Initial/final state interaction in di-jet production off nuclei

Kopeliovich, B. Z.

doi:10.1016/0370-2693(94)01431-b

Cited by 4 publications

(4 citation statements)

References 14 publications

(25 reference statements)

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“…In the production of two high-p T back-to-back hadrons (or jets) off nuclei, one of the hadrons defines the scattering plane, while the acoplanarity of the other one serves as a measure for the nuclear broadening of the transverse momenta by initial and final state interactions. Available data [6,7] demonstrate an unusually strong effect (see the interpretation in [8]).…”

Section: Introductionmentioning

confidence: 94%

Broadening of transverse momentum of partons propagating through a medium

2001

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Broadening of the transverse momentum of a parton propagating through a medium is treated using the color dipole formalism, which has the advantage of being a well developed phenomenology in deep-inelastic scattering and soft processes. Within this approach, nuclear broadening should be treated as color filtering, i.e. absorption of large-size dipoles leading to diminishing (enlarged) transverse separation (momentum). We also present a more intuitive derivation based on the classic scattering theory of Molière. This derivation helps to understand the origin of the dipole cross section, part of which comes from attenuation of the quark, while another part is due to multiple interactions of the quark. It also demonstrates that the lowest-order rescattering term provides an A-dependence very different from the generally accepted A 1/3 behavior. The effect of broadening increases with energy, and we evaluate it using different phenomenological models for the unintegrated gluon density. Although the process is dominated by soft interactions, the phenomenology we use is tested using hadronic cross section data.

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Section: Introductionmentioning

confidence: 94%

Broadening of transverse momentum of partons propagating through a medium

2001

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“…Partonic rescatterings in medium cause an imbalance in p T perpendicular to the initial hard scattering plane [19,20] leading to p T broadening that is reflected in the width of the back-to-back peak [21]. In contrast, the close-angle peak is not affected since both pions originate from fragmentation of the same parton, and propagating as color singlets experience only little rescattering thereafter.…”

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confidence: 99%

Semihard Scattering Unraveled from Collective Dynamics by Two-Pion Azimuthal Correlations in158A GeV/c
Agakichiev¹,
Appelshäuser²,
Baur³
et al. 2004
Phys. Rev. Lett.

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Elliptic flow and two-particle azimuthal correlations of charged hadrons and high-p(T) pions (p(T)>1 GeV/c) have been measured close to midrapidity in 158A GeV/c Pb+Au collisions by the CERES experiment. Elliptic flow (v(2)) rises linearly with p(T) to a value of about 10% at 2 GeV/c. Beyond p(T) approximately 1.5 GeV/c, the slope decreases considerably, possibly indicating a saturation of v(2) at high p(T). Two-pion azimuthal anisotropies for p(T)>1.2 GeV/c exceed the elliptic flow values by about 60% in midcentral collisions. These nonflow contributions are attributed to nearside and back-to-back jetlike correlations, the latter exhibiting centrality dependent broadening.

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“…It is interesting to note that, while E772 only used dileptons with p T ∼ < 3 GeV, the transverse momentum imbalance in photoproduction of dijets was measured by E683 [30] only for jets with p T > 3 GeV. It has been argued in [31], that the unusually large effect observed by E683 is (in part) caused by this restriction on p T . In fact, a value of λ 2 LQS ≈ 0.1 GeV 2 is needed to accommodate the E683 result [5].…”

Section: Phenomenological Applicationsmentioning

confidence: 99%

Relating different approaches to nuclear broadening

Raufeisen

2003

Physics Letters B

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Transverse momentum broadening of fast partons propagating through a large nucleus is proportional to the average color field strength in the nucleus. In this work, the corresponding coefficient is determined in three different frameworks, namely in the color dipole approach, in the approach of Baier et al. and in the higher twist factorization formalism. This result enables one to use a parametrization of the dipole cross section to estimate the values of the gluon transport coefficient and of the higher twist matrix element, which is relevant for nuclear broadening. A considerable energy dependence of these quantities is found. In addition, numerical calculations are compared to data for nuclear broadening of Drell-Yan dileptons, J/psi and Upsilon mesons. The scale dependence of the strong coupling constant leads to measurable differences between the higher twist approach and the other two formalisms.Comment: 11 pages, 3 figures; v2: some changes in presentation, reference added, accepted for publication in PL

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Initial/final state interaction in di-jet production off nuclei

Cited by 4 publications

References 14 publications

Broadening of transverse momentum of partons propagating through a medium

Broadening of transverse momentum of partons propagating through a medium

Semihard Scattering Unraveled from Collective Dynamics by Two-Pion Azimuthal Correlations in158A GeV/c
Agakichiev¹,
Appelshäuser²,
Baur³
et al. 2004
Phys. Rev. Lett.

Relating different approaches to nuclear broadening

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Initial/final state interaction in di-jet production off nuclei

Cited by 4 publications

References 14 publications

Broadening of transverse momentum of partons propagating through a medium

Broadening of transverse momentum of partons propagating through a medium

Semihard Scattering Unraveled from Collective Dynamics by Two-Pion Azimuthal Correlations in158A GeV/cAgakichiev1, Appelshäuser2, Baur3 et al. 2004Phys. Rev. Lett.

Relating different approaches to nuclear broadening

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Semihard Scattering Unraveled from Collective Dynamics by Two-Pion Azimuthal Correlations in158A GeV/c
Agakichiev¹,
Appelshäuser²,
Baur³
et al. 2004
Phys. Rev. Lett.