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Adams, J. R.; Aggarwal, M. M.; Ahammed, Z.; Amonett, J.; Anderson, B. D.; Arkhipkin, D.; Averichev, G. S.; Badyal, S. K.; Bai, Y.; Balewski, J.; Barannikova, O.; Barnby, L. S.; Baudot, J.; Bekele, S.; Belaga, V. V.; Bellingeri-Laurikainen, A.; Bellwied, R.; Berger, J.; Bezverkhny, B. I.; Bharadwaj, Samarth; Bhasin, A.; Bhati, A. K.; Bhatia, V. S.; Bichsel, H.; Bielčík, J.; Bielčíková, J.; Billmeier, A.; Bland, L. C.; Blyth, C. O.; Blyth, S.; Bonner, B. E.; Botje, M.; Boucham, A.; Bouchet, J.; Brandin, A. V.; Bravar, A.; Bysterský, M.; Cadman, R. V.; Cai, X. Z.; Caines, H.; Sánchez, M. Calderón De La Barca; Castillo, J.; Catu, O.; Cebra, D.; Chajęcki, Z.; Chaloupka, P.; Chattopadhyay, S.; Chen, H. F.; Chen, J. H.; Chen, Y.; Cheng, J.; Cherney, M.; Chikanian, A.; Choi, H. A.; Christie, W.; Coffin, J. P.; Cormier, T. M.; Cosentino, M. R.; Cramer, J. G.; Crawford, H. J.; Das, D.; Das, Sudipta; Daugherity, M.; Moura, M. M. de; Dedovich, T. G.; Dephillips, M.; Derevschikov, A. 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doi:10.1016/j.physletb.2006.01.061

Cited by 31 publications

(42 citation statements)

References 30 publications

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“…Pair densities S N and B N are equivalent to pair numbersn ab defined in Ref. [5,6], with sibling-to-mixed pair ratior ab =n ab,sib /n ab,mix for 2D bins (a, b) on difference variables η ∆ = η 1 − η 2 (pseudorapidity) and φ ∆ = φ 1 − φ 2 (azimuth). The CMS correlation measure is R(∆η, ∆φ) = ( N − 1)…”

Section: A Cms Analysis Methodsmentioning

confidence: 99%

See 1 more Smart Citation

Comparing the same-side ridge inp−pangular correlations at 7 TeV to data measured at the BNL Relativistic Heavy Ion Collider

Trainor

Kettler

2011

Phys. Rev. C

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The CMS collaboration has recently reported the appearance of a same-side ridge structure in two-particle angular correlations from 7 TeV p-p collisions. The ridge in p-p collisions at 7 TeV has been compared to a ridge structure in more-central Au-Au collisions at 200 GeV, interpreted by some as evidence for a dense, flowing QCD medium. In this study we make a detailed comparison between 200 GeV p-p correlations and the CMS results. We find that 7 TeV minimum-bias jet correlations are remarkably similar to those at 200 GeV, even to the details of the same-side peak geometry. Appearance of a same-side ridge reflects a change in the sign of the azimuth curvature determined by the ratio of azimuth quadrupole to dipole amplitudes. Extrapolation of quadrupole systematics from 200 GeV suggests that the same-side ridge at 7 TeV is a manifestation of the quadrupole amplitude enhanced relative to the dipole by the energy increase and applied cuts.

show abstract

Section: A Cms Analysis Methodsmentioning

confidence: 99%

“…For our initial angular correlation analysis we adopted n ch ( r − 1) as the correlation measure, where n ch is the charged-particle multiplicity within the detector angular acceptance (∆η, ∆φ) [5,6]. Sibling and mixed pair numbers are normalized to unit integral, and pair ratior is averaged over kinematic bins (e.g.…”

Section: A Correlation Measuresmentioning

confidence: 99%

Comparing the same-side ridge inp−pangular correlations at 7 TeV to data measured at the BNL Relativistic Heavy Ion Collider

Trainor

Kettler

2011

Phys. Rev. C

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“…η Σ = η 1 +η 2 ) angular correlations can be projected by averaging onto difference variables (e.g. η ∆ = η 1 − η 2 ) without loss of information to form angular autocorrelations [19,20]. 2D subspace (η ∆ , φ ∆ ) is then visualized.…”

Section: Basic 2d Angular Correlationsmentioning

confidence: 99%

“…Correlations can be measured with per-particle statistic ∆ρ/ √ ρ ref = ρ 0 ( r − 1), where ∆ρ = ρ sib − ρ ref is the correlated-pair density, ρ sib is the sibling (sameevent) pair density, ρ ref is the reference or mixed-event pair density, r is the mean sibling/mixed pair-number ratio, and prefactor ρ 0 =n ch /∆η ∆φ ≈ d 2 n ch /dηdφ is the charged-particle 2D angular density averaged over some angular acceptance (∆η, ∆φ) [3,20]. Factorization…”

Section: B Correlation Measuresmentioning

confidence: 99%

Challenging claims of nonjet “higher harmonic” components in 2D angular correlations from high-energy heavy-ion collisions

2012

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Background: Possible evidence for triangular flow and other "higher harmonic flows" in high energy nucleus-nucleus collisions has received much attention recently. It is conjectured that several higher harmonic flows vm may result from initial-state geometry fluctuations in A-A collisions coupled to a radially-expanding medium. But as with "elliptic flow" v2 measurements, nonhydrodynamic mechanisms such as jet production may contribute to other higher azimuth multipoles vm as biases. Purpose: Careful distinctions should be maintained between jet-related and nonjet (possibly hydrodynamic) contributions to vm (e.g., "nonflow" and "flow"). In this study we consider several questions: (a) To what extent do jet-like structures in two-dimensional (2D) angular correlations contribute to azimuth multipoles inferred from various vm methods? (b) If a multipole element is added to a 2D fit model is a nonzero amplitude indicative of a corresponding flow component? and (c) Can 2D correlations establish the necessity of nonjet contributions to some or all higher multipoles? Method: Model fits to 2D angular correlations are used to establish the origins of azimuth multipoles inferred from 1D projections onto azimuth or from nongraphical numerical methods. Results: We find that jet-like angular correlations, and specifically a 2D peak at the angular origin consistent with jet production, constitute the dominant contribution to inferred higher multipoles, and the data do not require higher multipoles in isolation from the jet-like 2D peak. Conclusions: Inference of "higher harmonic flows" results from identifying certain nominally jetlike structure as flow manifestations through unjustified application of 1D Fourier series analysis. Although the peak structure at the angular origin is strongly modified in more-central collisions some properties remain compatible with relevant pQCD theory expectations for jet production.

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“…Quadrupole correlations in Au-Au collisions at RHIC are also charge-independent within errors [2,3,6]. Nonzero charge-dependent angular correlations in Au-Au collisions at RHIC extend out to only 2 units on relative η [46]. The CMS results in Figs.…”

Section: Discussionmentioning

confidence: 86%

Phenomenological analysis of angular correlations in 7 TeV proton-proton collisions from the CMS experiment

Ray

2011

Phys. Rev. D

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A phenomenological analysis is presented of recent two-particle angular correlation data on relative pseudorapidity (η) and azimuth reported by the Compact Muon Solenoid (CMS) Collaboration for √ s = 7 TeV proton-proton collisions. The data are described with an empirical jet-like model developed for similar angular correlation measurements obtained from heavy ion collisions at the Relativistic Heavy Ion Collider (RHIC). The same-side (small relative azimuth), η-extended correlation structure, referred to as the ridge, is compared with three phenomenological correlation structures suggested by theoretical analysis. These include additional angular correlations due to soft gluon radiation in 2 → 3 partonic processes, a one-dimensional same-side correlation ridge on azimuth motivated for example by color-glass condensate models, and an azimuth quadrupole similar to that required to describe heavy ion angular correlations. The quadrupole model provides the best overall description of the CMS data, including the ridge, based on χ 2 minimization in agreement with previous studies. Implications of these results with respect to possible mechanisms for producing the CMS same-side correlation ridge are discussed.

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Hadronization geometry from net-charge angular correlations on momentum subspace (η,ϕ) in Au–Au collisions at sNN

Cited by 31 publications

References 30 publications

Comparing the same-side ridge inp−pangular correlations at 7 TeV to data measured at the BNL Relativistic Heavy Ion Collider

Comparing the same-side ridge inp−pangular correlations at 7 TeV to data measured at the BNL Relativistic Heavy Ion Collider

Challenging claims of nonjet “higher harmonic” components in 2D angular correlations from high-energy heavy-ion collisions

Phenomenological analysis of angular correlations in 7 TeV proton-proton collisions from the CMS experiment

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