This corrects the article DOI: 10.1103/PhysRevLett.92.062301.

This corrects the article DOI: 10.1103/PhysRevLett.89.132301.

Production of d, t, and ^3He nuclei in central Pb+Pb interactions was studied at five collision energies (√(s_NN)= 6.3, 7.6, 8.8, 12.3, and 17.3 GeV) with the NA49 detector at the CERN SPS. Transverse momentum spectra, rapidity distributions, and particle ratios were measured. Yields are compared to predictions of statistical models. Phase-space distributions of light nuclei are discussed and compared to those of protons in the context of a coalescence approach. The coalescence parameters B_2 and B_3, as well as coalescence radii for d and ^3He were determined as a function of transverse mass at all energies.

We look for fluctuations expected for the QCD critical point using an intermittency analysis in the transverse momentum phase space of protons produced around midrapidity in the 12.5\% most central C+C, Si+Si and Pb+Pb collisions at the maximum SPS energy of 158$A$~GeV. We find evidence of power-law fluctuations for the Si+Si data. The fitted power-law exponent $\phi_{2} = 0.96^{+0.38}_{-0.25}\text{ (stat.)}$ $\pm 0.16\text{ (syst.)}$ is consistent with the va\-lue expected for critical fluctuations. Power-law fluctuations had previously also been observed in low-mass $\pi^+ \pi^-$ pairs in the same Si+Si collisions.

Results from the NA49 experiment at the CERN Super Proton Synchrotron (SPS) are presented on event-by-event transverse momentum and multiplicity fluctuations of charged particles, produced at forward rapidities in central Pb + Pb interactions at beam momenta 20A, 30A, 40A, 80A, and 158A GeV/c, as well as in systems of different sizes (p + p, C + C, Si + Si, and Pb Pb) at 158A GeV/c. This publication extends the previous NA49 measurements of the strongly intensive measure Phi(PT) by a study of the recently proposed strongly intensive measures of fluctuations Delta [P-T, N] and Sigma[P-T, N]. In the explored kinematic region transverse momentum and multiplicity fluctuations show no significant energy dependence in the SPS energy range. However, a remarkable system size dependence is observed for both Delta[P-T,N] and Sigma[P-T, N], with the largest values measured in peripheral Pb + Pb interactions. The results are compared with NA61/SHINE (SPS Heavy Ion and Neutrino Experiment) measurements in p + p collisions, as well as with predictions of The Ultrarelativistic Quantum Molecular Dynamics and EPOS models.

The momentum correlation between protons and lambda particles emitted from central Pb+Pb collisions at √ s NN = 17.3 GeV was studied by the NA49 experiment at the CERN SPS. A clear enhancement is observed for small relative momenta ( q inv < 0 . 2 GeV). By fitting a theoretical model, which uses the strong interaction between the proton and the Λ in a given pair, to the measured data a value for the effective source size is deduced. Assuming a static Gaussian source distribution we derive an effective radius parameter of R G = 3 . 02 ± 0 . 20(stat.) +0 . 44 − 0 . 16 (syst.) fm.

Results are presented on event-by-event fluctuations in transverse momentum of charged particles, produced at forward rapidities in p+p, C+C, Si+Si and Pb+Pb collisions at 158 AGeV. Three different characteristics are discussed: the average transverse momentum of the event, the ΦpT fluctuation measure and two-particle transverse momentum correlations. In the kinematic region explored, the dynamical fluctuations are found to be small. However, a significant system size dependence of ΦpT is observed, with the largest value measured in peripheral Pb+Pb interactions. The data are compared with predictions of several models.

T. Anticic, B. Baatar, D. Barna, J. Bartke, M. Behler, L. Betev, H. Bia lkowska, A. Billmeier, C. Blume, B. Boimska, M. Botje, J. Bracinik, R. Bramm, R. Brun, P. Bunčić, 9 V. Cerny, P. Christakoglou, O. Chvala, J.G. Cramer, P. Csató, N. Darmenov, A. Dimitrov, P. Dinkelaker, V. Eckardt, P. Filip, D. Flierl, Z. Fodor, P. Foka, P. Freund, V. Friese, 13 J. Gál, M. Gaździcki, G. Georgopoulos, E. G ladysz, S. Hegyi, C. Höhne, K. Kadija, 21 A. Karev, V.I. Kolesnikov, T. Kollegger, E. Kornas, R. Korus, M. Kowalski, I. Kraus, M. Kreps, M. van Leeuwen, P. Lévai, L. Litov, M. Makariev, A.I. Malakhov, C. Markert, M. Mateev, B.W. Mayes, G.L. Melkumov, C. Meurer, A. Mischke, M. Mitrovski, J. Molnár, St. Mrówczyński, G. Pálla, A.D. Panagiotou, D. Panayotov, K. Perl, A. Petridis, M. Pikna, L. Pinsky, F. Pühlhofer, J.G. Reid, R. Renfordt, W. Retyk, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, A. Sandoval, H. Sann, N. Schmitz, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, G. Stefanek, R. Stock, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, T.A. Trainor, D. Varga, M. Vassiliou, G.I. Veres, G. Vesztergombi, D. Vranić, A. Wetzler, Z. W lodarczyk, I.K. Yoo, J. Zaranek, and J. Zimányi

A novel approach, the identity method, was used for particle identification and the study of fluctuations of particle yield ratios in Pb+Pb collisions at the CERN Super Proton Synchrotron (SPS). This procedure allows to unfold the moments of the unknown multiplicity distributions of protons (p), kaons (K), pions (π) and electrons (e). Using these moments the excitation function of the fluctuation measure ν\text{;dyn};[A, B] was measured, with A and B denoting different particle types. The obtained energy dependence of νdyn agrees with previously published NA49 results on the related measure σdyn. Moreover, νdyn was found to depend on the phase space coverage for [K, p] and [K, π] pairs. This feature most likely explains the reported differences between measurements of NA49 and those of STAR in central Au+Au collisions.

C. Alt, T. Anticic, B. Baatar, D. Barna, J. Bartke, M. Behler, L. Betev, 9 H. Bia lkowska, A. Billmeier, C. Blume, 9 B. Boimska, M. Botje, J. Bracinik, R. Bramm, R. Brun, P. Bunčić, 10 V. Cerny, P. Christakoglou, O. Chvala, J.G. Cramer, P. Csató, N. Darmenov, A. Dimitrov, P. Dinkelaker, V. Eckardt, G. Farantatos, P. Filip, D. Flierl, Z. Fodor, P. Foka, P. Freund, V. Friese, 13 J. Gál, M. Gaździcki, G. Georgopoulos, E. G ladysz, S. Hegyi, C. Höhne, K. Kadija, A. Karev, S. Kniege, V.I. Kolesnikov, T. Kollegger, R. Korus, M. Kowalski, I. Kraus, M. Kreps, M. van Leeuwen, P. Lévai, L. Litov, M. Makariev, A.I. Malakhov, C. Markert, M. Mateev, B.W. Mayes, G.L. Melkumov, C. Meurer, A. Mischke, M. Mitrovski, J. Molnár, St. Mrówczyński, G. Pálla, A.D. Panagiotou, D. Panayotov, K. Perl, A. Petridis, M. Pikna, L. Pinsky, F. Pühlhofer, J.G. Reid, R. Renfordt, W. Retyk, C. Roland, G. Roland, M. Rybczyński, A. Rybicki, 10 A. Sandoval, H. Sann, ∗ N. Schmitz, P. Seyboth, F. Siklér, B. Sitar, E. Skrzypczak, G. Stefanek, R. Stock, H. Ströbele, T. Susa, I. Szentpétery, J. Sziklai, T.A. Trainor, D. Varga, M. Vassiliou, G.I. Veres, 5 G. Vesztergombi, D. Vranić, A. Wetzler, Z. W lodarczyk, I.K. Yoo, J. Zaranek, and J. Zimányi

Results on Λ, ¯Λ, Ξ − , and ¯Ξ + production in central Pb+Pb reactions at 20 A , 30 A , 40 A , 80 A , and 158 A 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 Ξ − and ¯Ξ + multiplicities.

New measurements by the NA49 experiment of the centrality dependence of event-by-event fluctuations of the particle yield ratios (K+ + K−)/(π+ + π−), (p + bar-p)/(π+ + π−), and (K+ + K−)/(p + bar-p) are presented for Pb+Pb collisions at 158A GeV. The absolute values of the dynamical fluctuations of these ratios, quantified by the measure σdyn, increase by about a factor of two from central to semiperipheral collisions. Multiplicity scaling scenarios are tested and found to apply for both the centrality and the previously published energy dependence of the (K+ + K−)/(π+ + π−) and (p + bar-p)/(π+ + π−) ratio fluctuations. A description of the centrality and energy dependence of (K+ + K−)/(p + bar-p) ratio fluctuations by a common scaling prescription is not possible since there is a sign change in the energy dependence.

C.Alt, T.Anticic, B.Baatar, D.Barna, J.Bartke, L.Betev, H.Bia lkowska, C.Blum e, B.Boim ska, M .Botje, J.Bracinik, R.Bram m , P.Bun ci c, V.Cerny, P.Christakoglou, P.Chung, O .Chvala, J.G .Cram er, P.Csat o, P.Dinkelaker, V.Eckardt, D.Flierl, Z.Fodor, P.Foka, V.Friese, J.G al, M .G a zdzicki, V.G enchev, E.G ladysz, K .G rebieszkow, S.Hegyi, C.H ohne, K .K adija, A.K arev, D.K ikola, M .K liem ant, S.K niege, V.I.K olesnikov, E.K ornas, M .K owalski, I.K raus, M .K reps, A.Laszlo, R.Lacey, M .van Leeuwen, P.L evai, L.Litov, B.Lungwitz, M .M akariev, A.I.M alakhov, M .M ateev, G .L.M elkum ov, C.M eurer, A.M ischke, M .M itrovski, J.M oln ar, St.M r owczy nski, V.Nicolic, G .P alla, A.D.Panagiotou, D.Panayotov, A.Petridis, W .Peryt, M .Pikna, J.Pluta, D.Prindle, F.P uhlhofer, R.Renfordt, A.Richard, C.Roland, G .Roland, M .Rybczy nski, A.Rybicki, A.Sandoval, N.Schm itz, T.Schuster, P.Seyboth, F.Sikl er, B.Sitar, E.Skrzypczak, M .Slodkowski, G .Stefanek, R.Stock, C.Strabel, H.Str obele, T.Susa, I.Szentp etery, J.Sziklai, M .Szuba, P.Szym anski, V.Trubnikov, M .Utvi c, D.Varga, M .Vassiliou, G .I.Veres, G .Vesztergom bi, D.Vrani c, A.W etzler, Z.W lodarczyk, A.W ojtaszek, I.K .Yoo, and J.Zim anyi

We present exclusive meaurements of the pp→pnπ+ and pp→ppπO reactions at 1.25 GeV, 2.2 GeV and 3.5 GeV and of the pp→ppπ+π- reaction at 1.25 GeV with the High Acceptance Di-Electron Spectrometer at GSI. Total and differential cross-sections for the one-pion production channels are analyzed with the resonance model to extract the differential baryonic resonance contributions. A comparison of the two-pion production channels to effective lagrangian model predictions is on-going. The two-pion invariant mass and opening angle distributions show sensitivity to the double Δ(1232) and N(1440) → Δπ decays.