Nuclear-Target Effects in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mfrac><mml:mrow><mml:mi>J</mml:mi></mml:mrow><mml:mrow><mml:mi>ψ</mml:mi></mml:mrow></mml:mfrac></mml:math>Production in 125-GeV/<i>c</i>Antiproton and<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>π</mml:mi></mml:mrow><mml:mrow><mml:mo>−</mml:mo></mml:mrow></mml:msup></mml:mrow></mml:math>Interactions

Katsanevas, S.; Kourkoumelis, C.; Μάρκου, Α.; Resvanis, L. K.; Tzamarias, S.; Voulgaris, G.; Binkley, M.; Cox, B.; Enagonio, J.; Hojvat, C.; Judd, D.; Kephart, R.; Malhotra, P.K.; Mazur, Péter; Murphy, C.T.; Turkot, F.; Wagner, R. L.; Wagoner, D. E.; Yang, W. C.; Areti, H.; Conetti, S.; Lebrun, P.; Ryan, D.; Ryan, Timothy A.; Schappert, W.; Stairs, D. G.; Akerlof, C.; Kraushaar, P.; Nitz, D.; Thun, R.; He, M.; Zhang, Naijian

doi:10.1103/physrevlett.60.2121

Cited by 104 publications

(14 citation statements)

References 33 publications

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“…By now, the A dependence of J/ψ production at x F > 0 is known to rather high precision at several different energies [3,4,5,6,7,8]. While the ψ ′ A dependence is not as accurately known, its statistics were sufficient for the E866 collaboration to determine that the ψ ′ α is smaller than the J/ψ α for x F < 0.2 [8].…”

Section: Introductionmentioning

confidence: 99%

Are the J/ψ and χc A dependencies the same?

Vogt

2002

Nuclear Physics A

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It has been empirically observed that the dependence of J/ψ and ψ ′ production on nuclear mass number A is very similar. This has been postulated to be due to the predominance of color octet pre-resonant states in charmonium production and absorption. Two new experiments, NA60 at CERN and HERA-B at DESY, will measure the χ c A dependence for the first time. These measurements should shed new light on the charmonium production and absorption mechanisms.

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Section: Introductionmentioning

confidence: 99%

Are the J/ψ and χc A dependencies the same?

Vogt

2002

Nuclear Physics A

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“…Understanding this effect has been a challenge for a long time. Although the first data [24] were well-explained and even predicted [60] by an energyloss mechanism [53], later data on J/Ψ production at higher energies demonstrated that this mechanism is not sufficient, since it does not explain the observed x F scaling.…”

Section: Charmonium Suppression At Large Xfmentioning

confidence: 99%

Breakdown of QCD factorization at large Feynmanx

et al. 2005

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Recent measurements by the BRAHMS collaboration of high-pT hadron production at forward rapidities at RHIC found the relative production rate (d − Au)/(p − p) to be suppressed, rather than enhanced. Examining other known reactions (forward production of light hadrons, the DrellYan process, heavy flavor production, etc.), one notes that all of these display a similar property, namely, their cross sections in nuclei are suppressed at large xF . Since this is the region where x2 is minimal, it is tempting to interpret this as a manifestation of coherence, or of a color glass condensate, whereas it is actually a simple consequence of energy conservation and takes place even at low energies. We demonstrate that in all these reactions there is a common suppression mechanism that can be viewed, alternatively, as a consequence of a reduced survival probability for large rapidity gap processes in nuclei, Sudakov suppression, an enhanced resolution of higher Fock states by nuclei, or an effective energy loss that rises linearly with energy. Our calculations agree with data.

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“…[26]). It was demonstrated many years [3,27] ago that the x F -dependence of J/ψ suppression at energies 150 − 300 GeV could be well described by energy loss, with −dE/dz ≈ 3-4 GeV/fm. The larger value for a projectile gluon is consistent with an enhancement due to the Casimir factor, 9/4.…”

mentioning

confidence: 99%

Energy Loss of Fast Quarks in Nuclei

Johnson¹,

Kopeliovich²,

Potashnikova³

et al. 2001

Phys. Rev. Lett.

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We report an analysis of the nuclear dependence of the yield of Drell-Yan dimuons from the 800 GeV/c proton bombardment of 2 H, C, Ca, Fe, and W targets. Employing a new formulation of the Drell-Yan process in the rest frame of the nucleus, this analysis examines the effect of initial-state energy loss and shadowing on the nuclear-dependence ratios versus the incident proton's momentum fraction and dimuon effective mass. The resulting energy loss per unit path length is −dE/dz = 2.32 ± 0.52 ± 0.5 GeV/fm. This is the first observation of a nonzero energy loss of partons traveling in nuclear environment.24.85.+p; 13.85.Qk; 25.40.Ve For many years it has been suggested that quark energy loss might give rise to a nuclear dependence [1][2][3][4] of the cross section of Drell-Yan [5] (DY) production. When a proton enters a nucleus the first (soft) inelastic collision liberates a quark, which then loses energy via hadronization (due to confinement) and interaction in the nuclear medium. A lepton pair created from a subsequent interaction then has reduced energy compared with the DY process on a free nucleon. The goal of the present analysis is to search for this effect in the nuclear dependence of the DY process.Fermilab E772 made a precise measurement of the nuclear dependence of the DY process using 800 GeV/c protons. The experimental details of E772 have been described previously [6][7][8]. Briefly we indicate those germane to the present discussion. Muon pairs were recorded from targets of 2 H, C, Ca, Fe, and W, in the mass range M ≥ 4 GeV/c 2 . Excluding the Υ resonance region, 9 ≤ M ≤ 11 GeV/c 2 , we reconstruct 2.5 × 10 5

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Nuclear-Target Effects inJψProduction in 125-GeV/cAntiproton andπ−Interactions

Cited by 104 publications

References 33 publications

Are the J/ψ and χc A dependencies the same?

Are the J/ψ and χc A dependencies the same?

Breakdown of QCD factorization at large Feynmanx

Energy Loss of Fast Quarks in Nuclei

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