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Nemchik, J.

doi:10.1023/a:1023492310246

Cited by 5 publications

(14 citation statements)

References 22 publications

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“…The corresponding theoretical tool has been developed for the first time only recently in [28], and applied to electroproduction of light vector mesons at medium and high energies. The same approach was used later for the study of virtual photoproduction of heavy vector mesons [29,30]. Even within the VDM the Glauber model expression interpolating between the limiting cases of low [(i), (ii)] and high [(iii)] energies has been also derived only recently [41].…”

Section: Different Regimes For Incoherent Production Of Vector Mesonsmentioning

confidence: 99%

“…On the other hand, as was discussed in Refs. [28,29,30], the coherence and formation effects in electroproduction of vector mesons off nuclei are much more visible for light than for heavy vector mesons. The same happens for the study of differences in electroproduction of L and T polarized vector mesons.…”

Section: E Realistic Predictions For the Nuclear Ratio R A Lt (Inc)mentioning

confidence: 99%

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Production of polarized vector mesons off nuclei

2007

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Using the light-cone QCD dipole formalism we investigate manifestations of color transparency (CT) and coherence length (CL) effects in electroproduction of longitudinally (L) and transversally (T) polarized vector mesons. Motivated by forthcoming data from the HERMES experiment we predict both the A and Q 2 dependence of the L/T -ratios, for ρ 0 mesons produced coherently and incoherently off nuclei. For an incoherent reaction the CT and CL effects add up and result in a monotonic A dependence of the L/T -ratio at different values of Q 2 . On the contrary, for a coherent process the contraction of the CL with Q 2 causes an effect opposite to that of CT and we expect quite a nontrivial A dependence, especially at Q 2 ≫ m 2 V .

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Section: Different Regimes For Incoherent Production Of Vector Mesonsmentioning

confidence: 99%

Section: E Realistic Predictions For the Nuclear Ratio R A Lt (Inc)mentioning

confidence: 99%

Production of polarized vector mesons off nuclei

2007

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“…2, left). There is a first attempt of theoretical models, EPOS [11] and calculations by Nemchick et al [12,13] to describe the complete π 0 spectrum in Pb-Pb collisions (see Fig. 2, right).…”

Section: Ali-der-74254mentioning

confidence: 99%

Neutral meson production in pp and Pb–Pb collisions measured by ALICE at the LHC

Marı́n

2014

Nuclear Physics A

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The midrapidity π 0 nuclear modification factor, R AA , at √ s NN = 2.76 TeV in 6 centrality classes as well as the corresponding π 0 invariant yields in Pb-Pb and in pp collisions are presented. The transverse momentum range covered is 0.6 (0.4) GeV/c < p T < 12 (10) GeV/c for Pb-Pb (pp) collisions. A suppression of neutral pions increasing with centrality is observed. The yield of charged particles associated with a high p T neutral pion trigger (8 GeV/c < p T < 16 GeV/c) is measured in pp and Pb-Pb collisions at √ s NN = 2.76 TeV. The conditional per-trigger yield modification factor in the near and away side is in agreement with the measured one for charged particles.Keywords: Hadron production, heavy-ion collisions, LHCSince the startup of the CERN LHC data from pp collisions at √ s = 0.9, 2.76, 7 and 8 TeV and Pb-Pb collisions at √ s NN = 2.76 TeV are available. An energy density of ∼ 15 GeV/fm 3 at a collision time of 1 fm/c [1] (about 3 times larger than at RHIC) is reached in Pb-Pb collisions that is above the critical energy density of 1 GeV/fm 3 to undergo the predicted QCD phase transition to the Quark-Gluon Plasma (QGP, deconfined state of matter). The energy loss of hard partons produced, in the early stage of the collisions, via radiative or collisional mechanisms when traversing the QGP translates into modifications of the high p T hadron yields in Pb-Pb collisions when compared to pp collisions. This effect first observed at RHIC for charged particles and neutral pions [2] has been also reported at the CERN LHC [3]. In order to quantify the suppression the nuclear modification factor is computed from the measurement in Pb-Pb and pp collisions using:

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“…An alternative description of CT in electroproduction of vector mesons can be realized also within the quark-gluon representation [26,21,22,27,28,29,30]. Here a photon of high virtuality Q 2 is expected to produce a pair with a small ∼ 1/Q 2 transverse separation 2 .…”

Section: Introductionmentioning

confidence: 99%

“…The same LC Green function formalism has been already applied also for Drell-Yan production in proton-nucleus and nucleusnucleus interactions [31], for nuclear shadowing in DIS [32,33], and for coherent and incoherent electroproduction of vector mesons off nuclei [28,29,30].…”

Section: Introductionmentioning

confidence: 99%

Color transparency in electroproduction of the ρ meson at low energies

2007

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The study of color transparency (CT) in elastic electroproduction of vector mesons off nuclei encounters the problem of the onset of coherence length (CL) effects. The problem of CT-CL separation arises especially at medium energies, corresponding to HERMES experiment, when the coherence length is of the order of the nuclear radius R A . Only at asymptotic large energies, corresponding to large CL, l c ≫ R A , the CT-CL mixing can be eliminated. On the other hand, the net CT effects can be studied in the kinematic range accessible by the CLAS experiment, since in this case the CL is much smaller than the nuclear radius. Using light-cone quantum chromodynamics (QCD) dipole formalism we investigate manifestations of CT effects in electroproduction of vector mesons. Motivated by expected data from the CLAS experiment at JLab, we predict the A and Q 2 dependence of nuclear transparency for ρ 0 mesons produced incoherently off nuclei. We demonstrate that in the CLAS kinematic region the CL effects are weak enough to keep the photon energy at such values as to obtain maximal photon virtualities keeping optimal statistics of the data. This has a clear advantage in comparison with a standard investigation of net CT effects fixing CL.

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Cited by 5 publications

References 22 publications

Production of polarized vector mesons off nuclei

Production of polarized vector mesons off nuclei

Neutral meson production in pp and Pb–Pb collisions measured by ALICE at the LHC

Color transparency in electroproduction of the ρ meson at low energies

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