Broadening of transverse momentum of partons propagating through a medium

Johnson, Mikkel B.; Kopeliovich, B. Z.; Tarasov, A.V.

doi:10.1103/physrevc.63.035203

Cited by 82 publications

(143 citation statements)

References 46 publications

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“…An increase of δ p 2 T with energy is expected in the dipole approach [13,14] T from the color filtering mechanism of Ref. [9].…”

mentioning

confidence: 85%

Heavy quark production and gluon shadowing at RHIC and LHC

Raufeisen¹

2004

J. Phys. G: Nucl. Part. Phys.

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Abstract. I review the color dipole formulation of heavy quark production in the light of recent RHIC data. Since charm and bottom production directly probe the gluon density, these processes allow one to study shadowing and parton saturation at RHIC and LHC. The dipole approach provides a convenient framework to calculate these nuclear effects. I present numerical results for open charm and bottom production in proton-proton and proton-nucleus collisions and discuss transverse momentum broadening of heavy quarkonia.At high center of mass energies √ s, the cross section for any reaction a + N → {b, c, . . .}X can be expressed as convolution of the light-cone (LC) wavefunction for the transition a → {b, c, . . .} and the cross section for scattering the color neutral {anti−a, b, c . . .}-system on the target nucleon N . In the case of heavy quark production this means that the Feynman graphs in Fig. 1 can be written in the form [1, 2],where σ qqG is the cross section for scattering a color neutral quark-antiquark-gluon system on a nucleon [2],Here α is the light-cone momentum fraction carried by the heavy quark Q, and α = 1 − α is the momentum fraction of theQ. The flavor independent dipole cross section σ qq (ρ) is a nonperturbative quantity and has to be determined from experimental data. It depends on the transverse separation ρ between quark and antiquark. Note that the dipole approach is formulated in the target rest frame with ¡ É É ¡¡ Figure 1. The three lowest order graphs contributing to heavy quark production in the dipole approach. These graphs correspond to the gluon-gluon fusion mechanism of heavy quark production in the parton model.

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“…An increase of δ p 2 T with energy is expected in the dipole approach [13,14] T from the color filtering mechanism of Ref. [9].…”

mentioning

confidence: 85%

Heavy quark production and gluon shadowing at RHIC and LHC

Raufeisen¹

2004

J. Phys. G: Nucl. Part. Phys.

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“…(22) and (23) respectively, with the same boosted potential (24). This is important for self-consistency of the method and for the correct behavior of Eq.…”

Section: A Attenuation Of J/ψmentioning

confidence: 99%

“…Calculated within the framework of the dipole approach [21], the broadening rate was found to be [22],…”

Section: Absorption In Cold and Hot Mediamentioning

confidence: 99%

Survival of charmonia in a hot environment

et al. 2015

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A colorlesscc dipole emerging from a heavy ion collision and developing the charmonium wave function can be broken-up by final state interactions (FSI) propagating through the hot medium created in the collision. We single out two mechanisms of charmonium attenuation: (i) Debye color screening, called melting; and (ii) color-exchange interaction with the medium, called absorption. The former problem has been treated so far only for charmonia at rest embedded in the medium, while in practice their transverse momenta at the LHC are quite high, p 2 T = 7 − 10 GeV 2 . We demonstrate that acc dipole may have a large survival probability even at infinitely high temperature. We develop a procedure of Lorentz boosting of the Schrödinger equation to a moving reference frame and perform the first realistic calculations of the charmonium survival probability employing the path-integral technique, incorporating both melting and absorption. These effects are found to have comparable magnitudes. We also calculated the FSI suppression factor for the radial excitation ψ(2S) and found it to be stronger than for J/ψ, except large pT , where ψ(2S) is relatively enhanced. The azimuthal asymmetry parameter v2 is also calculated.

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“…Calculated within the framework of the dipole approach [9], the broadening rate was found to be [11],…”

Section: Absorptionmentioning

confidence: 99%

Charmonium propagation through a dense medium

Kopeliovich

Potashnikova

Schmidt

et al. 2015

EPJ Web of Conferences

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Abstract. Attenuation of a colourlesscc dipole propagating with a large momentum through a hot medium originates from two sources, Debye screening (melting), and inelastic collisions with surrounding scattering centres (absorption). The former never terminates completely production of a bound charmonium in heavy ion collisions, even at very high temperatures. The latter, is controlled my the magnitude of the dipole cross section, related to the transport coefficient, which is the rate of transverse momentum broadening in the medium. A novel procedure of Lorentz boosting of the Schrödinger equation is developed, which allows to calculate the charmonium survival probability employing the path-integral technique, incorporating both melting and absorption. A novel mechanism of charmonium regeneration in a dense medium is proposed.

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Broadening of transverse momentum of partons propagating through a medium

Cited by 82 publications

References 46 publications

Heavy quark production and gluon shadowing at RHIC and LHC

Heavy quark production and gluon shadowing at RHIC and LHC

Survival of charmonia in a hot environment

Charmonium propagation through a dense medium

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