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. 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 journalArticle

    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.

    Original languageEnglish (US)
    Pages (from-to)22-27
    Number of pages6
    JournalPhysics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics
    Volume684
    Issue number1
    DOIs
    StatePublished - Feb 1 2010

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    pions
    collisions
    protons
    transverse momentum
    energy

    Keywords

    • Forward rapidity
    • Hadronization
    • Heavy ion collision
    • Particle ratios

    ASJC Scopus subject areas

    • Nuclear and High Energy Physics

    Cite this

    Rapidity dependence of the proton-to-pion ratio in Au + Au and p + p collisions at sqrt(sN N) = 62.4 and 200 GeV. / 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.; Katryńska, N.; Kim, E. J.; Larsen, T. M.; Lee, J. H.; Løvhøiden, G.; Majka, Z.; Marcinek, A.; Murray, M. J.; Natowitz, J.; Nielsen, B. S.; Nygaard, C.; Pal, D.; Oviller, A.; Płaneta, R.; Rami, F.; Ristea, C.; Ristea, O.; Röhrich, D.; Sanders, S. J.; Staszel, P.; Tveter, T. S.; Videbæk, F.; Wada, R.; Yang, H.; Yin, Z.; Zgura, I. S.

    In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics, Vol. 684, No. 1, 01.02.2010, p. 22-27.

    Research output: Contribution to journalArticle

    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(sN 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
    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. ; Katryńska, N. ; Kim, E. J. ; Larsen, T. M. ; Lee, J. H. ; Løvhøiden, G. ; Majka, Z. ; Marcinek, A. ; Murray, M. J. ; Natowitz, J. ; Nielsen, B. S. ; Nygaard, C. ; Pal, D. ; Oviller, A. ; Płaneta, R. ; Rami, F. ; Ristea, C. ; Ristea, O. ; Röhrich, D. ; Sanders, S. J. ; Staszel, P. ; Tveter, T. S. ; Videbæk, F. ; Wada, R. ; Yang, H. ; Yin, Z. ; Zgura, I. S. / Rapidity dependence of the proton-to-pion ratio in Au + Au and p + p collisions at sqrt(sN N) = 62.4 and 200 GeV. In: Physics Letters, Section B: Nuclear, Elementary Particle and High-Energy Physics. 2010 ; Vol. 684, No. 1. pp. 22-27.
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    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.

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    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.

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    KW - Forward rapidity

    KW - Hadronization

    KW - Heavy ion collision

    KW - Particle ratios

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

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