Azimuthal Anisotropy and Correlations in the Hard Scattering Regime at RHIC

Adler, C.; Ahammed, Z.; Allgower, C.; Amonett, J.; Anderson, B. D.; Anderson, M.; Averichev, G. S.; Balewski, J.; Barannikova, O.; Barnby, L. S.; Baudot, J.; Bekele, S.; Belaga, V. V.; Bellwied, R.; Berger, J.; Bichsel, H.; Billmeier, A.; Bland, L. C.; Blyth, C. O.; Bonner, B. E.; Boucham, A.; Brandin, A. V.; Bravar, A.; Cadman, R. V.; Caines, H.; Sánchez, M. Calderón De La Barca; Cardenas, A.; Carroll, J.; Castillo, J.; Castro, M.; Cebra, D.; Chaloupka, P.; Chattopadhyay, Subhasis; Chen, Y.; Chernenko, S.; Cherney, M.; Chikanian, A.; Choi, Bong‐Hyuk; Christie, W.; Coffin, J. P.; Cormier, T. M.; Cramer, J. G.; Crawford, H. J.; Deng, Wei-Tian; Derevschikov, A. A.; Didenko, L.; Dietel, T.; Draper, J. E.; Dunin, V. B.; Dunlop, J. C.; Eckardt, V.; Efimov, L. G.; Емелянов, В.; Engelage, J.; Eppley, G.; Erazmus, B.; Fachini, P.; Faine, V.; Faivre, J.; Filimonov, K.; Finch, E.; Fisyak, Y.; Flierl, D.; Foley, K. J.; Fu, J.; Gagliardi, C. A.; Gagunashvili, N.; Gans, J.; Gaudichet, L.; Germain, M.; Geurts, F. J. M.; Ghazikhanian, V.; Grachov, O.; Grigoriev, V.; Guedon, M.; Gushin, E.; Hallman, T. J.; Hardtke, D.; Harris, J. W.; Henry, T. W.; Heppelmann, S.; Herston, T.; Hippolyte, B.; Hirsch, A.; Hjort, E.; Hoffmann, G. W.; Horsley, M.; Huang, H. Z.; Humanic, T. J.; Igo, G.; Ishihara, A.; Ivanshin, Yu.; Jacobs, P.; Jacobs, W. W.; Janik, M. A.; Johnson, I.; Jones, P. G.; Judd, E. G.; Kaneta, M.; Kaplan, M.; Keane, D.; Kiryluk, J.; Kisiel, A.; Klay, J. L.; Klein, S. R.; Klyachko, A.; Константинов, А. С.; Kopytine, M.; Kotchenda, L.; Kovalenko, A. D.; Krämer, M.; Кравцов, П.; Krueger, K.; Kuhn, C.; Куликов, А. И.; Kunde, G. J.; Kunz, C. L.; Kutuev, R.Kh.; Кузнецов, А. А.; Lakéhal-Ayat, L.; Lamont, M. A.C.; Landgraf, J. M.; Lange, S.; Lansdell, C. P.; Lasiuk, B.; Laue, F.; Lauret, J.; Lebedev, A.; Lednický, R.; Leontiev, V. M.; LeVine, M. J.; Li, Q.; Lindenbaum, S. J.; Lisa, M. A.; Liu, F.; Liu, L.; Liu, Z.; Liu, Q. J.; Ljubičić, T.; Llope, W. J.; LoCurto, G.; Long, H.; Longacre, R. S.; Lopez-Noriega, M.; Love, W. A.; Ludlam, T.; Lynn, D.; Ma, Jin; Majka, R.; Margetis, S.; Markert, C.; Martin, L.; Marx, J. N.; Matis, H. S.; Matulenko, Yu. A.; McShane, T. S.; Meißner, F.; Melnick, Yu; Meschanin, A.; Messer, M.; Miller, Michael L.; Milosevich, Z.; Minaev, N. G.; Mitchell, J. T.; Moiseenko, V. A.; Moore, C. F.; Morozov, V.; Moura, M. M. de; Munhoz, M. G.; Nelson, J. M.; Nevski, P.; Никитин, В. А.; Nogach, L. V.; Norman, B.; Nurushev, S. B.; Odyniec, G.; Ogawa, A.; Okorokov, V.; Oldenburg, M.; Olson, D.; Paić, G.; Pandey, S. U.; Panebratsev, Y.; Panitkin, S.; Pavlinov, A. I.; Pawlak, T.; Perevoztchikov, V.; Peryt, W.; Petrov, V.; Planinić, M.; Pluta, J.; Porile, N.; Porter, J.; Poskanzer, A. M.; Potrebenikova, E.; Prindle, D.; Pruneau, C.; Putschke, J.; Rai, G.; Rakness, G.; Ravel, O.; Ray, R. L.; Razin, S. V.; Reichhold, D.; Reid, J. G.; Renault, G.; Retière, F.; Ridiger, A.; Ritter, H. G.; Roberts, J.; Rogachevski, O. V.; Romero, J. L.; Rose, A.; Roy, C.; Rykov, V. L.; Sakrejda, I.; Salur, S.; Sandweiss, J.; Saulys, A. C.; Savin, I.; Schambach, J.; Scharenberg, R. P.; Schmitz, N.; Schroeder, L. S.; Schüttauf, A.; Schweda, K.; Seger, J.; Seliverstov, D. M.; Seyboth, P.; Shahaliev, E.; Shestermanov, K. E.; Shimanskii, S. S.; Shvetcov, V. S.; Škoro, G.; Smirnov, N.; Snellings, Raimond; Sorensen, P.; Sowiński, J.; Spinka, H.; Srivastava, B.; Stephenson, E. J.; Stock, R.; Stolpovsky, A.; Strikhanov, M.; Stringfellow, B.; Struck, C.; Suaide, Alexandre Alarcon Do Passo; Sugarbaker, E.; Suire, C.; Šumbera, M.; Surrow, B.; Symons, T. J. M.; Toledo, A. Szanto de; Szarwas, P.; Tai, A.; Takahashi, J.; Tang, A. H.; Thomas, J. H.; Thompson, M.; Tikhomirov, V. O.; Tokarev, M.; Tonjes, M. B.; Trainor, T. A.; Trentalange, S.; Tribble, R. E.; Trofimov, V.; Tsai, O. D.; Ullrich, T.; Underwood, D. G.; Buren, G. Van; VanderMolen, A. M.; Vasilevski, I. M.; Vasiliev, A.; Vigdor, S. E.; Voloshin, S. A.; Wang, F.; Ward, H.; Watson, J. W.; Wells, R.; Westfall, G. D.; Whitten, C.; Wieman, H.; Willson, R.; Wissink, S. W.; Witt, R.; Wood, J.; Xu, N.; Xu, Z.; Yakutin, A. E.; Yamamoto, E.; Yang, Jing; Yepes, P.; Yurevich, V. I.; Zanevski, Y. V.; Zborovský, I.; Zhang, H.; Zhang, W. M.; Zoulkarneev, R.; Zubarev, A. N.

doi:10.1103/physrevlett.90.032301

Cited by 275 publications

(238 citation statements)

References 29 publications

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“…A significant suppression of high-p T hadron production relative to a simple binary collision scaling from p + p has been observed at RHIC in central Au + Au collisions [1]. Furthermore, it was found that jetlike correlations opposite to trigger jets are suppressed and that the azimuthal anisotropy in hadron emission persists out to very high p T [2][3][4]. In contrast, no suppression effects were seen in d + Au collisions [5][6][7][8], which has led to the conclusion that the observations made in Au + Au are attributable to the high-density medium produced in such collisions and not to initial-state effects.…”

Section: Introductionmentioning

confidence: 92%

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+p
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
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We report a measurement of high-p T inclusive π 0 , η, and direct photon production in p + p and d + Au collisions at √ s NN = 200 GeV at midrapidity (0 < η < 1). Photons from the decay π 0 → γ γ were detected in the barrel electromagnetic calorimeter of the STAR experiment at the Relativistic Heavy Ion Collider. The η → γ γ decay was also observed and constituted the first η measurement by STAR. The first direct photon cross-section measurement by STAR is also presented; the signal was extracted statistically by subtracting the π 0 , η, and ω(782) decay background from the inclusive photon distribution observed in the calorimeter. The analysis is described in detail, and the results are found to be in good agreement with earlier measurements and with next-to-leading-order perturbative QCD calculations.

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Section: Introductionmentioning

confidence: 92%

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+p
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
39
3
13
0
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“…On the right-hand side of Eq. [2], collision integral in terms of collision rate which change the momentum of HF quark from p to p − k is written as…”

Section: Formalismmentioning

confidence: 99%

“…At low energy, the dominant contribution to the energy loss comes from the collision processes. The inmedium energy loss of HQ is manifested in the large elliptic flow i.e., v 2 and in the suppression of high momentum heavy flavored (HF) hadrons as compared to proton-proton collision [1][2][3][4][5][6][7].Heavy quarks are produced in the initial stages of the collisions during the hard scatterings governed by perturbative quantum chromodynamics (pQCD) mostly through gluon fusion [8]; for next-to-leading order production see Ref. [9,10].…”

mentioning

confidence: 99%

Heavy quark transport in a viscous semi-QGP

Singh

Mishra

2020

Phys. Rev. D

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We study the effect of shear and bulk viscosities on the heavy quark transport coefficient within the matrix model of semi QGP. Dissipative effects are incorporated through the first-order viscous correction in the quark/antiquark and gluon distribution function. It is observed that while the shear viscosity effects reduces the drag of heavy quark the bulk viscosity effects increase the drag and the diffusion coefficients of heavy quark. For finite values of η/s and ξ/s, Polyakov loop further decreases the drag and the diffusion coefficients as compared to perturbative QCD. I. INTRODUCTIONThe aim of heavy ion collision (HIC) experiments is to characterize the properties of the deconfined state of matter namely the quark-gluon plasma (QGP) which is being created in these collisions. In this regard, the energy loss of heavy quark (HQ); especially charm and bottom; in the QGP medium is considered as one of the promising probes of QGP. There are two mechanisms that contribute to the energy loss of HQ; one is the radiative energy loss (medium induced gluon radiation) and the other is the collisional energy loss (i.e., scattering of HQ with thermalized medium partons). At low energy, the dominant contribution to the energy loss comes from the collision processes. The inmedium energy loss of HQ is manifested in the large elliptic flow i.e., v 2 and in the suppression of high momentum heavy flavored (HF) hadrons as compared to proton-proton collision [1][2][3][4][5][6][7].Heavy quarks are produced in the initial stages of the collisions during the hard scatterings governed by perturbative quantum chromodynamics (pQCD) mostly through gluon fusion [8]; for next-to-leading order production see Ref. [9,10]. Because of the large mass of HQ as compared to the temperature ranges accessible in the Relativistic Heavy Ion Collider (RHIC) and the Large Hadron Collider (LHC) energies, the thermal production of HQ is negligible. Hence, once produced in the hard collisions, HQ propagates throughout the space-time evolution of the medium and interact with the light thermal partons (light quarks and gluons). Thus, the resulting effect of the interaction of HQ with the bulk medium modifies the spectra of HF hadrons. The interaction of HQ with the bulk medium is described by the scattering of HQ with the light thermal partons of the medium. At low momentum, the dominant contribution to the HQ scattering off of light quark and gluon in the thermal medium comes from the elastic scatterings and can be described by the diffusion process akin to Brownian motion. In addition, the thermalization of HQ in the bulk medium is also slowed down due to its large mass. Hence, the transport of non-equilibrated HQ in the thermalized medium of light quark and gluons yield valuable information about the medium throughout its propagation. In particular, while the low momentum interaction of HQ with the bulk medium is characterized by the spatial diffusion coefficient, the energy loss of HQ is described by the drag coefficient.The electron-positron yield ass...

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“…The enhancement in v 2 in hybrid mode compared to cascade mode can be attributed to the smaller mean free path in the previous case, generating larger pressure gradients due to the assumption of mean-field approximation in the former case. Similar v 2 [52][53][54]. NCQ scaling is a natural outcome of the hadronization models based on coalescence and recombination of partons [55,56] and indicates that the collectivity developed in the early stage of the collisions is of partonic origin.…”

Section: Resultsmentioning

confidence: 89%

Anisotropic flow of charged and identified hadrons at FAIR energies and its dependence on the nuclear equation of state

2019

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In this article, we examine the equation of state (EoS) dependence of the anisotropic flow parameters (v1, v2 and v4) of charged and identified hadrons, as a function of transverse momentum (pT), rapidity (yc.m.) and the incident beam energy (E Lab ) in mid-central Au + Au collisions in the energy range E Lab = 6 − 25 A GeV. Simulations are carried out by employing different variants of the Ultra-relativistic Quantum Molecular Dynamics (UrQMD) model, namely the pure transport (cascade) mode and the hybrid mode. In the hybrid mode, transport calculations are coupled with the ideal hydrodynamical evolution. Within the hydrodynamic scenario, two different equations of state (EoS) viz. Hadron gas and Chiral + deconfinement EoS have been employed separately to possibly mimic the hadronic and partonic scenarios, respectively. It is observed that the flow parameters are sensitive to the onset of hydrodynamic expansion of the fireball in comparison to the pure transport approach. The results would be useful as predictions for the upcoming low energy experiments at Facility for Antiproton and Ion Research (FAIR) and Nuclotron-based Ion Collider fAcility (NICA).

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Azimuthal Anisotropy and Correlations in the Hard Scattering Regime at RHIC

Cited by 275 publications

References 29 publications

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+p
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
39
3
13
0
View full text Add to dashboard Cite

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+p
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
39
3
13
0
View full text Add to dashboard Cite

Heavy quark transport in a viscous semi-QGP

Anisotropic flow of charged and identified hadrons at FAIR energies and its dependence on the nuclear equation of state

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Azimuthal Anisotropy and Correlations in the Hard Scattering Regime at RHIC

Cited by 275 publications

References 29 publications

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+pAbelev1, Aggarwal2, Ahammed3 et al. 2010Phys. Rev. CSelf Cite393130View full textAdd to dashboardCite

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+pAbelev1, Aggarwal2, Ahammed3 et al. 2010Phys. Rev. CSelf Cite393130View full textAdd to dashboardCite

Heavy quark transport in a viscous semi-QGP

Anisotropic flow of charged and identified hadrons at FAIR energies and its dependence on the nuclear equation of state

Contact Info

Product

Resources

About

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+p
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
39
3
13
0
View full text Add to dashboard Cite

Inclusiveπ0,η, and direct photon production at high transverse momentum inp+p
Abelev¹,
Aggarwal²,
Ahammed³
et al. 2010
Phys. Rev. C
Self Cite
39
3
13
0
View full text Add to dashboard Cite