Transverse-momentumptcorrelations on (η, phi) from mean-ptfluctuations in Au–Au collisions at GeV

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.; Sanchez, M. De La Calderón 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. A.; Didenko, L.; Dietel, T.; Dogra, S.; Dong, W. J.; Dong, X.; Draper, J. E.; Du, F.; Dubey, A. K.; Dunin, V. B.; Dunlop, J. C.; Mazumdar, M. R. Dutta; Eckardt, V.; Edwards, W. R.; Efimov, L. G.; Емелянов, В.; Engelage, J.; Eppley, G.; Erazmus, B.; Estienne, M.; Fachini, P.; Faivre, J.; Fatemi, R.; Fedorišin, J.; Filimonov, K.; Filip, P.; Finch, E.; Fine, V.; Fisyak, Y.; Fornazier, Karin S. F.; Fu, Jiang; Gagliardi, C. A.; Gaillard, L.; Gans, J.; Ganti, M. S.; Geurts, F. J. M.; Ghazikhanian, V.; Ghosh, P.; Gonzalez, J. E.; Gos, H.; Grachov, O.; Grebenyuk, O. G.; Grosnick, D.; Guertin, S. M.; Guo, Y.; Gupta, A.; Gupta, N.; Gutierrez, T. D.; Hallman, T. J.; Hamed, A.; Hardtke, D.; Harris, J. W.; Heinz, M.; Henry, T. W.; Hepplemann, S.; Hippolyte, B.; Hirsch, A.; Hjort, E.; Hoffmann, G. W.; Horner, M. J.; Huang, H. Z.; Huang, S.; Hughes, E. W.; Humanic, T. J.; Igo, G.; Ishihara, A.; Jacobs, P.; Jacobs, W. W.; Jedynak, Maciej; Jiang, H.; Jones, P. G.; Judd, E. G.; Kabana, S.; Kang, K.; Kaplan, M.; Keane, D.; Kechechyan, A.; Khodyrev, V. Yu; Kim, B. C.; Kiryluk, J.; Kisiel, A.; Kislov, E. M.; Klay, J. L.; Klein, S. R.; Koetke, D. D.; Kollegger, T.; Kopytine, M.; Kotchenda, L.; Kowalik, K.; Kramer, M.; Кравцов, П.; Kravtsov, V. I.; Krueger, K.; Kuhn, C.; Куликов, А. И.; Kumar, Ajay; Kutuev, R.Kh.; Кузнецов, А. А.; Lamont, M. A.C.; Landgraf, J. M.; Lange, S.; Laue, F.; Lauret, J.; Lebedev, A.; Lednický, R.; Lee, C. H.; Lehocká, S.; LeVine, M. J.; Li, C.; Li, Q.; Li, Y.; Lin, G.; Lindenbaum, S. J.; Lisa, M. A.; Liu, F.; Liu, H.; Liu, J.; Liu, L.; Liu, Q. J.; Liu, Z.; Ljubičić, T.; Llope, W. J.; Long, H.; Longacre, R. S.; Lopez-Noriega, M.; Love, W. A.; Lu, Y.; Ludlam, T.; Lynn, D.; L., G.; G., J.; G., Y.; Magestro, D.; Mahajan, S.; Mahapatra, D. P.; Majka, R.; Mangotra, L. K.; Manweiler, R.; Margetis, S.; Markert, C.; Martin, L.; Marx, J. N.; Matis, H. S.; Matulenko, Yu. A.; McClain, C. J.; McShane, T. S.; Meißner, F.; Melnick, Yu; Meschanin, A.; Miller, Michael L.; Minaev, N. G.; Mironov, C.; Mischke, A.; Mishra, D.; Mitchell, J. T.; Mohanty, B.; Molnár, L.; Moore, C. F.; Морозов, Д. А.; Munhoz, M. G.; Nandi, B. K.; Nayak, S. K.; Nayak, T. K.; Nelson, J. M.; Netrakanti, P. K.; Никитин, В. А.; Nogach, L. V.; Nurushev, S. B.; Odyniec, G.; Ogawa, A.; Okorokov, V.; Oldenburg, M.; Olson, D.; Pal, S. K.; Panebratsev, Y.; Panitkin, S.; Pavlinov, A. I.; Pawlak, T.; Peitzmann, T.; Perevoztchikov, V.; Perkins, C.; Peryt, W.; Петров, В. А.; Phatak, S. C.; Picha, R.; Planinić, M.; Pluta, J.; Porile, N.; Porter, J.; Poskanzer, A. M.; Potekhin, M.; Potrebenikova, E.; Potukuchi, B.; Prindle, D.; Pruneau, C.; Putschke, J.; Rakness, G.; Raniwala, R.; Raniwala, S.; Ravel, O.; Ray, R. L.; Razin, S. V.; Reichhold, D.; Reid, J. G.; Reinnarth, J.; Renault, G.; Retière, F.; Ridiger, A.; Ritter, H. G.; Roberts, J.; Rogachevskiy, O. V.; Romero, J. L.; Rose, A.; Roy, C.; Ruan, L.; Russcher, M. J.; Sahoo, R.; Sakrejda, I.; Salur, S.; Sandweiss, J.; Sarsour, M.; Savin, I.; Sazhin, P. S.; Schambach, J.; Scharenberg, R. P.; Schmitz, N.; Schweda, K.; Seger, J.; Selyuzhenkov, I.; Seyboth, P.; Shahaliev, E.; Shao, M.; Shao, W.; Sharma, M.; Shen, W. Q.; Shestermanov, K. E.; Shimanskiy, S. S.; Sichtermann, E. P.; Simon, F.; Singaraju, R.; Smirnov, N.; Snellings, Raimond; Sood, G.; Sorensen, P.; Sowiński, J.; Speltz, J.; Spinka, H.; Srivastava, B.; Stadnik, A.; Stanislaus, T. D. S.; Stock, R.; Stolpovsky, A.; Strikhanov, M.; Stringfellow, B.; Suaide, Alexandre Alarcon Do Passo; Sugarbaker, E.; Šumbera, M.; Surrow, B.; Swanger, M.; Symons, T. J. M.; Toledo, A. Szanto de; Tai, A.; Takahashi, J.; Tang, A. H.; Tarnowsky, T.; Thein, D.; Thomas, J. H.; Timmins, A. R.; Timoshenko, S.; Tokarev, M.; Trainor, T. A.; Trentalange, S.; Tribble, R. E.; Tsai, O. D.; Ulery, J.; Ullrich, T.; Underwood, D. G.; Buren, G. Van; Kolk, N. van der; Leeuwen, M. van; Molen, A. M. Vander; Varma, R.; Vasilevski, I. M.; Vasiliev, A.; Vernet, R.; Vigdor, S.E.; Viyogi, Y. P.; Vokál, S.; Voloshin, S. A.; Waggoner, W. T.; Wang, F.; Wang, G.; Wang, X. L.; Wang, Y.; Wang, Z. M.; Ward, H.; Watson, J. W.; Webb, J. C.; Westfall, G. D.; Wetzler, A.; Whitten, C.; Wieman, H.; Wissink, S. W.; Witt, R.; Wood, J. S.; Wu, J.; Xu, N.; Xu, Z.; Xu, Z.; Yamamoto, E.; Yepes, P.; Yoo, I. K.; Yurevich, V. I.; Zborovský, I.; Zhang, H.; Zhang, W. M.; Zhang, Y.; Zhang, Z. P.; Chen, Zhong; Zoulkarneev, R.; Zoulkarneeva, Y.; Zubarev, A. N.; Zuo, J. X.

doi:10.1088/0954-3899/32/6/l02

Cited by 79 publications

(13 citation statements)

References 25 publications

Supporting

Mentioning

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“…Information from p t angular correlations and single-particle spectra may help to reduce the ambiguity. p t angular correlations, complementary to number angular correlations from the present analysis, have been obtained by inversion of p t fluctuation scale dependence from 200-GeV Au-Au collisions [34,36,74]. The p t correlation structure is qualitatively similar to that presented here (e.g., SS 2D peak, AS ridge, quadrupole), but there are significant quantitative differences.…”

Section: Minijets and P T Angular Correlationssupporting

confidence: 72%

“…The data reveal that the η width of the SS 2D peak increases, but the azimuth width decreases with increasing centrality, inconsistent with random multiple scattering. A reduction in the p t SS peak amplitude is observed in data [74], but not until ν > 4, well above ν trans . The SS peak amplitude for number-correlations increases dramatically above ν trans .…”

Section: J Centrality Trends For Other Conventional Modelsmentioning

confidence: 83%

“…The correlation structures reported here and in Refs. [21,[36][37][38]43,74], if generated by semihard parton scattering and fragmentation, contradict the assumption of minijet thermalization.…”

Section: Minijets and Theorymentioning

confidence: 95%

“…A growing number of experimental results indicate that minijets make significant contributions to the transverse dynamics of nuclear collisions above √ s NN ∼ 13 GeV [21,25,36,62,64,74]. However, the phenomenological definition of minijets and their interpretation as true pQCD jets is not widely recognized within the heavy-ion community.…”

Section: Appendix A: Minijetsmentioning

confidence: 99%

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Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions atsNN=62and 200 GeV

Agakishiev¹,

Aggarwal²,

Ahammed³

et al. 2012

Phys. Rev. C

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We present two-dimensional (2D) two-particle angular correlations measured with the STAR detector on relative pseudorapidity η and azimuth φ for charged particles from Au-Au collisions at √ s NN = 62 and 200 GeV with transverse momentum p t 0.15 GeV/c, |η| 1, and 2π in azimuth. Observed correlations include a same-side (relative azimuth <π/2) 2D peak, a closely related away-side azimuth dipole, and an azimuth quadrupole conventionally associated with elliptic flow. The same-side 2D peak and away-side dipole are explained by semihard parton scattering and fragmentation (minijets) in proton-proton and peripheral nucleus-nucleus collisions. Those structures follow N -N binary-collision scaling in Au-Au collisions until midcentrality, where a transition to a qualitatively different centrality trend occurs within one 10% centrality bin. Above the transition point the number of same-side and away-side correlated pairs increases rapidly relative to binary-collision scaling, the η width of the same-side 2D peak also increases rapidly (η elongation), and the φ width actually decreases significantly. Those centrality trends are in marked contrast with conventional expectations for jet quenching in a dense medium. The observed centrality trends are compared to perturbative QCD predictions computed in HIJING, which serve as a theoretical baseline, and to the expected trends for semihard parton scattering and fragmentation in a thermalized opaque medium predicted by theoretical calculations and 064902-2 ANOMALOUS CENTRALITY EVOLUTION OF TWO-. . .PHYSICAL REVIEW C 86, 064902 (2012) phenomenological models. We are unable to reconcile a semihard parton scattering and fragmentation origin for the observed correlation structure and centrality trends with heavy-ion collision scenarios that invoke rapid parton thermalization. If the collision system turns out to be effectively opaque to few-GeV partons the present observations would be inconsistent with the minijet picture discussed here.

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Section: Minijets and P T Angular Correlationssupporting

confidence: 72%

Section: J Centrality Trends For Other Conventional Modelsmentioning

confidence: 83%

Section: Minijets and Theorymentioning

confidence: 95%

Section: Appendix A: Minijetsmentioning

confidence: 99%

See 2 more Smart Citations

Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions atsNN=62and 200 GeV

Agakishiev¹,

Aggarwal²,

Ahammed³

et al. 2012

Phys. Rev. C

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show abstract

“…This approach complements the approach of studying these phenomena using charge-dependent correlation functions in two dimensions ( η, φ) [18,19]. The balance function can be related to these correlation functions and to other two-particle observables.…”

Section: Balance Function Widthsmentioning

confidence: 91%

Balance functions fromAu+Au,d+Au, andp
Aggarwal¹,
Ahammed²,
Alakhverdyants³
et al. 2010
Phys. Rev. C
54
1
34
0
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Balance functions have been measured for charged-particle pairs, identified charged-pion pairs, and identified charged-kaon pairs in Au + Au, d + Au, and p + p collisions at √ s NN = 200 GeV at the Relativistic Heavy IonCollider using the STAR detector. These balance functions are presented in terms of relative pseudorapidity, η, relative rapidity, y, relative azimuthal angle, φ, and invariant relative momentum, q inv . For charged-particle pairs, the width of the balance function in terms of η scales smoothly with the number of participating nucleons, while HIJING and UrQMD model calculations show no dependence on centrality or system size. For charged-particle and charged-pion pairs, the balance functions widths in terms of η and y are narrower in central Au + Au collisions than in peripheral collisions. The width for central collisions is consistent with thermal blast-wave models where the balancing charges are highly correlated in coordinate space at breakup. This strong correlation might be explained by either delayed hadronization or limited diffusion during the reaction. Furthermore, the narrowing trend is consistent with the lower kinetic temperatures inherent to more central collisions. In contrast, the width of the balance function for charged-kaon pairs in terms of y shows little centrality dependence, which 024905-2 BALANCE FUNCTIONS FROM Au + Au, d + Au, AND . . . 82, 024905 (2010) may signal a different production mechanism for kaons. The widths of the balance functions for charged pions and kaons in terms of q inv narrow in central collisions compared to peripheral collisions, which may be driven by the change in the kinetic temperature. PHYSICAL REVIEW C

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Fluctuations and correlations in STAR

Srivastava

The IVth International Conference on Quarks and Nuclear Physics

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Abstract. The study of correlations and fluctuations can provide evidence for the production of the quarkgluon plasma (QGP) in relativistic heavy ion collisions. Various theories predict that the production of a QGP phase in relativistic heavy ion collisions could produce significant event-by-event correlations and fluctuations in, transverse momentum, multiplicity, etc. Some of the recent results using STAR at RHIC will be presented along with results from other experiments at RHIC. The focus is on forward-backward multiplicity correlations, balance function, charge and transverse momentum fluctuations, and correlations.PACS. 25.75.-q Relativistic heavy-ion collisions, 25.75.Gz Particle correlations

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Transverse-momentump_tcorrelations on (η, phi) from mean-p_tfluctuations in Au–Au collisions at GeV

Cited by 79 publications

References 25 publications

Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions atsNN=62and 200 GeV

Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions atsNN=62and 200 GeV

Balance functions fromAu+Au,d+Au, andp
Aggarwal¹,
Ahammed²,
Alakhverdyants³
et al. 2010
Phys. Rev. C
54
1
34
0
View full text Add to dashboard Cite

Fluctuations and correlations in STAR

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Transverse-momentumptcorrelations on (η, phi) from mean-ptfluctuations in Au–Au collisions at GeV

Cited by 79 publications

References 25 publications

Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions atsNN=62and 200 GeV

Anomalous centrality evolution of two-particle angular correlations from Au-Au collisions atsNN=62and 200 GeV

Balance functions fromAu+Au,d+Au, andpAggarwal1, Ahammed2, Alakhverdyants3 et al. 2010Phys. Rev. C541340View full textAdd to dashboardCite

Fluctuations and correlations in STAR

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Transverse-momentump_tcorrelations on (η, phi) from mean-p_tfluctuations in Au–Au collisions at GeV

Balance functions fromAu+Au,d+Au, andp
Aggarwal¹,
Ahammed²,
Alakhverdyants³
et al. 2010
Phys. Rev. C
54
1
34
0
View full text Add to dashboard Cite