NA49 Collaboration

SU(3) systematization of baryons: Theoretical methods and mixing with the antidecuplet

“…Experimental indications of the existence of Θ + [1][2][3][4][5][6][7][8][9][10][11], the first explicitly pentaquark baryon, as well negative results of the search for the Θ + [12][13][14][15], require a deep revision of our views on many aspects of phenomenology of strongly interacting particles. There also exist positive [16] and negative [15,17] reports on the search of another pentaquark member of the antidecuplet, the Ξ 3/2 , as well as a positive report on the search for an anti-charmed baryon state [18]. While several hundred papers appeared since the first announcement of the Θ + signal [1], none of them tried to approach the issue of pentaquark baryons using the most general and model-independent method of the (approximate) flavor SU(3) symmetry of strong interactions.…”

SU(3) constraints on cryptoexotic pentaquarks

“…It is the purpose of the present paper to examine if the SU(3) symmetry alone is able to explain, or -more modestly -to accommodate further exotics that follow inevitably from the discovery of Θ + . Experimentally another exotic state, namely Ξ −− 3/2 (1860) (here subscript 3/2 refers to isospin), has been already announced by NA49 experiment at CERN [29]. Theoretically, it is clear that there must be other cryptoexotic states which span antidecuplet of flavor SU (3).…”

On Descriptions of Particle Transverse Momentum Spectra in High Energy Collisions

“…1, but showing the spectra of various particles produced at mid-y in central Pb-Pb collisions at high √ sNN , where the factor (1/2π) on the vertical axis is removed in some cases and Nevt if available denotes the particle number which can be removed. The symbols represent the experimental data measured by the NA49 [34,35,36] and ALICE [37] Collaborations.…”

“…In this work, the p T (m T ) spectra of positively and negatively charged pions (π + and π − ), positively and negatively charged kaons (K + and K − ), protons and antiprotons (p andp) produced at mid-(pseudo)rapidity (mid-y or mid-η) measured in central gold-gold (Au-Au) collisions at the Alternating Gradient Synchrotron (AGS) by the E866 [24], E895 [25,26], and E802 [27,28] Collaborations and at the Relativistic Heavy Ion Collider (RHIC) by the STAR [29,30,31] and PHENIX [32,33] Collaborations, in central leadlead (Pb-Pb) collisions at the Super Proton Synchrotron (SPS) by the NA49 Collaboration [34,35,36] and at the Large Hadron Collider (LHC) by the ALICE Collaboration [37], as well as in inelastic (INEL) proton-proton (pp) collisions at the SPS by the NA61/SHINE Collaboration [38,39], at the RHIC by the PHENIX Collaboration [40], and at the LHC by the CMS Collaboration [41,42] are studied. The (two-component) standard distribution is used to fit the data and to extract T , T i , T 0 , and β T , as well as the excitation functions of parameters (the energy dependent parameters).…”