The search for a ridge structure origin with shower broadening and jet quenching

Mizukawa, R.; Hirano, Tetsufumi; Isse, M.; Nara, Yasushi; Ohnishi, Akira

doi:10.1088/0954-3899/35/10/104083

Cited by 12 publications

(13 citation statements)

References 19 publications

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“…Similar ∆φ-∆η correlations associated with a near-side jet have also been observed by the PHENIX Collaboration [16,17] and the PHOBOS Collaboration [18]. While many theoretical models [19,20,21,22,23,24,25,26,27,28,29,30,31,32,33,34,35] have been proposed to discuss the jet structure and related phenomena, the ridge phenomenon has not yet been fully understood.…”

Section: Introductionsupporting

confidence: 56%

Momentum kick model description of the near-side ridge and jet quenching

Wong

2008

Phys. Rev. C

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In the momentum kick model, a near-side jet emerges near the surface, kicks medium partons, loses energy, and fragments into the trigger particle and fragmentation products. The kicked medium partons subsequently materialize as the observed ridge particles, which carry direct information on the magnitude of the momentum kick and the initial parton momentum distribution at the moment of jet-(medium parton) collisions. The initial parton momentum distribution extracted from the STAR ridge data for central AuAu collisions at √ sNN = 200 GeV has a thermal-like transverse momentum distribution and a rapidity plateau structure with a relatively flat distribution at midrapidity and sharp kinematic boundaries at large rapidities. Such a rapidity plateau structure may arise from particle production in flux tubes, as color charges and anti-color charges separate at high energies. The centrality dependence of the ridge yield and the degree of jet quenching can be consistently described by the momentum kick model.

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Section: Introductionsupporting

confidence: 56%

Momentum kick model description of the near-side ridge and jet quenching

Wong

2008

Phys. Rev. C

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“…The hard ridge has most commonly been described as a consequence of the jet passing through the flowing bulk matter produced by the nuclear collision [24,25,26,27,28,29,30,31,32]. While in principle jets and minijets may contribute to the soft ridge [33], the overwhelming success of hydrodynamics at low p t suggests both effects play a role.…”

Section: Introductionmentioning

confidence: 99%

Soft contribution to the hard ridge in relativistic nuclear collisions

Moschelli

Gavin

2010

Nuclear Physics A

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Nuclear collisions exhibit long-range rapidity correlations not present in proton-proton collisions. Because the correlation structure is wide in relative pseudorapidity and narrow in relative azimuthal angle, it is known as the ridge. Similar ridge structures are observed in correlations of particles associated with a jet trigger (the hard ridge) as well as correlations without a trigger (the soft ridge). Earlier we argued that the soft ridge arises when particles formed in an early Glasma stage later manifest transverse flow. We extend this study to address new soft ridge measurements. We then determine the contribution of flow to the hard ridge.

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“…The Jet Broadening models [37,38,39,40] consider the ridge particles as arising from radiated gluons of the incident jet; they have not been compared quantitatively with the ridge data. Taking the features of jet broadening as free parameters in a hydrodynamical calculation leads to a theoretical jet peak to ridge ratio large in comparison with experiment [41]. The possibility of the intermediate p t trigger arising from the mediummedium recombination adds further complications to the analysis of the ridge phenomenon [42,43].…”

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confidence: 99%

Momentum kick model analysis of PHENIX near-side ridge data and photon jet

Wong

2009

Phys. Rev. C

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We analyze PHENIX near-side ridge data for central Au+Au collisions at √ sNN = 200 GeV with the momentum kick model, in which a near-side jet emerges near the surface, kicks medium partons, loses energy, and fragments into the trigger particle and fragmentation products. The kicked medium partons subsequently materialize as the observed ridge particles, which carry direct information on the early parton momentum distribution and the magnitude of the momentum kick. We find that the PHENIX ridge data can be described well by the momentum kick model and the extracted early partons momentum distribution has a thermal-like transverse distribution and a rapidity plateau structure. We also find that the parton-parton scattering between the jet parton and the medium parton involves the exchange of a non-perturbative pomeron, for jet partons in momentum range considered in the near-side ridge measurements. PACS numbers: 25.75.Gz 25.75.Dw I. INTRODUCTIONRecently, the STAR Collaboration [1,2,3,4,5,6,7,8,9,10,11,12,13] observed a ∆φ-∆η correlation of particles associated with a high-p t near-side hadron trigger particle in central Au+Au collisions at √ s N N = 200 GeV, where ∆φ and ∆η are the azimuthal angle and pseudorapidity differences measured relative to the trigger particle, respectively. Particles associated with the near-side jet can be decomposed into a "jet component" at (∆φ, ∆η)∼(0,0), and a "ridge component" at ∆φ∼0 with a ridge structure in ∆η. A similar correlation with a high-p t trigger has also been observed by the PHENIX Collaboration [14,15,16] and the PHOBOS Collaboration [17]. Recent reviews of the ridge phenomenon have also been presented [18,19,20].In this manuscript, we shall limit our attention to the ridge phenomenon involving a high p t jet on the near-side. We shall not consider ridge-type ∆φ-∆η correlations that have also been observed between two low-p t hadrons [21], as they do not involve the occurrence of a high-p t jet on the near-side. ] have been proposed to discuss the ridge phenomenon. The model of Ref. [27] assumes that the ridge particles arise from the extra particles deposited by the forward and backward beam jets at the source point associated with the two transverse jets. The correlation of the jet source transverse position and the transverse medium flow then leads to an azimuthal distribution with a width in ∆φ [27,28]. The width in ∆φ obtained from such a model is wide in comparison with experimental data [27]. The Correlated Emission Model [29,30,31,32] assumes that ridge particles arise from soft thermal gluons radiated along the jet direction, with an enhancement due to the radial flow. The models of Refs. [27] and [29] deal with the azimuthal correlations in the central rapidity region, and the pseudorapidity correlation has not yet been considered. The back-splash model assumes that the ridge on the near-side arises from the hydrodynamical back-splash of the away-side jet flow [33]; hydrodynamical calculations for such a model has not yet been made. The Glasma model examine...

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The search for a ridge structure origin with shower broadening and jet quenching

Cited by 12 publications

References 19 publications

Momentum kick model description of the near-side ridge and jet quenching

Momentum kick model description of the near-side ridge and jet quenching

Soft contribution to the hard ridge in relativistic nuclear collisions

Momentum kick model analysis of PHENIX near-side ridge data and photon jet

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