### Abstract

We study solutions to the hydrodynamic equations appropriate for ultrarelativistic nuclear collisions. We find that the matter produced in such collisions spends time t>30 fm/c at temperatures larger than 150 MeV. The transverse momentum of protons, kaons, and pions is computed in the central region of ultrarelativistic nuclear collisions. Assuming Bjorkens initial conditions for the hydrodynamic equations, and a bag-model equation of state, we show that the transverse-momentum distribution as a function of dN/dy does reflect properties of the equation of state. We demonstrate that such a distribution approximately scales as a function of (1/A)dN/dy. The relation between pt and dN/dy is shown to be significantly altered under different assumptions about the equation of state. The transverse-momentum distribution of heavy hadrons is shown to be much enhanced relative to that of light pions. These distributions are little changed by differences in the assumptions about the initial transverse density and velocity profile. We are unable to fit the observed correlation between pt and dE/dy observed in the Japanese-American Cooperative Emulsion Experiment.

Original language | English (US) |
---|---|

Pages (from-to) | 2755-2763 |

Number of pages | 9 |

Journal | Physical Review D |

Volume | 34 |

Issue number | 9 |

DOIs | |

State | Published - 1986 |

Externally published | Yes |

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### ASJC Scopus subject areas

- Physics and Astronomy (miscellaneous)

### Cite this

*Physical Review D*,

*34*(9), 2755-2763. https://doi.org/10.1103/PhysRevD.34.2755

**Studies of the hydrodynamic evolution of matter produced in fluctuations in p»p collisions and in ultrarelativistic nuclear collisions. II. Transverse-momentum distributions.** / Kataja, M.; Ruuskanen, P. V.; McLerran, L. D.; Von Gersdorff, Henrique.

Research output: Contribution to journal › Article

*Physical Review D*, vol. 34, no. 9, pp. 2755-2763. https://doi.org/10.1103/PhysRevD.34.2755

}

TY - JOUR

T1 - Studies of the hydrodynamic evolution of matter produced in fluctuations in p»p collisions and in ultrarelativistic nuclear collisions. II. Transverse-momentum distributions

AU - Kataja, M.

AU - Ruuskanen, P. V.

AU - McLerran, L. D.

AU - Von Gersdorff, Henrique

PY - 1986

Y1 - 1986

N2 - We study solutions to the hydrodynamic equations appropriate for ultrarelativistic nuclear collisions. We find that the matter produced in such collisions spends time t>30 fm/c at temperatures larger than 150 MeV. The transverse momentum of protons, kaons, and pions is computed in the central region of ultrarelativistic nuclear collisions. Assuming Bjorkens initial conditions for the hydrodynamic equations, and a bag-model equation of state, we show that the transverse-momentum distribution as a function of dN/dy does reflect properties of the equation of state. We demonstrate that such a distribution approximately scales as a function of (1/A)dN/dy. The relation between pt and dN/dy is shown to be significantly altered under different assumptions about the equation of state. The transverse-momentum distribution of heavy hadrons is shown to be much enhanced relative to that of light pions. These distributions are little changed by differences in the assumptions about the initial transverse density and velocity profile. We are unable to fit the observed correlation between pt and dE/dy observed in the Japanese-American Cooperative Emulsion Experiment.

AB - We study solutions to the hydrodynamic equations appropriate for ultrarelativistic nuclear collisions. We find that the matter produced in such collisions spends time t>30 fm/c at temperatures larger than 150 MeV. The transverse momentum of protons, kaons, and pions is computed in the central region of ultrarelativistic nuclear collisions. Assuming Bjorkens initial conditions for the hydrodynamic equations, and a bag-model equation of state, we show that the transverse-momentum distribution as a function of dN/dy does reflect properties of the equation of state. We demonstrate that such a distribution approximately scales as a function of (1/A)dN/dy. The relation between pt and dN/dy is shown to be significantly altered under different assumptions about the equation of state. The transverse-momentum distribution of heavy hadrons is shown to be much enhanced relative to that of light pions. These distributions are little changed by differences in the assumptions about the initial transverse density and velocity profile. We are unable to fit the observed correlation between pt and dE/dy observed in the Japanese-American Cooperative Emulsion Experiment.

UR - http://www.scopus.com/inward/record.url?scp=4244128174&partnerID=8YFLogxK

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U2 - 10.1103/PhysRevD.34.2755

DO - 10.1103/PhysRevD.34.2755

M3 - Article

VL - 34

SP - 2755

EP - 2763

JO - Physical review D: Particles and fields

JF - Physical review D: Particles and fields

SN - 1550-7998

IS - 9

ER -