Showing papers by "J. Pluta published in 2006"

ALICE: Physics Performance Report, Volume II

Abstract: ALICE is a general-purpose heavy-ion experiment designed to study the physics of strongly interacting matter and the quark–gluon plasma in nucleus–nucleus collisions at the LHC. It currently involves more than 900 physicists and senior engineers, from both the nuclear and high-energy physics sectors, from over 90 institutions in about 30 countries.The ALICE detector is designed to cope with the highest particle multiplicities above those anticipated for Pb–Pb collisions (dNch/dy up to 8000) and it will be operational at the start-up of the LHC. In addition to heavy systems, the ALICE Collaboration will study collisions of lower-mass ions, which are a means of varying the energy density, and protons (both pp and pA), which primarily provide reference data for the nucleus–nucleus collisions. In addition, the pp data will allow for a number of genuine pp physics studies.The detailed design of the different detector systems has been laid down in a number of Technical Design Reports issued between mid-1998 and the end of 2004. The experiment is currently under construction and will be ready for data taking with both proton and heavy-ion beams at the start-up of the LHC.Since the comprehensive information on detector and physics performance was last published in the ALICE Technical Proposal in 1996, the detector, as well as simulation, reconstruction and analysis software have undergone significant development. The Physics Performance Report (PPR) provides an updated and comprehensive summary of the performance of the various ALICE subsystems, including updates to the Technical Design Reports, as appropriate.The PPR is divided into two volumes. Volume I, published in 2004 (CERN/LHCC 2003-049, ALICE Collaboration 2004 J. Phys. G: Nucl. Part. Phys. 30 1517–1763), contains in four chapters a short theoretical overview and an extensive reference list concerning the physics topics of interest to ALICE, the experimental conditions at the LHC, a short summary and update of the subsystem designs, and a description of the offline framework and Monte Carlo event generators.The present volume, Volume II, contains the majority of the information relevant to the physics performance in proton–proton, proton–nucleus, and nucleus–nucleus collisions. Following an introductory overview, Chapter 5 describes the combined detector performance and the event reconstruction procedures, based on detailed simulations of the individual subsystems. Chapter 6 describes the analysis and physics reach for a representative sample of physics observables, from global event characteristics to hard processes.

Identified baryon and meson distributions at large transverse momenta from Au plus Au collisions at root(S)(NN)=200 GeV

Abstract: Transverse momentum spectra of pi(+/-), p, and (p) over bar p up to 12 GeV/c at midrapidity in centrality selected Au + Au collisions at root s(NN) = 200 GeV are presented. In central Au + Au collisions, both pi(+/-) and p((p) over bar) show significant suppression with respect to binary scaling at p(T) greater than or similar to 4 GeV/c. Protons and antiprotons are less suppressed than pi(+/-), in the range 1.5 less than or similar to p(T) less than or similar to 6 GeV/c. The pi(-)/pi(+) and (p) over bar /p ratios show at most a weak pT dependence and no significant centrality dependence. The p/pi ratios in central Au + Au collisions approach the values in p + p and d + Au collisions at p(T) greater than or similar to 5 GeV/c. The results at high p(T) indicate that the partonic sources of pi(+/-), p, and (p) over bar have similar energy loss when traversing the nuclear medium

Direct observation of dijets in central Au+Au collisions at sNN=200GeV

Abstract: The STAR Collaboration at the Relativistic Heavy Ion Collider reports measurements of azimuthal correlations of high transverse momentum (p(T)) charged hadrons in Au+Au collisions at higher p(T) than reported previously. As p(T) is increased, a narrow, back-to-back peak emerges above the decreasing background, providing a clear dijet signal for all collision centralities studied. Using these correlations, we perform a systematic study of dijet production and suppression in nuclear collisions, providing new constraints on the mechanisms underlying partonic energy loss in dense matter.

Minijet deformation and charge-independent angular correlations on momentum subspace (eta, phi) in Au-Au collisions at root S-NN=130 GeV

Abstract: Measurements of two-particle correlations on angular difference variables η1 − η2 (pseudorapidity) and φ1 − φ2 (azimuth) are presented for all primary charged hadrons with transverse momentum 0.15 ≤ p_t ≤ 2 GeV/c and |η| ≤ 1.3 from Au-Au collisions at √s_(NN) = 130 GeV. Large-amplitude correlations are observed over a broad range in relative angles where distinct structures appear on the same-side and away-side (i.e., relative azimuth less than π/2 or greater than π/2). The principal correlation structures include that associated with elliptic flow plus a strong, same-side peak. It is hypothesized that the latter results from correlated hadrons associated with semi-hard parton scattering in the early stage of the heavy-ion collision which produces a jet-like correlation peak at small relative angles. The width of the jet-like peak on η1 − η2 increases by a factor 2.3 from peripheral to central collisions, suggesting strong coupling of semi-hard scattered partons to a longitudinally-expanding medium. The new methods of jet analysis introduced here provide access to scattered partons at low transverse momentum well below the kinematic range where perturbative quantum chromodynamics and standard fragmentation models are applicable.

Forward neutral pion production in p+p and d+Au collisions at root(S)(NN)=200 GeV

Abstract: Measurements of the production of forward pi(0) mesons from p+p and d+Au collisions at root s(NN) = 200 GeV are reported. The p+p yield generally agrees with next-to-leading order perturbative QCD calculations. The d+Au yield per binary collision is suppressed as eta increases, decreasing to similar to 30% of the p+p yield at =4.00, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward pi(0) with charged hadrons at eta approximate to 0 show a recoil peak in p+p that is suppressed in d+Au at low pion energy. These observations are qualitatively consistent with a saturation picture of the low-x gluon structure of heavy nuclei.

Longitudinal double-spin asymmetry and cross section for inclusive jet production in polarized proton collisions at s=200GeV

Abstract: We report a measurement of the longitudinal double-spin asymmetry A(LL) and the differential cross section for inclusive midrapidity jet production in polarized proton collisions at s=200 GeV. The cross section data cover transverse momenta 5 < p(T)< 50 GeV/c and agree with next-to-leading order perturbative QCD evaluations. The A(LL) data cover 5 < p(T)< 17 GeV/c and disfavor at 98% C.L. maximal positive gluon polarization in the polarized nucleon.

Forward Neutral Pion Production inp+pandd+AuCollisions atsNN=200GeV

Abstract: Measurements of the production of forward ${\ensuremath{\pi}}^{0}$ mesons from $p+p$ and $d+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$ are reported. The $p+p$ yield generally agrees with next-to-leading order perturbative QCD calculations. The $d+\mathrm{Au}$ yield per binary collision is suppressed as $\ensuremath{\eta}$ increases, decreasing to $\ensuremath{\sim}30%$ of the $p+p$ yield at $⟨\ensuremath{\eta}⟩=4.00$, well below shadowing expectations. Exploratory measurements of azimuthal correlations of the forward ${\ensuremath{\pi}}^{0}$ with charged hadrons at $\ensuremath{\eta}\ensuremath{\approx}0$ show a recoil peak in $p+p$ that is suppressed in $d+\mathrm{Au}$ at low pion energy. These observations are qualitatively consistent with a saturation picture of the low-$x$ gluon structure of heavy nuclei.

Strange baryon resonance production in sNN=200GeV p+p and Au+Au collisions

Abstract: We report the measurements of Σ(1385) and Λ(1520) production in p+p and Au+Au collisions at √sNN=200 GeV from the STAR Collaboration. The yields and the p_T spectra are presented and discussed in terms of chemical and thermal freeze-out conditions and compared to model predictions. Thermal and microscopic models do not adequately describe the yields of all the resonances produced in central Au+Au collisions. Our results indicate that there may be a time span between chemical and thermal freeze-out during which elastic hadronic interactions occur.

Strange Baryon Resonance Production insNN=200GeVp+pandAu+AuCollisions

Abstract: We report the measurements of $\ensuremath{\Sigma}(1385)$ and $\ensuremath{\Lambda}(1520)$ production in $p+p$ and $\mathrm{Au}+\mathrm{Au}$ collisions at $\sqrt{{s}_{NN}}=200\text{ }\text{ }\mathrm{GeV}$ from the STAR Collaboration. The yields and the ${p}_{T}$ spectra are presented and discussed in terms of chemical and thermal freeze-out conditions and compared to model predictions. Thermal and microscopic models do not adequately describe the yields of all the resonances produced in central $\mathrm{Au}+\mathrm{Au}$ collisions. Our results indicate that there may be a time span between chemical and thermal freeze-out during which elastic hadronic interactions occur.

Femtoscopy in hydrodynamics-inspired models with resonances

Abstract: Effects of the choice of the freeze-out hypersurface and resonance decays on the Hanbury-Brown-Twiss (HBT) interferometry in relativistic heavy-ion collisions are studied in detail within a class of models with single freeze-out The Monte-Carlo method, as implemented in THERMINATOR, is used to generate hadronic events describing production of particles from a thermalized and expanding source All well-established hadronic resonances are included in the analysis as their role is crucial at large freeze-out temperatures We find that presence of the the short-lived resonances increase the pionic HBT radii by about 1 fm We use the two-particle method to extract the correlation functions, which allows us to study the Coulomb effects We find that the pion HBT data from the Relativistic Heavy Ion Collider are fully compatible with the single freeze-out scenario, pointing at the shape of the freeze-out hypersurface where the transverse radius is decreasing with time Results for the single-particle spectra for this situation are also presented Finally, we present predictions for the kaon femtoscopy

Transverse-momentum p(t) correlations on (eta, phi) from mean-p(t) fluctuations in Au-Au collisions at root(s)(NN)=200 GeV

Abstract: We present first measurements of the pseudorapidity and azimuth (?, ) bin-size dependence of event-wise mean transverse-momentum pt fluctuations for Au?Au collisions at GeV. We invert that dependence to obtain pt autocorrelations on differences (??, ?) interpreted to represent velocity/temperature distributions on (?, ). The general form of the autocorrelations suggests that the basic correlation mechanism is parton fragmentation. The autocorrelations vary rapidly with collision centrality, which suggests that fragmentation is strongly modified by a dissipative medium in the more central Au?Au collisions relative to peripheral or p?p collisions.

Multiplicity dependence of inclusive pt spectra from p-p collisions at s=200GeV

Abstract: We report measurements of transverse momentum p(t) spectra for ten event multiplicity classes of p-p collisions at root s=200 GeV. By analyzing the multiplicity dependence we find that the spectrum shape can be decomposed into a part with amplitude proportional to multiplicity and described by a Levy distribution on transverse mass m(t), and a part with amplitude proportional to multiplicity squared and described by a Gaussian distribution on transverse rapidity y(t). The functional forms of the two parts are nearly independent of event multiplicity. The two parts can be identified with the soft and hard components of a two-component model of p-p collisions. This analysis then provides the first isolation of the hard component of the p(t) spectrum as a distribution of simple form on y(t).

Proton-Lambda correlations in central Au+Au collisions at root s(NN)=200 GeV

Abstract: We report on p-Lambda, p-(Lambda) over bar, (p) over bar-Lambda, and (p) over bar-(Lambda) over bar correlation functions constructed in central Au-Au collisions at root s(NN) = 200 GeV by the STAR experiment at RHIC. The proton and lambda source size is inferred from the p-Lambda and (p) over bar-(Lambda) over bar correlation functions. It is found to be smaller than the pion source size also measured by the STAR experiment at smaller transverse masses, in agreement with a scenario of a strong universal collective flow. The p-(Lambda) over bar and (p) over bar-Lambda correlation functions, which are measured for the first time, exhibit a large anticorrelation. Annihilation channels and/or a negative real part of the spin-averaged scattering length must be included in the final-state interactions calculation to reproduce the measured correlation function.

Multiplicity and pseudorapidity distributions of charged particles and photons at forward pseudorapidity in Au plus Au collisons at root s(NN)=62.4 GeV

Abstract: We present the centrality-dependent measurement of multiplicity and pseudorapidity distributions of charged particles and photons in Au+Au collisions at √s_(NN) = 62.4 GeV. The charged particles and photons are measured in the pseudorapidity region 2.9 ≤ η ≤ 3.9 and 2.3 ≤ η ≤ 3.7, respectively. We have studied the scaling of particle production with the number of participating nucleons and the number of binary collisions. The photon and charged particle production in the measured pseudorapidity range has been shown to be consistent with energy-independent limiting fragmentation behavior. Photons are observed to follow a centrality-independent limiting fragmentation behavior, while for charged particles it is centrality dependent. We have carried out a comparative study of the pseudorapidity distributions of positively charged hadrons, negatively charged hadrons, photons, pions, and net protons in nucleus-nucleus collisions and pseudorapidity distributions from p+p collisions. From these comparisons, we conclude that baryons in the inclusive charged particle distribution are responsible for the observed centrality dependence of limiting fragmentation. The mesons are found to follow an energy-independent behavior of limiting fragmentation, whereas the behavior of baryons is energy dependent.

Neutral kaon interferometry in Au+Au collisions at sNN=200 GeV

Abstract: We present the first statistically meaningful results fromtwo-K0s interferometry in heavy-ion collisions. A model that takes theeffect of the strong interaction into account has been used to fit themeasured correlation function. The effects of single and coupled channelwere explored. At the mean transverse mass m_T = 1.07 GeV, we obtain thevalues R = 4.09 +- 0.46 (stat.) +- 0.31 (sys) fm and lambda = 0.92 +-0.23 (stat) +- 0.13 (sys), where R and lambda are the invariant radiusand chaoticity parameters respectively. The results are qualitativelyconsistent with m_T systematics established with pions in a scenariocharacterized by a strong collective flow.

Directed flow in Au+Au collisions at sNN=62.4 GeV

Abstract: We present the directed flow (v(1)) measured in Au+Au collisions at root s(NN)=624 GeV in the midpseudorapidity region parallel to eta parallel to < 13 and in the forward pseudorapidity region 25

Pion correlations in hydro-inspired models with resonances

Abstract: The effects of the freeze-out hypersurface and resonance decays on the pion correlation functions in relativistic heavy-ion collisions are studied with help of the hydro-inspired models with single freeze-out. The heavy-ion Monte-Carlo generator THERMINATOR is used to generate hadronic events describing production of particles from a thermalized and expanding source. We find that the short-lived resonances increase the pionic HBT radii by about 1 fm. We also find that the pion HBT data from RHIC are fully compatible with the single freeze-out scenario provided a special choice of the freeze-out hypersurface is made.

Onset of Deconfinement in Pb+Pb Collisions at the CERN SPS

Abstract: The NA49 fixed-target experiment studied high energy-density matter produced in nucleus-nucleus reactions at the CERN SPS. In central Pb+Pb collisions at 158A GeV the energy density at the early stage substantially exceeds the threshold for quark deconfinement predicted by lattice QCD. The produced matter shows strong transverse and longitudinal flow. Ratios of yields of produced particles are approximately consistent with statistical equilibration. An energy scan through the SPS range revealed structure in the energy dependence of pion and kaon yields as well as of the inverse slopes of transverse mass distributions. These features suggest that a deconfined phase starts to be produced at around 30A GeV in central Pb+Pb collisions. The analysis of fluctuations and correlations has not yet provided evidence for the predicted critical point of QCD.

Rapidity and species dependence of particle production at large transverse momentum for d+Au collisions at psNN = 200 GeV

Abstract: Rapidity and species dependence of particle production at large transverse momentum for d+Au collisions at s NN = 200 GeV B.I. Abelev, 50 J. Adams, 2 M.M. Aggarwal, 30 Z. Ahammed, 45 J. Amonett, 20 B.D. Anderson, 20 M. Anderson, 6 D. Arkhipkin, 13 G.S. Averichev, 12 Y. Bai, 28 J. Balewski, 17 O. Barannikova, 9 L.S. Barnby, 2 J. Baudot, 18 S. Bekele, 29 V.V. Belaga, 12 A. Bellingeri-Laurikainen, 40 R. Bellwied, 48 F. Benedosso, 28 S. Bhardwaj, 35 A. Bhasin, 19 A.K. Bhati, 30 H. Bichsel, 47 J. Bielcik, 50 J. Bielcikova, 50 L.C. Bland, 3 S-L. Blyth, 22 B.E. Bonner, 36 M. Botje, 28 J. Bouchet, 40 A.V. Brandin, 26 A. Bravar, 3 M. Bystersky, 11 R.V. Cadman, 1 X.Z. Cai, 39 H. Caines, 50 M. Calder´ n de la Barca S´ nchez, 6 J. Castillo, 28 O. Catu, 50 o a D. Cebra, 6 Z. Chajecki, 29 P. Chaloupka, 11 S. Chattopadhyay, 45 H.F. Chen, 38 J.H. Chen, 39 J. Cheng, 43 M. Cherney, 10 A. Chikanian, 50 W. Christie, 3 J.P. Coffin, 18 T.M. Cormier, 48 M.R. Cosentino, 37 J.G. Cramer, 47 H.J. Crawford, 5 D. Das, 45 S. Das, 45 M. Daugherity, 42 M.M. de Moura, 37 T.G. Dedovich, 12 M. DePhillips, 3 A.A. Derevschikov, 32 L. Didenko, 3 T. Dietel, 14 P. Djawotho, 17 S.M. Dogra, 19 W.J. Dong, 7 X. Dong, 38 J.E. Draper, 6 F. Du, 50 V.B. Dunin, 12 J.C. Dunlop, 3 M.R. Dutta Mazumdar, 45 V. Eckardt, 24 W.R. Edwards, 22 L.G. Efimov, 12 V. Emelianov, 26 J. Engelage, 5 G. Eppley, 36 B. Erazmus, 40 M. Estienne, 18 P. Fachini, 3 R. Fatemi, 23 J. Fedorisin, 12 K. Filimonov, 22 P. Filip, 13 E. Finch, 50 V. Fine, 3 Y. Fisyak, 3 J. Fu, 49 C.A. Gagliardi, 41 L. Gaillard, 2 M.S. Ganti, 45 V. Ghazikhanian, 7 P. Ghosh, 45 J.E. Gonzalez, 7 Y.G. Gorbunov, 10 H. Gos, 46 O. Grebenyuk, 28 D. Grosnick, 44 S.M. Guertin, 7 K.S.F.F. Guimaraes, 37 Y. Guo, 48 N. Gupta, 19 T.D. Gutierrez, 6 B. Haag, 6 T.J. Hallman, 3 A. Hamed, 48 J.W. Harris, 50 W. He, 17 M. Heinz, 50 T.W. Henry, 41 S. Hepplemann, 31 B. Hippolyte, 18 A. Hirsch, 33 E. Hjort, 22 A.M. Hoffman, 23 G.W. Hoffmann, 42 M.J. Horner, 22 H.Z. Huang, 7 S.L. Huang, 38 E.W. Hughes, 4 T.J. Humanic, 29 G. Igo, 7 P. Jacobs, 22 W.W. Jacobs, 17 P. Jakl, 11 F. Jia, 21 H. Jiang, 7 P.G. Jones, 2 E.G. Judd, 5 S. Kabana, 40 K. Kang, 43 J. Kapitan, 11 M. Kaplan, 8 D. Keane, 20 A. Kechechyan, 12 V.Yu. Khodyrev, 32 B.C. Kim, 34 J. Kiryluk, 23 A. Kisiel, 46 E.M. Kislov, 12 S.R. Klein, 22 A. Kocoloski, 23 D.D. Koetke, 44 T. Kollegger, 14 M. Kopytine, 20 L. Kotchenda, 26 V. Kouchpil, 11 K.L. Kowalik, 22 M. Kramer, 27 P. Kravtsov, 26 V.I. Kravtsov, 32 K. Krueger, 1 C. Kuhn, 18 A.I. Kulikov, 12 A. Kumar, 30 A.A. Kuznetsov, 12 M.A.C. Lamont, 50 J.M. Landgraf, 3 S. Lange, 14 S. LaPointe, 48 F. Laue, 3 J. Lauret, 3 A. Lebedev, 3 R. Lednicky, 13 C-H. Lee, 34 S. Lehocka, 12 M.J. LeVine, 3 C. Li, 38 Q. Li, 48 Y. Li, 43 G. Lin, 50 X. Lin, 49 S.J. Lindenbaum, 27 M.A. Lisa, 29 F. Liu, 49 H. Liu, 38 J. Liu, 36 L. Liu, 49 Z. Liu, 49 T. Ljubicic, 3 W.J. Llope, 36 H. Long, 7 R.S. Longacre, 3 M. Lopez-Noriega, 29 W.A. Love, 3 Y. Lu, 49 T. Ludlam, 3 D. Lynn, 3 G.L. Ma, 39 J.G. Ma, 7 Y.G. Ma, 39 D. Magestro, 29 D.P. Mahapatra, 15 R. Majka, 50 L.K. Mangotra, 19 R. Manweiler, 44 S. Margetis, 20 C. Markert, 42 L. Martin, 40 H.S. Matis, 22 Yu.A. Matulenko, 32 C.J. McClain, 1 T.S. McShane, 10 Yu. Melnick, 32 A. Meschanin, 32 J. Millane, 23 M.L. Miller, 23 N.G. Minaev, 32 S. Mioduszewski, 41 C. Mironov, 20 A. Mischke, 28 D.K. Mishra, 15 J. Mitchell, 36 B. Mohanty, 22, 45 L. Molnar, 33 C.F. Moore, 42 D.A. Morozov, 32 M.G. Munhoz, 37 B.K. Nandi, 16 C. Nattrass, 50 T.K. Nayak, 45 J.M. Nelson, 2 P.K. Netrakanti, 45 V.A. Nikitin, 13 L.V. Nogach, 32 S.B. Nurushev, 32 G. Odyniec, 22 A. Ogawa, 3 V. Okorokov, 26 M. Oldenburg, 22 D. Olson, 22 M. Pachr, 11 S.K. Pal, 45 Y. Panebratsev, 12 S.Y. Panitkin, 3 A.I. Pavlinov, 48 T. Pawlak, 46 T. Peitzmann, 28 V. Perevoztchikov, 3 C. Perkins, 5 W. Peryt, 46 V.A. Petrov, 48 S.C. Phatak, 15 R. Picha, 6 M. Planinic, 51 J. Pluta, 46 N. Poljak, 51 N. Porile, 33 J. Porter, 47 A.M. Poskanzer, 22 M. Potekhin, 3 E. Potrebenikova, 12 B.V.K.S. Potukuchi, 19 D. Prindle, 47 C. Pruneau, 48 J. Putschke, 22 G. Rakness, 31 R. Raniwala, 35 S. Raniwala, 35 R.L. Ray, 42 S.V. Razin, 12 J. Reinnarth, 40 D. Relyea, 4 F. Retiere, 22 A. Ridiger, 26 H.G. Ritter, 22 J.B. Roberts, 36 O.V. Rogachevskiy, 12 J.L. Romero, 6 A. Rose, 22 C. Roy, 40 L. Ruan, 22 M.J. Russcher, 28 R. Sahoo, 15 T. Sakuma, 23 S. Salur, 50 J. Sandweiss, 50 M. Sarsour, 41 P.S. Sazhin, 12 J. Schambach, 42 R.P. Scharenberg, 33 N. Schmitz, 24 K. Schweda, 22 J. Seger, 10 I. Selyuzhenkov, 48 P. Seyboth, 24 A. Shabetai, 22 E. Shahaliev, 12 M. Shao, 38 M. Sharma, 30 W.Q. Shen, 39 S.S. Shimanskiy, 12 E Sichtermann, 22 F. Simon, 23 R.N. Singaraju, 45 N. Smirnov, 50 R. Snellings, 28 G. Sood, 44 P. Sorensen, 3 J. Sowinski, 17 J. Speltz, 18 H.M. Spinka, 1 B. Srivastava, 33 A. Stadnik, 12 T.D.S. Stanislaus, 44 R. Stock, 14 A. Stolpovsky, 48 M. Strikhanov, 26 B. Stringfellow, 33 A.A.P. Suaide, 37 E. Sugarbaker, 29 M. Sumbera, 11 Z. Sun, 21 B. Surrow, 23 M. Swanger, 10 T.J.M. Symons, 22 A. Szanto de Toledo, 37 A. Tai, 7 J. Takahashi, 37 A.H. Tang, 3 T. Tarnowsky, 33 D. Thein, 7 J.H. Thomas, 22 A.R. Timmins, 2 S. Timoshenko, 26 M. Tokarev, 12 T.A. Trainor, 47 S. Trentalange, 7 R.E. Tribble, 41 O.D. Tsai, 7 J. Ulery, 33 T. Ullrich, 3 D.G. Underwood, 1 G. Van Buren, 3 N. van der Kolk, 28 M. van Leeuwen, 22 A.M. Vander Molen, 25 R. Varma, 16 I.M. Vasilevski, 13 A.N. Vasiliev, 32 R. Vernet, 18

A new SPS programme

Abstract: A new experiemntal program to study hadron production in hadron-nucleus and nucleus-nucleus collisions at the CERN SPS has been recently proposed by the NA49-future collaboration The physics goals of the program are: -Search for the critical point of strongly interacting matter and a study of the properties of the onset of deconfinemnt in nucleus-nucleus collisions, -Measurements of correlations, fluctuations and hadron spectra at high pT in proton-nucleus collisions needed as for better understanding of nucleus-nucleus results, -Measurements of hadron production in hadron-nucleus interactions needed for neutrino (T2K) and cosmic-ray (Pierre Auger Observatory and KASCADE) expriments The physics of the nucleus-nucleus program is reviewed in this presentation

Anisotropic flow of strange particles at SPS

Abstract: C. Alt9, T. Anticic23, B. Baatar8,D. Barna4, J. Bartke6, L. Betev10, H. Bialkowska20, C. Blume9, B. Boimska20, M. Botje1, J. Bracinik3, R. Bramm9, P. Buncic10, V. Cerny3, P. Christakoglou2, P. Chung19, O. Chvala14, J.G. Cramer16, P. Csato4, P. Dinkelaker9, V. Eckardt13, D. Flierl9, Z. Fodor4, P. Foka7, V. Friese7, J. Gal4, M. Gaździcki9,11, V. Genchev18, G. Georgopoulos2, E. Gladysz6, K. Grebieszkow22, S. Hegyi4, C. Hohne7, K. Kadija23, A. Karev13, D. Kikola22, M. Kliemant9, S. Kniege9, V.I. Kolesnikov8, E. Kornas6, R. Korus11, M. Kowalski6, I. Kraus7, M. Kreps3, A. Laszlo4, R. Lacey19, M. van Leeuwen1, P. Levai4, L. Litov17, B. Lungwitz9, M. Makariev17, A.I. Malakhov8, M. Mateev17, G.L. Melkumov8, A. Mischke1, M. Mitrovski9, J. Molnar4, St. Mrowczynski11, V. Nicolic23, G. Palla4, A.D. Panagiotou2, D. Panayotov17, A. Petridis2, W. Peryt22, M. Pikna3, J. Pluta22, D. Prindle16, F. Puhlhofer12, R. Renfordt9, C. Roland5, G. Roland5, M. Rybczynski11, A. Rybicki6,10, A. Sandoval7, N. Schmitz13, T. Schuster9, P. Seyboth13, F. Sikler4, B. Sitar3, E. Skrzypczak21, M. Slodkowski22, G. Stefanek11, R. Stock9, C. Strabel9, H. Strobele9, T. Susa23, I. Szentpetery4, J. Sziklai4, M. Szuba22, P. Szymanski10,20, V. Trubnikov20, D. Varga4,10, M. Vassiliou2, G.I. Veres4,5, G. Vesztergombi4, D. Vranic7, A. Wetzler9, Z. Wlodarczyk11, A. Wojtaszek11, I.K. Yoo15, J. Zimanyi4

Energy Dependence of Multiplicity Fluctuations in Heavy Ion Collisions

Abstract: C. Alt9, T. Anticic23, B. Baatar8,D. Barna4, J. Bartke6, L. Betev10, H. Bialkowska20, C. Blume9, B. Boimska20, M. Botje1, J. Bracinik3, R. Bramm9, P. Buncic10, V. Cerny3, P. Christakoglou2, P. Chung19, O. Chvala14, J.G. Cramer16, P. Csato4, P. Dinkelaker9, V. Eckardt13, D. Flierl9, Z. Fodor4, P. Foka7, V. Friese7, J. Gal4, M. Gaździcki9,11, V. Genchev18, G. Georgopoulos2, E. Gladysz6, K. Grebieszkow22, S. Hegyi4, C. Hohne7, K. Kadija23, A. Karev13, D. Kikola22, M. Kliemant9, S. Kniege9, V.I. Kolesnikov8, E. Kornas6, R. Korus11, M. Kowalski6, I. Kraus7, M. Kreps3, A. Laszlo4, R. Lacey19, M. van Leeuwen1, P. Levai4, L. Litov17, B. Lungwitz9, M. Makariev17, A.I. Malakhov8, M. Mateev17, G.L. Melkumov8, A. Mischke1, M. Mitrovski9, J. Molnar4, St. Mrowczynski11, V. Nicolic23, G. Palla4, A.D. Panagiotou2, D. Panayotov17, A. Petridis2, W. Peryt22, M. Pikna3, J. Pluta22, D. Prindle16, F. Puhlhofer12, R. Renfordt9, C. Roland5, G. Roland5, M. Rybczynski11, A. Rybicki6,10, A. Sandoval7, N. Schmitz13, T. Schuster9, P. Seyboth13, F. Sikler4, B. Sitar3, E. Skrzypczak21, M. Slodkowski22, G. Stefanek11, R. Stock9, C. Strabel9, H. Strobele9, T. Susa23, I. Szentpetery4, J. Sziklai4, M. Szuba22, P. Szymanski10,20, V. Trubnikov20, D. Varga4,10, M. Vassiliou2, G.I. Veres4,5, G. Vesztergombi4, D. Vranic7, A. Wetzler9, Z. Wlodarczyk11, A. Wojtaszek11, I.K. Yoo15, J. Zimanyi4

Pion Correlations in Hydro-Inspired Models with Resonances

Abstract: The effects of the freeze-out hypersurface and resonance decays on the pion correlation functions in relativistic heavy-ion collisions are studied with help of the hydro-inspired models with single freeze-out. The heavy-ion Monte-Carlo generator THERMINATOR is used to generate hadronic events describing production of particles from a thermalized and expanding source. We find that the short-lived resonances increase the pionic HBT radii by about 1 fm. We also find that the pion HBT data from RHIC are fully compatible with the single freeze-out scenario provided a special choice of the freeze-out hypersurface is made.