On the peripheral tube description of the two-particle correlations in nuclear collisions

Wen, Dan; Castilho, Wagner Maciel; Lin, Kai; Qian, Wei-Liang; Hama, Yogiro; Kodama, T.

doi:10.1088/1361-6471/ab01b7

Cited by 8 publications

(12 citation statements)

References 120 publications

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“…39. The calculated two-particle correlations by using one-tube IC for 20% − 40% centrality window in comparison with the corresponding data by PHINEX Collaboration [61], and those obtained by using the extracted paramters [79]. The SPheRIO results from using the cumulant method are shown in red solid curves, the data are shown in solid squares, and those obtained by the estimated parameters are shown by the blue hatched curves.…”

Section: Fig 38 Color Online)mentioning

confidence: 94%

“…Such an explanation also naturally describes some of the features observed in data analysis, which is less intuitive otherwise. The remainder of this section is dedicated to study the triggerangle dependence [63][64][65]67], centrality dependence [66] of di-hadron correlation in Au+Au collisions, as well as the extracted model paremeters [79] in comparison with the data.…”

Section: Some Observed Properties and Relation With The Peripheral Tubesmentioning

confidence: 99%

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Two-particle correlations at high-energy nuclear collisions, peripheral-tube model revisited

Hama,

Kodama,

Qian

2020

Preprint

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In this paper, we give an account of the peripheral-tube model, which has been developed to give an intuitive and dynamical description of the so-called ridge effect in two-particle correlations in high-energy nuclear collisions. Starting from a realistic event-by-event fluctuating hydrodynamical model calculation, we first show the emergence of ridge + shoulders in the so-called two-particle long-range correlations, reproducing the data. In contrast to the commonly used geometric picture of the origin of the anisotropic flow, we can explain such a structure dynamically in terms of the presence of high energy-density peripheral tubes in the initial conditions. These tubes violently explode and deflect the near radial flow coming from the interior of the hot matter, which in turn produces a two-ridge structure in single-particle distribution, with approximately two units opening in azimuth. When computing the two-particle correlation, this will result in characteristic threeridge structure, with a high near-side ridge and two symmetric lower away-side ridges or shoulders. Several anisotropic flows, necessary to producing ridge + shoulder structure, appear naturally in this dynamical description. Using this simple idea, we can understand several related phenomena, such as centrality dependence and trigger-angle dependence.

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Section: Fig 38 Color Online)mentioning

confidence: 94%

Section: Some Observed Properties and Relation With The Peripheral Tubesmentioning

confidence: 99%

Two-particle correlations at high-energy nuclear collisions, peripheral-tube model revisited

Hama,

Kodama,

Qian

2020

Preprint

Self Cite

View full text Add to dashboard Cite

show abstract

“…It has been suggested by the NeXSPheRIO model [105,[109][110][111][112][113] that initial energy density fluctuations (hot spots) with subsequent hydro evolution may generate a near-side ridge and a double-peak correlation on the away side. The physics mechanism appears to be sidesplashes of particles by the hot spot on the surface resulting in two peaks in the single particle azimuthal distribution event-by-event separated by about two radians [109,110].…”

Section: F Effect Of Higher Order Harmonics ∆ηmentioning

confidence: 99%

Measurements of dihadron correlations relative to the event plane in Au+Au collisions at GeV *

Agakishiev¹,

Aggarwal²,

Ahammed³

et al. 2021

Chinese Phys. C

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Dihadron azimuthal correlations containing a high transverse momentum ( ) trigger particle are sensitive to the properties of the nuclear medium created at RHIC through the strong interactions occurring between the traversing parton and the medium, i.e. jet-quenching. Previous measurements revealed a strong modification to dihadron azimuthal correlations in Au+Au collisions with respect to p+p and d+Au collisions. The modification increases with the collision centrality, suggesting a path-length or energy density dependence to the jet-quenching effect. This paper reports STAR measurements of dihadron azimuthal correlations in mid-central (20%-60%) Au+Au collisions at GeV as a function of the trigger particle's azimuthal angle relative to the event plane, . The azimuthal correlation is studied as a function of both the trigger and associated particle . The subtractions of the combinatorial background and anisotropic flow, assuming Zero Yield At Minimum (ZYAM), are described. The correlation results are first discussed with subtraction of the even harmonic (elliptic and quadrangular) flow backgrounds. The away-side correlation is strongly modified, and the modification varies with , with a double-peak structure for out-of-plane trigger particles. The near-side ridge (long range pseudo-rapidity correlation) appears to drop with increasing while the jet-like component remains approximately constant. The correlation functions are further studied with the subtraction of odd harmonic triangular flow background arising from fluctuations. It is found that the triangular flow, while responsible for the majority of the amplitudes, is not sufficient to explain the -dependence of the ridge or the away-side double-peak structure. The dropping ridge with could be attributed to a -dependent elliptic anisotropy; however, the physics mechanism of the ridge remains an open question. Even with a -dependent elliptic flow, the away-side correlation structure is robust. These results, with extensive systematic studies of the dihadron correlations as a function of , trigger and associated particle , and the pseudo-rapidity range , should provide stringent inputs to help understand the underlying physics mechanisms of jet-medium interactions in high energy nuclear collisions.

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“…Such an explanation also naturally describes some of the features observed in data analysis, which is less intuitive otherwise. The remainder of this section is dedicated to study the trigger-angle dependence [63][64][65]67], centrality dependence [66] of di-hadron correlation in Au + Au collisions, as well as the extracted model parameters [79] in comparison with the data.…”

Section: Some Observed Properties and Relation With The Peripheral Tubesmentioning

confidence: 99%

“…In this section, we shift the focus onto the model parameters [79]. In particular, instead of numerical calibration, we extract the model parameters according to their respective physical interpretations.…”

Section: Extracted Model Parametersmentioning

confidence: 99%

Two-particle correlations at high-energy nuclear collisions, peripheral-tube model revisited

Hama¹,

Kodama²,

Qian³

2020

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

Self Cite

View full text Add to dashboard Cite

In this paper, we give an account of the peripheral-tube model, which has been developed to give an intuitive and dynamical description of the so-called ridge effect in two-particle correlations in high-energy nuclear collisions. Starting from a realistic event-by-event fluctuating hydrodynamical model calculation, we first show the emergence of ridge + shoulders in the so-called two-particle long-range correlations, reproducing the data. In contrast to the commonly used geometric picture of the origin of the anisotropic flow, we can explain such a structure dynamically in terms of the presence of high energy-density peripheral tubes in the initial conditions. These tubes violently explode and deflect the near radial flow coming from the interior of the hot matter, which in turn produces a two-ridge structure in single-particle distribution, with approximately two units opening in azimuth. When computing the two-particle correlation, this will result in characteristic three-ridge structure, with a high near-side ridge and two symmetric lower away-side ridges or shoulders. Several anisotropic flows, necessary to producing ridge + shoulder structure, appear naturally in this dynamical description. Using this simple idea, we can understand several related phenomena, such as centrality dependence and trigger-angle dependence.

show abstract

On the peripheral tube description of the two-particle correlations in nuclear collisions

Cited by 8 publications

References 120 publications

Two-particle correlations at high-energy nuclear collisions, peripheral-tube model revisited

Two-particle correlations at high-energy nuclear collisions, peripheral-tube model revisited

Measurements of dihadron correlations relative to the event plane in Au+Au collisions at GeV *

Two-particle correlations at high-energy nuclear collisions, peripheral-tube model revisited

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