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1. Azimuthal anisotropy of photon and charged particle emissionin 208Pb + 208Pb collisions at 158 ̇ A GeV/c

Author

Aggarwal, MM, Ahammed, Z, Angelis, ALS, Antonenko, V, Arefiev, V, Astakhov, V, Avdeitchikov, V, Awes, TC, Baba, PVKS, Badyal, SK, Bathe, S, Batiounia, B, Bernier, T, Bhatia, VS, Blume, C, Bucher, D, Büsching, H, Carlén, L, Chattopadhyay, S, Decowski, MP, Delagrange, H, Donni, P, Dutta Majumdar, MR, Dubey, AK, El Chenawi, K, Enosawa, K, Fokin, S, Frolov, V, Ganti, MS, Garpman, S, Gavrishchuk, O, Geurts, FJM, Ghosh, TK, Glasow, R, Gupta, R, Guskov, B, Gustafsson, HA, Gutbrod, HH, Hrivnacova, I, Ippolitov, M, Kalechofsky, H, Kamermans, R, Karadjev, K, Karpio, K, Kolb, BW, Kosarev, I, Koutcheryaev, I, Kugler, A, Kulinich, P, Kurata, M, Lebedev, A, Löhner, H, Luquin, L, Mahapatra, DP, Manko, V, Martin, M, Martínez, G, Maximov, A, Miake, Y, Mishra, GC, Mohanty, B, Mora, MJ, Morrison, D, Moukhanova, T, Mukhopadhyay, DS, Naef, H, Nandi, BK, Nayak, SK, Nayak, TK, Nianine, A, Nikitine, V, Nikolaev, S, Nilsson, P, Nishimura, S, Nomokonov, P, Nystrand, J, Oskarsson, A, Otterlund, I, Peitzmann, T, Peressounko, D, Petracek, V, Phatak, SC, Pinganaud, W, Plasil, F, Purschke, ML, Rak, J, Raniwala, R, Raniwala, S, Rao, NK, Retiere, F, Reygers, K, Roland, G, Rosselet, L, Roufanov, I, Roy, C, Rubio, JM, Sambyal, SS, Santo, R, Sato, S, and Schlagheck, H

Subjects
Nuclear Experiment
Abstract

The azimuthal distributions of photons and charged particles with respect to the event plane are investigated as a function of centrality in 208Pb + 208Pb collisions at 158 · A GeV/c in the WA98 experiment at the CERN SPS. The anisotropy of the azimuthal distributions is characterized using a Fourier analysis. For both the photon and charged particle distributions the first two Fourier coefficients are observed to decrease with increasing centrality. The observed anisotropies of the photon distributions compare well with the expectations from the charged particle measurements for all centralities. © Springer-Verlag / Società di Fisica 2005.

Published
2005

2. Azimuthal anisotropy of photon and charged particle emissionin 208Pb + 208Pb collisions at 158 ̇ A GeV/c

Author

Aggarwal, MM, Ahammed, Z, Angelis, ALS, Antonenko, V, Arefiev, V, Astakhov, V, Avdeitchikov, V, Awes, TC, Baba, PVKS, Badyal, SK, Bathe, S, Batiounia, B, Bernier, T, Bhatia, VS, Blume, C, Bucher, D, Büsching, H, Carlén, L, Chattopadhyay, S, Decowski, MP, Delagrange, H, Donni, P, Dutta Majumdar, MR, Dubey, AK, El Chenawi, K, Enosawa, K, Fokin, S, Frolov, V, Ganti, MS, Garpman, S, Gavrishchuk, O, Geurts, FJM, Ghosh, TK, Glasow, R, Gupta, R, Guskov, B, Gustafsson, HA, Gutbrod, HH, Hrivnacova, I, Ippolitov, M, Kalechofsky, H, Kamermans, R, Karadjev, K, Karpio, K, Kolb, BW, Kosarev, I, Koutcheryaev, I, Kugler, A, Kulinich, P, Kurata, M, Lebedev, A, Löhner, H, Luquin, L, Mahapatra, DP, Manko, V, Martin, M, Martínez, G, Maximov, A, Miake, Y, Mishra, GC, Mohanty, B, Mora, MJ, Morrison, D, Moukhanova, T, Mukhopadhyay, DS, Naef, H, Nandi, BK, Nayak, SK, Nayak, TK, Nianine, A, Nikitine, V, Nikolaev, S, Nilsson, P, Nishimura, S, Nomokonov, P, Nystrand, J, Oskarsson, A, Otterlund, I, Peitzmann, T, Peressounko, D, Petracek, V, Phatak, SC, Pinganaud, W, Plasil, F, Purschke, ML, Rak, J, Raniwala, R, Raniwala, S, Rao, NK, Retiere, F, Reygers, K, Roland, G, Rosselet, L, Roufanov, I, Roy, C, Rubio, JM, Sambyal, SS, Santo, R, Sato, S, and Schlagheck, H

Subjects
Quantum Physics, Particle and Plasma Physics, Molecular, Nuclear, Nuclear Experiment, Nuclear & Particles Physics, Atomic
Abstract

The azimuthal distributions of photons and charged particles with respect to the event plane are investigated as a function of centrality in 208Pb + 208Pb collisions at 158 · A GeV/c in the WA98 experiment at the CERN SPS. The anisotropy of the azimuthal distributions is characterized using a Fourier analysis. For both the photon and charged particle distributions the first two Fourier coefficients are observed to decrease with increasing centrality. The observed anisotropies of the photon distributions compare well with the expectations from the charged particle measurements for all centralities. © Springer-Verlag / Società di Fisica 2005.

Published
2005

3. One-, two-, and three-particle distributions from 158A GeV/c central Pb+Pb collisions

Author

Aggarwal, M M, Angelis, A L S, Antonenko, V, Arefiev, V, Astakhov, V, Avdeitchikov, V, Awes, TC, Baba, P V K S, Badyal, K, Bathe, S, Batiounia, B, Bernier, T, Bhalla, KB, Bhatia, VS, Blume, C, Bucher, D, Busching, H, Carlen, L, Chattopadhyay, S, Decowski, MP, Delagrange, H, Donni, P, Majumdar, MRD, El Chenawi, K, Enosawa, K, Fokin, S, Frolov, V, Ganti, MS, Garpman, S, Gavrishchuk, O, Geurts, FJM, Ghosh, T K, Glasow, R, Guskov, B, Gustafsson, H.A., Gutbrod, HH, Hrivnacova, I., Ippolitov, M, Kalechofsky, H, Kamermans, R, Karadjev, K, Karpio, K, Kolb, BW, Kosarev, I., Koutcheryaev, I., Kugler, A, Kulinich, P, Kurata, M, Lebedev, A, Lohner, H, Mahapatra, DP, Manko, V., Martin, M, Martinez, G, Maximov, A, Miake, Y, Mishra, GC, Mohanty, B, Mora, MJ, Morrison, D, Mukhanova, T, Mukhopadhyay, DS, Naef, H, Nandi, BK, Nayak, SK, Nayak, TK, Nianine, A, Nikitine, V, Nikolaev, S, Nilsson, P, Nishimura, S, Nomokonov, P, Nystrand, J, Oskarsson, A, Otterlund, I., Peitzmann, T, Peressounko, D, Petracek, V., Plasil, F, Purschke, ML, Rak, J, Raniwala, R, Raniwala, S, Rao, NK, Reygers, K, Roland, G, Rosselet, L, Roufanov, I, Rubio, JM, Sambyal, SS, Santo, R, Sato, S, Schlagheck, H, Schutz, Y, Shabratova, G, Shah, TH, Sibiriak, I., Siemiarczuk, T, Silvermyr, D, Sinha, BC, Slavine, N, Soderstrom, K, Sood, G, Sorensen, SP, Stankus, P, Stefanek, G, Steinberg, P, Stenlund, E, Sumbera, M, Svensson, T, Tsvetkov, A., Tykarski, L, v d Pijll, EC, v Eijndhoven, N, v Nieuwenhuizen, GJ, Vinogradov, A, Viyogi, YP, Vodopianov, A, Voros, S, Wyslouch, B, Young, GR, and Research unit Nuclear & Hadron Physics

Subjects
TWISS CORRELATION RADII, Nuclear Theory, 3-PION INTERFEROMETRY, MULTISTEP AVALANCHE CHAMBER, PHASE-SPACE DENSITY, NUCLEAR COLLISIONS, HEAVY-ION COLLISIONS, 2-PION CORRELATIONS, PERFORMANCE, Nuclear Experiment, PLUS PB COLLISIONS, PION INTERFEROMETRY
Abstract

Several hadronic observables have been studied in central 158A GeV Pb+Pb collisions using data measured by the WA98 experiment at CERN: single pi(-) and K- production, as well as two- and three-pion interferometry. The Wiedemann-Heinz hydrodynamical model has been fitted to the pion spectrum, giving an estimate of the temperature and transverse flow velocity. Bose-Einstein correlations between two identified pi(-) have been analyzed as a function of k(T), using two different parametrizations. The results indicate that the source does not have a strictly boost invariant expansion or spend time in a long-lived intermediate phase. A comparison between data and a hydrodynamical based simulation shows very good agreement for the radii parameters as a function of k(T). The pion phase-space density at freeze-out has been measured, and agrees well with the Tomasik-Heinz model. A large pion chemical potential close to the condensation limit of m(pi) seems to be excluded. The three-pion Bose-Einstein interferometry shows a substantial contribution of the genuine three-pion correlation, but not quite as large as expected for a fully chaotic and symmetric source.

Published
2003

4. Centrality dependence of neutral pion production in 158A GeV Pb-208+Pb-208 collisions

Author

Aggarwal, MM, Agnihotri, A, Ahammed, Z, Angelis, ALS, Antonenko, [No Value], Arefiev, [No Value], Astakhov, [No Value], Avdeitchikov, [No Value], Awes, TC, Baba, PVKS, Badyal, SK, Baldine, A, Barabach, L, Barlag, C, Bathe, S, Batiounia, B, Bernier, T, Bhalla, KB, Bhatia, VS, Blume, C, Bock, R, Bohne, EM, Borocz, ZK, Bucher, D, Buijs, A, Busching, H, Carlen, L, Chalyshev, [No Value], Chattopadhyay, S, Cherbatchev, R, Chujo, T, Claussen, A, Das, AC, Decowski, MP, Djordjadze, [No Value], Donni, P, Doubovik, [No Value], Majumdar, MRD, El Chenawi, K, Eliseev, S, Enosawa, K, Foka, P, Fokin, S, Frolov, [No Value], Ganti, MS, Garpman, S, Gavrishchuk, O, Geurts, FJM, Ghosh, TK, Glasow, R, Gupta, SK, Guskov, B, Gustafsson, H.-A., Gutbrod, HH, Higuchi, R, Hrivnacova, [No Value], Ippolitov, M, Kalechofsky, H, Kamermans, R, Kampert, KH, Karadjev, K, Karpio, K, Kato, S, Kees, S, Kim, H, Kolb, BW, Kosarev, [No Value], Koutcheryaev, [No Value], Krumpel, T, Kugler, A, Kulinich, P, Kurata, M, Kurita, K, Kuzmin, N, Langbein, [No Value], Lebedev, A, Lee, YY, Lohner, H, Luquin, L, Mahapatra, DP, Manko, [No Value], Martin, M, Maximov, A, Mehdiyev, R, Mgebrichvili, G, Miake, Y, Mikhalev, D, Mishra, GC, Miyamoto, Y, Morrison, D, Mukhopadhyay, DS, Myalkovski, [No Value], Naef, H, Nandi, BK, Nayak, SK, Nayak, TK, Neumaier, S, Nianine, A, Nikitine, [No Value], Nikolaev, S, Nilsson, P, Nishimura, S, Nomokonov, P, Nystrand, J, Obenshain, FE, Oskarsson, A, Otterlund, [No Value], Pachr, M, Parfenov, A, Pavliouk, S, Pietzmann, T, Patracek, [No Value], Pinanaud, W, Plasil, F, Purschke, ML, Raeven, B, Rak, J, Raniwala, R, Raniwala, S, Ramamurthy, VS, Rao, NK, Retiere, F, Reygers, K, Roland, G, Rosselet, L, Roufanov, [No Value], Roy, C, Rubio, JM, Sako, H, Sambyal, SS, Santo, R, Sato, S, Schlagheck, H, Shabratova, G, Sibiriak, [No Value], Siemiarczuk, T, Silvermyr, D, Sinha, BC, Slavine, N, Soderstrom, K, Solomey, N, Sorensen, SP, Stankus, P, Stefanek, G, Steinberg, P, Stenlund, E, Stuken, D, Sumbera, M, Svensson, T, Trivedi, MD, Tsvetkov, A., Twenhofel, C, Tykarski, L, Urbahn, J, von Eijndhoven, N, von Nieuwenhuizen, GJ, Vinogradov, A, Viyogi, YP, Vodopianov, A, Voros, S, Wyslouch, B, Yagi, K, Yokota, Y, Young, GR, and KVI - Center for Advanced Radiation Technology

Subjects
HADRONIC COLLISIONS, MODEL, CHARGED-PARTICLES, ENERGIES, Nuclear Theory, MULTIPLICITY DEPENDENCE, DISTRIBUTIONS, NUCLEUS COLLISIONS, Nuclear Experiment, TRANSVERSE-MOMENTUM SPECTRA, P-NUCLEUS
Abstract

The production of neutral pions in 158A GeV Pb-208 + Pb-208 collisions has been studied in the WA98 experiment at the CERN Super Proton Synchrotron (SPS). Transverse momentum spectra are studied for the range 0.3 less than or equal to m(T) - m(0) less than or equal to 4.0 GeV/c. The results for central collisions are compared to various models. The centrality dependence of the neutral pion spectral shape and yield is investigated. An invariance of the spectral shape and a simple scaling of the yield with the number of participating nucleons is observed for centralities with greater than about 30 participating nucleons. This is most naturally explained by assuming an equilibrated system. [S0031-9007(98)07532-2].

Published
1998

5. Soft photon production in central 200 GeV nucleon S-32+Au collisions

Author

Aggarwal, MM, Angelis, ALS, Antonenko, [No Value], Awes, TC, Badyal, SK, Barlag, C, Bhalla, KB, Bhatia, VS, Blume, C, Bock, D, Bohne, EM, Bucher, D, Buijs, A, Chattopadhyay, S, Claussen, A, Clewing, G, Das, AC, Devanand, [No Value], Donni, P, Durieux, E, Majumdar, MRD, Foka, P, Fokin, S, Ganti, MS, Garpman, S, Geurts, F, Ghosh, TK, Glasow, R, Gupta, SK, Gustafsson, H.A., Gutbrod, HH, Hartig, M, Holker, G, Ippolitov, M, Izycki, M, Kachroo, S, Kalechofsky, H, Kamermans, R, Kampert, KH, Karadjev, K, Kolb, BW, Kumar, [No Value], Langbein, [No Value], Langheinrich, J, Lebedev, A, Lohner, H, Lokanathan, S, Manko, [No Value], Martin, M, Mittra, IS, Mookerjee, S, Naef, H, Nayak, SK, Nikolaev, S, Nystrand, J, Obenshain, FE, Oskarsson, A, Otterlund, [No Value], Peitzmann, T, Plasil, F, Purschke, M, Raniwala, S, Rao, NK, Rosselet, L, Roters, B, Rubio, JM, Saini, S, Sambyal, SS, Santo, R, Siemiarczuk, T, Siemssen, R, Sinha, BC, Slegt, S, Soderstrom, K, Solomey, N, Sorensen, SP, Stefanek, G, Steinhaeuser, P, Stenlund, E, Ster, A, Stuken, D, Trivedi, MD, Twenhoefel, C, vanEijndhoven, N, vanHeeringen, E, Vinogradov, A, Viyogi, YP, Young, GR, and KVI - Center for Advanced Radiation Technology

Subjects
Nuclear Theory, High Energy Physics::Experiment, CALORIMETER, Nuclear Experiment
Abstract

Inclusive photons of low transverse momenta have been measured in 200 GeV/nucleon S-32+Au collisions at the CERN SPS. Data were taken in the WA93 experiment using a small acceptance BGO detector with longitudinal segmentation. The results are compared to WA80 measurements for the same system and results from hadron decay calculations, An excess of soft photons over the expectations from neutral meson decays is observed.

Published
1997

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