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1. Photon flow in 158 A GeV Pb+Pb collisions

Author

Sergey Nikolaev, M.M. Aggarwal, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, D. Bucher, H. Büsching, L. Carlen, S. Chattopadhyay, M.P. Decowski, H. Delagrange, P. Donni, M.R. Dutta Majumdar, A.K. Dubey, K. El Chenawi, K. Enosawa, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, B. Guskov, H.Å. Gustafsson, H.H. Gutbrod, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, K. Karadjev, K. Karpio, B.W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, M. Kurata, A. Lebedev, H. Löhner, L. Luquin, D.P. Mahapatra, V. Manko, M. Martin, G. Martínez, A. Maximov, Y. Miake, G.C. Mishra, B. Mohanty, M.-J. Mora, D. Morrison, T. Mukhanova, D.S. Mukhopadhyay, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokonov, J. Nystrand, A. Oskarsson, I. Otterlund, T. Peitzmann, D. Peressounko, V. Petracek, S.C. Phatak, W. Pinganaud, F. Plasil, M.L. Purschke, J. Rak, R. Raniwala, S. Raniwala, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, C. Roy, J.M. Rubio, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, Y. Schutz, G. Shabratova, T.H. Shah, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B.C. Sinha, N. Slavine, K. Söderström, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, M. Sumbera, T. Svensson, A. Tsvetkov, L. Tykarski, E.C.v.d. Pijll, N.v. Eijndhoven, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, B. Wysłouch, and G.R. Young

Subjects
Physics, Nuclear reaction, Nuclear and High Energy Physics, Particle physics, Photon, Meson, Nuclear Theory, Hadron, Elliptic flow, Elementary particle, Nuclear physics, Pion, High Energy Physics::Experiment, Rapidity, Nuclear Experiment
Abstract

Directed and elliptic flow of pi(0) - decay photons in 158 A GeV Pb+Pb collisions has been studied near midrapidity in an analysis of data obtained with the photon spectrometer LEDA of the WA98 experiment at the CERN SPS. Preliminary results on the rapidity and transverse momentum dependence of the flow have been obtained for various centrality classes for p(T) > 0.2 GeV/c and 2.3 < y < 2.9. The results are compared with the pion flow.

Published
2003

2. Direct photon production in high-energy heavy-ion collisions

Author

V. Manko, M.M. Aggarwal, A. Agnihotri, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, Z. Böröcz, D. Bucher, A. Buijs, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, V. Djordjadze, P. Donni, I. Doubovik, S. Dutt, M.R. Dutta Majumdar, K. El Chenawi, S. Eliseev, K. Enosawa, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, B. Guskov, H.A Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B.W. Kolb, I. Kosarev, I. Koutcheryaev, T. Krümpel, A. Kugler, P. Kulinich, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, L. Luquin, D.P. Mahapatra, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, Md.F. Mir, G.C. Mishra, Y. Miyamoto, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokonov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, W. Pinanaud, M.L. Purschke, B. Raeven, J. Rak, R. Raniwala, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, C. Roy, J.M. Rubio, H. Sako, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, G. Shabratova, T.H. Shah, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, L. Tykarski, J. Urbahn, E.C.v.d. Pijll, N.v. Eijndhoven, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, B. Wyslouch, K. Yagi, Y. Yokota, and G.R. Young

Subjects
Massless particle, Physics, Nuclear physics, Nuclear reaction, Nuclear and High Energy Physics, Strange matter, Photon, Hadron, Two-photon physics, Elementary particle, Atomic physics, Particle detector
Published
1999

3. Recent results on Pb+Pb collisions at 158 AGeV from the WA98 experiment at CERN

Author

B. Wyslouch, M.M. Aggarwal, A. Agnihotri, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, D. Bucher, A. Buijs, E.-J. Buis, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, V. Djordjadze, P. Donni, I. Doubovik, M.R. Dutta Majumdar, K. El Chenawi, S. Eliseev, K. Enosawa, H. Feldmann, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, B. Guskov, H.A. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B.W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, V. Kumar, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, D.P. Mahapatra, V. Manko, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G.C. Mishra, Y. Miyamoto, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, P. Nilsson, S. Nishimura, P. Nomokov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, M.L. Purschke, B. Raeven, J. Rak, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, J.M. Rubio, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, G. Shabratova, I. Sibiriak, T. Siemiarczuk, D. Silvermyr, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N.v. Eijndhoven, W.H.v. Heeringen, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, M.A. Vos, K. Yagi, Y. Yokota, and G.R. Young

Subjects
Physics, Nuclear and High Energy Physics, Particle physics, Photon, Large Hadron Collider, Spectrometer, Physics::Instrumentation and Detectors, Hadron, Spectral line, Particle identification, Calorimeter, Nuclear physics, Nuclear Experiment, Neutral particle
Abstract

We present recent results obtained with the WA98 experiment at CERN SPS. The experiment consists of large acceptance hadron and photon spectrometers which allow to study many aspects of heavy ion collisions. We use event-by-event measurements of charged and neutral particle multiplicity to establish the limit on the prodution of Disoriented Chiral Condensates. We use the Plastic Ball detector together with a set of tracking chambers to study collective flow. The tracking chambers together with the excellent particle identification allow us to study the production of Δ ++ . The high resolution photon calorimeter array allows us to study inclusive photon and π 0 spectra and search for excess direct photons.

Published
1998

4. Search for disoriented chiral condensates in 158.A GeV Pb + Pb collisions

Author

Tapan K. Nayak, M.M. Aggarwal, A. Agnihotri, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, D. Bucher, A. Buijs, E.-J. Buis, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, K.E. Chenawi, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, V. Djordjadze, P. Donni, I. Doubovik, M.R. Dutta Majumdar, S. Eliseev, K. Enosawa, H. Feldmann, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, B. Guskov, H.A. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B.W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, V. Kumar, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, D.P. Mahapatra, V. Manko, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G.C. Mishra, Y. Miyamoto, B. Mohanty, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, S. Nishimura, P. Nomokov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, M.L. Purschke, B. Raeven, J. Rak, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, J.M. Rubio, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, G. Shabratova, I. Sibiriak, T. Siemiarczuk, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N.v. Eijndhoven, W.H.v. Heeringen, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, M.A. Vos, B. Wyslouch, K. Yagi, Y. Yokota, and G.R. Young

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Photon, Phase space, Charged particle, Nuclear Physics
Abstract

The authors have studied the production of hadrons and photons in the reaction Pb(Pb, X) at 158 A.GeV. They have applied the discrete wavelet transform to the photon and charged-particle correlations in order to obtain a set of father function coefficients. They try to explain the multiplicity fluctuations by means of localized disoriented chiral condensate domains. (7 refs). A detailed analysis of the phase space distributions of charged particles and photons have been carried out using two independent methods. The results indicate the presence of nonstatistical fluctuations in localized regions of phase space.

Published
2000

5. Present Status and Future of DCC Analysis

Author

Tapan K. Nayak, M.M. Aggarwal, A. Agnihotri, Z. Ahammed, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, P.V.K.S. Baba, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, R. Bock, E.-M. Bohne, D. Bucher, A. Buijs, E.-J. Buis, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, K.E. Chenawi, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, V. Djordjadze, P. Donni, I. Doubovik, M.R. Dutta Majumdar, S. Eliseev, K. Enosawa, H. Feldmann, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, S.K. Gupta, B. Guskov, H.A. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B.W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, V. Kumar, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, D.P. Mahapatra, V. Manko, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G.C. Mishra, Y. Miyamoto, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, B.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, S. Nishimura, P. Nomokov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, F. Plasil, M.L. Purschke, B. Raeven, J. Rak, S. Raniwala, V.S. Ramamurthy, N.K. Rao, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, J.M. Rubio, S.S. Sambyal, R. Santo, S. Sato, H. Schlagheck, H.-R. Schmidt, G. Shabratova, I. Sibiriak, T. Siemiarczuk, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N.v. Eijndhoven, W.H.v. Heeringen, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, S. Vörös, M.A. Vos, B. Wyslouch, K. Yagi, Y. Yokota, and G.R. Young

Subjects
Quantum chromodynamics, Physics, Nuclear and High Energy Physics, High energy, Chiral symmetry, Particle physics, High Energy Physics::Lattice, Nuclear Theory, High Energy Physics::Phenomenology, FOS: Physical sciences, Current analysis, High Energy Physics - Experiment, High Energy Physics - Experiment (hep-ex), Pion, Heavy ion, Nuclear Experiment, Analysis method, Particle Physics - Experiment
Abstract

Disoriented Chiral Condensates (DCC) have been predicted to form in high energy heavy ion collisions where the approximate chiral symmetry of QCD has been restored. This leads to large imbalances in the production of charged to neutral pions. Sophisticated analysis methods are being developed to disentangle DCC events out of the large background of events with conventionally produced particles. We present a short review of current analysis methods and future prospects., 12 pages, 5 figures. Invited talk presented at the 13th International Conference on Ultrarelativistic Nucleus-Nucleus Collisions (Quark Matter 97), Tsukuba, Japan, 1-5 Dec 1997

Published
1998

6. Photon and neutral meson production in 158 AGeV 208Pb+Pb collisions

Author

Thomas Peitzmann, M. Aggarwal, A. Agnihotri, A.L.S. Angelis, V. Antonenko, V. Arefiev, V. Astakhov, V. Avdeitchikov, T.C. Awes, S.K. Badyal, A. Baldine, L. Barabach, C. Barlag, S. Bathe, B. Batiounia, T. Bernier, K.B. Bhalla, V.S. Bhatia, C. Blume, D. Bock, R. Bock, E.-M. Bohne, D. Bucher, A. Buijs, E.-J. Buis, H. Büsching, L. Carlen, V. Chalyshev, S. Chattopadhyay, K.E. Chenawi, R. Cherbatchev, T. Chujo, A. Claussen, A.C. Das, M.P. Decowski, null Devanand, V. Djordjadze, P. Donni, I. Doubovik, S. Eliseev, K. Enosawa, H. Feldmann, P. Foka, S. Fokin, V. Frolov, M.S. Ganti, S. Garpman, O. Gavrishchuk, F.J.M. Geurts, T.K. Ghosh, R. Glasow, B. Guskov, H.A. Gustafsson, H.H. Gutbrod, R. Higuchi, I. Hrivnacova, M. Ippolitov, H. Kalechofsky, R. Kamermans, K.-H. Kampert, K. Karadjev, K. Karpio, S. Kato, S. Kees, H. Kim, B.W. Kolb, I. Kosarev, I. Koutcheryaev, A. Kugler, P. Kulinich, V. Kumar, M. Kurata, K. Kurita, N. Kuzmin, I. Langbein, A. Lebedev, Y.Y. Lee, H. Löhner, D.P. Mahapatra, J. Maharana, M.D.D. Majumdar, V. Manko, M. Martin, A. Maximov, R. Mehdiyev, G. Mgebrichvili, Y. Miake, D. Mikhalev, G.C. Mishra, I.S. Mittra, Y. Miyamoto, S. Mookerjee, D. Morrison, D.S. Mukhopadhyay, V. Myalkovski, H. Naef, G.K. Nandi, S.K. Nayak, T.K. Nayak, S. Neumaier, A. Nianine, V. Nikitine, S. Nikolaev, S. Nishimura, P. Nomokov, J. Nystrand, F.E. Obenshain, A. Oskarsson, I. Otterlund, M. Pachr, A. Parfenov, S. Pavliouk, T. Peitzmann, V. Petracek, S.C. Phatak, F. Plasil, M.L. Purschke, J. Rak, S. Raniwala, V.S. Ramamurthy, N.K. Rao, B. Raven, F. Retiere, K. Reygers, G. Roland, L. Rosselet, I. Roufanov, J. Rubio, S.S. Sambyal, R. Santo, S. Sato, P. Saxena, H. Schlagheck, H.-R. Schmidt, G. Shabratova, I. Sibariak, T. Siemiarczuk, K. Singh, B.C. Sinha, N. Slavine, K. Söderström, N. Solomey, S.P. Sørensen, P. Stankus, G. Stefanek, P. Steinberg, E. Stenlund, D. Stüken, M. Sumbera, T. Svensson, M.D. Trivedi, A. Tsvetkov, C. Twenhöfel, L. Tykarski, J. Urbahn, N.v. Eijndhoven, W.H.v. Heeringen, G.J.v. Nieuwenhuizen, A. Vinogradov, Y.P. Viyogi, A. Vodopianov, M.A. Vos, B. Wyslouch, K. Yagi, Y. Yokota, G.R. Young, Angelis, Aris, Doenni, Paul, Foka, Panagiota, Kalechofsky, Hal, Martin, Michel, Naef, Hanspeter, Rosselet, Laurent, Rubio, Juan Miguel, and Solomey, Nickolas

Subjects
Physics, Nuclear physics, Nuclear and High Energy Physics, Particle physics, Transverse plane, Large Hadron Collider, Photon, Meson production, Nuclear Theory, High Energy Physics::Experiment, ddc:500.2, Multiplicity (chemistry), Nuclear Experiment
Abstract

First results from the WA98 experiment on 33 TeV 208 Pb ion reactions with various targets measured at the CERN SPS are presented. Data on transverse energy production and particle multiplicity are discussed. Special emphasis is laid on photon and neutral meson production.

Published
1996

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