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101. High transverse momentum hadron spectra at sqrt(sNN)=17.3 GeV in Pb+Pb and p+p collisions

Author: Alt, C., Antičić, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J. G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kikola, D, Kliemant, M., Kniege, S., Kolesnikov, V. I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, S., Nikolić, V., Palla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Peryt, W, Pikna, M., Pluta, J., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Šuša, T., Szentpetery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, D., Wetzler, A., Wlodarczyk, Z., Wojtaszek, A., Yoo, I. K., and Zimanyi, J.
Subjects: Physics, Nuclear Experiment, NA49, SPS, Pb+Pb, p+p, high transverse momentum, hadron
Abstract: Transverse momentum spectra up to 4.5 GeV/c around midrapidity of pi+-, p, anti-p, and K+- in Pb+Pb reactions were measured at sqrt(sNN)=17.3 GeV by the CERN-NA49 experiment. The nuclear modification factors RAA for pi+- and RCP for pi+-, p, anti-p, K+- were extracted and compared with results obtained at the BNL Relativistic Heavy Ion Collider (RHIC) at sqrt(sNN)=200 GeV. The modification factor RAA shows a rapid increase with transverse momentum in the covered region. This indicates that the Cronin effect is the dominating effect in our energy range. The modification factor RCP, in which the contribution of the Cronin effect is reduced, shows a saturation well below unity in the pi+- channel. The extracted RCP values follow the 200 GeV RHIC results closely in the available transverse momentum range, except for pi+- above 2.5 GeV/c transverse momentum. There the measured suppression is smaller than that observed at RHIC.
Published: 2008

102. Pion and kaon production in central Pb plus Pb collisions at 20A and 30A GeV: Evidence for the onset of deconfinement

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. and Betev, L. Bialkowska, H. Blume, C. Boimska, B. Botje, M. and Bracinik, J. Bramm, R. Buncic, P. Cerny, V. and Christakoglou, P. Chung, P. Chvala, O. Cramer, J. G. and Csato, P. Dinkelaker, P. Eckardt, V. Flierl, D. Fodor, Z. Foka, P. Friese, V. Gal, J. Gazdzicki, M. G. and Genchev, V. Gladysz, E. Grebieszkow, K. Hegyi, S. and Hoehne, C. Kadija, K. Karev, A. Kikola, D. Kliemant, M. and Kniege, S. Kolesnikov, V. I. Kollegger, T. Kornas, E. and Kowalski, M. Kraus, I. Kreps, M. Laszlo, A. Lacey, R. van Leeuwen, M. Levai, P. Litov, L. Lungwitz, B. and Makariev, M. Malakhov, A. I. Mateev, M. Melkumov, G. L. and Mischke, A. Mitrovski, M. Molnar, J. Mrowczynski, St and Nicolic, V. Palla, G. Panagiotou, A. D. Panayotov, D. and Petridis, A. Peryt, W. Pikna, M. Pluta, J. Prindle, D. and Uhlhofer, F. P. Renfordt, R. Roland, C. Roland, G. and Rybczynski, M. Rybicki, A. Sandoval, A. Schmitz, N. and Schuster, T. Seyboth, P. Sikler, F. Sitar, B. and Skrzypczak, E. Slodkowski, M. Stefanek, G. Stock, R. and Strabel, C. Obele, H. Str Susa, T. Szentpetery, I. and Sziklai, J. Szuba, M. Szymanski, P. Trubnikov, V. Varga, D. Vassiliou, M. Veres, G. I. Vesztergombi, G. Vranic, D. Wetzler, A. Wlodarczyk, Z. Yoo, I. K. Zimanyi, J. and NA49 Collaboration
Subjects: Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Results on charged pion and kaon production in central Pb+Pb collisions at 20A and 30A GeV are presented and compared to data at lower and higher energies. Around 30A GeV a rapid change of the energy dependence for the yields of pions and kaons as well as for the shape of the transverse mass spectra is observed. The change is compatible with the prediction that the threshold for production of a state of deconfined matter at the early stage of the collisions is located at low CERN Super Proton Synchroton energies.
Published: 2008

103. High transverse momentum hadron spectra at root s(NN)=17.3 GeV in Pb+Pb and p+p collisions

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. and Betev, L. Bialkowska, H. Blume, C. Boimska, B. Botje, M. and Bracinik, J. Bramm, R. Buncic, P. Cerny, V. and Christakoglou, P. Chung, P. Chvala, O. Cramer, J. G. and Csato, P. Dinkelaker, P. Eckardt, V. Flierl, D. Fodor, Z. Foka, P. Friese, V. Gal, J. Gazdzicki, M. and Genchev, V. Georgopoulos, G. Gladysz, E. Grebieszkow, K. and Hegyi, S. Hoehne, C. Kadija, K. Karev, A. Kikola, D. and Kliemant, M. Kniege, S. Kolesnikov, V. I. Kornas, E. and Korus, R. Kowalski, M. Kraus, I. Kreps, M. Laszlo, A. and Lacey, R. van Leeuwen, M. Levai, P. Litov, L. and Lungwitz, B. Makariev, M. Malakhov, A. I. Mateev, M. and Melkumov, G. L. Mischke, A. Mitrovski, M. Molnar, J. and Mrowczynski, St. Nicolic, V. Palla, G. Panagiotou, A. D. and Panayotov, D. Petridis, A. Peryt, W. Pikna, M. Pluta, J. and Prindle, D. Puehlhofer, F. Renfordt, R. Roland, C. and Roland, G. Rybczynski, M. Rybicki, A. Sandoval, A. and Schmitz, N. Schuster, T. Seyboth, P. Sikler, F. Sitar, B. Skrzypczak, E. Slodkowski, M. Stefanek, G. Stock, R. and Strabel, C. Stroeble, H. Susa, T. Szentpetery, I. and Sziklai, J. Szuba, M. Szymanski, P. Trubnikov, V. Varga, D. Vassiliou, M. Veres, G. I. Vesztergombi, G. Vranic, D. Wetzler, A. Wlodarczyk, Z. Wojtaszek, A. Yoo, I. K. and Zimanyi, J. NA49 Collaboration
Subjects: High Energy Physics::Experiment, Nuclear Experiment
Abstract: Transverse momentum spectra up to 4.5 GeV/c around midrapidity of pi(+/-), p, (p) over bar, and K-+/- in Pb+Pb reactions were measured at root s(NN) = 17.3 GeV by the CERN-NA49 experiment. The nuclear modification factors R-AA for pi(+/-) and R-CP for pi(+/-), p, (p) over bar, K-+/- were extracted and compared with results obtained at the BNL Relativistic Heavy Ion Collider (RHIC) at root s(NN) = 200 GeV. The modification factor R-AA shows a rapid increase with transverse momentum in the covered region. This indicates that the Cronin effect is the dominating effect in our energy range. The modification factor R-CP, in which the contribution of the Cronin effect is reduced, shows a saturation well below unity in the pi(+/-) channel. The extracted R-CP values follow the 200 GeV RHIC results closely in the available transverse momentum range, except for pi(+/-) above 2.5 GeV/c transverse momentum. There the measured suppression is smaller than that observed at RHIC.
Published: 2008

104. Bose-Einstein correlations of pi(-)pi(-) pairs in central Pb+Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. and Betev, L. Bialkowska, H. Blume, C. Boimska, B. Botje, M. and Bracinik, J. Bramm, R. Buncic, P. Cerny, V. and Christakoglou, P. Chung, P. Chvala, O. Cramer, J. G. and Csato, P. Dinkelaker, P. Eckardt, V. Flierl, D. Fodor, Z. Foka, P. Friese, V. Gal, J. Gazdzicki, M. and Genchev, V. Georgopoulos, G. Gladysz, E. Grebieszkow, K. and Hegyi, S. Hoehne, C. Kadija, K. Karev, A. Kikola, D. and Kliemant, M. Kniege, S. Kolesnikov, V. I. Kornas, E. and Korus, R. Kowalski, M. Kraus, I. Kreps, M. Laszlo, A. and Lacey, R. van Leeuwen, M. Levai, P. Litov, L. and Lungwitz, B. Makariev, M. Malakhov, A. I. Mateev, M. and Melkumov, G. L. Mischke, A. Mitrovski, M. Molnar, J. and Mrowczynski, St. Nicolic, V. Palla, G. Panagiotou, A. D. and Panayotov, D. Petridis, A. Peryt, W. Pikna, M. Pluta, J. and Prindle, D. Puehlhofer, F. Renfordt, R. Roland, C. and Roland, G. Rybczynski, M. Rybicki, A. Sandoval, A. and Schmitz, N. Schuster, T. Seyboth, P. Sikler, F. Sitar, B. Skrzypczak, E. Slodkowski, M. Stefanek, G. Stock, R. and Strabel, C. Stroebele, H. Susa, T. Szentpetery, I. and Sziklai, J. Szuba, M. Szymanski, P. Trubnikov, V. Varga, D. Vassiliou, M. Veres, G. I. Vesztergombi, G. Vranic, D. Wetzler, A. Wlodarczyk, Z. Wojtaszek, A. Yoo, I. K. and Zimanyi, J.
Subjects: Nuclear Experiment
Abstract: Measurements of Bose-Einstein correlations of pi(-)pi(-) pairs in central Pb+Pb collisions were performed with the NA49 detector at the CERN Super Proton Synchroton for beam energies of 20A,30A,40A,80A, and 158A GeV. Correlation functions were measured in the longitudinally comoving “out-side-long” reference frame as a function of rapidity and transverse momentum in the forward hemisphere of the reaction. Radius and correlation strength parameters were obtained from fits of a Gaussian parametrization. The results show a decrease of the radius parameters with increasing transverse-momentum characteristic of strong radial flow in the pion source. No striking dependence on pion-pair rapidity or beam energy is observed. Static and dynamic properties of the pion source are obtained from simultaneous fits with a blast-wave model to radius parameters and midrapidity transverse-momentum spectra. Predictions of hydrodynamic and microscopic models of Pb+Pb collisions are discussed.
Published: 2008

105. Energy dependence of Lambda and Xi production in central Pb plus Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV measured at the CERN Super Proton Synchrotron

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. and Betev, L. Bialkowska, H. Blume, C. Boimska, B. Botje, M. and Bracinik, J. Bramm, R. Buncic, P. Cerny, V. and Christakoglou, P. Chung, P. Chvala, O. Cramer, J. G. and Csato, P. Dinkelaker, P. Eckardt, V. Flierl, D. Fodor, Z. Foka, P. Friese, V. Gal, J. Gazdzicki, M. and Genchev, V. Gladysz, E. Grebieszkow, K. Hegyi, S. and Hoehne, C. Kadija, K. Karev, A. Kikola, D. Kliemant, M. and Kniege, S. Kolesnikov, V. I. Kornas, E. Kowalski, M. and Kraus, I. Kreps, M. Laszlo, A. Lacey, R. van Leeuwen, M. and Levai, P. Litov, L. Lungwitz, B. Makariev, M. and Malakhov, A. I. Mateev, M. Melkumov, G. L. Meurer, C. and Mischke, A. Mitrovski, M. Molnar, J. Mrowczynski, St. and Nicolic, V. Palla, G. Panagiotou, A. D. Panayotov, D. and Petridis, A. Peryt, W. Pikna, M. Pluta, J. Prindle, D. and Puehlhofer, F. Renfordt, R. Richard, A. Roland, C. and Roland, G. Rybczynski, M. Rybicki, A. Sandoval, A. and Schmitz, N. Schuster, T. Seyboth, P. Sikler, F. Sitar, B. Skrzypczak, E. Slodkowski, M. Stefanek, G. Stock, R. and Strabel, C. Stroebele, H. Susa, T. Szentpetery, I. and Sziklai, J. Szuba, M. Szymanski, P. Trubnikov, V. Utvic, M. Varga, D. Vassiliou, M. Veres, G. I. Vesztergombi, G. and Vranic, D. Wetzler, A. Wlodarczyk, Z. Wojtaszek, A. and Yoo, I. K. Zimanyi, J. NA49 Collaboration
Subjects: Nuclear Theory, High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Results on Lambda, (Lambda) over bar, Xi(-), and (Xi) over bar (+) production in central Pb+Pb reactions at 20A, 30A, 40A, 80A, and 158A GeV are presented. The energy dependence of transverse mass spectra, rapidity spectra, and multiplicities is discussed. Comparisons to string hadronic models (UrQMD and HSD) and statistical hadron gas models are shown. Although the latter provide a reasonable description of all particle yields, the first class of models fails to match the Xi(-) and (Xi) over bar (+) multiplicities.
Published: 2008

106. Energy dependence of multiplicity fluctuations in heavy ion collisions at 20A to 158A GeV

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. and Betev, L. Bialkowska, H. Blume, C. Boimska, B. Botje, M. and Bracinik, J. Bramm, R. Buncic, P. Cerny, V. and Christakoglou, P. Chung, P. Chvala, O. Cramer, J. G. and Csato, P. Dinkelaker, P. Eckardt, V. Flierl, D. Fodor, Z. Foka, P. Friese, V. Gal, J. Gazdzicki, M. and Genchev, V. Georgopoulos, G. Gladysz, E. Grebieszkow, K. and Hegyi, S. Hoehne, C. Kadija, K. Karev, A. Kikola, D. and Kliemant, M. Kniege, S. Kolesnikov, V. I. Kornas, E. and Korus, R. Kowalski, M. Kraus, I. Kreps, M. Laszlo, A. and Lacey, R. van Leeuwen, M. Levai, P. Litov, L. and Lungwitz, B. Makariev, M. Malakhov, A. I. Mateev, M. and Melkumov, G. L. Mischke, A. Mitrovski, M. Molnar, J. and Mrowczynski, St. Nicolic, V. Palla, G. Panagiotou, A. D. and Panayotov, D. Petridis, A. Peryt, W. Pikna, M. Pluta, J. and Prindle, D. Puehlhofer, F. Renfordt, R. Roland, C. and Roland, G. Rybczynski, M. Rybicki, A. Sandoval, A. and Schmitz, N. Schuster, T. Seyboth, P. Sikler, F. Sitar, B. Skrzypczak, E. Slodkowski, M. Stefanek, G. Stock, R. and Strabel, C. Stroebele, H. Susa, T. Szentpetery, I. and Sziklai, J. Szuba, M. Szymanski, P. Trubnikov, V. Utvic, M. Varga, D. Vassiliou, M. Veres, G. I. Vesztergombi, G. and Vranic, D. Wetzler, A. Wlodarczyk, Z. Wojtaszek, A. and Yoo, I. K. Zimanyi, J.
Subjects: Nuclear Experiment
Abstract: Multiplicity fluctuations of positively, negatively, and all charged hadrons in the forward hemisphere were studied in central Pb+ Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV. The multiplicity distributions and their scaled variances. are presented as functions of their dependence on collision energy as well as on rapidity and transverse momentum. The distributions have bell-like shapes and their scaled variances are in the range from 0.8 to 1.2 without any significant structure in their energy dependence. No indication of the critical point in fluctuations are observed. The string-hadronic ultrarelativistic quantum molecular dynamics (UrQMD) model significantly overpredicts the mean, but it approximately reproduces the scaled variance of the multiplicity distributions. The predictions of the statistical hadron-resonance gas model obtained within the grand-canonical and canonical ensembles disagree with the measured scaled variances. The narrower than Poissonian multiplicity fluctuations measured in numerous cases may be explained by the impact of conservation laws on fluctuations in relativistic systems.
Published: 2008

107. Energy dependence of meson production in central Pb+Pb collisions at sNN=6 to 17 GeV

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. Betev, L. Białkowska, H. Blume, C. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Bunčić, P. Cerny, V. Christakoglou, P. Chung, P. Chvala, O. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Flierl, D. Fodor, Z. Foka, P. Friese, V. Gál, J. Gaździcki, M. Genchev, V. Georgopoulos, G. Gładysz, E. Grebieszkow, K. Hegyi, S. Höhne, C. Kadija, K. Karev, A. Kikola, D. Kliemant, M. Kniege, S. Kolesnikov, V.I. Kollegger, T. Kornas, E. Korus, R. Kowalski, M. Kraus, I. Kreps, M. Kresan, D. Laszlo, A. Lacey, R. Van Leeuwen, M. Lévai, P. Litov, L. Lungwitz, B. Makariev, M. Malakhov, A.I. Mateev, M. Melkumov, G.L. Mischke, A. Mitrovski, M. Molnár, J. Mrówczyński, S. Nicolic, V. Pálla, G. Panagiotou, A.D. Panayotov, D. Petridis, A. Peryt, W. Pikna, M. Pluta, J. Prindle, D. Pühlhofer, F. Renfordt, R. Roland, C. Roland, G. Rybczyński, M. Rybicki, A. Sandoval, A. Schmitz, N. Schuster, T. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Slodkowski, M. Stefanek, G. Stock, R. Strabel, C. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Szuba, M. Szymanski, P. Trubnikov, V. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wetzler, A. Włodarczyk, Z. Yoo, I.K. Zimányi, J.
Subjects: High Energy Physics::Experiment, Nuclear Experiment
Abstract: Meson production is studied by the NA49 Collaboration in central Pb+Pb collisions at 20A,30A,40A,80A, and 158A GeV beam energy. The data are compared with measurements at lower and higher energies and with microscopic and thermal models. The energy dependence of yields and spectral distributions is compatible with the assumption that partonic degrees of freedom set in at low SPS energies. © 2008 The American Physical Society.
Published: 2008

108. Pion and kaon production in central Pb plus Pb collisions at 20A and 30A GeV: evidence for the onset of deconfinement

Author: Antičić, Tome, Alt, C., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J. G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kikola, D, Kliemant, M., Kniege, S., Kolesnikov, V. I., Kollegger, T., Kornas, E., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, S., Nikolić, V., Palla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Peryt, W, Pikna, M., Pluta, J., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, D., Wetzler, A., Wlodarczyk, Z., Wojtaszek, A., Yoo, I. K., and Zimanyi, J.
Subjects: CERN, NA49, Pb+Pb, pion, kaon, deconfinement, Physics, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Results on charged pion and kaon production in central Pb+Pb collisions at 20A and 30A GeV are presented and compared to data at lower and higher energies. Around 30A GeV a rapid change of the energy dependence for the yields of pions and kaons as well as for the shape of the transverse mass spectra is observed. The change is compatible with the prediction that the threshold for production of a state of deconfined matter at the early stage of the collisions is located at low CERN Super Proton Synchroton energies.
Published: 2008

109. Bose-Einstein correlations of $\pi^{-}\pi^{-}$ pairs in central Pb+Pb collisions at 20A,30A,40A,80A, and 158A GeV

Author: Alt, C., Antičić, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J. G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kikola, D, Kliemant, M., Kniege, S., Kolesnikov, V. I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, S., Nikolić, V., Palla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Peryt, W, Pikna, M., Pluta, J., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Šuša, T., Szentpetery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, D., Wetzler, A., Wlodarczyk, Z., Wojtaszek, A., Yoo, I. K., and Zimanyi, J.
Subjects: Physics, Nuclear Theory, Nuclear Physics - Experiment, SPS, pion, bose-einstein, correlations, QGP, Pb+Pb, Nuclear Experiment
Abstract: Measurements of Bose-Einstein correlations of pi-pi- pairs in central Pb+Pb collisions were performed with the NA49 detector at the CERN Super Proton Synchroton for beam energies of 20A, 30A, 40A, 80A, and 158A GeV. Correlation functions were measured in the longitudinally co-moving ``out-side-long'' reference frame as a function of rapidity and transverse momentum in the forward hemisphere of the reaction. Radius and correlation strength parameters were obtained from fits of a Gaussian parametrization. The results show a decrease of the radius parameters with increasing transverse momentum characteristic of strong radial flow in the pion source. No striking dependence on pion-pair rapidity or beam energy is observed. Static and dynamic properties of the pion source are obtained from simultaneous fits with a blast-wave model to radius parameters and midrapidity transverse momentum spectra. Predictions of hydrodynamic and microscopic models of Pb+Pb collisions are discussed.
Published: 2007

110. Recent results on (anti)nucleus and (anti)hyperon production in nucleus-nucleus collisions at CERN SPS energies

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Białkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Bunčić, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J. G., Csató, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gál, J., Gaździcki, M., Genchev, V., Georgopoulos, G., Gładysz, E., Grebieszkow, K., Hegyi, S., Höhne, C., Kadija, K., Karev, A., Kikola, D., Kliemant, M., Kniege, S., Kolesnikov, V. I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R., Leeuwen, M., Lévai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnár, J., Mrówczyński, St, Nicolic, V., Pálla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Peryt, W., Pikna, M., Pluta, J., Prindle, D., Pühlhofer, F., Renfordt, R., Roland, C., Roland, G., Maciej Rybczynski, Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Siklér, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Ströbele, H., Susa, T., Szentpétery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, D., Wetzler, A., Włodarczyk, Z., Wojtaszek, A., Yoo, I. K., Zimányi, J., and Melkumov, G.
Subjects: Mass number, Physics, Nuclear Theory, Hyperon, FOS: Physical sciences, Inverse, Strangeness, 7. Clean energy, Hadronization, Nuclear physics, Baryon, Rapidity, Nuclear Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, NA49 experiment
Abstract: The NA49 experiment has collected comprehensive data on particle production in nucleus-nucleus collisions over the whole SPS beam energies range, the critical energy domain where the expected phase transition to a deconfined phase is expected to occur. The latest results from Pb+Pb collisions between 20$A$ GeV and 158$A$ GeV on baryon stopping and light nuclei production as well as those for strange hyperons are presented. The measured data on $p$, $\bar{p}$, $\Lambda$, $\bar{\Lambda}$, $\Xi^-$ and $\bar{\Xi}^+$ production were used to evaluate the rapidity distributions of net-baryons at SPS energies and to compare with the results from the AGS and the RHIC for central Pb+Pb (Au+Au) collisions. The dependence of the yield ratios and the inverse slope parameter of the $m_t$ spectra on the collision energy and centrality, and the mass number of the produced nuclei $^3He$, $t$, $d$ and $\bar{d}$ are discussed within coalescence and statistical approaches. Analysis of the total multiplicity exhibits remarkable agreement between the measured yield for $^3He$ and those predicted by the statistical hadronization model. In addition, new results on $\Lambda$ and $\bar{\Lambda}$ as well as $\Xi^-$ production in minimum bias Pb+Pb reactions at 40$A$ GeV and 158$A$ GeV and central C+C, Si+Si and Pb+Pb collisions are presented. The system size dependence of the yields of these hyperons was analysed to determine the evolution of strangeness enhancement relative to elementary p+p collisions., Comment: Presented at Critical Point and Onset of Deconfinement 4th International Workshop, July 9-13 2007, GSI Darmstadt,Germany}
Published: 2007

111. Event-by-event transverse momentum fluctuations in nuclear collisions at CERN SPS

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Białkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Bunčić, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J. G., Csató, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gál, J., Gaździcki, M., Genchev, V., Georgopoulos, G., Gładysz, E., Grebieszkow, K., Hegyi, S., Höhne, C., Kadija, K., Karev, A., Kikola, D., Kliemant, M., Kniege, S., Kolesnikov, V. I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R., Leeuwen, M., Lévai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnár, J., Mrówczyński, St, Nicolic, V., Pálla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Peryt, W., Pikna, M., Pluta, J., Prindle, D., Pühlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczyński, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Siklér, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Ströbele, H., Susa, T., Szentpétery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, D., Wetzler, A., Zbigniew Wlodarczyk, Wojtaszek, A., Yoo, I. K., and Zimány, J.
Subjects: Nuclear physics, Physics, Large Hadron Collider, Event (relativity), Transverse momentum, Nuclear Theory, FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nuclear Physics
Abstract: The latest NA49 results on event-by-event transverse momentum fluctuations are presented for central Pb+Pb interactions over the whole SPS energy range (20A - 158A GeV). Two different methods are applied: evaluating the $\Phi_{p_{T}}$ fluctuation measure and studying two-particle transverse momentum correlations. The obtained results are compared to predictions of the UrQMD model. The results on the energy dependence are compared to the NA49 data on the system size dependence. The NA61 (SHINE, NA49-future) strategy of searching of the QCD critical end-point is also discussed., Comment: proceedings article from CPOD07 (figure 7 - updated, reference 2 - modified)
Published: 2007

112. Energy dependence of multiplicity fluctuations in heavy ion collisions

Author: Alt, Christopher, Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Białkowska, H., Blume, Christoph, Boimska, B., Botje, M., Bracinik, J., Bramm, R., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J. G., Csató, P., Dinkelaker, Peter, Eckard, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gál, J., Gazdzicki, Marek, Genchev, V., Georgopoulos, G., Gładysz, E., Grebieszkow, K., Hegyi, S., Höhne, C., Kadija, K., Karev, A., Kikola, D., Kliemant, M., Kniege, S., Kolesnikov, V., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R, Leeuwen, Marco van, Lévai, P., Litov, L., Lungwitz, Benjamin, Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnár, J., Mrówczynski, St., Nicolic, V., Nicolic, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Peryt, W., Pikna, M., Pluta, J., Prindle, D., Pühlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, Andres, Schmitz, N., Schuster, T., Seyboth, P., Siklér, F., Sitar, B., Skrzypczaki, E., Slodkowski, M., Stefanek, G., Stock, Reinhard, Strabel, C., Ströbele, Herbert, Susa, T., Szentpétery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranic, D., Wetzler, A., Włodarczyk, Z., Wojtaszek, A., Yoo, I. K., Zimányi, József, and Correlations and Fluctuations in Relativistic Nuclear Collisions July 7-9 2006 Florence, Italy
Subjects: Nuclear Theory, High Energy Physics::Experiment, ddc:530, Nuclear Experiment
Abstract: The energy dependence of multiplicity fluctuations was studied for the most central Pb+Pb collisions at 20A, 30A, 40A, 80A and 158A GeV by the NA49 experiment at the CERN SPS. The multiplicity distribution for negatively and positively charged hadrons is significantly narrower than Poisson one for all energies. No significant structure in energy dependence of the scaled variance of multiplicity fluctuations is observed. The measured scaled variance is lower than the one predicted by the grand-canonical formulation of the hadron-resonance gas model. The results for scaled variance are in approximate agreement with the string-hadronic model UrQMD.
Published: 2007

113. Inclusive production of charged pions in p+C collisions at 158 GeV/c beam momentum

Author: Alt, C. Baatar, B. Barna, D. Barr, G. Bartke, J. Betev, L. Białkowska, H. Blume, C. Boimska, B. Bracinik, J. Bramm, R. Bunčić, P. Cerny, V. Christakoglou, P. Chvala, O. Dinkelaker, P. Dolejsi, J. Eckardt, V. Fischer, H.G. Flierl, D. Fodor, Z. Foka, P. Friese, V. Gaździcki, M. Georgopoulos, G. Höhne, C. Karev, A. Kniege, S. Kollegger, T. Kolesnikov, V.I. Kornas, E. Kowalski, M. Kraus, I. Kreps, M. Litov, L. Makariev, M. Malakhov, A.I. Mateev, M. Melkumov, G.L. Mitrovski, M. Pálla, G. Panagiotou, A.D. Panayotov, D. Pattison, C. Petridis, A. Renfordt, R. Rybicki, A. Sandoval, A. Schmitz, N. Seyboth, P. Siklér, F. Stock, R. Ströbele, H. Sziklai, J. Szymanski, P. Trubnikov, V. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wenig, S. Wetzler, A. Zaranek, J.
Subjects: High Energy Physics::Experiment, Nuclear Experiment
Abstract: The production of charged pions in minimum bias p+C interactions is studied using a sample of 377000 inelastic events obtained with the NA49 detector at the CERN SPS at 158 GeV/c beam momentum. The data cover a phase space area ranging from 0 to 1.8 GeV/c in transverse momentum and from -0.1 to 0.5 in Feynman xF. Inclusive invariant cross sections are given on a grid of 270 bins per charge, thus offering for the first time a dense coverage of the projectile hemisphere and of the cross-over region into the target fragmentation zone. © 2007 Springer-Verlag.
Published: 2007

114. Elliptic flow of Lambda hyperons in Pb+Pb collisions at 158A GeV

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. and Betev, L. Bialkowska, H. Blume, C. Boimska, B. Botje, M. and Bracinik, J. Bramm, R. Buncic, P. Cerny, V. and Christakoglou, P. Chung, P. Chvala, O. Cramer, J. G. and Csato, P. Dinkelaker, P. Eckardt, V. Flierl, D. Fodor, Z. Foka, P. Friese, V. Gal, J. Gazdzicki, M. and Georgopoulos, G. Gladysz, E. Grebieszkow, K. Hegyi, S. and Hoehne, C. Kadija, K. Karev, A. Kliemant, M. Kniege, S. and Kolesnikov, V. I. Kornas, E. Korus, R. Kowalski, M. and Kraus, I. Kreps, M. Lacey, R. Laszlo, A. van Leeuwen, M. and Levai, P. Litov, L. Lungwitz, B. Makariev, M. and Malakhov, A. I. Mateev, M. Melkumov, G. L. Mischke, A. and Mitrovski, M. Molnar, J. Mrowczynski, St. Nicolic, V. and Palla, G. Panagiotou, A. D. Panayotov, D. Petridis, A. and Pikna, M. Prindle, D. Puehlhofer, F. Renfordt, R. and Roland, C. Roland, G. Rybczynski, M. Rybicki, A. and Sandoval, A. Schmitz, N. Schuster, T. Seyboth, P. and Sikler, F. Sitar, B. Skrzypczak, E. Stefanek, G. Stock, R. Strabel, C. Stroebele, H. Susa, T. Szentpetery, I. and Sziklai, J. Szymanski, P. Trubnikov, V. Varga, D. and Vassiliou, M. Veres, G. I. Vesztergombi, G. Vranic, D. and Wetzler, A. Wlodarczyk, Z. Wojtaszek, A. Yoo, I. K. and Zimanyi, J. NA49 Collaboration
Subjects: Nuclear Theory, Nuclear Experiment
Abstract: The elliptic flow of Lambda hyperons has been measured by the NA49 Collaboration at the CERN-SPS in semicentral Pb+Pb collisions at 158A GeV. The standard method of correlating particles with the event plane was used. Measurements of v(2) near midrapidity are reported as a function of rapidity, centrality and transverse momentum. Elliptic flow of Lambda particles increases both with the impact parameter and with the transverse momentum. It is compared with v(2) for pions and protons as well as with model calculations. The observation of significant elliptic flow and its mass dependence suggest strong collective behavior of the matter produced in collisions of heavy nuclei already at the SPS. Scaling properties of elliptic flow of different particle species have been tested at 158A GeV. The limited p(T) range of the data does not allow for a decisive test of the coalescence model.
Published: 2007

115. Centrality and system size dependence of multiplicity fluctuations in nuclear collisions at 158A GeV

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. and Betev, L. Bialkowska, H. Blume, C. Boimska, B. Botje, M. and Bracinik, J. Bramm, R. Buncic, P. Cerny, V. and Christakoglou, P. Chung, P. Chvala, O. Cramer, J. G. and Csato, P. Dinkelaker, P. Eckardt, V. Flierl, D. Fodor, Z. Foka, P. Friese, V. Gl, J. Gazdzicki, M. Genchev, V. Georgopoulos, G. Gladysz, E. Grebieszkow, K. Hegyi, S. Hoehne, C. Kadija, K. Karev, A. Kikola, D. and Kliemant, M. Kniege, S. Kolesnikov, V. I. Kornas, E. and Korus, R. Kowalski, M. Kraus, I. Kreps, M. Laszlo, A. and Lacey, R. van Leeuwen, M. Levai, P. Litov, L. and Lungwitz, B. Makariev, M. Malakhov, A. I. Mateev, M. and Melkumov, G. L. Mischke, A. Mitrovski, M. Molnar, J. and Mrowczynski, St. Nicolic, V. Palla, G. Panagiotou, A. D. and Panayotov, D. Peryt, W. Petridis, A. Pikna, M. Pluta, J. and Prindle, D. Puehlhofer, F. Renfordt, R. Roland, C. and Roland, G. Rybczynski, M. Rybicki, A. Sandoval, A. and Schmitz, N. Schuster, T. Seyboth, P. Sikler, F. Sitar, B. Skrzypczak, E. Slodkowski, M. Stefanek, G. Stock, R. and Strabel, C. Stroebele, H. Susa, T. Szentpetery, I. and Sziklai, J. Szuba, M. Szymanski, P. Trubnikov, V. Varga, D. Vassiliou, M. Veres, G. I. Vesztergombi, G. Vranic, D. Wetzler, A. Wlodarczyk, Z. Wojtaszek, A. Yoo, I. K. and Zimnyi, J. NA49 Collaboration
Subjects: Nuclear Experiment
Abstract: The centrality and system size dependence of multiplicity fluctuations of charged particles produced in nuclear collisions at 158A GeV was studied by the NA49 Collaboration. Centrality selected Pb+Pb collisions, semicentral C+C and Si+Si collisions as well as inelastic p+p interactions were analyzed. The number of projectile participants determined on an event-by-event basis was used to characterize the collision centrality. The scaled variance of the multiplicity distribution obtained in the forward rapidity region (1.1 < y(c.m.)< 2.6) shows a significant increase toward peripheral collisions. The results are similar for negatively and positively charged particles and about 50% larger for all charged particles. String-hadronic models of nuclear reactions without the fusion process do not reproduce the rise of fluctuations from central toward peripheral collisions. The measured centrality dependence can be reproduced in superposition models with the assumption of contributions from target participants to particle production in the forward hemisphere or in string models with fusion.
Published: 2007

116. Pion and kaon production in central Pb+Pb collisions at 20A and 30A GeV: Evidence for the onset of deconfinement

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kikola, D., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kollegger, T., Kornas, E., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Nicolic, V., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Peryt, W., Pikna, M., Pluta, J., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., and Zimanyi, J.
Subjects: Nuclear Theory, FOS: Physical sciences, Nuclear Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: Results on charged pion and kaon production in central Pb+Pb collisions at 20A and 30A GeV are presented and compared to data at lower and higher energies. A rapid change of the energy dependence is observed around 30A GeV for the yields of pions and kaons as well as for the shape of the transverse mass spectra. The change is compatible with the prediction that the threshold for production of a state of deconfined matter at the early stage of the collisions is located at low SPS energies., Comment: 12 pages, 8 figures
Published: 2007
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117. Rapidity and energy dependence of the electric charge correlations in A+A collisions at the SPS energies

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kikola, D., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Nicolic, V., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Peryt, W., Pikna, M., Pluta, J., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Wojtaszek, A., Yoo, I.K., and Zimanyi, J.
Subjects: FOS: Physical sciences, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract: Results from electric charge correlations studied with the Balance Function method in A+A collisions from 20\emph{A} to 158\emph{A} GeV are presented in two different rapidity intervals: In the mid-rapidity region we observe a decrease of the width of the Balance Function distribution with increasing centrality of the collision, whereas this effect vanishes in the forward rapidity region. Results from the energy dependence study in central Pb+Pb collisions show that the narrowing of the Balance Function expressed by the normalised width parameter \textit{W} increases with energy towards the highest SPS and RHIC energies. Finally we compare our experimental data points with predictions of several models. The hadronic string models UrQMD and HIJING do not reproduce the observed narrowing of the Balance Function. However, AMPT which contains a quark-parton transport phase before hadronization can reproduce the narrowing of the BF's width with centrality. This confirms the proposed sensitivity of the Balance Function analysis to the time of hadronization., Comment: Submitted in Phys. Rev. C
Published: 2007
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118. Energy, Rapidity and Transverse Momentum Dependence of Multiplicity Fluctuations in Heavy Ion Collisions at CERN SPS

Author: Lungwitz, Benjamin, Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kikola, D., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R., van Leeuwen, M., Levai, P., Litov, L., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Nicolic, V., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Peryt, W., Pikna, M., Pluta, J., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Wojtaszek, A., Yoo, I.K., and Zimanyi, J.
Subjects: FOS: Physical sciences, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nuclear Physics
Abstract: Multiplicity fluctuations in the forward hemisphere were studied for positively, negatively and all charged hadrons produced in central Pb+Pb collisions at 20A, 30A, 40A, 80A and 158A GeV. The multiplicity distributions and their scaled variances are presented as a function of collision energy, rapidity and transverse momentum. The distributions have a bell-like shape and the scaled variance changes monotonously with energy in the range from 0.8 to 1.2. No indication of the critical point is observed. The string-hadronic model UrQMD reproduces results on the scaled variance. The predictions of the hadron-resonance gas model obtained within the grand-canonical and canonical ensembles for the scaled variance disagree with the data., Comment: presented at Critical Point and Onset of Deconfinement, 4th International Workshop, July 9-13 2007, GSI Darmstadt, Germany, updated version including referee comments
Published: 2007
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119. Rapidity and energy dependence of the electric charge correlations in A+A collisions from 20A to 158A GeV

Author: Alt, C. Anticic, T. Baatar, B. Barna, D. Bartke, J. Betev, L. Białkowska, H. Blume, C. Boimska, B. Botje, M. Bracinik, J. Bramm, R. Bunčić, P. Cerny, V. Christakoglou, P. Chung, P. Chvala, O. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Flierl, D. Fodor, Z. Foka, P. Friese, V. Gál, J. Gaździcki, M. Genchev, V. Georgopoulos, G. Gładysz, E. Grebieszkow, K. Hegyi, S. Höhne, C. Kadija, K. Karev, A. Kikola, D. Kliemant, M. Kniege, S. Kolesnikov, V.I. Kornas, E. Korus, R. Kowalski, M. Kraus, I. Kreps, M. Laszlo, A. Lacey, R. Van Leeuwen, M. Lévai, P. Litov, L. Lungwitz, B. Makariev, M. Malakhov, A.I. Mateev, M. Melkumov, G.L. Mischke, A. Mitrovski, M. Molnár, J. Mrówczyński, St. Nicolic, V. Pálla, G. Panagiotou, A.D. Panayotov, D. Petridis, A. Peryt, W. Pikna, M. Pluta, J. Prindle, D. Pühlhofer, F. Renfordt, R. Roland, C. Roland, G. Rybczyński, M. Rybicki, A. Sandoval, A. Schmitz, N. Schuster, T. Seyboth, P. Siklér, F. Sitar, B. Skrzypczak, E. Slodkowski, M. Stefanek, G. Stock, R. Strabel, C. Ströbele, H. Susa, T. Szentpétery, I. Sziklai, J. Szuba, M. Szymanski, P. Trubnikov, V. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wetzler, A. Włodarczyk, Z. Wojtaszek, A. Yoo, I.K. Zimányi, J.
Subjects: High Energy Physics::Experiment, Nuclear Experiment
Abstract: Results from electric charge correlations studied with the Balance Function (BF) method in A+A collisions from 20A to 158A GeV are presented in two different rapidity intervals: In the midrapidity region we observe a decrease of the width of the BF distribution with increasing centrality of the collision, whereas this effect vanishes in the forward rapidity region. Results from the energy dependence study in central Pb+Pb collisions show that the narrowing of the BF expressed by the normalized width parameter W increases with energy toward the highest CERN Super Proton Synchrotron and BNL Relativistic Heavy Ion Collider energies. Finally we compare our experimental data points with the predictions of several models. The hadronic string models Ultra-relativistic Quantum Molecular Dynamics and Heavy Ion Jet INteraction Generator (HIJING) do not reproduce the observed narrowing of the BF. However, A MultiPhase Transport medel (AMPT), which contains a quark-parton transport phase before hadronization, can reproduce the narrowing of the BF's width with centrality. This confirms the proposed sensitivity of the BF analysis to the time of hadronization. © 2007 The American Physical Society.
Published: 2007

120. High p_T Spectra of Identified Particles Produced in Pb+Pb Collisions at 158A GeV Beam Energy

Author: Schuster, T., Laszlo, Andras, Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kikola, D., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Lacey, R., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Nicolic, V., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Peryt, W., Pikna, M., Pluta, J., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., and Zimanyi, J.
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Meson, Hadron, Nuclear Theory, FOS: Physical sciences, Modification factor, Spectral line, Baryon, Nuclear physics, Transverse momentum, Nuclear Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam energy
Abstract: Results of the NA49 collaboration on the production of hadrons with large transverse momentum in Pb+Pb collisions at 158A GeV beam energy are presented. A range up to p_T = 4 GeV/c is covered. The nuclear modification factor R_CP is extracted for pions, kaons and protons, and the baryon to meson ratios p/pi+, pbar/pi- and Lambda/K^0_s are studied. All results are compared to other measurements at SPS and RHIC and to theoretical calculations., Submitted to J. Phys. G (Proceedings of the 9th International Conference on Strangeness in Quark Matter, Los Angeles, USA, March 26-31, 2006). 5 pages, 3 figures
Published: 2006

121. Strangeness production at SPS energies

Author: Mitrovski, Michael K., Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kikola, D., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Meurer, C., Mischke, A., Molnar, J., Mrowczynski, St., Nicolic, V., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Peryt, W., Pikna, M., Pluta, J., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., and Zimanyi, J.
Subjects: Nuclear Experiment, Nuclear Physics
Abstract: We present a summary of measurements of strange particles performed by the experiment NA49 in central and minimum bias Pb+Pb collisions in the beam energy range 20A - 158A GeV. New results on $\Xi$ production in central Pb+Pb collisions and on $\Lambda, \Xi$ production in minimum bias collisions are shown. Transverse mass spectra and rapidity distributions of strange particles at different energies are compared. The energy dependence of the particle yields and ratios is discussed. NA49 measurements of the $\Lambda$ and $\Xi$ enhancement factors are shown for the first time.
Published: 2006

122. Upper limit of D-0 production in central Pb-Pb collisions at 158A GeV

Author: Alt, C Anticic, T Baatar, B Barna, D Bartke, J and Betev, L Bialkowska, H Blume, C Boimska, B Botje, M and Bracinik, J Bramm, R Buncic, P Cerny, V Christakoglou, P and Chvala, O Cramer, JG Csato, P Dinkelaker, P Eckardt, V Flierl, D Fodor, Z Foka, P Friese, V Gal, J and Gazdzicki, M Genchev, V Georgopoulos, G Gladysz, E and Grebieszkow, K Hegyi, S Hohne, C Kadija, K Karev, A and Kliemant, M Kniege, S Kolesnikov, VI Kornas, E Korus, R and Kowalski, M Kraus, I Kreps, M van Leeuwen, M Levai, P Litov, L Lungwitz, B Makariev, M Malakhov, AI and Markert, C Mateev, M Melkumov, GL Mischke, A Mitrovski, M Molnar, J Mrowczynski, S Nicolic, V Palla, G and Panagiotou, AD Panayotov, D Petridis, A Pikna, M and Prindle, D Puhlhofer, F Renfordt, R Roland, C Roland, G and Rybczynski, M Rybicki, A Sandoval, A Schmitz, N and Schuster, T Seyboth, P Sikler, F Sitar, B Skrzypczak, E and Stefanek, G Stock, R Strobele, H Susa, T and Szentpetery, I Sziklai, J Szymanski, P Trubnikov, V and Varga, D Vassiliou, M Veres, GI Vesztergombi, G Vranic, D Wetzler, A Wlodarczyk, Z Yoo, IK Zimanyi, J NA49 Collaborat
Abstract: Results are presented from a search for the decays D-0-> K(-)pi(+) and (D) over bar (0)-> K(+)pi(-) in a sample of 3.8x10(6) central Pb-Pb events collected with a beam energy of 158A GeV by NA49 at the CERN SPS. No signal is observed. An upper limit on D-0 production is derived and compared to predictions from several models.
Published: 2006

123. Energy and centrality dependence of $\overline{p}$ and $p$ production and the $\overline{\lambda}/\overline{p}$ ratio in Pb+Pb collisions between 20A GeV and 158A GeV

Author: Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, Jerzy, Betev, L, Bialkowska, H, Blume, C, Boimska, B, Botje, M, Braconik, J, Bramm, R, Bruncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csató, P, Dinkelaker, P, Eckardt, V, Flierl, D, Fodor, Z, Foka, P, Friese, V, Gál, J, Gazdzicki, M, Genchev, V, Georgopoulos, G, Gladysz-Dziadus, E, Grebieszkow, K, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kliement, M, Kniege, S, Kolesnikov, V I, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Laslo, A, Van Leeuwen, M, Lévai, Peter, Litov, L, Lungwit5z, B, Makariev, M, Malakhov, A I, Mateev, M, Melkumov, G L, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Nicolic, V, Pálla, G, Panagiotou, A D, Panayotov, D, Petridis, A, Pikna, M, Prindle, D, Pühlhofer, F, Renfordt, R, Roland, C, Stefanel, G, Rybczynski, M, Rybicki, A, Sandoval, A, Schmitz, N, Schuster, T, Seyboth, T, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, G, Stock, R, Strabel, C, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Szymanski, P, Trubnikov, V, Varga, D, Vassiliou, Maria, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, and Zimányi, J
Subjects: High Energy Physics::Experiment, Nuclear Experiment, Particle Physics - Experiment
Abstract: The transverse mass $m_{t}$ distributions for antiprotons are measured at midrapidity for minimum bias Pb+Pb collisions at 158A GeV and for central Pb+Pb collisions at 20A, 30A, 40A, and 80A GeV beam energies in the fixed target experiment NA49 at the CERN SPS. The rapidity density $dn/dy$, inverse slope parameter $T$, and mean transverse mass left angle $\left \langle {m}_{t} \right \rangle$ derived from the $m_{t}$ distributions are studied as a function of the incident energy and the collision centrality and compared to the relevant data on proton production. The shapes of the $m_{t}$ distributions of $\bar{p}$ and $p$ are very similar. The ratios of the particle yields, $\bar{p}/p$ and $\Lambda/p\bar{p}$, are also analyzed. The $\bar{p}/p$ ratio exhibits an increase with decreasing centrality and a steep rise with increasing beam energy. The $\Lambda/\bar{p}$ ratio increases beyond unity with decreasing beam energy.
Published: 2006

124. Onset of deconfinement in Pb+Pb collisions at the CERN SPS

Author: Seyboth, P., Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J. G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Katarzyna Grebieszkow, Hegyi, S., Hoehne, C., Kadija, K., Karev, A., Kikola, D., Kliemant, M., Kniege, S., Kolesnikov, V. I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., Lacey, R., Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St, Nicolic, V., Palla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Peryt, W., Pikna, M., Pluta, J., Prindle, D., Puehlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Sikler, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Strabel, C., Stroebele, H., Susa, T., Szentpetery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I. K., and Zimanyi, J.
Subjects: High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Experiment, Nuclear Physics - Experiment, Nuclear Experiment
Abstract: The NA49 fixed-target experiment studied high energy-density matter produced in nucleus-nucleus reactions at the CERN SPS. In central Pb+Pb collisions at 158A GeV the energy density at the early stage substantially exceeds the threshold for quark deconfinement predicted by lattice QCD. The produced matter shows strong transverse and longitudinal flow. Ratios of yields of produced particles are approximately consistent with statistical equilibration. An energy scan through the SPS range revealed structure in the energy dependence of pion and kaon yields as well as of the inverse slopes of transverse mass distributions. These features suggest that a deconfined phase starts to be produced at around 30A GeV in central Pb+Pb collisions. The analysis of fluctuations and correlations has not yet provided evidence for the predicted critical point of QCD. The NA49 fixed-target experiment studied high energy-density matter produced in nucleus-nucleus reactions at the CERN SPS. In central Pb+Pb collisions at 158A GeV the energy density at the early stage substantially exceeds the threshold for quark deconfinement predicted by lattice QCD. The produced matter shows strong transverse and longitudinal flow. Ratios of yields of produced particles are approximately consistent with statistical equilibration. An energy scan through the SPS range revealed structure in the energy dependence of pion and kaon yields as well as of the inverse slopes of transverse mass distributions. These features suggest that a deconfined phase starts to be produced at around 30A GeV in central Pb+Pb collisions. The analysis of fluctuations and correlations has not yet provided evidence for the predicted critical point of QCD.
Published: 2006

125. Inclusive production of charged pions in p+p collisions at 158 GeV/c beam momentum

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Biakowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Dinkelaker, P., Dolejsi, J., Eckardt, V., Fischer, H.G., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gazdzicki, M., Grebieszkow, K., Hohne, C., Kadija, K., Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Lungwitz, B., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Mitrovski, M., Mrowczynski, S., Palla, G., Panayotov, D., Petridis, A., Renfordt, R., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Susa, T., Sziklai, J., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wenig, S., Wetzler, A., Wlodarczyk, Z., and Yoo, I.K.
Subjects: Physics, Energy loss, Particle physics, Large Hadron Collider, Physics and Astronomy (miscellaneous), CERN, NA49, charged pions, p+p, inclusive, Detector, FOS: Physical sciences, Invariant (physics), High Energy Physics - Experiment, symbols.namesake, High Energy Physics - Experiment (hep-ex), Pion, Phase space, Transverse momentum, symbols, Feynman diagram, High Energy Physics::Experiment, Nuclear Experiment, Engineering (miscellaneous), Particle Physics - Experiment
Abstract: New results on the production of charged pions in p+p interactions are presented. The data come from a sample of 4.8 million inelastic events obtained with the NA49 detector at the CERN SPS at 158 GeV/c beam momentum. Pions are identified by energy loss measurement in a large TPC tracking system which covers a major fraction of the production phase space. Inclusive invariant cross sections are given on a grid of nearly 300 bins per charge over intervals from 0 to 2 GeV/c in transverse momentum and from 0 to 0.85 in Feynman x. The results are compared to existing data in overlapping energy ranges., Comment: 54 pages, 54 figures, accepted for publication in EPJC
Published: 2006

126. Results from NA49

Author: Alt, C., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Bunčić, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Höhne, C., Kadija, Krešo, Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V. I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, S., Nikolić, Vedran, Palla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Pikna, M., Prindle, D., Pühlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strabel, C., Ströbele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., and Zimanyi, J.
Subjects: Nuclear Theory, hadron production, energy, system size, SPS, NA49, CERN, elliptic flow, deconfinement, High Energy Physics::Experiment, Nuclear Experiment
Abstract: An overview of results from the CERN experiment NA49 is presented with emphasis on most recent measurements. NA49 has systematically studied the dependence of hadron production on energy and system size or centrality. At top-SPS energy the detailed investigation of hadron production, now also extending to elliptic flow of Lambda-baryons and to identified particle yields at high p_t, shows that the created matter behaves in a similar manner as at RHIC energies. In the lower SPS energy range a distinct structure is observed in the energy dependence of the rate of strangeness production and in the slopes of p_t-spectra suggesting the onset of the creation of a deconfined phase of matter.
Published: 2006

127. Energy and centrality dependence of (p)over-bar and p production and the (Lambda)over-bar/(p)over-bar ratio in Pb plus Pb collisions between 20A GeV and 158A GeV

Author: Alt, C Anticic, T Baatar, B Barna, D Bartke, J and Betev, L Bialkowska, H Blume, C Boimska, B Botje, M and Bracinik, J Bramm, R Buncic, P Cerny, V Christakoglou, P and Chvala, O Cramer, JG Csato, P Dinkelaker, P Eckardt, V Flierl, D Fodor, Z Foka, P Friese, V Gal, J and Gazdzicki, M Genchev, V Georgopoulos, G Gladysz, E and Grebieszkow, K Hegyi, S Hohne, C Kadija, K Karev, A and Kliemant, M Kniege, S Kolesnikov, VI Kornas, E Korus, R and Kowalski, M Kraus, I Kreps, M Laslo, A van Leeuwen, M Levai, P Litov, L Lungwitz, B Makariev, M and Malakhov, AI Mateev, M Melkumov, GL Mischke, A and Mitrovski, M Molnar, J Mrowczynski, S Nicolic, V Palla, G Panagiotou, AD Panayotov, D Petridis, A Pikna, M and Prindle, D Puhlhofer, F Renfordt, R Roland, C Roland, G and Rybczynski, M Rybicki, A Sandoval, A Schmitz, N and Schuster, T Seyboth, P Sikler, F Sitar, B Skrzypczak, E and Stefanek, G Stock, R Strabel, C Strobele, H Susa, T and Szentpetery, I Sziklai, J Szymanski, P Trubnikov, V and Varga, D Vassiliou, M Veres, GI Vesztergombi, G Vranic, D Wetzler, A Wlodarczyk, Z Yoo, IK Zimanyi, J NA49 Collaborat
Subjects: High Energy Physics::Experiment, Nuclear Experiment
Abstract: The transverse mass m(t) distributions for antiprotons are measured at midrapidity for minimum bias Pb+Pb collisions at 158A GeV and for central Pb+Pb collisions at 20A, 30A, 40A, and 80A GeV beam energies in the fixed target experiment NA49 at the CERN SPS. The rapidity density dn/dy, inverse slope parameter T, and mean transverse mass < m(t)> derived from the m(t) distributions are studied as a function of the incident energy and the collision centrality and compared to the relevant data on proton production. The shapes of the m(t) distributions of (p) over bar and p are very similar. The ratios of the particle yields, (p) over bar /p and (p) over bar/(Lambda) over bar, are also analyzed. The (p) over bar /p ratio exhibits an increase with decreasing centrality and a steep rise with increasing beam energy. The (Lambda) over bar/(Lambda) over bar ratio increases beyond unity with decreasing beam energy.
Published: 2006

128. High pT Spectra of Identified Particles Produced in Pb+Pb Collisions at 158 GeV/nucleon Beam Energy

Author: Alt, C., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Bunčić, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Höhne, C., Kadija, Krešo, Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V. I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, S., Nikolić, Vedran, Palla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Pikna, M., Prindle, D., Pühlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strabel, C., Ströbele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., and Zimanyi, J.
Subjects: transverse momentum, spectra, NA49, SPS, CERN, high pT, Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Transverse momentum spectra of pi+, pi-, p, anti-p, K+, K-, K0s and Lambda at midrapidity were measured at high pT in Pb+Pb collisions at 158 GeV/nucleon beam energy by the NA49 experiment. Particle yield ratios (p/pi, K/pi and Lambda/K0s) show an enhancement of the baryon/meson ratio for pT > 2 GeV/c. The nuclear modification factor R_CP is extracted and compared to RHIC measurement and pQCD clculations.
Published: 2006

129. Rapidity Dependence of Bose-Einstein Correlations at SPS energies

Author: Kniege, S., Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Bunčić, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csató, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gál, J., Gaździcki, M., Genchev, V., Georgopoulos, G., Gładysz, E., Grebieszkow, K., Hegyi, S., Höhne, C., Kadija, K., Karev, A., Kliemant, M., Kolesnikov, V.I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., van Leeuwen, M., Lévai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Mischke, A., Mitrovski, M., Molnár, J., Mrówczyński, St., Nicolic, V., Pálla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Prindle, D., Pühlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczyński, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Siklér, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strabel, C., Ströbele, H., Susa, T., Szentpétery, I., Sziklai, J., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, D., Wetzler, A., Włodarczyk, Z., and Zimányi, J.
Subjects: Physics, Range (particle radiation), Large Hadron Collider, FOS: Physical sciences, Bose–Einstein correlations, Nuclear physics, Particle, Rapidity, Center of mass, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam energy, NA49 experiment, Nuclear Physics
Abstract: This article is devoted to results on pion-pion -Bose-Einstein correlations in central Pb+Pb collisions measured by the NA49 experiment at the CERN SPS. Rapidity as well as transverse momentum dependences of the correlation lengths will be shown for collisions at 20A, 30A, 40A, 80A, and 158A GeV beam energy. Only a weak energy dependence of the radii is observed at SPS energies. The kt-dependence of the correlation lengths as well as the single particle mt-spectra will be compared to model calculations. The rapidity dependence is analysed in a range of 2.5 units of rapidity starting at the center of mass rapidity at each beam energy. The correlation lengths measured in the longitudinally comoving system show only a weak dependence on rapidity., 7 pages, 4 figures, contribution to the Workshop on Particle Correlations and Femtoscopy, Kromeriz, August 15-17, 2005
Published: 2006

130. Elliptic flow of Lambda hyperons in Pb+Pb collisions at 158 AGeV

Author: Alt, C., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Bunčić, Predrag, Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Höhne, C., Kadija, Krešo, Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V. I., Kornas, E., Korus, R., Kowalski, M., Kraus, Ivica, Kreps, M., Laszlo, A., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, S., Nikolić, Vedran, Palla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Pikna, M., Prindle, D., Pühlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strabel, C., Ströbele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Szymanski, P., Trubnikov, V., Varga, Dražen, Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, Danilo, Wetzler, A., Wlodarczyk, Z., Yoo, I.K., and Zimanyi, J.
Subjects: Physics, Nuclear and High Energy Physics, Particle physics, Elliptic flow, Nuclear Theory, Hyperon, Lambda, Nuclear physics, Pion, Rapidity, Impact parameter, Nuclear Experiment, Event (particle physics), CERN, NA49, elliptic flow, mid-rapidity, lambda, NA49 experiment, Nuclear Physics
Abstract: The elliptic flow of $\Lambda$ hyperons has been measured by the NA49 experiment in semi-central Pb+Pb collisions at 158A GeV. The standard method of correlating particles with an event plane has been used. Measurements of $v_2$ near mid-rapidity are reported as a function of rapidity, centrality and transverse momentum. Elliptic flow of Lambda particles increases both with the impact parameter and with the transverse momentum. It is compared with $v_2$ for pions and protons as well as with models predictions. The elliptic flow of Λ hyperons has been measured by the NA49 experiment in semi-central Pb+Pb collisions at 158 A GeV. The standard method of correlating particles with an event plane has been used. Measurements of v 2 near mid-rapidity are reported as a function of rapidity, centrality and transverse momentum. Elliptic flow of Lambda particles increases both with the impact parameter and with the transverse momentum. It is compared with v 2 for pions and protons as well as with models predictions.
Published: 2006

131. Energy and centrality dependence of antiproton and proton production in relativistic Pb+Pb collisions at the CERN SPS

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laslo, A., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Nicolic, V., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., and Zimanyi, J.
Subjects: Physics::Accelerator Physics, High Energy Physics::Experiment, Nuclear Experiment, Nuclear Physics
Abstract: The transverse mass distributions for antiprotons are measured at midrapidity for minimum bias Pb+Pb collisions at 158A GeV and for central Pb+Pb collisions at 20, 30, 40 and 80 A GeV beam energies in the NA49 experiment at the CERN SPS. The rapidity density, inverse slope parameter and mean transverse mass derived from the transverse mass distributions are studied as a function of the incident energy and the collision centrality and compared to the relevant proton data. The shapes of the m_T distributions of antiprotons and protons are very similar. The ratios of the particle yields, antiproton/proton and antilambda/antiproton, are also analysed. The antiproton/proton ratio exhibits an increase with diminishing centrality and a steep rise with increasing beam energy. The antilambda/antiproton ratio increases beyond unity with decreasing beam energy. The transverse mass distributions for antiprotons are measured at midrapidity for minimum bias Pb+Pb collisions at 158A GeV and for central Pb+Pb collisions at 20A, 30A, 40A and 80A GeV beam energies in the fixed target experiment NA49 at the CERN SPS. The rapidity density, inverse slope parameter and mean transverse mass derived from the transverse mass distributions are studied as a function of the incident energy and the collision centrality and compared to the relevant data on proton production. The shapes of the transverse mass distributions of antiproton and proton are very similar. The ratios of the particle yields, antiproton/proton and antilambda/antiproton, are also analysed. The antiproton to proton ratio exhibits an increase with decreasing centrality and a steep rise with increasing beam energy. The antilambda to antiproton ratio increases beyond unity with decreasing beam energy.
Published: 2005

132. Main Physics Results and further Analysis Plans of the NA49 Collaboration on Nucleus-Nucleus Collisions at SPS Energies-2005-041

Author: Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, Jerzy, Betev, L, Bialkowska, H, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Buncic, P, Cerny, V, Christakoglou, P, Chung, P, Chvala, O, Cramer, J G, Csató, P, Dinkelaker, P, Eckardt, V, Flierl, D, Fodor, Z, Foka, P, Friese, V, Gál, J, Gazdzicki, M, Genchev, V, Georgopoulos, G, Gladysz-Dziadus, E, Grebieszkow, K, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kikola, D, Kliemant, M, Kniege, S, Kolesnikov, V I, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Laszlo, A, Lacey, R, Van Leeuwen, M, Lévai, Peter, Litov, L, Lungwitz, B, Makariev, M, Malakhov, A I, Mateev, M, Melkumov, G L, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Nicolic, V, Pálla, G, Panagiotou, A D, Panayotov, D, Petridis, A, Peryt, W, Pikna, M, Pluta, J, Prindle, D, Pühlhofer, F, Renfordt, R, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Schmitz, N, Schuster, T, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Slodkowski, M, Stefanek, G, Stock, R, Strabel, C, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Szuba, M, Szymanski, P, Trubnikov, V, Varga, D, Vassiliou, Maria, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo,I K, and Zimányi, J
Subjects: Detectors and Experimental Techniques
Published: 2005

133. Results from NA49

Author: Hohne, C., Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Kadija, K., Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Nicolic, V., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., and Zimanyi, J.
Subjects: Physics, Nuclear and High Energy Physics, Range (particle radiation), Particle physics, Large Hadron Collider, Elliptic flow, Hadron, Nuclear Theory, Strangeness production, Spectral line, Nuclear physics, Particle, High Energy Physics::Experiment, Nuclear Physics - Experiment, Nuclear Experiment
Abstract: An overview of results from the CERN experiment NA49 is presented with emphasis on most recent measurements. NA49 has systematically studied the dependence of hadron production on energy and system size or centrality. At top-SPS energy the detailed investigation of hadron production, now also extending to elliptic flow of Lambda-baryons and to identified particle yields at high p_t, shows that the created matter behaves in a similar manner as at RHIC energies. In the lower SPS energy range a distinct structure is observed in the energy dependence of the rate of strangeness production and in the slopes of p_t-spectra suggesting the onset of the creation of a deconfined phase of matter. An overview of results from the CERN experiment NA49 is presented with emphasis on most recent measurements. NA49 has systematically studied the dependence of hadron production on energy and system size or centrality. At top-SPS energy the detailed investigation of hadron production, now also extending to elliptic flow of Lambda-baryons and to identified particle yields at high p_t, shows that the created matter behaves in a similar manner as at RHIC energies. In the lower SPS energy range a distinct structure is observed in the energy dependence of the rate of strangeness production and in the slopes of p_t-spectra suggesting the onset of the creation of a deconfined phase of matter. An overview of results from the CERN experiment NA49 is presented with emphasis on most recent measurements. NA49 has systematically studied the dependence of hadron production on energy and system size or centrality. At top-SPS energy the detailed investigation of hadron production, now also extending to elliptic flow of Λ-baryons and to identified particle yields at high p t , shows that the created matter behaves in a similar manner as at RHIC energies. In the lower SPS energy range a distinct structure is observed in the energy dependence of the rate of strangeness production and in the slopes of p t -spectra suggesting the onset of the creation of a deconfined phase of matter.
Published: 2005

134. NA49 results on hadron production: indications of the onset of deconfinement ?

Author: Lungwitz, Benjamin, Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, J, Betev, L, Bialkowska, H, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csat, P, Dinkelaker, P, Eckardt, V, Flierl, D, Fodor, Z, Foka, P, Friese, V, Gál, J, Gazdzicki, M, Genchev, V, Georgopoulos, G, Gladysz-Dziadus, E, Grebieszkow, K, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kliemant, M, Kniege, S, Kolesnikov, V I, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Laszlo, A, Van Leeuwen, M, Lévai, Peter, Litov, L, Makariev, M, Malakhov, A I, Mateev, M, Melkumov, G L, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Nicolic, V, Pálla, G, Panagiotou, A D, Panayotov, D, Petridis, A, Pikna, M, Prindle, D, Pühlhofer, F, Renfordt, R, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Schmitz, N, Schuster, T, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, G, Stock, R, Strabel, C, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Szymanski, P, Trubnikov, V, Varga, D, Vassiliou, M, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, and Zimányi, J
Subjects: Physics, Large Hadron Collider, Physics::Instrumentation and Detectors, Hadron, Nuclear Theory, FOS: Physical sciences, Deconfinement, Nuclear physics, Particle, High Energy Physics::Experiment, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Size dependence, NA49 experiment
Abstract: The NA49 experiment at the CERN SPS measured the energy and system size dependence of particle production in A+A collisions. A change of the energy dependence of several hadron production properties at low SPS energies is observed which suggests a scenario requiring the onset of deconfinement., Comment: XXXV International Symposium on Multiparticle Dynamics 2005
Published: 2005

135. System-size dependence of strangeness production in nucleus-nucleus collisions at root S-NN=17.3 GeV

Author: Alt, C Anticic, T Baatar, B Barna, D Bartke, J and Betev, L Bialkowska, H Billmeier, A Blume, C Boimska, B and Botje, M Bracinik, J Bramm, R Brun, R Buncic, P and Cerny, V Christakoglou, P Chvala, O Cramer, JG Csato, P and Darmenov, N Dimitrov, A Dinkelaker, P Eckardt, V and Farantatos, G Flierl, D Fodor, Z Foka, P Freund, P and Friese, V Gal, J Gazdzicki, M Georgopoulos, G Gladysz, E and Grebieszkow, K Hegyi, S Hohne, C Kadija, K Karev, A and Kliemant, M Kniege, S Kolesnikov, VI Kollegger, T and Kornas, E Korus, R Kowalski, M Kraus, I Kreps, M van Leeuwen, M Levai, P Litov, L Lungwitz, B Makariev, M and Malakhov, AI Markert, C Mateev, M Mayes, BW Melkumov, GL and Meurer, C Mischke, A Mitrovski, M Molnar, J and Mrowczynski, S Palla, G Panagiotou, AD Panayotov, D and Petridis, A Pikna, M Pinsky, L Puhlhofer, F Reid, JG and Renfordt, R Richard, A Roland, C Roland, G Rybczynski, M and Rybicki, A Sandoval, A Sann, H Schmitz, N Seyboth, P and Sikler, F Sitar, B Skrzypczak, E Stefanek, G Stock, R Strobele, H Susa, T Szentpetery, I Sziklai, J and Trainor, TA Trubnikov, V Varga, D Vassiliou, M Veres, GI and Vesztergombi, G Vranic, D Wetzler, A Wlodarczyk, Z and Yoo, IK Zaranek, J Zimanyi, J
Subjects: Nuclear Theory, Nuclear Experiment
Abstract: Emission of pi(+/-), K+/-, phi, and Lambda was measured in near-central C + C and Si + Si collisions at 158 AGeV beam energy. Together with earlier data for p + p, S + S, and Pb + Pb, the system-size dependence of relative strangeness production in nucleus-nucleus collisions is obtained. Its fast rise and the saturation observed at about 60 participating nucleons can be understood as the onset of the formation of coherent systems of increasing size.
Published: 2005

136. System size and centrality dependence of the balance function in A+A collisions at root S-NN=17.2 GeV

Author: Alt, C Anticic, T Baatar, B Barna, D Bartke, J and Betev, L Bialkowska, H Billmeier, A Blume, C Boimska, B and Botje, M Bracinik, J Bramm, R Brun, R Buncic, P and Cerny, V Christakoglou, P Chvala, O Cramer, JG Csato, P and Darmenov, N Dimitrov, A Dinkelaker, P Eckardt, V and Farantatos, G Flierl, D Fodor, Z Foka, P Freund, P and Friese, V Gal, J Gazdzicki, M Georgopoulos, G Gladysz, E and Grebieszkow, K Hegyi, S Hohne, C Kadija, K Karev, A and Kliemant, M Kniege, S Kolesnikov, VI Kollegger, T and Kornas, E Korus, R Kowalski, M Kraus, I Kreps, M van Leeuwen, M Levai, P Litov, L Lungwitz, B Makariev, M and Malakhov, AI Markert, C Mateev, M Mayes, BW Melkumov, GL and Meurer, C Mischke, A Mitrovski, M Molnar, J and Mrowczynski, S Palla, G Panagiotou, AD Panayotov, D and Petridis, A Pikna, M Pinsky, L Puhlhofer, F Reid, JG and Renfordt, R Richard, A Roland, C Roland, G Rybczynski, M and Rybicki, A Sandoval, A Sann, H Schmitz, N Seyboth, P and Sikler, F Sitar, B Skrzypczak, E Stefanek, G Stock, R Strobele, H Susa, T Szentpetery, I Sziklai, J and Trubnikov, V Varga, D Vassiliou, M Veres, GI and Vesztergombi, G Vranic, D Wetzler, A Wlodarczyk, Z Yoo, IK Zaranek, J Zimanyi, J NA49 Collaboration
Subjects: High Energy Physics::Experiment, Nuclear Experiment
Abstract: Electric charge correlations were studied for p+p, C+C, Si+Si, and centrality selected Pb+Pb collisions at root s(NN) = 17.2 GeV with the NA49 large acceptance detector at the CERN SPS. In particular, long-range pseudorapidity correlations of oppositely charged particles were measured using the balance function method. The width of the balance function decreases with increasing system size and centrality of the reactions. This decrease could be related to an increasing delay of hadronization in central Pb+Pb collisions.
Published: 2005

137. Omega- and anti-Omega+ production in central Pb+Pb collisions at 40 and 158 A GeV

Author: Antičić, Tome, Alt, C., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Billimeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, G., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, Danilo, Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, Nuclear Theory, omega, antiomega, production, Pb+Pb collision, NA49, Nuclear Experiment
Abstract: Results are presented on Omega production in central Pb+Pb collisions at 40 and 158 AGeV beam energy. For the first time in heavy ion reactions, rapidity distributions and total yields were measured for the sum Omega- + anti-Omega+ at 40 AGeV and for Omega- and anti-Omega+ separately at 158 AGeV. The yields are strongly underpredicted by the string-hadronic URQMD model but agree better with predictions from hadron gas model.
Published: 2005

138. High p_T Spectra of Identified Particles Produced in Pb+Pb Collisions at 158GeV/nucleon Beam Energy

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Laszlo, A., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Nicolic, V., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Prindle, D., Puhlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strabel, C., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., and Zimanyi, J.
Subjects: Nuclear and High Energy Physics, Nuclear Theory, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Nuclear Physics
Abstract: Transverse momentum spectra of pi^{+/-}, p, pbar, K^{+/-}, K^0_s and Lambda at midrapidity were measured at high p_T in Pb+Pb collisions at 158GeV/nucleon beam energy by the NA49 experiment. Particle yield ratios (p/pi, K/pi and Lambda/K^0_s) show an enhancement of the baryon/meson ratio for p_T>2GeV/c. The nuclear modification factor R_{CP} is extracted and compared to RHIC measurements and pQCD calculations., Quark Matter 2005 parallel section proceedings
Published: 2005
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139. Multiplicity fluctuations in nuclear collisions at 158A GeV

Author: Rybczynski, M., Alt, C., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, G., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J. G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Nuclear Theory, NA49, multiplicity fluctuation, QGP, CERN, Nuclear Experiment
Abstract: The system size dependence of multiplicity fluctuations of charged particles produced in nuclear collisions at 158 A GeV was studied in the NA49 CERN experiment. The results indicate a non-monotonic dependence of the scaled variance of the multiplicity distribution with a maximum for semi-peripheral Pb+Pb interactions with number of projectile participants of about 35. This effect is not observed in a string-hadronic model of nuclear collision HIJING.
Published: 2005

140. System-size dependence of strangeness production in nucleus-nucleus collisions at $\sqrt{s_{NN}}$ = 17.3 GeV

Author: Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, J, Betev, L, Bialkowska, H, Billmeier, A, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, J G, Csató, P, Darmenov, N, Dimitrov, A, Dinkelaker, P, Eckardt, V, Farantatos, G, Flierl, D, Fodor, Z, Foka, P, Freund, P, Friese, V, Gál, J, Gazdzicki, M, Georgopoulos, G, Gladysz-Dziadus, E, Grebieszkow, K, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kliemant, M, Kniege, S, Kolesnikov, V I, Kollegger, T, Kornas, E, Korus, R, Kowalski, M, Kraus, I, Kreps, M, Van Leeuwen, M, Lévai, Peter, Litov, L, Lungwitz, B, Makariev, M, Malakhov, A I, Markert, C, Mateev, M, Mayes, B W, Melkumov, G L, Meurer, C, Mischke, A, Mitrovski, M, Molnár, J, Mrówczynski, S, Pálla, G, Panagiotou, A D, Panayotov, D, Petridis, A, Pikna, M, Pinsky, L, Pühlhofer, F, Reid, J G, Renfordt, R, Richard, A, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Siklér, F, Sitár, B, Skrzypczak, E, Stefanek, G, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Trainor, T A, Trubnikov, V, Varga, D, Vassiliou, M, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Yoo, I K, Zaranek, J, and Zimányi, J
Subjects: Nuclear Theory, Nuclear Experiment, Particle Physics
Abstract: Emission of $\pi^{\pm}$, $K^{\pm}$, $\phi$, and $\Lambda$ was measured in near-central C + C and Si + Si collisions at 158 AGeV beam energy. Together with earlier data for $p + p$, S + S, and Pb + Pb, the system-size dependence of relative strangeness production in nucleus-nucleus collisions is obtained. Its fast rise and the saturation observed at about 60 participating nucleons can be understood as the onset of the formation of coherent systems of increasing size. copy 2005 The American Physical Society.
Published: 2005

141. System Size and Centrality Dependence of the Balance Function in A + A Collisions at sqrt(sNN) = 17.2 GeV

Author: Alt, C., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Behler, M., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Filip, P., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V. I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Markert, C., Mateev, M., Mayes, B. W., Melkumov, G. L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, S., Palla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J. G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T. A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: High Energy Physics::Lattice, Physics, High Energy Physics::Phenomenology, Nuclear Theory, system size, centrality dependence, balance function, NA49, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Results are presented on event-by-event electric charge fluctuations in central Pb+Pb collisions at 20A, 30A, 40A, 80A, and 158A GeV. The observed fluctuations are close to those expected for a gas of pions correlated by global charge conservation only. These fluctuations are considerably larger than those calculated for an ideal gas of deconfined quarks and gluons. The present measurements do not necessarily exclude reduced fluctuations from a quark-gluon plasma because these might be masked by contributions from resonance decays.
Published: 2005

142. Indications for the Onset of Deconfinement in Pb + Pb Collisions at the CERN SPS from NA49

Author: Alt, C., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, G., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Nuclear Theory, High Energy Physics::Experiment, particle production, energy scan, NA49, CERN, deconfinement, Nuclear Experiment
Abstract: Particle production in central Pb+Pb collisions was studied with the NA49 large acceptance spectrometer at the CERN SPS at the beam energies 20, 30, 40, 80 and 158 GeV per nucleon. A change of the energy dependence is observed around 30A GeV for the yields of pions and strange particles as well as for the shapes of the transverse mass spectra. At present only a reaction scenario with onset of deconfinement is able to reproduce the measurements.
Published: 2005

143. System-size dependence of strangeness production in nucleus-nucleus collisions at sqrt(sNN) = 17.3 GeV

Author: Antičić, Tome, Alt, C., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Billimeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J. G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, G., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V. I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Markert, C., Mateev, M., Mayes, B. W., Melkumov, G. L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Palla, G., Panagiotou, A. D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J. G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T. A., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I. K., Zaranek, J., and Zimanyi, J.
Subjects: strangeness production, system-size dependence, nucleus-nucleus collisions, Physics, Nuclear Theory, Nuclear Experiment
Abstract: Emission of pi, K, phi and Lambda was measured in near-central C+C and Si+Si collisions at 158 AGeV beam energy. Together with earlier data for p+p, S+S and Pb+Pb, the system-size dependence of relative strangeness production in nucleus-nucleus collisions is obtained. Its fast rise and the saturation observed at about 60 participating nucleons can be understood as onset of the formation of coherent partonic subsystems of increasing size.
Published: 2005

144. System size dependence of strange particle yields and spectra at s(NN)**(1/2) = 17.3-GeV

Author: Kraus, I, Alt, C, Anticic, T, Baatar, B, Barna, D, Bartke, J, Betev, L, Białkowska, H, Billmeier, A, Blume, C, Boimska, B, Botje, M, Bracinik, J, Bramm, R, Brun, R, Buncic, P, Cerny, V, Christakoglou, P, Chvala, O, Cramer, JG, Csato, P, Darmenov, N, Dimitrov, A, Dinkelaker, P, Eckardt, V, Flierl, D, Fodor, Z, Foka, P, Freund, P, Friese, V, Gal, J, Gazdzicki, M, Georgopoulos, G, Gładysz, E, Grebieszkow, K, Hegyi, S, Hohne, C, Kadija, K, Karev, A, Kliemant, M, Kniege, S, Kolesnikov, VI, Kollegger, T, Kornas, E, Korus, R, Kowalski, M, Kreps, M, van Leeuwen, M, Levai, P, Litov, L, Lungwitz, B, Makariev, M, Malakhov, Al, Markert, C, Mateev, M, Mayes, BW, Melkumov, GL, Meurer, C, Mischke, A, Mitrovski, M, Molnar, J, Mrowczynski, S, Palla, G, Panagiotou, AD, Panayotov, D, Petridis, A, Pikna, M, Pinsky, L, Puhlhofer, F, Reid, JG, Renfordt, R, Richard, A, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, A, Sann, H, Schmitz, N, Seyboth, P, Sikler, F, Sitar, B, Skrzypczak, E, Stefanek, G, Stock, R, Strobele, H, Susa, T, Szentpetery, I, Sziklai, J, Trainor, TA, Trubnikov, V, Varga, D, Vassiliou, M, Veres, GI, Vesztergombi, G, Vranic, D, Wetzler, A, Włodarczyk, Z, Yoo, IK, Zaranek, J, and Zimanyi, J
Published: 2005

145. Omega(-) and (Omega)over-bar(+) production in central Pb+Pb collisions at 40 and 158A GeV

Author: Alt, C Anticic, T Baatar, B Barna, D Bartke, J and Betev, L Bialkowska, H Billmeier, A Blume, C Boimska, B and Botje, M Bracinik, J Bramm, R Brun, R Buncic, P and Cerny, V Christakoglou, P Chvala, O Cramer, JG Csato, P and Darmenov, N Dimitrov, A Dinkelaker, P Eckardt, V and Farantatos, G Flierl, D Fodor, Z Foka, P Freund, P and Friese, V Gal, J Gazdzicki, M Georgopoulos, G Gladysz, E and Grebieszkow, K Hegyi, S Hohne, C Kadija, K Karev, A and Kliemant, M Kniege, S Kolesnikov, VI Kollegger, T and Kornas, E Korus, R Kowalski, M Kraus, I Kreps, M van Leeuwen, M Levai, P Litov, L Lungwitz, B Makariev, M and Malakhov, AI Markert, C Mateev, M Mayes, BW Melkumov, GL and Meurer, C Mischke, A Mitrovski, M Molnar, J and Mrowczynski, S Palla, G Panagiotou, AD Panayotov, D and Petridis, A Pikna, M Pinsky, L Puhlhofer, F Reid, JG and Renfordt, R Richard, A Roland, C Roland, G Rybczynski, M and Rybicki, A Sandoval, A Sann, H Schmitz, N Seyboth, P and Sikler, F Sitar, B Skrzypczak, E Stefanek, G Stock, R Strobele, H Susa, T Szentpetery, I Sziklai, J and Trainor, TA Varga, D Vassiliou, M Veres, GI and Vesztergombi, G Vranic, D Wetzler, A Wlodarczyk, Z Yoo, IK Zaranek, J Zimanyi, J NA49 Collaboration
Subjects: High Energy Physics::Phenomenology, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Results are presented on Omega production in central Pb+Pb collisions at 40 and 158A GeV beam energy. For the first time in heavy ion reactions, rapidity distributions and total yields were measured for the sum Omega(-)+(Omega) over bar (+) at 40A GeV and for Omega(-) and (Omega) over bar (+) separately at 158A GeV. The yields are strongly underpredicted by the string-hadronic UrQMD model but agree better with predictions from hadron gas models.
Published: 2005

146. Indications for the onset of deconfinement in nucleus nucleus collisions

Author: Flierl, D., Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Białkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J G., Csató, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Fodor, Z., Foka, P., Freund, P., Friese, V., Gál, J., Gazdzicki, M., Georgopoulos, G., Gładysz, E., Grebieszkow, K., Hegyi, S., Höhne, C., Kadija, K., Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Lévai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnár, J., Mrówczynski, S., Pálla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, L., Pühlhofer, F., Reid, J.G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Siklér, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Ströbele, H., Susa, T., Szentpétery, I., Sziklai, J., Trainor, T.A., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Włodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, Range (particle radiation), Large Hadron Collider, 010308 nuclear & particles physics, Hadron, Nuclear Theory, FOS: Physical sciences, Nuclear matter, 7. Clean energy, 01 natural sciences, Deconfinement, Nuclear physics, medicine.anatomical_structure, Pion, 0103 physical sciences, medicine, Transverse mass, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), 010306 general physics, Nuclear Experiment, Nucleus, Nuclear Physics
Abstract: The hadronic final state of central Pb+Pb collisions at 20, 30, 40, 80, and 158 AGeV has been measured by the CERN NA49 collaboration. The mean transverse mass of pions and kaons at midrapidity stays nearly constant in this energy range, whereas at lower energies, at the AGS, a steep increase with beam energy was measured. Compared to p+p collisions as well as to model calculations, anomalies in the energy dependence of pion and kaon production at lower SPS energies are observed. These findings can be explained, assuming that the energy density reached in central A+A collisions at lower SPS energies is sufficient to transform the hot and dense nuclear matter into a deconfined phase., 6 pages, 8 Figures, proceedings of the ICHEP2004 conference
Published: 2004

147. $\Omega$ and $\bar{\Omega}$ production in central Pb+Pb collisions at 40 and 158 AGeV

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, G., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V.I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Nuclear Theory, High Energy Physics::Experiment, Nuclear Experiment, Nuclear Physics
Abstract: Results are presented on $\Omega$ production in central Pb+Pb collisions at 40 and 158A GeV beam energy. Given are transverse-mass spectra, rapidity distributions, and total yields for the sum $\Omega$+$\bar{\Omega}$ at 40 AGeV and for $\Omega$ and $\bar{\Omega}$ separately at 158 AGeV. The yields are strongly under-predicted by the string-hadronic UrQMD model and agree with predictions from a hadron gas model assuming strangeness under-saturation. Results are presented on Omega production in central Pb+Pb collisions at 40 and 158 AGeV beam energy. Given are transverse-mass spectra, rapidity distributions, and total yields for the sum Omega+Antiomega at 40 AGeV and for Omega and Antiomega separately at 158 AGeV. The yields are strongly under-predicted by the string-hadronic UrQMD model and are in better agreement with predictions from a hadron gas models.
Published: 2004

148. Three-dimensional two-pion source image from [formula omitted] collisions at [formula omitted]: New constraints for source breakup dynamics

Author: Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Białkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bunćić, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J.G., Csató, P., Dinkelaker, P., Eckardt, V., Flierl, D., Fodor, Z., Foka, P., Friese, V., Gál, J., Gaździcki, M., Genchev, V., Gładysz, E., Grebieszkow, K., Hegyi, S., Höhne, C., Kadija, K., Karev, A., Kniege, S., Kolesnikov, V.I., Korus, R., Kowalski, M., Kreps, M., Laszlo, A., Lacey, R., van Leeuwen, M., Lévai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Mateev, M., Melkumov, G.L., Mitrovski, M., Molnár, J., Mrówczyński, St., Nicolic, V., Pálla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Peryt, W., Pikna, M., Pluta, J., Prindle, D., Pühlhofer, F., Renfordt, R., Roland, C., Roland, G., Rybczyński, M., Rybicki, A., Sandoval, A., Schmitz, N., Schuster, T., Seyboth, P., Siklér, F., Sitar, B., Skrzypczak, E., Slodkowski, M., Stefanek, G., Stock, R., Ströbele, H., Susa, T., Szentpétery, I., Sziklai, J., Szuba, M., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, D., Włodarczyk, Z., Wojtaszek, A., Yoo, I.K., Alexander, J.M., Danielewicz, P., Kisiel, A., and Pratt, S.
Published: 2010
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149. Lambda and Antiambda production in central Pb-Pb collisions at 40, 80, and 158A GeV

Author: Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Behler, M., Betev, L., Bialkowska, H., Billimeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Filip, P., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kolesnikov, V.I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Levai, P., Litov, L., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Palla, G., Panagiotou, A.D., Panayotov, D., Perl, K., Petridis, A., Pikna, M., Pinsky, L., Puhlhofer, F., Reid, J.G., Renfordt, R., Retyk, W., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranić, Danilo, Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, lambda, antilambda, strange particle, production, Pb+Pb collsions, NA49, High Energy Physics::Experiment, Nuclear Experiment
Abstract: Production of Lambda and Antilambda hyperons was measured in central Pb-Pb collisions at 40, 80, and 158 A GeV beam energy on a fixed target. Transverse mass spectra and rapidity distributions are given for all three energies. The Lambda/pi ratio at mid-rapidity and in full phase space shows a pronounced maximum between the highest AGS and 40 A GeV SPS energies, whereas the Antilambda/pi ratio exhibits a monotonic increase.
Published: 2004

150. Rapidity and transverse momentum dependence of pion-pion Bose-Einstein correlations measured at 20, 30, 40, 80, and 158 AGeV beam energy

Author: Kniege, S., Alt, C., Anticic, T., Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Billmeier, A., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bramm, R., Brun, R., Buncic, P., Cerny, V., Christakoglou, P., Chvala, O., Cramer, J.G., Csato, P., Darmenov, N., Dimitrov, A., Dinkelaker, P., Eckardt, V., Farantatos, G., Filip, P., Flierl, D., Fodor, Z., Foka, P., Freund, P., Friese, V., Gal, J., Gazdzicki, M., Georgopoulos, G., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kliemant, M., Kolesnikov, V.I., Kollegger, T., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., van Leeuwen, M., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A.I., Markert, C., Mateev, M., Mayes, B.W., Melkumov, G.L., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Palla, G., Panagiotou, A.D., Panayotov, D., Petridis, A., Pikna, M., Pinsky, Lawrence S., Puhlhofer, F., Reid, J.G., Renfordt, R., Richard, A., Roland, C., Roland, G., Rybczynski, M., Rybicki, A., Sandoval, A., Sann, H., Schmitz, N., Seyboth, P., Sikler, F., Sitar, B., Skrzypczak, E., Stefanek, G., Stock, R., Strobele, H., Susa, T., Szentpetery, I., Sziklai, J., Trainor, T.A., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Yoo, I.K., Zaranek, J., and Zimanyi, J.
Subjects: Physics, Nuclear and High Energy Physics, Nuclear Theory, FOS: Physical sciences, Bose–Einstein correlations, Radius, Nuclear physics, Pion, Transverse momentum, Rapidity, Nuclear Experiment (nucl-ex), Nuclear Experiment, Beam energy, NA49 experiment, Energy (signal processing), Nuclear Physics
Abstract: Preliminary results on pion-pion Bose-Einstein correlations in central Pb+Pb collisions measured by the NA49 experiment are presented. Rapidity as well as transverse momentum dependence of the HBT-radii are shown for collisions at 20, 30, 40, 80, and 158 AGeV beam energy. Including results from AGS and RHIC experiments only a weak energy dependence of the radii is observed. Based on hydrodynamical models parameters like lifetime and geometrical radius of the source are derived from the dependence of the radii on transverse momentum., 5 pages, 4 figures, contribution to the Quark Matter conference, Oakland, USA, Jan 11-17, 2004
Published: 2004

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