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9 results on '"Vaurynovich SS"'

1. Event-by-event elliptic flow fluctuations from PHOBOS

Author

Wosiek, B, Alver, B, Back, BB, Baker, MD, Ballintijn, M, Barton, DS, Betts, RR, Bickley, AA, Bindel, R, Busza, W, Carroll, A, Chai, Z, Chetluru, V, Decowski, MP, García, E, Gburek, T, George, N, Gulbrandsen, K, Halliwell, C, Hamblen, J, Harnarine, I, Hauer, M, Henderson, C, Hofman, DJ, Hollis, RS, Hołyński, R, Holzman, B, Iordanova, A, Johnson, E, Kane, JL, Khan, N, Kulinich, P, Kuo, CM, Li, W, Lin, WT, Loizides, C, Manly, S, Mignerey, AC, Nouicer, R, Olszewski, A, Pak, R, Reed, C, Richardson, E, Roland, C, Roland, G, Sagerer, J, Seals, H, Sedykh, I, Smith, CE, Stankiewicz, MA, Steinberg, P, Stephans, GSF, Sukhanov, A, Szostak, A, Tonjes, MB, Trzupek, A, Vale, C, van Nieuwenhuizen, GJ, Vaurynovich, SS, Verdier, R, Veres, GI, Walters, P, Wenger, E, Willhelm, D, Wolfs, FLH, Woźniak, K, Wyngaardt, S, and Wysłouch, B

Subjects
Nuclear & Particles Physics, Mathematical Sciences, Physical Sciences
Abstract

Recently PHOBOS has focused on the study of fluctuations and correlations in particle production in heavy-ion collisions at the highest energies delivered by the Relativistic Heavy Ion Collider (RHIC). In this report, we present results on event-by-event elliptic flow fluctuations in Au + Au collisions at √sNN =200 GeV. A data-driven method was used to estimate the dominant contribution from non-flow correlations. Over the broad range of collision centralities, the observed large elliptic flow fluctuations are in agreement with the fluctuations in the initial source eccentricity.

Published
2009

2. Event-by-event fluctuations of azimuthal particle anisotropy in Au+Au collisions at square root(sNN) = 200 GeV.

Author

Alver B, Back BB, Baker MD, Ballintijn M, Barton DS, Betts RR, Bickley AA, Bindel R, Busza W, Carroll A, Chai Z, Decowski MP, García E, Gburek T, George N, Gulbrandsen K, Halliwell C, Hamblen J, Hauer M, Henderson C, Hofman DJ, Hollis RS, Hołyński R, Holzman B, Iordanova A, Johnson E, Kane JL, Khan N, Kulinich P, Kuo CM, Li W, Lin WT, Loizides C, Manly S, Mignerey AC, Nouicer R, Olszewski A, Pak R, Reed C, Roland C, Roland G, Sagerer J, Seals H, Sedykh I, Smith CE, Stankiewicz MA, Steinberg P, Stephans GS, Sukhanov A, Tonjes MB, Trzupek A, Vale C, van Nieuwenhuizen GJ, Vaurynovich SS, Verdier R, Veres GI, Walters P, Wenger E, Wolfs FL, Wosiek B, Woźniak K, and Wysłouch B

Abstract

This Letter presents the first measurement of event-by-event fluctuations of the elliptic flow parameter v(2) in Au+Au collisions at square root(s(NN))=200 GeV as a function of collision centrality. The relative nonstatistical fluctuations of the v(2) parameter are found to be approximately 40%. The results, including contributions from event-by-event elliptic flow fluctuations and from azimuthal correlations that are unrelated to the reaction plane (nonflow correlations), establish an upper limit on the magnitude of underlying elliptic flow fluctuations. This limit is consistent with predictions based on spatial fluctuations of the participating nucleons in the initial nuclear overlap region. These results provide important constraints on models of the initial state and hydrodynamic evolution of relativistic heavy ion collisions.

Published
2010
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3. High transverse momentum triggered correlations over a large pseudorapidity acceptance in Au + Au collisions at square root(s(NN)) = 200 GeV.

Author

Alver B, Back BB, Baker MD, Ballintijn M, Barton DS, Betts RR, Bickley AA, Bindel R, Busza W, Carroll A, Chai Z, Chetluru V, Decowski MP, García E, Gburek T, George N, Gulbrandsen K, Halliwell C, Hamblen J, Hauer M, Henderson C, Hofman DJ, Hollis RS, Hołyński R, Holzman B, Iordanova A, Johnson E, Kane JL, Khan N, Kulinich P, Kuo CM, Li W, Lin WT, Loizides C, Manly S, Mignerey AC, Nouicer R, Olszewski A, Pak R, Reed C, Roland C, Roland G, Sagerer J, Seals H, Sedykh I, Smith CE, Stankiewicz MA, Steinberg P, Stephans GS, Sukhanov A, Tonjes MB, Trzupek A, Vale C, van Nieuwenhuizen GJ, Vaurynovich SS, Verdier R, Veres GI, Walters P, Wenger E, Wolfs FL, Wosiek B, Woźniak K, and Wysłouch B

Abstract

A measurement of two-particle correlations with a high transverse momentum trigger particle (p(T)(trig) > 2.5 GeV/c) is presented for Au+Au collisions at square root(s(NN)) = 200 GeV over the uniquely broad longitudinal acceptance of the PHOBOS detector (-4 < Delta eta < 2). A broadening of the away-side azimuthal correlation compared to elementary collisions is observed at all Delta eta. As in p+p collisions, the near side is characterized by a peak of correlated partners at small angle relative to the trigger particle. However, in central Au+Au collisions an additional correlation extended in Delta eta and known as the "ridge" is found to reach at least |Delta eta| approximately = 4. The ridge yield is largely independent of Delta eta over the measured range, and it decreases towards more peripheral collisions. For the chosen (p(T)(trig) cut, the ridge yield is consistent with zero for events with less than roughly 100 participating nucleons.

Published
2010
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4. System size, energy, and centrality dependence of pseudorapidity distributions of charged particles in relativistic heavy-ion collisions.

Author

Alver B, Back BB, Baker MD, Ballintijn M, Barton DS, Betts RR, Bindel R, Busza W, Chai Z, Chetluru V, García E, Gburek T, Gulbrandsen K, Hamblen J, Harnarine I, Henderson C, Hofman DJ, Hollis RS, Hołyński R, Holzman B, Iordanova A, Kane JL, Kulinich P, Kuo CM, Li W, Lin WT, Loizides C, Manly S, Mignerey AC, Nouicer R, Olszewski A, Pak R, Reed C, Richardson E, Roland C, Roland G, Sagerer J, Sedykh I, Smith CE, Stankiewicz MA, Steinberg P, Stephans GS, Sukhanov A, Szostak A, Tonjes MB, Trzupek A, van Nieuwenhuizen GJ, Vaurynovich SS, Verdier R, Veres GI, Walters P, Wenger E, Willhelm D, Wolfs FL, Wosiek B, Woźniak K, Wyngaardt S, and Wysłouch B

Abstract

We present the first measurements of the pseudorapidity distribution of primary charged particles in Cu+Cu collisions as a function of collision centrality and energy, sqrt[s&#95;{NN}]=22.4, 62.4, and 200 GeV, over a wide range of pseudorapidity, using the PHOBOS detector. A comparison of Cu+Cu and Au+Au results shows that the total number of produced charged particles and the rough shape (height and width) of the pseudorapidity distributions are determined by the number of nucleon participants. More detailed studies reveal that a more precise matching of the shape of the Cu+Cu and Au+Au pseudorapidity distributions over the full range of pseudorapidity occurs for the same N{part}/2A rather than the same N&#95;{part}. In other words, it is the collision geometry rather than just the number of nucleon participants that drives the detailed shape of the pseudorapidity distribution and its centrality dependence at RHIC energies.

Published
2009
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5. System size, energy, pseudorapidity, and centrality dependence of elliptic flow.

Author

Alver B, Back BB, Baker MD, Ballintijn M, Barton DS, Betts RR, Bickley AA, Bindel R, Busza W, Carroll A, Chai Z, Chetluru V, Decowski MP, García E, Gburek T, George N, Gulbrandsen K, Halliwell C, Hamblen J, Harnarine I, Hauer M, Henderson C, Hofman DJ, Hollis RS, Hołyński R, Holzman B, Iordanova A, Johnson E, Kane JL, Khan N, Kulinich P, Kuo CM, Li W, Lin WT, Loizides C, Manly S, Mignerey AC, Nouicer R, Olszewski A, Pak R, Reed C, Richardson E, Roland C, Roland G, Sagerer J, Seals H, Sedykh I, Smith CE, Stankiewicz MA, Steinberg P, Stephans GS, Sukhanov A, Szostak A, Tonjes MB, Trzupek A, Vale C, van Nieuwenhuizen GJ, Vaurynovich SS, Verdier R, Veres GI, Walters P, Wenger E, Willhelm D, Wolfs FL, Wosiek B, Woźniak K, Wyngaardt S, and Wysłouch B

Abstract

This Letter presents measurements of the elliptic flow of charged particles as a function of pseudorapidity and centrality from Cu-Cu collisions at 62.4 and 200 GeV using the PHOBOS detector at the Relativistic Heavy Ion Collider. The elliptic flow in Cu-Cu collisions is found to be significant even for the most central events. For comparison with the Au-Au results, it is found that the detailed way in which the collision geometry (eccentricity) is estimated is of critical importance when scaling out system-size effects. A new form of eccentricity, called the participant eccentricity, is introduced which yields a scaled elliptic flow in the Cu-Cu system that has the same relative magnitude and qualitative features as that in the Au-Au system.

Published
2007
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6. Energy dependence of directed flow over a wide range of pseudorapidity in Au + Au collisions at the BNL Relativistic Heavy Ion Collider.

Author

Back BB, Baker MD, Ballintijn M, Barton DS, Betts RR, Bickley AA, Bindel R, Budzanowski A, Busza W, Carroll A, Chai Z, Decowski MP, García E, Gburek T, George N, Gulbrandsen K, Gushue S, Halliwell C, Hamblen J, Hauer M, Heintzelman GA, Henderson C, Hofman DJ, Hollis RS, Hołyński R, Holzman B, Iordanova A, Johnson E, Kane JL, Katzy J, Khan N, Kucewicz W, Kulinich P, Kuo CM, Lin WT, Manly S, McLeod D, Mignerey AC, Nouicer R, Olszewski A, Pak R, Park IC, Pernegger H, Reed C, Remsberg LP, Reuter M, Roland C, Roland G, Rosenberg L, Sagerer J, Sarin P, Sawicki P, Seals H, Sedykh I, Skulski W, Smith CE, Stankiewicz MA, Steinberg P, Stephans GS, Sukhanov A, Tang JL, Tonjes MB, Trzupek A, Vale C, van Nieuwenhuizen GJ, Vaurynovich SS, Verdier R, Veres GI, Wenger E, Wolfs FL, Wosiek B, Woźniak K, Wuosmaa AH, and Wysłouch B

Abstract

We report on measurements of directed flow as a function of pseudorapidity in Au + Au collisions at energies of square root of SNN = 19.6, 62.4, 130 and 200 GeV as measured by the PHOBOS detector at the BNL Relativistic Heavy Ion Collider. These results are particularly valuable because of the extensive, continuous pseudorapidity coverage of the PHOBOS detector. There is no significant indication of structure near midrapidity and the data surprisingly exhibit extended longitudinal scaling similar to that seen for elliptic flow and charged particle pseudorapidity density.

Published
2006
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7. System size and centrality dependence of charged hadron transverse momentum spectra in Au + Au and Cu + Cu collisions at square root of SNN = 62.4 and 200 GeV.

Author

Alver B, Back BB, Baker MD, Ballintijn M, Barton DS, Betts RR, Bindel R, Busza W, Chai Z, Chetluru V, García E, Gburek T, Gulbrandsen K, Hamblen J, Harnarine I, Henderson C, Hofman DJ, Hollis RS, Hołyński R, Holzman B, Iordanova A, Kane JL, Kulinich P, Kuo CM, Li W, Lin WT, Loizides C, Manly S, Mignerey AC, Nouicer R, Olszewski A, Pak R, Reed C, Richardson E, Roland C, Roland G, Sagerer J, Sedykh I, Smith CE, Stankiewicz MA, Steinberg P, Stephans GS, Sukhanov A, Szostak A, Tonjes MB, Trzupek A, van Nieuwenhuizen GJ, Vaurynovich SS, Verdier R, Veres GI, Walters P, Wenger E, Willhelm D, Wolfs FL, Wosiek B, Woźniak K, Wyngaardt S, and Wysłouch B

Abstract

We present transverse momentum distributions of charged hadrons produced in Cu + Cu collisions at square root of SNN = 62.4 and 200 GeV. The spectra are measured for transverse momenta of 0.25 < pT < 5.0 GeV/c at square root of SNN = 62.4 GeV and 0.25 < pT < 7.0 GeV/c at square root of SNN = 200 GeV, in a pseudorapidity range of 0.2 < eta < 1.4. The nuclear modification factor R(AA) is calculated relative to p + p data at both collision energies as a function of collision centrality. At a given collision energy and fractional cross section, R(AA) is observed to be systematically larger in Cu + Cu collisions compared to Au + Au. However, for the same number of participating nucleons, R(AA) is essentially the same in both systems over the measured range of pT, in spite of the significantly different geometries of the Cu + Cu and Au + Au systems.

Published
2006
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8. Energy dependence of elliptic flow over a large pseudorapidity range in Au+Au collisions at the BNL relativistic heavy ion collider.

Author

Back BB, Baker MD, Ballintijn M, Barton DS, Betts RR, Bickley AA, Bindel R, Budzanowski A, Busza W, Carroll A, Chai Z, Decowski MP, García E, Gburek T, George N, Gulbrandsen K, Gushue S, Halliwell C, Hamblen J, Hauer M, Heintzelman GA, Henderson C, Hofman DJ, Hollis RS, Hołyński R, Holzman B, Iordanova A, Johnson E, Kane JL, Katzy J, Khan N, Kucewicz W, Kulinich P, Kuo CM, Lin WT, Manly S, McLeod D, Mignerey AC, Nouicer R, Olszewski A, Pak R, Park IC, Pernegger H, Reed C, Remsberg LP, Reuter M, Roland C, Roland G, Rosenberg L, Sagerer J, Sarin P, Sawicki P, Seals H, Sedykh I, Skulski W, Smith CE, Stankiewicz MA, Steinberg P, Stephans GS, Sukhanov A, Tang JL, Tonjes MB, Trzupek A, Vale C, van Nieuwenhuizen GJ, Vaurynovich SS, Verdier R, Veres GI, Wenger E, Wolfs FL, Wosiek B, Woźniak K, Wuosmaa AH, and Wysłouch B

Abstract

This Letter describes the measurement of the energy dependence of elliptic flow for charged particles in Au+Au collisions using the PHOBOS detector at the Relativistic Heavy Ion Collider. Data taken at collision energies of square root of s(NN)=19.6, 62.4, 130, and 200 GeV are shown over a wide range in pseudorapidity. These results, when plotted as a function of eta(')=|eta|-y(beam), scale with approximate linearity throughout eta('), implying no sharp changes in the dynamics of particle production as a function of pseudorapidity or increasing beam energy.

Published
2005
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9. Centrality dependence of charged hadron transverse momentum spectra in Au+Au collisions from sqrt[s(NN)]=62.4 to 200 GeV.

Author

Back BB, Baker MD, Ballintijn M, Barton DS, Betts RR, Bickley AA, Bindel R, Busza W, Carroll A, Chai Z, Decowski MP, García E, Gburek T, George N, Gulbrandsen K, Halliwell C, Hamblen J, Hauer M, Henderson C, Hofman DJ, Hollis RS, Hołyński R, Holzman B, Iordanova A, Johnson E, Kane JL, Khan N, Kulinich P, Kuo CM, Lin WT, Manly S, Mignerey AC, Nouicer R, Olszewski A, Pak R, Reed C, Roland C, Roland G, Sagerer J, Seals H, Sedykh I, Smith CE, Stankiewicz MA, Steinberg P, Stephans GS, Sukhanov A, Tonjes MB, Trzupek A, Vale C, van Nieuwenhuizen GJ, Vaurynovich SS, Verdier R, Veres GI, Wenger E, Wolfs FL, Wosiek B, Woźniak K, and Wysłouch B

Abstract

We have measured transverse momentum distributions of charged hadrons produced in Au+Au collisions at sqrt[s(NN)]=62.4 GeV. The spectra are presented for transverse momenta 0.25

Published
2005
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