Glauber-based evaluations of the odd moments of the initial eccentricity relative to the even order participant planes

Lacey, R.; Wei, R.; Ajitanand, N. N.; Alexander, J.; Jia, J.; Taranenko, A.

doi:10.1103/physrevc.84.027901

Cited by 13 publications

(9 citation statements)

References 38 publications

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“…Studies of correlations between the harmonic flow components were presented in Refs. [23,25,28,35]. We note that the experiment shows a strong correlation between 2 and 4 [45,46], while a weak correlation between 2 and 3 is found [47], where n denotes the principal axis associated with the nth harmonic flow [18].…”

Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

“…Many recent analyses are devoted to the studies of the initial geometry and its influence for the further stages of the evolution and the observed quantities, both in approaches involving the Glauber model [18][19][20][21][22][23][24][25][26][27][28][29][30][31][32][33][34][35][36] and the glasma [32,[37][38][39][40][41][42][43][44]. Studies of correlations between the harmonic flow components were presented in [23,25,28,35]. We note that the experiment shows a strong correlation between Φ 2 and Φ 4 [45,46], while a weak correlation between Φ 2 and Φ 3 is found [47], where Φ n denotes the principal axis associated with the n-th harmonic flow [18].…”

Section: Introductionmentioning

confidence: 99%

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Influence of initial fluctuations on geometry measures in relativistic U+U and Cu+Au collisions

2013

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In the framework of the Glauber approach we investigate the influence of the initial fluctuations on various measures of the initial-state geometry in 63 Cu + 197 Au and 238 U + 238 U relativistic ion collisions. Comparing variants of the Glauber model (the wounded-nucleon model, the mixed model, and the hot-spot model) we indicate sensitivity of certain observables, in particular for the azimuthal eccentricity parameters as well as for the correlation of directions of the principal axes associated with the Fourier components. The effects of the nuclear deformation for the initial geometry are investigated. We apply GLISSANDO in our analysis.

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Section: Introductionmentioning

confidence: 86%

Section: Introductionmentioning

confidence: 99%

Section: Introductionmentioning

confidence: 99%

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Influence of initial fluctuations on geometry measures in relativistic U+U and Cu+Au collisions

2013

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“…The triangular component generates a triangular (third-order harmonic) flow (v 3 ) in the final-state momentum space. Since the third-order harmonic plane (ψ 3 ) is random with respect to the RP [168], the CME signal is averaged to zero when analyzed with respect to ψ 3 by measuring cos(φ α + φ β − 2ψ 3 ) . The background, on the other hand, is due to intrinsic particle correlations and is coupled to the harmonic plane by anisotropic flow.…”

Section: A Background-only Three-point Correlatormentioning

confidence: 99%

Experimental searches for the chiral magnetic effect in heavy-ion collisions

Zhao

Wang

2019

Progress in Particle and Nuclear Physics

108

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The chiral magnetic effect (CME) in quantum chromodynamics (QCD) refers to a charge separation (an electric current) of chirality imbalanced quarks generated along an external strong magnetic field. The chirality imbalance results from interactions of quarks, under the approximate chiral symmetry restoration, with metastable local domains of gluon fields of non-zero topological charges out of QCD vacuum fluctuations. Those local domains violate the P and CP invariance, potentially offering a solution to the strong CP problem in explaining the magnitude of the matterantimatter asymmetry in today's universe. Relativistic heavy-ion collisions, with the likely creation of the high energy density quark-gluon plasma and restoration of the approximate chiral symmetry, and the possibly long-lived strong magnetic field, provide a unique opportunity to detect the CME. Early measurements of the CME-induced charge separation in heavy-ion collisions are dominated by physics backgrounds. Major efforts have been devoted to eliminate or reduce those backgrounds. We review those efforts, with a somewhat historical perspective, and focus on the recent innovative experimental undertakings in the search for the CME in heavy-ion collisions.Keywords: heavy-ion collisions, chiral magnetic effect, three-point correlator, elliptic flow background, invariant mass, harmonic plane Our universe started from the Big Bang singularity [1] with equal amounts of matter and antimatter, but is today dominated by only matter. No significant concentration of antimatter has ever been found in the observable universe [2]. This matter-antimatter asymmetry is caused by CP (chargeconjugation parity) violation, a slight difference in the physics governing matter and antimatter [3,4], as in e.g. electroweak baryogenesis [5,6]. CP is violated in the weak interaction but the magnitude of the CKM quark-sector CP violation [7,8] is too small to explain the present universe matter-antimatter asymmetry [9]. It is unclear whether the lepton-sector CP violation through leptogenesis [3,10] is large enough to account for the matter-antimatter asymmetry. CP violation in the strong interaction in the early universe may be needed. CP violation is not prohibited in the strong interaction [11] but none has been experimentally observed [12,13]. This is called the strong CP problem [11,14]. To solve the strong CP problem, Peccei and Quinn [14,15] proposed to extend the QCD (quantum chromodynamics) Lagrangian by a CP-violating θ term, first introduced by 't Hooft [16,17] in resolving the axial U (1) problem [18]. It predicts the existence of a new particle called the axion. If axions exist, they would not only offer a solution to the strong CP problem, but could also be a dark matter candidate [19]. On the other hand, the Peccei-Quinn mechanism would remove the large, flavour diagonal CP violation, precluding a solution to the strong CP problem to arise from QCD. However, axions have not been detected after four decades of search since its conception [20,21].Here, we concent...

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“…The eccentricities ǫ n are of interest because through hydrodynamic response they generate the flow harmonics and angular correlations in the final state of heavy-ion collisions [21][22][23][24][25][26][27][28][29][30][31][32][33]. (Fluctuations in small-x evolution may also lead to detectable azimuthal momentum anisotropies in high-multiplicity pp collisions at the LHC [6] which are not due to "flow").…”

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confidence: 99%

Scaling of fluctuations inppandpAcollisions, and eccentricities in relativistic heavy-ion collisions

Dumitru

Nara

2012

Phys. Rev. C

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Glauber-based evaluations of the odd moments of the initial eccentricity relative to the even order participant planes

Cited by 13 publications

References 38 publications

Influence of initial fluctuations on geometry measures in relativistic U+U and Cu+Au collisions

Influence of initial fluctuations on geometry measures in relativistic U+U and Cu+Au collisions

Experimental searches for the chiral magnetic effect in heavy-ion collisions

Scaling of fluctuations inppandpAcollisions, and eccentricities in relativistic heavy-ion collisions

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