<i>Chinatown</i> and the Private-Eye Film

Leitch, Thomas

doi:10.1017/cbo9780511606458.009

Cited by 7 publications

(14 citation statements)

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“…Once the colordipole cross section is determined, predictions for these observables can be made with no parameters to be adjusted [15]. Transverse momentum broadening in Drell-Yan production has been recently measured with good accuracy in p + A collisions in the E866 experiment at FermiLab [4,5,36] with E p = 800 GeV. In this paper, we have applied our theory to the FermiLab data.…”

Section: Discussionmentioning

confidence: 99%

“…The values of x 1 and x 2 relevant to the data for E772 are in the range 0.07 < x 2 < 0.13 and 0.33 < x 1 < 0.43 [35]. The E866 data covers the range .02 < x 2 < .08, with x 1 = 0.46 and M = 4.6 GeV [36]. The values of p T cover the range from 0 to about 5 GeV/c.…”

Section: Coherence Length Vs Transverse Momentummentioning

confidence: 93%

“…This calculation entails integrating the product of S 1 (ᾱ 1 , p T , k T ), given in Eq. (36), and σ pp DY (k T ) over k T using the parametrizations ofᾱ 1 (k T ) and σ pp DY (k T ). We will see in the next section that the transverse momentum dependence ofᾱ 1 (k T ) and σ pp DY (k T ) are key ingredients for understanding ∆ p 2 T .…”

Section: Comparison To Fermilab E866 Dy Momentum Distributionsmentioning

confidence: 99%

“…(1) found in Refs. [4,5,36]. The cross sections appearing in these ratios are doubly differential distributions binned in M 2 (or x 1 ) and x 2 ,…”

Section: Comparison To Fermilab E866 Dy Momentum Distributionsmentioning

confidence: 99%

“…The data is binned in unique x 2 intervals within a tight range in x 1 , i.e. x 1 ≈ 0.46 [36]. Of these sets, those which have 0.1 > x 2 > 0.05 correspond to the short-coherence length limit, ℓ c < 2 fm, where the momentum broadening is determined by initial state interactions, and it is this data set to which we compare our theory.…”

Section: Comparison To Fermilab E866 Dy Momentum Distributionsmentioning

confidence: 99%

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Cronin effect in the Drell-Yan reaction

2007

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We explore the mechanism of transverse momentum broadening of fast quarks propagating in nuclei, using Drell-Yan (DY) transverse momentum distributions measured in the experiment E866 at FermiLab with beams of 800 GeV protons. Our theoretical analysis is based on the color dipole approach in the target rest frame, which has provided a successful phenomenological description of a variety of hadronic reactions. The present application is relevant to the regime of short coherence length (SCL), where the spatial extent of the fluctuations of the projectile responsible for the Drell-Yan reaction is short compared to the internucleon spacing. In this limit, momentum broadening comes from initial state interactions and is described as color filtering, i.e. absorption of large-size dipoles leading to diminished transverse separation and hence enhanced transverse momentum. The predictions we present are in good agreement with the E866 data. The interactions leading to the acquisition of transverse momentum arise from the color-dipole cross section determined previously from deep-inelastic scattering on proton targets. Aside from the determination of the color-dipole cross section, no other phenomenological input is needed to explain the experimental results. The mean-square momentum broadening of dileptons determined in a recent separate analysis of the data is likewise well described by our theory. These results confirm within the model studied that the origin of momentum broadening in DY is the color dipole cross section mediating soft initial state interactions between the parton of the projectile that initiates the reaction and the nucleons of the nucleus, as provided by the color dipole description. Predictions for broadening observables at RHIC are presented.

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Section: Discussionmentioning

confidence: 99%

Section: Coherence Length Vs Transverse Momentummentioning

confidence: 93%

Section: Comparison To Fermilab E866 Dy Momentum Distributionsmentioning

confidence: 99%

“…(1) found in Refs. [4,5,36]. The cross sections appearing in these ratios are doubly differential distributions binned in M 2 (or x 1 ) and x 2 ,…”

Section: Comparison To Fermilab E866 Dy Momentum Distributionsmentioning

confidence: 99%

Section: Comparison To Fermilab E866 Dy Momentum Distributionsmentioning

confidence: 99%

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Cronin effect in the Drell-Yan reaction

2007

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A possible determination of the quark radiation length in cold nuclear matter

2011

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We calculate the differential Drell-Yan production cross section in proton-nucleus collisions by including both next-to-leading order perturbative effects and effects of the nuclear medium. We demonstrate that dilepton production in fixed target experiments is an excellent tool to study initial-state parton energy loss in large nuclei and to accurately determine the stopping power of cold nuclear matter. We provide theoretical predictions for the attenuation of the Drell-Yan cross section at large values of Feynman xF and show that for low proton beam energies experimental measurements at Fermilab's E906 can clearly distinguish between nuclear shadowing and energy loss effects. If confirmed by data, our results may help determine the quark radiation length in cold nuclear matter X0 ∼ 10 −13 m.

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Nuclear shadowing in electro-weak interactions

Kopeliovich

Morfín

Schmidt

2013

Progress in Particle and Nuclear Physics

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Shadowing is a quantum phenomenon leading to a non-additivity of electroweak cross sections on nucleons bound in a nucleus. It occurs due to destructive interference of amplitudes on different nucleons. Although the current experimental evidence for shadowing is dominated by chargedlepton nucleus scattering, studies of neutrino nucleus scattering have recently begun and revealed unexpected results.

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Chinatown and the Private-Eye Film

Cited by 7 publications

References 0 publications

Cronin effect in the Drell-Yan reaction

Cronin effect in the Drell-Yan reaction

A possible determination of the quark radiation length in cold nuclear matter

Nuclear shadowing in electro-weak interactions

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