.; Baumgarten, C.; Beckmann, M.; Belostotski, S.; Belz, Andrea; Benisch, T.; Bernreuther, S.; Bianchi, N.; Blanchard, S.; Blouw, J.; Böttcher, H.; Borissov, A.; Brack, J.; Brauksiepe, S.; Braun, B.; Bray, B.; Brons, S.; Brückner, W.; Brüll, A.; Bruins, E. E. W.; Bulten, H.; Cadman, R. V.; Capitani, G. P.; Carter, P.; Chumney, P.; Cisbani, E.; Court, G.R.; Dalpiaz, P.; Delheij, P. P. J.; Sanctis, E. De; Schepper, D. De; Devitsin, E.; Huberts, P.K.A. de Witt; Nezza, P. Di; Düren, M.; Dvoredsky, A.; Elbakian, G.; Ely, James H.; Emerson, Joseph; Fantoni, A.; Fechtchenko, A.; Ferstl, M.; Fick, D.; Fiedler, K.; Filippone, B. W.; Fischer, H.; Fortune, H. T.; Fox, B. D.; Frabetti, S.; Franz, J.; Frullani, S.; Funk, M.-A.; Gagunashvili, N.; Galumian, P.; Gao, H.; Gärber, Y.; Garibaldi, F.; Gavrilov, G.; Geiger, P.; Gharibyan, V.; Giordjian, V.; Golendukhin, A.; Graw, G.; Grebeniouk, O.; Green, P. W.; Greeniaus, L.G.; Großhauser, C.; Guidal, M.; Gute, A.; Gyurjyan, V.; Haas, J.; Haeberli, W.; Hansen, J.O.; Hasch, D.; Häusser, O.; Heinsius, F. H.; Henderson, R.; Henkes, T.; Henoch, M.; Hertenberger, R.; Holler, Y.; Holt, R. J.; Hoprich, W.; Ihssen, H.; Iodice, M.; Izotov, A.; Jackson, H. E.; Jgoun, A.; Jones, C. E.; Kaiser, R.; Kinney, E.; Kirsch, Matthias; Kisselev, A.; Kitching, P.; Kobayashi, Hisao; Koch, Norbert; Königsmann, K.; Kolstein, M.; Kolster, H.; Коротков, В. А.; Korsch, W.; Kozlov, V.; Kramer, L. H.; Krause, B.; Krivokhijine, V. G.; Kückes, M.; Kümmell, F.; Kyle, G. S.; Lachnit, W.; Lorenzon, W.; Lung, A.; Makins, N.; Martens, F. K.; Martin, J. W.; Masoli, F.; Mateos, A.; McAndrew, M.; McIlhany, K.; McKeown, R. D.; Meißner, F.; Menden, F.; Mercer, D.; Metz, A.; Meyners, N.; Mikloukho, O.; Miller, C. A.; Miller, M. A.; Milner, R.; Mitsyn, Valeri Valentinovitch; Most, A.; Mozzetti, R.; Muccifora, V.; Нагайцев, А.; Naryshkin, Y.; Nathan, Alan M.; Neunreither, F.; Niczyporuk, M.; Nowak, W.-D.; Nupieri, M.; Oelwein, P.; Ogami, H.; O’Neill, T. G.; Openshaw, R.; Ouyang, J.; Owen, B.; Papavassiliou, V.; Pate, S. F.; Pitt, M. L.; Poolman, H. R.; Potashov, S.; Potterveld, D. H.; Povh, Bogdan; Rakness, G.; Reali, A.; Redwine, R.; Reolon, A. R.; Ristinen, R.A.; Rith, Klaus; Roloff, H.; Röper, G.; Rossi, P.; Rudnitsky, S.; Ruh, M.; Ryckbosch, D.; Sakemi, Y.; Savin, I.; Scarlett, C.; Schmidt, Friedrich; Schmitt, H. von der; Schnell, G.; Schüler, K. P.; Schwind, A.; Seibert, J. Anthony; Shibata, T. A.; Shin, Taeho; Shutov, V.; Simani, C.; Simon, A.; Sinram, K.; Slavich, Pietro; Sowiński, J.; Spengos, M.; Steffens, E.; Stenger, J.; Stewart, J.; Stock, F.; Stoesslein, U.; Sutter, M.; Tallini, H.; Taroian, S.; Terkulov, A.; Thiessen, D.; Thomas, E.; Tipton, B.; Trudel, A.; Tytgat, M.; Urciuoli, G. M.; Hunen, J. J. van; Vyver, R. Van de; Brand, J. van den; Steenhoven, G. van der; Vetterli, M. C.; Vikhrov, V.; Vincter, M. G.; Visser, J.; Volk, E.; Wander, W.; Welch, T. P.; Williamson, S. E.; Wise, T.; Wölfel, T.; Woller, K.; Yoneyama, Satoshi; Zapfe-Düren, K.; Zohrabian, H.; Zurmühle, R. W.

doi:10.1103/physrevlett.82.3025

Cited by 71 publications

(51 citation statements)

References 27 publications

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“…This result might be treated as success of VDM. On the other hand, A calculation [47] using VDM and σ πp tot ≈ 25 mb instead of σ ρp tot at lower energy for photoproduction of ρ-mesons off nuclei is in good agreement with recent HERMES measurements [48].…”

Section: Absorption Cross Section For Virtual Photonssupporting

confidence: 86%

“…The key ingredient of (45), (48) and (49) is the distribution function Ψ Gq (α, r) of the quark-gluon fluctuation, where α is the fraction of the light-cone momentum of the parent quark carried by the gluon, and r is the transverse quark-gluon separation. This function has a form [36,52,53] similar to (1),…”

Section: Gluon Bremsstrahlung 31 Radiation Of Interacting Gluonsmentioning

confidence: 99%

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Nonperturbative effects in gluon radiation and photoproduction of quark pairs

2000

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We introduce a nonperturbative interaction for light-cone fluctuations containing quarks and gluons. Theqq interaction squeezes the transverse size of these fluctuations in the photon and one does not need to simulate this effect via effective quark masses. The strength of this interaction is fixed by data. Data on diffractive dissociation of hadrons and photons show that the nonperturbative interaction of gluons is much stronger. We fix the parameters for the nonperturbative quark-gluon interaction by data for diffractive dissociation to large masses (triple-Pomeron coupling). This allows us to predict nuclear shadowing for gluons which turns out to be not as strong as perturbative QCD predicts. We expect a delayed onset of shadowing at x ≤ 10 −2 due to the fact that photon fluctuations (containing a gluon) are heavier than in the case of quark shadowing. We use the same concept to improve our description of gluon bremsstrahlung which is related to the distribution function for a quark-gluon fluctuation and the interaction cross section of aqqG fluctuation with a nucleon. We expect the nonperturbative interaction to suppress dramatically the gluon radiation at small transverse momenta. Also the Landau-Pomeranchuk suppression for gluon radiation of a quark propagating through a nucleus turns out to be smaller than predicted by perturbative QCD.

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Section: Absorption Cross Section For Virtual Photonssupporting

confidence: 86%

Section: Gluon Bremsstrahlung 31 Radiation Of Interacting Gluonsmentioning

confidence: 99%

Nonperturbative effects in gluon radiation and photoproduction of quark pairs

2000

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“…The discovery [1,2] by the European Muon Collaboration (EMC) that the axial charge of the proton is much smaller than expected from the Ellis-Jaffe sum rule [3] implies that the nucleon spin is not simply made up by the quark spins. This surprising result was confirmed by a series of experiments: the Spin Muon Collaboration experiment at CERN [4,5,6], the SLAC experiments E142 [7], E143 [8], E154 [9,10], E155 [11,12] and the Hermes experiment [13,14,15] at DESY. They increased the kinematic range and the precision of the data to a level where QCD analyses begin to become a powerful tool like in the unpolarised case.…”

Section: Introductionmentioning

confidence: 84%

“…a u-quark (d-quark) into π + (π − ) one can perform a flavour separation in the parton distribution functions. The asymmetries from the SMC and Hermes experiments [6,15] for positive and negative hadrons are shown in Fig. 14. A full particle identification was not available in these experiments.…”

Section: Semi-inclusive Datamentioning

confidence: 99%

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The Spin Structure of the Nucleon

Mallot

2000

Lepton and Photon Interactions at High Energies

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Heavy Flavor Production off Protons and in a Nuclear Environment

Kopeliovich¹,

Raufeisen²

2004

Heavy Quark Physics

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These lectures present an overview of the current status of the QCD based phenomenology for open and hidden heavy flavor production at high energies. A unified description based on the light-cone color-dipole approach is employed in all cases. A good agreement with available data is achieved without fitting to the data to be explained, and nontrivial predictions for future experiments are made. The key phenomena under discussion are: (i) formation of the wave function of a heavy quarkonium; (ii) quantum interference and coherence length effects; (iii) Landau-Pomeranchuk suppression of gluon radiation leading to gluon shadowing and nuclear suppression of heavy flavors; (iv) higher twist shadowing related to the finite size of heavy quark dipoles; (v) higher twist corrections to the leading twist gluon shadowing making it process dependent.

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Observation of a Coherence Length Effect in Exclusiveρ0Electroproduction

Cited by 71 publications

References 27 publications

Nonperturbative effects in gluon radiation and photoproduction of quark pairs

Nonperturbative effects in gluon radiation and photoproduction of quark pairs

The Spin Structure of the Nucleon

Heavy Flavor Production off Protons and in a Nuclear Environment

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