Constraints from hadron spectra on thermal electromagnetic emission in heavy-ion collisions at the CERN SPS
In this thesis the space-time evolution of matter produced in an ultrarelativistic heavy-ion collision is studied using a one-fluid hydrodynamical model. The initial state of the evolution is constrained to reproduce the observed hadron spectra in S+Au and Pb+Pb collisions at the CERN-SPS energy. Simultaneously the photon and electron pair emission are calculated and their dependence on an equation of state (EoS) and initial density distribution are studied. The initial state of a hydrodynamic evolution is difficult to determine. To reduce the arbitrariness of choosing the initial conditions for different collisions, a parametrisation of the initial state based on baryon stopping in terms of the thickness of colliding nuclei was developed. This parametrization is applicable to all nucleus-nucleus collisions measured at the CERN SPS. With only a few parameters the main features of the hadronic spectra can be reproduced in all of them. If the evolution is constrained to reproduce the observed hadronic spectra, the remaining freedom in the equation of state and initial distributions affects different electromagnetic observables in different ways. The photon yield depends clearly on the phase transition temperature but is sensitive to the maximum temperature only at very high values of pT. Intermediate mass lepton pairs reflect the maximum value of temperature during the evolution and are therefore much more sensitive to the initial distributions than to the EoS. On the other hand the mass spectrum of low mass electron pairs is almost insensitive to both EoS and initial state but the shape of electron pair rapidity spectrum depends strongly on the flow and therefore on the EoS.
...
![showless](/themes/JYX2//images/showless.png)
![showmore](/themes/JYX2//images/showmore.png)
ISBN
978-951-39-9494-5Julkaisuun sisältyy osajulkaisuja
- Artikkeli I: Sollfrank, J., Huovinen, P., Kataja, M., Ruuskanen, P. V., Prakash, M., and Venugopalan, R. (1997). Hydrodynamical description of 200A GeV/c S+Au collisions: Hadron and electromagnetic spectra. Physical Review C, 55, 392. DOI: 10.1103/PhysRevC.55.392
- Artikkeli II: Sollfrank, J., Huovinen, P. & Ruuskanen, P. V. (1997). Initial conditions in the one-fluid hydrodynamical description of ultra-relativistic nuclear collisions. Acta Physica Hungarica New Series Heavy Ion Physics, 5, 321–332. DOI: 10.1007/BF03156108
- Artikkeli III: Sollfrank, J., Huovinen, P. & Ruuskanen, P. V. (1999). Mass number scaling in ultra-relativistic nuclear collisions from a hydrodynamical approach. The European Physical Journal C - Particles and Fields, 6, 525–536. DOI: 10.1007/s100529800934
- Artikkeli IV: Huovinen, P., Ruuskanen, P. V., Sollfrank, J. (1999). Sensitivity of electromagnetic spectra to equation of state and initial energy density in the Pb + Pb collisions at SPS. Nuclear Physics A, 650(2), 227-244. DOI: 10.1016/S0375-9474(99)00107-4
Metadata
Näytä kaikki kuvailutiedotKokoelmat
- Väitöskirjat [3515]
Lisenssi
Samankaltainen aineisto
Näytetään aineistoja, joilla on samankaltainen nimeke tai asiasanat.
-
Hydrodynamical analysis of hadron spectra and thermal photon emission in ultrarelativistic heavy ion collisions
Räsänen, Sami (University of Jyväskylä, 2005) -
Constraints on jet quenching in p–Pb collisions at √sNN = 5.02 TeV measured by the event-activity dependence of semi-inclusive hadron-jet distributions
ALICE Collaboration (Elsevier B.V., 2018)The ALICE Collaboration reports the measurement of semi-inclusive distributions of charged-particle jets recoiling from a high-transverse momentum trigger hadron in p–Pb collisions at √sNN = 5.02 TeV. Jets are reconstructed ... -
Identified charged-hadron production in p + Al, 3 He +Au, and Cu + Au collisions at √sNN = 200 GeV and in U + U collisions at √sNN = 193 GeV
PHENIX Collaboration (American Physical Society (APS), 2024)The PHENIX experiment has performed a systematic study of identified charged-hadron (π±, K±, p, ¯p) production at midrapidity in p + Al, 3 He +Au, and Cu + Au collisions at √sNN = 200 GeV and U + U collisions at √sNN = 193 ... -
Transverse momentum spectra and nuclear modification factors of charged particles in pp, p-Pb and Pb-Pb collisions at the LHC
ALICE Collaboration (Springer, 2018)We report the measured transverse momentum (pT) spectra of primary charged particles from pp, p-Pb and Pb-Pb collisions at a center-of-mass energy √sNN=5.02 TeV in the kinematic range of 0.15 < pT< 50 GeV/c and |η| < 0.8. ... -
Hydrodynamical flow and hadron spectra in ultrarelativistic heavy ion collisions at RHIC and the LHC
Niemi, Harri (University of Jyväskylä, 2008)
Ellei toisin mainittu, julkisesti saatavilla olevia JYX-metatietoja (poislukien tiivistelmät) saa vapaasti uudelleenkäyttää CC0-lisenssillä.