Rapidity dependence of the proton-to-pion ratio in Au + Au and p + p collisions at sqrt(sN N) = 62.4 and 200 GeV

I. G. Arsene; I. G. Bearden; D. Beavis; S. Bekele; C. Besliu; B. Budick; H. Bøggild; C. Chasman; C. H. Christensen; P. Christiansen; H. H. Dalsgaard; R. Debbe; J. J. Gaardhøje; K. Hagel; H. Ito; A. Jipa; E. B. Johnson; C. E. Jørgensen; R. Karabowicz; N. Katryńska; E. J. Kim; T. M. Larsen; J. H. Lee; G. Løvhøiden; Z. Majka; A. Marcinek; M. J. Murray; J. Natowitz; B. S. Nielsen; C. Nygaard; D. Pal; A. Oviller; R. Płaneta; F. Rami; C. Ristea; O. Ristea; D. Röhrich; S. J. Sanders; P. Staszel; T. S. Tveter; F. Videbæk; R. Wada; H. Yang; Z. Yin; I. S. Zgura

doi:10.1016/j.physletb.2009.12.055

Rapidity dependence of the proton-to-pion ratio in Au + Au and p + p collisions at sqrt(s_{N N}) = 62.4 and 200 GeV

I. G. Arsene, I. G. Bearden, D. Beavis, S. Bekele, C. Besliu, B. Budick, H. Bøggild, C. Chasman, C. H. Christensen, P. Christiansen, H. H. Dalsgaard, R. Debbe, J. J. Gaardhøje, K. Hagel, H. Ito, A. Jipa, E. B. Johnson, C. E. Jørgensen, R. Karabowicz, N. KatryńskaE. J. Kim, T. M. Larsen, J. H. Lee, G. Løvhøiden, Z. Majka, A. Marcinek, M. J. Murray, J. Natowitz, B. S. Nielsen, C. Nygaard, D. Pal, A. Oviller, R. Płaneta, F. Rami, C. Ristea, O. Ristea, D. Röhrich, S. J. Sanders, P. Staszel, T. S. Tveter, F. Videbæk, R. Wada, H. Yang, Z. Yin, I. S. Zgura

Research output: Contribution to journal › Article › peer-review

Abstract

The proton-to-pion ratios measured in the BRAHMS experiment for Au + Au and p + p collisions at sqrt(s_{N N}) = 62.4 and 200 GeV are presented as a function of transverse momentum and collision centrality at selected pseudorapidities in the range of 0-3.8. A strong pseudorapidity dependence of these ratios is observed. We also compare the magnitude and p_T-dependence of the p / π⁺ ratios measured in Au + Au collisions at sqrt(s_{N N}) = 200 GeV and η ≈ 2.2 with the same ratio measured at sqrt(s_{N N}) = 62.4 GeV and η = 0. The great similarity found between these ratios throughout the whole p_T range (up to 2.2 GeV / c) is consistent with particle ratios in A + A collisions being described with grand-canonical distributions characterized by the baryo-chemical potential μ_B. At the collision energy of 62.4 GeV, we have observed a unique point in pseudorapidity, η = 3.2, where the p / π⁺ ratio is independent of the collision system size in a wide p_T-range of 0.3 ≤ p_T ≤ 1.8 GeV / c.

Original language	English (US)
Pages (from-to)	22-27
Number of pages	6
Journal	Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
Volume	684
Issue number	1
DOIs	https://doi.org/10.1016/j.physletb.2009.12.055
State	Published - Feb 1 2010

Keywords

Forward rapidity
Hadronization
Heavy ion collision
Particle ratios

ASJC Scopus subject areas

Nuclear and High Energy Physics

Access to Document

10.1016/j.physletb.2009.12.055

Cite this

Arsene, I. G., Bearden, I. G., Beavis, D., Bekele, S., Besliu, C., Budick, B., Bøggild, H., Chasman, C., Christensen, C. H., Christiansen, P., Dalsgaard, H. H., Debbe, R., Gaardhøje, J. J., Hagel, K., Ito, H., Jipa, A., Johnson, E. B., Jørgensen, C. E., Karabowicz, R., ... Zgura, I. S. (2010). Rapidity dependence of the proton-to-pion ratio in Au + Au and p + p collisions at sqrt(s_{N N}) = 62.4 and 200 GeV. Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, 684(1), 22-27. https://doi.org/10.1016/j.physletb.2009.12.055

Arsene, IG, Bearden, IG, Beavis, D, Bekele, S, Besliu, C, Budick, B, Bøggild, H, Chasman, C, Christensen, CH, Christiansen, P, Dalsgaard, HH, Debbe, R, Gaardhøje, JJ, Hagel, K, Ito, H, Jipa, A, Johnson, EB, Jørgensen, CE, Karabowicz, R, Katryńska, N, Kim, EJ, Larsen, TM, Lee, JH, Løvhøiden, G, Majka, Z, Marcinek, A, Murray, MJ, Natowitz, J, Nielsen, BS, Nygaard, C, Pal, D, Oviller, A, Płaneta, R, Rami, F, Ristea, C, Ristea, O, Röhrich, D, Sanders, SJ, Staszel, P, Tveter, TS, Videbæk, F, Wada, R, Yang, H, Yin, Z & Zgura, IS 2010, 'Rapidity dependence of the proton-to-pion ratio in Au + Au and p + p collisions at sqrt(s_{N N}) = 62.4 and 200 GeV', Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, vol. 684, no. 1, pp. 22-27. https://doi.org/10.1016/j.physletb.2009.12.055

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title = "Rapidity dependence of the proton-to-pion ratio in Au + Au and p + p collisions at sqrt(sN N) = 62.4 and 200 GeV",

abstract = "The proton-to-pion ratios measured in the BRAHMS experiment for Au + Au and p + p collisions at sqrt(sN N) = 62.4 and 200 GeV are presented as a function of transverse momentum and collision centrality at selected pseudorapidities in the range of 0-3.8. A strong pseudorapidity dependence of these ratios is observed. We also compare the magnitude and pT-dependence of the p / π+ ratios measured in Au + Au collisions at sqrt(sN N) = 200 GeV and η ≈ 2.2 with the same ratio measured at sqrt(sN N) = 62.4 GeV and η = 0. The great similarity found between these ratios throughout the whole pT range (up to 2.2 GeV / c) is consistent with particle ratios in A + A collisions being described with grand-canonical distributions characterized by the baryo-chemical potential μB. At the collision energy of 62.4 GeV, we have observed a unique point in pseudorapidity, η = 3.2, where the p / π+ ratio is independent of the collision system size in a wide pT-range of 0.3 ≤ pT ≤ 1.8 GeV / c.",

keywords = "Forward rapidity, Hadronization, Heavy ion collision, Particle ratios",

author = "Arsene, {I. G.} and Bearden, {I. G.} and D. Beavis and S. Bekele and C. Besliu and B. Budick and H. B{\o}ggild and C. Chasman and Christensen, {C. H.} and P. Christiansen and Dalsgaard, {H. H.} and R. Debbe and Gaardh{\o}je, {J. J.} and K. Hagel and H. Ito and A. Jipa and Johnson, {E. B.} and J{\o}rgensen, {C. E.} and R. Karabowicz and N. Katry{\'n}ska and Kim, {E. J.} and Larsen, {T. M.} and Lee, {J. H.} and G. L{\o}vh{\o}iden and Z. Majka and A. Marcinek and Murray, {M. J.} and J. Natowitz and Nielsen, {B. S.} and C. Nygaard and D. Pal and A. Oviller and R. P{\l}aneta and F. Rami and C. Ristea and O. Ristea and D. R{\"o}hrich and Sanders, {S. J.} and P. Staszel and Tveter, {T. S.} and F. Videb{\ae}k and R. Wada and H. Yang and Z. Yin and Zgura, {I. S.}",

note = "Funding Information: This work was supported by the Division of Nuclear Physics of the Office of Science of the U.S. Department of Energy under contracts DE-AC02-98-CH10886 , DE-FG03-93-ER40773 , DE-FG03-96-ER40981 , and DE-FG02-99-ER41121 , the Danish Natural Science Research Council , the Research Council of Norway , the Polish Ministry of Science and Higher Education (Contract no. 1248/B/H03/2009/36 ), and the Romanian Ministry of Education and Research (5003/1999, 6077/2000), and a sponsored research grant from Renaissance Technologies Corp. We thank the staff of the Collider-Accelerator Division and the RHIC computing facility at BNL for their support to the experiment.",

year = "2010",

month = feb,

day = "1",

doi = "10.1016/j.physletb.2009.12.055",

language = "English (US)",

volume = "684",

pages = "22--27",

journal = "Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics",

issn = "0370-2693",

publisher = "Elsevier",

number = "1",

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TY - JOUR

T1 - Rapidity dependence of the proton-to-pion ratio in Au + Au and p + p collisions at sqrt(sN N) = 62.4 and 200 GeV

AU - Arsene, I. G.

AU - Bearden, I. G.

AU - Beavis, D.

AU - Bekele, S.

AU - Besliu, C.

AU - Budick, B.

AU - Bøggild, H.

AU - Chasman, C.

AU - Christensen, C. H.

AU - Christiansen, P.

AU - Dalsgaard, H. H.

AU - Debbe, R.

AU - Gaardhøje, J. J.

AU - Hagel, K.

AU - Ito, H.

AU - Jipa, A.

AU - Johnson, E. B.

AU - Jørgensen, C. E.

AU - Karabowicz, R.

AU - Katryńska, N.

AU - Kim, E. J.

AU - Larsen, T. M.

AU - Lee, J. H.

AU - Løvhøiden, G.

AU - Majka, Z.

AU - Marcinek, A.

AU - Murray, M. J.

AU - Natowitz, J.

AU - Nielsen, B. S.

AU - Nygaard, C.

AU - Pal, D.

AU - Oviller, A.

AU - Płaneta, R.

AU - Rami, F.

AU - Ristea, C.

AU - Ristea, O.

AU - Röhrich, D.

AU - Sanders, S. J.

AU - Staszel, P.

AU - Tveter, T. S.

AU - Videbæk, F.

AU - Wada, R.

AU - Yang, H.

AU - Yin, Z.

AU - Zgura, I. S.

N1 - Funding Information: This work was supported by the Division of Nuclear Physics of the Office of Science of the U.S. Department of Energy under contracts DE-AC02-98-CH10886 , DE-FG03-93-ER40773 , DE-FG03-96-ER40981 , and DE-FG02-99-ER41121 , the Danish Natural Science Research Council , the Research Council of Norway , the Polish Ministry of Science and Higher Education (Contract no. 1248/B/H03/2009/36 ), and the Romanian Ministry of Education and Research (5003/1999, 6077/2000), and a sponsored research grant from Renaissance Technologies Corp. We thank the staff of the Collider-Accelerator Division and the RHIC computing facility at BNL for their support to the experiment.

PY - 2010/2/1

Y1 - 2010/2/1

N2 - The proton-to-pion ratios measured in the BRAHMS experiment for Au + Au and p + p collisions at sqrt(sN N) = 62.4 and 200 GeV are presented as a function of transverse momentum and collision centrality at selected pseudorapidities in the range of 0-3.8. A strong pseudorapidity dependence of these ratios is observed. We also compare the magnitude and pT-dependence of the p / π+ ratios measured in Au + Au collisions at sqrt(sN N) = 200 GeV and η ≈ 2.2 with the same ratio measured at sqrt(sN N) = 62.4 GeV and η = 0. The great similarity found between these ratios throughout the whole pT range (up to 2.2 GeV / c) is consistent with particle ratios in A + A collisions being described with grand-canonical distributions characterized by the baryo-chemical potential μB. At the collision energy of 62.4 GeV, we have observed a unique point in pseudorapidity, η = 3.2, where the p / π+ ratio is independent of the collision system size in a wide pT-range of 0.3 ≤ pT ≤ 1.8 GeV / c.

AB - The proton-to-pion ratios measured in the BRAHMS experiment for Au + Au and p + p collisions at sqrt(sN N) = 62.4 and 200 GeV are presented as a function of transverse momentum and collision centrality at selected pseudorapidities in the range of 0-3.8. A strong pseudorapidity dependence of these ratios is observed. We also compare the magnitude and pT-dependence of the p / π+ ratios measured in Au + Au collisions at sqrt(sN N) = 200 GeV and η ≈ 2.2 with the same ratio measured at sqrt(sN N) = 62.4 GeV and η = 0. The great similarity found between these ratios throughout the whole pT range (up to 2.2 GeV / c) is consistent with particle ratios in A + A collisions being described with grand-canonical distributions characterized by the baryo-chemical potential μB. At the collision energy of 62.4 GeV, we have observed a unique point in pseudorapidity, η = 3.2, where the p / π+ ratio is independent of the collision system size in a wide pT-range of 0.3 ≤ pT ≤ 1.8 GeV / c.

KW - Forward rapidity

KW - Hadronization

KW - Heavy ion collision

KW - Particle ratios

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U2 - 10.1016/j.physletb.2009.12.055

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JO - Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics

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