Single particle spectra from NA44

Bøggild, H.; Boissevain, J.; Cherney, M.; Dodd, J.; Downing, J. R.; Fabjan, C. W.; Fields, D. E.; Franz, A.; Hansen, Klavs; Humanic, T. J.; Ikemoto, T.; Jacak, B.; Jayanti, R.; Kalechofsky, H.; Kobayashi, Toshio; Kvatadze, R.; Lee, Y.Y.; Leltchouk, M.; Lörstad, B.; Maeda, N.; Medvedev, A. B.; Miake, Y.; Miyabayashi, A.; Murray, M.; Nagamiya, S.; Nishimura, S.; Noteboon, E.; Pandey, S.U.; Piuz, F.; Polychronakos, V.; Poulard, G.; Rieubland, J. M.; Sakaguchi, A.; Sarabura, A M.; Shigaki, K.; Simon‐Gillo, J.; Sondheim, W. E.; Sugitate, T.; Sullivan, J.P.; Sumi, Y.; Sletten, H.; Hecke, H. Van; Willis, W.; Wolf, K.

doi:10.1016/0375-9474(94)90682-3

Cited by 22 publications

(48 citation statements)

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“…The solid curve is the charged particle distribution, eq.(18). : Comparison of our result for the yield ratio π − /π + (solid line) with NA44 Collab's data [12]. Remark that we did not fit the data, but the normalization of the curve has been done by estimating the overall ratio through data.…”

Section: Concluding Remarks and Discussionmentioning

confidence: 89%

“…In addition to this, fields by both the incident nuclei and by the penetrating systems consisting of spectator nucleons are also taken into account 1 . The determination of the freeze-out hypersurface and computation of the transverse-momentum distribution is given in Section V. The results obtained are compared with the experimental data for the pionic yield ratio π − /π + by NA44 Collaboration [12]. Finally, we close our discussions with some concluding remarks and prediction for the pion yield ratio for Au+Au collisions at 100+100 GeV/nucleon.…”

Section: Introductionmentioning

confidence: 90%

“…In the previous subsection, we have estimated the net charge distribution by using the NA49 data on 158 GeV/nucleon Pb+Pb collision with the centrality 5 % [15]. We would like to study the Coulomb effect on the π + /π − ratio, which has been measured by the NA44 Collaboration [12], considering events with 15 % centrality. The question is that there are no corresponding data which would allow us to estimate the net charge distribution under the same experimental conditions.…”

Section: Centrality Dependence Of the Net Charge Distributionmentioning

confidence: 99%

“…To compare more precisely our results with the NA44 data [12] for centrality 15% , we introduce the acceptance correction factor A(m T , y) to our formula eq. (51), which would approximately reproduce the nature of the NA44's detectors:…”

Section: A Transverse-momentum Spectra Of Charged Particlesmentioning

confidence: 99%

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Coulomb effect: A possible probe for the evolution of hadronic matter

Osada

Hama

1999

Phys. Rev. C

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An electromagnetic field produced in high-energy heavy-ion collisions contains much useful information, because the field can be directly related to the motion of the matter in the whole stage of the reaction. One can divide the total electromagnetic field into three parts, i.e., the contributions from the incident nuclei, nonparticipating nucleons, and charged fluid, the latter consisting of strongly interacting hadrons or quarks. Parametrizing the space-time evolution of the charged fluid based on hydrodynamic model, we study the development of the electromagnetic field which accompanies the high-energy heavy-ion collisions. We found that the incident nuclei bring a rather strong electromagnetic field to the interaction region of hadrons or quarks over a few fm after the collision. On the other hand, the observed charged hadrons' spectra are mostly affected ͑Coulomb effect͒ by the field of the charged fluid. We compare the result of our model with experimental data and found that the model reproduces them well. The pion yield ratio Ϫ / ϩ at a RHIC energy, AuϩAu 100ϩ100 GeV/nucleon, is also predicted. ͓S0556-2813͑99͒00609-3͔PACS number͑s͒: 25.75.Ϫq II. GLAUBER MODEL A. Participant and penetrating nucleons in A-B collisionsThe participant nucleon number in a nucleus-nucleus collision can be estimated by using the Glauber model ͓13͔. To *Electronic address: osada@fma.if.usp.br † Electronic address: hama@fma.if.usp.br 1 In a previous work by Barz et al. ͓9͔, the role of the incident nuclei and penetrating systems is not clear. PHYSICAL REVIEW C, VOLUME 60, 034904 0556-2813/99/60͑3͒/034904͑13͒/$15.00

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Section: Concluding Remarks and Discussionmentioning

confidence: 89%

Section: Introductionmentioning

confidence: 90%

Section: Centrality Dependence Of the Net Charge Distributionmentioning

confidence: 99%

Section: A Transverse-momentum Spectra Of Charged Particlesmentioning

confidence: 99%

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Coulomb effect: A possible probe for the evolution of hadronic matter

Osada

Hama

1999

Phys. Rev. C

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“…Hence the total number of trajectories computed was 3 × 10 6 for each set of initial conditions. For central Pb+Pb collisions at 158 A GeV at the SPS, for which NA44 and NA49 have reported a significant amount of stopping [5,6], the number of protons per unit rapidity in the central region is on the order of 30. If we consider that the rapidity region spanned by the fireball is between 1 and 5 units, then we take as the effective fireball's charge Z = 120.…”

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confidence: 99%

Size of fireballs created in high energy heavy ion collisions as inferred from Coulomb distortions of pion spectra

1999

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We compute the Coulomb effects produced by an expanding, highly charged fireball on the momentum distribution of pions. We compare our results to data on Au+Au at 11.6 A GeV from E866 at the BNL AGS and to data on Pb+Pb at 158 A GeV from NA44 at the CERN SPS. We conclude that the distortion of the spectra at low transverse momentum and mid-rapidity can be explained in both experiments by the effect of the large amount of participating charge in the central rapidity region. By adjusting the fireball expansion velocity to match the average transverse momentum of protons, we find a best fit when the fireball radius is about 10 fm, as determined by the moment when the pions undergo their last scattering. This value is common to both the AGS and CERN experiments.

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