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1. Energy dependence of phi meson production in central Pb+Pb collisions at sqrt(s_nn) = 6 to 17 GeV

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., Galadysz, E., Grebieszkow, K., Hegyi, S., Hoehne, 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., 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., Seyboth, P., 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., Walodarczyk, Z., Yoo, I. K., and Zimanyi, J.

Subjects
Nuclear Experiment
Abstract

Phi 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 to 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., Comment: 18 pages, 12 figures, 6 tables

Published
2008
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2. Event-by-event transverse momentum fluctuations in nuclear collisions at CERN SPS

Author

Grebieszkow, K., 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., 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., and Zimányi, J.

Subjects
Nuclear Experiment
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

4. Capturing CO2 by ceria and ceria–zirconia nanomaterials of different origin.

Author

Panayotov, D., Zdravkova, V., Lagunov, O., Andonova, S., Spassova, I., Nihtianova, D., Atanasova, G., Drenchev, N., Ivanova, E., Mihaylov, M., and Hadjiivanov, K.

Abstract

Ceria and ceria–zirconia nanomaterials of different origin were studied in order to elucidate the role of their structural and textural characteristics in controlling the performance towards CO2 capture. Two commercial cerias and two home-prepared samples, CeO2 and CeO2–ZrO2 (75% CeO2) mixed oxide, were investigated. The samples were characterized by a number of analytical techniques including XRD, TEM, N2-adsorption, XPS, H2-TPR, Raman and FTIR spectroscopy. Static and dynamic CO2 adsorption experiments were applied to assess the CO2 capture performance. The type of surface species formed and their thermal stability were evaluated by in situ FTIR spectroscopy and CO2–TPD analysis. The two commercial ceria samples possessed similar structural and textural characteristics, formed the same types of carbonate-like surface species upon CO2 adsorption and, consequently, demonstrated almost identical CO2 capture performance under both static and dynamic conditions. The thermal stability of the adsorbed species increased in the order bidentate (B) carbonates, hydrogen carbonates (HC) and tridentate carbonates (T-III, T-II, T-I). Reduction of CeO2 increased the relative amount of the most strongly bonded T-I tridentate carbonates. Preadsorbed water led to hydroxylation and enhanced formation of hydrogen carbonates. Although the synthesized CeO2 sample had a higher surface area (by 30%) it showed a disadvantageous long mass transfer zone in the CO2-adsorption breakthrough curves. Because of its complex pore structure, this sample probably experiences severe intraparticle CO2 diffusion resistance. Having the same surface area as the synthesized CeO2, the mixed CeO2–ZrO2 oxide exhibited the highest CO2 capture capacity of 136 μmol g−1 under dynamic conditions. This was related to the highest concentration of CO2 adsorption sites (including defects) on this sample. The CeO2–ZrO2 system showed the lowest sensitivity to the presence of water vapor in the gas stream due to the lack of dissociative water adsorption on this material. [ABSTRACT FROM AUTHOR]

Published
2023
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5. Recent Results from the NA49 Experiment

Author

Blume, C., Botje, M., van Leeuwen, M., Christakoglou, P., Georgopoulos, G., Panagiotou, A. D., Vassiliou, M., Petridis, A., Pikna, M., Cerny, V., Bracinik, J., Kreps, M., Sitar, B., Barna, D., Csato, P., Fodor, Z., Gal, J., Hegyi, S., Levai, P., Molnar, J., Palla, G., Siklér, F., Varga, D., Szentpetery, I., Veres, G. I., Zimanyi, J., Vesztergombi, G., Sziklai, J., Roland, C., Roland, G., Bartke, J., Gladysz, E., Kornas, E., Kowalski, M., Rybicki, A., Kraus, I., Foka, P., Friese, V., Markert, C., Mischke, A., Sandoval, A., Sann, H., Vranic, D., Baatar, B., Malakhov, A. I., Kolesnikov, V. I., Melkumov, G. L., Kollegger, T., Meurer, C., Betev, L., Billmeier, A., Bramm, R., Dinkelaker, P., Flierl, D., Gazdzicki, M., Mitrovski, M., Stock, R., Ströbele, H., Zaranek, J., Wetzler, A., Renfordt, R., Buncic, P., Brun, R., Fischer, H. G., Wenig, S., Mayes, B. W., Pinsky, L., Korus, R., Mrowczynski, St., Rybczynski, M., Stefanek, G., Wlodarczyk, Z., Behler, M., Höhne, C., Pühlhofer, F., Eckardt, V., Filip, P., Freund, P., Karev, A., Schmitz, N., Seyboth, P., Chvala, O., Yoo, I. K., Cramer, J. G., Reid, J. G., Trainor, T. A., Darmenov, N., Dimitrov, A., Litov, L., Makariev, M., Mateev, M., Panayotov, D., Bialkowska, H., Boimska, B., Perl, K., Retyk, W., Skrzypczak, E., Susa, T., Anticic, T., Kadija, K., Greiner, Walter, editor, Itkis, Mikhail G., editor, Reinhardt, Joachim, editor, and Güçlü, Mehmet Cem, editor

Published
2004
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8. Capture of CO2 by CeO2 Materials of Different Origin and CeO2(75%)ZrO2(25%)

Author

Zdravkova, V., Lagunov, O., Andonova, S., Spassova, I., Ivanova, E., Mihaylov, M., Panayotov, D., and Hadjiivanov, K.

Subjects
FTIR spectroscopy, static and dynamic adsorption, ceria materials, CO2 capture
Abstract

Capturing carbon dioxide from large CO2 emission sources, like power plants and steel mills, is technologically the first important stage of the CCS and CCU approaches aimed at mitigating the global warming. Nowadays, separation of CO2 using liquid sorbents such as amine liquids is a mainstream CO2 capture technology. This separation technique utilizes the temperature dependence of CO2 sorption. Namely, the separation involves cycling between CO2 absorption from exhaust gas at low temperature and CO2 desorption at high temperature. Alternatively, CO2 can be separated by solid materials such as adsorbents and membranes. One of the advantages of solid sorbents as compared to liquid solvents is their smaller specific heat capacity. This allows decreasing the required heat for CO2 recovering and thus lowering the energy consumption for CO2 separation. In this regard, solid-based CO2 adsorbents have attracted a great deal of research efforts. There are many reports on adsorbents using zeolites, metal organic frameworks, amine-grafted silica, carbon-based materials and metal oxides. The investigated metal oxides include cerium oxide, iron oxide, lithium oxide, magnesium oxide, aluminium oxide, titanium oxide, and zirconium oxide. CeO2 is shown to exhibit one of the highest numbers of surface basic sites among a number of selected metal oxides, which is advantageous in terms of CO2 capture. Mesoporous CeO2 is shown to exhibit a significant CO2 adsorption capacity. In addition, the presence of metal dopants was found to further tune the surface functionalities, such as the surface acid–base properties and defect sites, which impact the adsorption behaviour of CO2 on the CeO2 surface. This work studies CeO2 and CeO2-ZrO2 adsorbent materials with different origin. Two of them were commercial nanoparticulate CeO2 powders obtained from two different suppliers, Alfa Aesar and US Research Nanomaterials. Both samples have comparable nanoparticle size and specific surface area. The third CeO2 nanoparticulate sample was prepared in our lab by precipitation with ammonia from of a Ce(NO3)3.6H2O aqueous solution. The fourth nanoparticulate material was CeO2(75%)ZrO2(25%) obtained via co-precipitation with ammonia from of a mixed aqueous solution of Ce(NO3)3.6H2O and ZrO(NO3)2.xH2O. The physicochemical characteristics of the studied samples are reported elsewhere. The CO2 adsorption capacity was measured for both the static and dynamic CO2 adsorption regimes. The chemisorption of CO2 forming different surface species was studied by FTIR spectroscopy. The thermal stability of surface CO2-related species was also studied for the oxygen-activated, H2-reduced and water-covered adsorbents. The FTIR spectroscopy data showed the presence of bridge, hydrogen, mono and bidentate carbonate, as well as polydentate carbonate CO2 surface species. The relative population of these species is almost identical for the commercial CeO2 samples, while for the precipitation prepared samples the coverage of more strongly bonded bi- and polydentate carbonate species is prevailing. Moreover, the CeO2(75%)ZrO2(25%) sample showed almost no indication to loose its CO2 capacity when the surface is pre-covered with water, as was the case with the commercial samples. The results of this study showed that the synthesized CeO2(75%)ZrO2(25%) is a material with promising potential for CO2 capture applications.

Published
2021

9. 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., Buncić, 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., and The NA Collaboration

Published
2007
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10. The HARP detector at the CERN PS

Author

Catanesi, M.G., Muciaccia, M.T., Radicioni, E., Simone, S., Edgecock, R., Ellis, M., Robbins, S., Soler, F.J.P., Gößling, C., Mass, M., Bunyatov, S., Chukanov, A., Klimov, O., Krasin, I., Krasnoperov, A., Kustov, D., Popov, B., Serdiouk, V., Tereshchenko, V., Carassiti, V., Di Capua, E., Evangelisti, F., Vidal-Sitjes, G., Artamonov, A., Arce, P., Brocard, R., Decreuse, G., Friend, B., Giani, S., Gilardoni, S., Gorbunov, P., Grant, A., Grossheim, A., Gruber, P., Ivanchenko, V., Legrand, J.-C., Kayis-Topaksu, A., Panman, J., Papadopoulos, I., Pasternak, J., Tcherniaev, E., Tsukerman, I., van der Vlugt, R., Veenhof, R., Wiebusch, C., Zucchelli, P., Blondel, A., Borghi, S., Campanelli, M., Cervera-Villanueva, A., Morone, M.C., Prior, G., Schroeter, R., Kato, I., Gastaldi, U., Mills, G.B., Graulich, J.S., Grégoire, G., Bonesini, M., Chignoli, F., Ferri, F., Paleari, F., Kirsanov, M., Postoev, V., Bagulya, A., Grichine, V., Polukhina, N., Palladino, V., Coney, L., Schmitz, D., Barr, G., De Santo, A., Pattison, C., Zuber, K., Barichello, G., Bobisut, F., Gibin, D., Guglielmi, A., Laveder, M., Menegolli, A., Mezzetto, M., Pepato, A., Dumarchez, J., Troquereau, S., Vannucci, F., Dore, U., Iaciofano, A., Lobello, M., Marinilli, F., Orestano, D., Panayotov, D., Pasquali, M., Pastore, F., Tonazzo, A., Tortora, L., Booth, C., Buttar, C., Hodgson, P., Howlett, L., Nicholson, R., Bogomilov, M., Burin, K., Chizhov, M., Kolev, D., Petev, P., Rusinov, I., Tsenov, R., Piperov, S., Temnikov, P., Apollonio, M., Chimenti, P., Giannini, G., Santin, G., Burguet-Castell, J., Gómez-Cadenas, J.J., Novella, P., Sorel, M., and Tornero, A.

Published
2007
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11. Light-induced charge separation in anatase TiO2 particles

Author

Berger, T., Sterrer, M., Diwald, O., Knozinger, E., Panayotov, D., and Thompson, T.L.

Subjects
Oxides -- Electric properties, Oxides -- Magnetic properties, Infrared spectroscopy -- Research, Electron paramagnetic resonance spectroscopy -- Research, Titanium compounds -- Electric properties, Titanium compounds -- Magnetic properties, Chemicals, plastics and rubber industries
Abstract

A study of ultraviolet light-induced electron-hole excitations in anatase TiO2 powders is presented by a combination of electron paramagnetic resonance and infrared spectroscopy measurements. It is concluded that under high vacuum conditions, the major fraction of photoexcited electrons remains in the conduction band.

Published
2005

12. Infestation with protostrongylids of the Balkan chamois (Rupicapra rupicapra balcanica, Bolkey 1925) in Rila National Park, Bulgaria: preliminary data.

Author

Yankov, Y., Georgiev, D., Iliev, P., Tonev, A., Arangelov, S., Valchev, K., Panayotov, D., and Peeva, S.

Subjects
NATIONAL parks & reserves, SAMPLING (Process), FLOTATION, SEDIMENTATION & deposition
Abstract

A total of 109 fecal samples were collected from May to September, 2020 in the area of Rila National Park, Bulgaria. The samples were processed by flotation technique using saturated sodium chloride (sp. gr. 1.20), routine sedimentation method, Baermann's method and larval cultivation. In a total of 59 samples (54.12%) representatives of the family Protostrongylidae were found. The larvae found belong to four genera. The predominant infestations were with Muellerius spp. presented in 35.78% of the studied samples followed by Cystocaulus spp. - in 34.86%, respectively. The genus Protostrongylus was present in 7.34% of the samples, and Neostrongylus - 3.67%. Research on protostrongylid infestation of the Balkan chamois in the area of Rila National Park was carried out for the first time in Bulgaria. [ABSTRACT FROM AUTHOR]

Published
2022

17. Summary of the 2nd International Workshop on Environmental, Safety and Economic Aspects of Fusion Power

Author

Wu, Y., Chen, Z., Meng, Z., Hu, L., Gonzalez de Vicente, S.M., Merrill, B., Panayotov, D., Zucchetti, M., Kolbasov, B., van Houtte, D., Bustreo, C., Kim, Y., Kim, K., Maisonnier, D., Clark, D., Kalashnikov, A., and Sakamoto, Yoshiteru

Abstract

The 2nd International Workshop on Environmental, Safety and Economic Aspects of Fusion Power (ESEFP) was held on 23 September 2017 in Kyoto, Japan. The workshop was initiated by the International Energy Agency Technology Collaboration Program on ESEFP. The workshop was well attended with approximately forty participants representing fifteen institutions in eight countries. The presentations covered safety issues and environmental impacts, availability improvement and risk control and socio-economic aspects of fusion power. Quantitative safety assessment of fusion reactors was discussed in depth with the consensus output presented as a plenary presentation at the 13th International Symposium on Fusion Nuclear Technology (ISFNT-13). The next workshop is planned to be held in conjunction with the ISFNT-14 in 2019.

Published
2019

18. Summary of the 2nd International Workshop on Environmental, Safety and Economic Aspects of Fusion Power

Author

Wu, Y., primary, Chen, Z., additional, Meng, Z., additional, Hu, L., additional, Gonzalez de Vicente, S.M., additional, Merrill, B., additional, Panayotov, D., additional, Zucchetti, M., additional, Kolbasov, B., additional, van Houtte, D., additional, Bustreo, C., additional, Kim, Y., additional, Sakamoto, Y., additional, Kim, K., additional, Maisonnier, D., additional, Clark, D., additional, Kalashnikov, A., additional, and Subbotin, M., additional

Published
2018
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22. Amino acid composition of lamb meat from the North East Bulgarian fine fleece breed and its crossbreds from internal breeding

Author

Slavov, R., Mihaylova, G., Ribarski, S., Panayotov, D., Pamukova, D., and Dragnev, D.

Subjects
amino acid content of meat, meat, crossing, lambs, internal breeding, amino acid index of mea
Abstract

A comparative analysis of amino acid composition of lamb meat from the North East Bulgarian fine fleece breed (I gr.) and its crossbreds from internal breeding with 25% heredity from the Australian merino (II gr.) and Ile de France (III gr.) breeds was conducted. Upon starting the experiment lambs were equal and during the experiment they were placed under similar conditions of feeding and rearing. To establish the amino acid composition of meat slaughter analyses were performed at 100 and 130 days of age. From the carcass of each slaughtered animal individual mean samples were taken. Studies were carried out in the Research Laboratory of the Faculty of Agriculture at Trakia University. As a result of the studies the following conclusions were made: 1⁄4 Ile de France crossbreds in a sophisticated crossing have the highest total amino acid content, including essential amino acids in the meat of 100- and 130-day-old lambs, 6.87% and 7.36%, respectively. The lysine/arginine ratio, relating to protein atherogenicity, varies within narrow ranges among groups and marks slight increase with age – from 1.31-1.37 at 100 days to 1.41-1.46 at 130 days. With the increase of age in crossbreds from internal breeding total protein amino acid content grows, that being most prominent in lambs from the III group – from 41.92 to 43.49%. The values of total protein indices increase compared to the reference protein (from 117.97% to 118.22% for II group and from 116.44% to 120.80% for III group) and the whole egg protein (from 89.39% to 91.92% for II group and from 90.53% to 93.93 for III group). It has been found that internal breeding of crossbreds with 25% heredity from the Ile de France breed has positive effect concerning the total amino acid content of lamb meat at 100 and 130 days of age, essential amino acid content in it and the levels of total amino acid indices. Internal breeding of crossbreds with 25% heredity from the Australian merino breed does not have an adverse effect on the levels of the studied traits.

Published
2016

24. Molecular diffusion and photooxidation chemistry on TiO2 surfaces under perfluoroalkane layers

Author

Panayotov, D. and Yates, J.T., Jr.

Subjects
Photochemistry -- Research, Organic compounds -- Research, Organic compounds -- Properties, Infrared spectroscopy -- Research, Chemicals, plastics and rubber industries
Abstract

The transmission infrared spectroscopy is used to analyze the photooxidation of an organic compound, 2-chloroethyl ethyl sulfide (2-CEES), over a TiO2-SiO2 mixed oxide photocatalyst for determining the influence of an inert perfluoroalkane (C9F20) buffer layer on the photooxidation properties of the photocatalyst. The study revealed that adsorption of 2-CEES and O2 occurs at the photocatalyst surface, and photooxidation of the 2-CEES is little impeded by the inert C9F20 layer.

Published
2004

25. Summary of the 1st International Workshop on Environmental, Safety and Economic Aspects of Fusion Power

Author

Wu, Y., primary, Stevens, E., additional, Kim, K., additional, Maisonnier, D., additional, Kalashnikov, A., additional, Tobita, K., additional, Jackson, D., additional, Alejaldre, C., additional, Perrault, D., additional, Panayotov, D., additional, Merrill, B., additional, Grisolia, C., additional, Zucchetti, M., additional, Pinna, T., additional, van Houtte, D., additional, Konishi, S., additional, and Kolbasov, B., additional

Published
2016
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28. Energy dependence of fluctuations in central Pb+Pb collisions from NA49 at the CERN SPS

Author

Rybczynski, M., 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., 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., 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., Utvic, M., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wetzler, A., Wlodarczyk, Z., Wojtaszek, A., Yoo, I.K., and Zimanyi, J.

Subjects
Physics, Nuclear and High Energy Physics, Large Hadron Collider, FOS: Physical sciences, Collision, Critical point (mathematics), Nuclear physics, Transverse momentum, Nuclear Physics - Experiment, Multiplicity (chemistry), Nuclear Experiment (nucl-ex), Nuclear Experiment, Multiplicity distribution
Abstract

The latest NA49 results on fluctuations of multiplicity and average transverse-momentum analyzed on an event-by-event basis are presented for central Pb+Pb interactions over the whole SPS energy range (20A - 158A GeV). The scaled variance of the multiplicity distribution decreases with collision energy whereas the $\Phi_{p_{T}}$ measure of $$ fluctuations is small and independent of collision energy. Thus in central Pb+Pb collisions these fluctuations do not show an indication of the critical point of strongly interacting matter., Comment: 5 pages, 4 figures, talk presented at Quark Matter 2008 Reference added and some typos corrected

Published
2012

29. High Transverse Momentum Hadron Spectra at $\sqrt{s_{NN}}=17.3$ GeV, in Pb+Pb and p+p Collisions, Measured by CERN-NA49

Author

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, 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, M, Veres, G I, Vesztergombi, G, Vranic, D, Wetzler, A, Wlodarczyk, Z, Wojtaszek, A, Yoo, I K, and Zimányi, J

Subjects
Nuclear Physics - Experiment, Nuclear Experiment
Abstract

Transverse momentum spectra up to 4.5 GeV/c around midrapidity of $\pi^{\pm}, p, pbar, K^{\pm}$ in Pb+Pb reactions were measured at $\sqrt{s_{NN}}=17.3$ GeV by the CERN-NA49 experiment. The nuclear modification factors $R_{AA}$ and $R_{CP}$ were extracted and are compared to RHIC results at $\sqrt{s_{NN}}=200$ 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 $\pi^{\pm}$ channel. The extracted $R_{CP}$ values follow the 200 GeV RHIC results closely in the available transverse momentum range, except for $\pi^{\pm}$ above 2.5 GeV/c transverse momentum. There the measured suppression is smaller than that observed at RHIC.

Published
2012

30. Study of milk composition in sheep of Pleven black head breed

Author

Panayotov, D., Iliev, T., Naydenova, N., Pamukova, D., and Simeonov, M.

Subjects
milk composition, line, rams, sheep milk, somatic cells
Abstract

The aim of the study was to investigate somatic cell count and milk composition from Pleven Black head breed of sheep. A total of 96 ewes on first lactation were used belonging to the flock of the village of Komarevo, Pleven district. The studied animals – daughters of six rams from 2 lines, were fed year round in a barn (November-March) and pasture period (April-October). A total of 384 individual milk samples were taken at four selection controls. The milk composition – fat, protein, casei, lactose, solids-non-fat and dry matter was established by Milko-Skan 104 (A/S Foss Elektric, Denmark). The total number of the somatic cells was established by an Ekoscope SCC automated system (Bulteh 2000, Stara Zagora, Bulgaria). The results of this investigation showed that the studied animals had very good milk quality indices. The milk of line 522 animals had significantly higher dry matter, solids-non-fat, fat, protein, casein and lactose content in comparison to those of line 32. For all studied milk indicators the daughters of ram No.33 in line 32 showed the highest average values whereas those of ram No.321 belonging to the same line had the lowest. The average somatic cell count of the milk in the studied animals was very low – 66 254 cells/ml. Minimum variation was established in respect to average SCC values of the milk in both lines but very large between the individual rams.

Published
2011

31. Three-dimensional two-pion source image from Pb +Pb collisions at √sNN = 17.3 GeV : New constraints for source breakup dynamics

Author

Alt, C., Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bunčić, Predrag, 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., Kniege, S., Kolesnikov, V. I., Korus, R., Kowalski, M., 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., Mitrovski, M., Molnar, J., Mrowczynski, St., Nikolić, Vedran, 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, Danilo, Wlodarczyk, Z., Wojtaszek, A., Yoo, I. K., Alexanders, J. M., Danielewicz, P., Kisiel, A., and Pratt, S.

Subjects
Physics, Nuclear Theory, Physics::Accelerator Physics, CERN, SPS, NA49, source imaging, pions, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Source imaging methodology is used to provide a three-dimensional two-pion source function for midrapidity pion pairs with pT < 70 MeV/c in central (0–7%) Pb + Pb collisions at √sNN = 17.3 GeV. Prominent non-Gaussian tails are observed in the pion pair transverse momentum (outward) and in the beam (longitudinal) directions. Model calculations reproduce them with the assumption of Bjorken longitudinal boost invariance and transverse flow blast-wave dynamics ; they also yield a proper time for breakup and emission duration for the pion source.

Published
2010

33. Status and further Analysis Plans of the NA49 Collaboration

Author

Anticic, T, Baatar, B, Barna, D, Bartke, J, Beck, H, Betev, L, Bialkowska, H, Blume, C, Boimska, B, Book, J, Botje, M, Bracinik, J, Buncic, P, Cerny, V, Christakoglou, P, Chung, P, Chvala, O, Cramer, J G, Csató, P, Dinkelaker, P, Eckardt, V, Fischer, H G, Fodor, Z, Foka, P, Friese, V, Gál, J, Gazdzicki, M, Genchev, V, Grebieszkow, K, Hegyi, S, Höhne, C, Kadija, K, Karev, A, Kolesnikov, V I, Kowalski, M, Kreps, M, Laszlo, A, Lacey, R, Van Leeuwen, M, Lévai, Peter, Litov, L, Makariev, M, Malakhov, A I, Mateev, M, Mackowiak, M, Melkumov, G L, Mitrovski, M, Molnár, J, Mrówczynski, St, Nicolic, V, Pálla, G, Panagiotou, A D, Panayotov, D, 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, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Szuba, M, Szymanski, P, Utvic, M, Varga, D, Vassiliou, M, Veres, G I, Vesztergombi, G, Vranic, D, Wenig, S, Wlodarczyk, Z, and Wojtaszek, A

Subjects
Detectors and Experimental Techniques
Abstract

Status and further Analysis Plans of the NA49 Collaboration

Published
2009

34. System-size dependence of $\Lambda$ and $\Xi$ production in nucleus-nucleus collisions at 40A and 158A GeV measured at the CERN Super Proton Synchrotron

Author

Anticic, T., Baatar, B., Barna, D., Bartke, J., Beck, H., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Book, J., Botje, M., Bracinik, J., Buncic, P., Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J.G., Csato, P., Dinkelaker, P., Eckardt, V., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Gladysz, E., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, K., Karev, A., Kresan, D., Kolesnikov, V.I., 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., 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., Utvic, M., Varga, D., Vassiliou, M., Veres, G.I., Vesztergombi, G., Vranic, D., Wlodarczyk, Z., Wojtaszek, A., and Yoo, I.K.

Subjects
FOS: Physical sciences, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Results on Lambda, Anti-lambda, and Xi- production in centrality selected Pb+Pb reactions at 40A and 158A GeV and in near-central C+C and Si+Si reactions at 158A GeV are presented. Transverse mass spectra, rapidity spectra, and multiplicities in dependence of the system size are discussed. Comparisons to transport models (UrQMD2.3 and HSD) and to the core-corona approach are performed. While Lambda and Anti-lambda production can be described by transport models reasonably well, these models do not agree with the Xi- measurements. On the other hand, the core-corona picture fits very well the system-size dependence of Lambda and Xi-, while it agrees less well with the Anti-lambda data., 13 pages, 12 figures. Revised version as accepted by Phys. Rev. C

Published
2009

35. Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from sqrt(sNN)=6.3 to 17.3 GeV

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., Hohne, C., Kadija, Krešo, Karev, A., Kliemant, M., Kniege, S., Kolesnikov, V. I., Kornas, E., Korus, R., Kowalski, M., Kraus, I., Kreps, M., Kresan, D., 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., 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., Strobele, H., Šuša, Tatjana, Szentpetery, I., Sziklai, J., Szymanski, P., Trubnikov, V., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, Danilo, Wetzler, A., Wlodarczyk, Z., and Yoo, I. K.

Subjects
NA49, SPS, fluctuation, particle ratio, energy dependence, Physics, Nuclear Experiment
Abstract

We present measurements of the energy dependence of event-by-event fluctuations in the K/pi and (p+ anti-p)/pi multiplicity ratios in heavy-ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central Pb+Pb collisions at five collision energies, sqrt(sNN), between 6.3 and 17.3 GeV. After accounting for the effects of finite-number statistics and detector resolution, we extract the strength of nonstatistical fluctuations at each energy. For the K/pi ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the (p+anti-p)/pi ratio are smaller than expectations from independent particle production, indicating correlated pion and proton production from resonance decays. For both ratios, the deviation from purely statistical fluctuations shows an increase toward lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the K/pi ratio fluctuations.

Published
2009

36. System-size dependence of Λ and Ξ production in nucleus-nucleus collisions at 40A and 158A GeV measured at the CERN Super Proton Synchrotron

Author

Anticic, T. Baatar, B. Barna, D. Bartke, J. Beck, H. Betev, L. Białkowska, H. Blume, C. Boimska, B. Book, J. Botje, M. Bracinik, J. Bunčić, P. Cerny, V. Christakoglou, P. Chung, P. Chvala, O. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Fodor, Z. Foka, P. Friese, V. Gál, J. Gaździcki, M. Genchev, V. Grebieszkow, K. Hegyi, S. Höhne, C. Kadija, K. Karev, A. Kresan, D. Kolesnikov, V.I. Kowalski, M. Kraus, I. Kreps, M. Laszlo, A. Lacey, R. Leeuwen, M.V. Lévai, P. Litov, L. Lungwitz, B. Makariev, M. Malakhov, A.I. Mateev, M. Melkumov, G.L. Meurer, C. 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. Utvić, M. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Włodarczyk, Z. Wojtaszek, A. Yoo, I.K.

Abstract

Results on Λ, Λ̄, and Ξ- production in centrality selected Pb+Pb reactions at 40A and 158A GeV and in near-central C+C and Si+Si reactions at 158A GeV are presented. Transverse mass spectra, rapidity spectra, and multiplicities in dependence of the system size are discussed. Comparisons to transport models (ultrarelativistic quantum molecular dynamics and hadron string dynamics) and to the core-corona approach are performed. Although Λ and Λ̄ production can be described by transport models reasonably well, these models do not agree with the Ξ- measurements. However, the core-corona picture fits very well the system-size dependence of Λ and Ξ-, whereas it agrees less well with the Λ̄ data. © 2009 The American Physical Society.

Published
2009

37. Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from sNN=6.3 to 17.3 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. Bunčcić, 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. Gładysz, 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. Kresan, D. 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. 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. Yoo, I.K.

Subjects
Nuclear Experiment
Abstract

We present measurements of the energy dependence of event-by-event fluctuations in the K/π and (p+p̄)/π multiplicity ratios in heavy-ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central Pb+Pb collisions at five collision energies, sNN, between 6.3 and 17.3 GeV. After accounting for the effects of finite-number statistics and detector resolution, we extract the strength of nonstatistical fluctuations at each energy. For the K/π ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the (p+p̄)/π ratio are smaller than expectations from independent particle production, indicating correlated pion and proton production from resonance decays. For both ratios, the deviation from purely statistical fluctuations shows an increase toward lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the K/π ratio fluctuations. © 2009 The American Physical Society.

Published
2009

38. System-size dependence of Lambda and Xi production in nucleus-nucleus collisions at 40A and 158A GeV measured at the CERN Super Proton Synchrotron

Author

Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Beck, H., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Book, J., Botje, M., Bracinik, J., Bunčić, Predrag, Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J. G., Csato, P., Dinkelaker, P., Eckardt, V., Fodor, Z., Foka, P., Friese, V., Gal, J., Gazdzicki, M., Genchev, V., Grebieszkow, K., Hegyi, S., Hohne, C., Kadija, Krešo, Karev, A., Kolesnikov, V. I., 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., Mitrovski, M., Molnar, J., Mrowczynski, S., Nikolić, Vedran, 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., Utvic, M., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, Danilo, Wlodarczyk, Z., Wojtaszek, A., and Yoo, I. K.

Subjects
Physics, Lambda, Xi, heavy ion, QGP, SPS, CERN, system size, Nuclear Experiment
Abstract

Results on Lambda, anti-Lambda, and Xi- production in centrality selected Pb+Pb reactions at 40A and 158A GeV and in near-central C+C and Si+Si reactions at 158A GeV are presented. Transverse mass spectra, rapidity spectra, and multiplicities in dependence of the system size are discussed. Comparisons to transport models (ultrarelativistic quantum molecular dynamics and hadron string dynamics) and to the core-corona approach are performed. Although Lambda and anti-Lambda production can be described by transport models reasonably well, these models do not agree with the Xi- measurements. However, the core-corona picture fits very well the system-size dependence of Lambda and Xi-, whereas it agrees less well with the anti-Lambda data.

Published
2009

39. The NA49 Collaboration

Author

Anticic, T. Baatar, B. Barna, D. Bartke, J. Beck, H. Betev, L. Białkowska, H. Blume, C. Boimska, B. Book, J. Botje, M. Bracinik, J. Bunčić, P. Cerny, V. Christakoglou, P. Chung, P. Chvala, O. Cramer, J.G. Csató, P. Dinkelaker, P. Eckardt, V. Fischer, H.G. Fodor, Z. Foka, P. Friese, V. Gál, J. Gaździcki, M. Genchev, V. Grebieszkow, K. Hegyi, S. Höhne, C. Kadija, K. Karev, A. Kolesnikov, V.I. 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. 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. Utvić, M. Varga, D. Vassiliou, M. Veres, G.I. Vesztergombi, G. Vranić, D. Wenig, S. Włodarczyk, Z. Wojtaszek, A.

Published
2009

40. Energy dependence of transverse momentum fluctuations in Pb+Pb collisions at the CERN Super Proton Synchrotron (SPS) at 20A to 158A GeV

Author

Antičić, Tome, Baatar, B., Barna, D., Bartke, J., Betev, L., Bialkowska, H., Blume, C., Boimska, B., Botje, M., Bracinik, J., Bunčić, Predrag, Cerny, V., Christakoglou, P., Chung, P., Chvala, O., Cramer, J. G., Csato, P., Dinkelaker, P., Eckardt, V., 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, Kolesnikov, V. I., Kornas, E., Korus, R., Kowalski, M., 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, Vedran, 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., Utvic, M., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, Danilo, Wlodarczyk, Z., Wojtaszek, A., and Yoo, I. K.

Subjects
NA49, SPS, QGP, fluctuation, transverse momenta, Physics, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment, Particle Physics - Experiment
Abstract

Results are presented on event-by-event fluctuations of transverse momenta $p_T$ in central Pb+Pb interactions at 20$A$, 30$A$, 40$A$, 80$A$, and 158$A$ GeV. The analysis was performed for charged particles at forward center-of-mass rapidity ($1.1 < y^{*}_�� < 2.6$). Three fluctuation measures were studied: the distribution of average transverse momentum - $M(p_T)$ - in the event, the $��_{p_{T}}$ fluctuation measure and two-particle transverse momentum correlations. Fluctuations of $p_T$ are small and show no significant energy dependence in the energy range of the CERN Super Proton Synchrotron. Results are compared with QCD-inspired predictions for the critical point, and with the UrQMD model. Transverse momentum fluctuations, similar to multiplicity fluctuations, do not show the increase expected for freeze-out near the critical point of QCD., Published in Phys. Rev. C

Published
2008

41. Energy dependence of phi meson production in central Pb+Pb collisions sqrt(sNN) = 6 to 17 GeV

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., 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, Krešo, 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., Levai, P., Litov, L., Lungwitz, B., Makariev, M., Malakhov, A. I., Mateev, M., Melkumov, G. L., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., 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, Danilo, Wetzler, A., Wlodarczyk, Z., Yoo, I. K., and Zimanyi, J.

Subjects
CERN, SPS, QGP, Pb+Pb, strange particle, phi, energy dependence, Physics, High Energy Physics::Experiment, Nuclear Experiment
Abstract

Phi 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.

Published
2008

42. Status and further Analysis Plans of the NA49 Collaboration

Author

Seyboth, Peter, Anticic, T, Baatar, B, Barna, D, Bartke, J, Beck, H, Betev, L, Bialkowska, H, Blume, C, Boimska, B, Book, J, Botje, M, Bracinik, J, Buncic, P, Cerny, V, Christakoglou, P, Chung, P, Chvala, O, Cramer, J G, Csató, P, Dinkelaker, P, Eckardt, V, Fischer, H G, Fodor, Z, Foka, P, Friese, V, Gál, J, Gazdzicki, M, Genchev, K, Grebieszkow, V, Hegyi, C, Hohne, K, Kadija, K, Karev, A, Kikola, D, Kolesnikov, V I, Kowalski, M, 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, Mitrovski, M, Molnár, J, Mrówczynski, S, Nicolic, V, Pálla, G, Panagiotou, A D, Panayotov, D, Peryt, W, Pikna, M, Pluta, J, Prindle, D, Pühlhofer, F, Renfordt, R, Roland, C, Roland, G, Rybczynski, M, Rybicki, A, Sandoval, N, Schmitz, A, Schuster, T, Seyboth, P, Sikler, B, Sitar, F, Skrzypczak, E, Slodkowski, M, Stefanek, G, Stock, R, Ströbele, H, Susa, T, Szentpétery, I, Sziklai, J, Szuba, M, Szymanski, P, Trubnikov, V, Utvic, M, Varga, D, Vranic, M, Vassiliou, G I, Veres, G, Vesztergombi, D, Vranic, D, Wenig, S, Wlodarczyk, Z, Wojtaszek, A, and Yoo, I K

Subjects
Detectors and Experimental Techniques
Abstract

Status report 2008 of the NA49 collaboration to the SPSC

Published
2008

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

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., 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., 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., Meurer, C., Mischke, A., Mitrovski, M., Molnar, J., Mrowczynski, St., Nikolić, Vedran, 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., Utvic, M., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, Danilo, Wetzler, A., Wlodarczyk, Z., Wojtaszek, A., Yoo, I. K., and Zimanyi, J.

Subjects
CERN, SPS, QGP, Pb+Pb, strange particle, Lambda, Xi, energy dependence, Physics, Nuclear Theory, Nuclear Experiment
Abstract

Results on Lambda, anti-Lambda, Xi-, and antiXi+ 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 anti-Xi+ multiplicities.

Published
2008

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

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., 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, Krešo, 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., Nikolić, Vedran, 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., Utvic, M., Varga, D., Vassiliou, M., Veres, G. I., Vesztergombi, G., Vranić, Danilo, Wetzler, A., Wlodarczyk, Z., Wojtaszek, A., Yoo, I. K., and Zimanyi, J.

Subjects
Physics, NA49, CERN, SPS, QGP, fluctuations, multiplicity, energy dependence, 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 omega 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

45. Three-Dimensional two-pion source image from Pb+Pb Collisions at Sqrts_NN=17.3 GeV: New constraints for source breakup dynamics

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., Zimanyi, J., Alexander, J.M., Danielewicz, P., Kisiel, A., and Pratt, S.

Subjects
Nuclear Theory, FOS: Physical sciences, Nuclear Physics - Experiment, High Energy Physics::Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Source imaging methodology is used to provide a three-dimensional two-pion source function for mid-rapidity pion pairs with $p_T, Six pages 4 figs. Submitted for publication

Published
2008

46. Energy dependence of particle ratio fluctuations in central Pb+Pb collisions from $\sqrt{s_{_{NN}}} =$~6.3 to 17.3 GeV

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., Kresan, D., 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., 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
FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

We present measurements of the energy dependence of event-by-event fluctuations in the K/pi and (p + \bar{p})/pi multiplicity ratios in heavy ion collisions at the CERN SPS. The particle ratio fluctuations were obtained for central Pb+Pb collisions at five collision energies, \sqrt{s_{_{NN}}}, between 6.3 and 17.3 GeV. After accounting for the effects of finite-number statistics and detector resolution, we extract the strength of non-statistical fluctuations at each energy. For the K/pi ratio, larger fluctuations than expected for independent particle production are found at all collision energies. The fluctuations in the (p + \bar{p})/pi ratio are smaller than expectations from independent particle production, indicating correlated pion and proton production from resonance decays. For both ratios, the deviation from purely statistical fluctuations shows an increase towards lower collision energies. The results are compared to transport model calculations, which fail to describe the energy dependence of the K/pi ratio fluctuations., Comment: 11 pages, 10 figures, update to published version

Published
2008

47. Energy dependence of $\Lambda$ and $\Xi$ production in central Pb+Pb collisions at 20A,30A,40A,80A, and 158A GeV measured at the CERN Super Proton

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., 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., 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., Richard, A., 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., Utvic, M., 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 Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, High Energy Physics::Experiment, Nuclear Physics - Experiment, Nuclear Experiment (nucl-ex), Nuclear Experiment
Abstract

Results on $\Lambda$, $\bar{\Lambda}}$, $\Xi^{-}$, and $\bar{\Xi}^{+}$ 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. While the latter provide a reasonable description of all particle yields, the first class of models fails to match the $\Xi^{-}$, and $\bar{\Xi}^{+}$ multiplicities., Comment: 16 pages, 16 figures. Finally published version after editorial revision

Published
2008

48. 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

49. 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

50. 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

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