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Measurement of neutral pions and direct photons are closely connected experimentally, on the other hand they probe quite different aspects of relativistic heavy ion collisions. In this short review of the $\pi^0$ results from the PHENIX…

Nuclear Experiment · Physics 2010-02-09 G. David

Within the framework of a thermal model with its parameters fitted to the results from an isospin-dependent Boltzmann-Uehling-Uhlenbeck (IBUU) transport model, we study the pion in-medium effect on the charged-pion ratio in heavy-ion…

Nuclear Theory · Physics 2013-06-05 Jun Xu , Lie-Wen Chen , Che Ming Ko , Bao-An Li , Yu-Gang Ma

We report measurements for the balance function, transverse momentum fluctuations, and net charge fluctuations from Au+Au collisions at 20, 130, and 200 GeV as well as p+p and d+Au collisions at 200 GeV using STAR at RHIC. For Au+Au…

Nuclear Experiment · Physics 2009-11-10 Gary D. Westfall

Recent results on rho(770)^0, K(892)^*0, f_0(980), phi(1020), Delta(1232)^++, and Lambda(1520) production in A+A and p+p collisions at SPS and RHIC energies are presented. These resonances are measured via their hadronic decay channels and…

Nuclear Experiment · Physics 2009-11-10 P. Fachini

The resonance production of $\Delta$, K(892), $\Sigma$(1385), $\Lambda$(1520) and $\phi$ from elementary p+p and Au+Au collisions at $\sqrt{s_{\rm NN}} = $ 200 GeV from the STAR experiment at RHIC is presented. Yields and spectra are…

Nuclear Experiment · Physics 2019-08-14 C. Markert

We present the results on the mid-rapidity phi meson production in the K^{+}K^{-} decay channel in Au + Au collisions at sqrt(s_NN) = 200 GeV measured by the PHENIX experiment at RHIC. The spectral shape of the phi resonance, studied at…

Nuclear Experiment · Physics 2015-06-26 PHENIX Collaboration

A $\chi^2$ analysis is performed to test the resolving power of two-dimensional pion interferometry using for illustration the preliminary E802 data on $Si+Au$ at 14.6 AGeV/c. We find that the resolving power to distinguish two decoupling…

Nuclear Theory · Physics 2009-10-09 Sandra S. Padula , Miklos Gyulassy

The prediction for $p_T$ spectra of various resonances produced in Pb+Pb collisions at 2.76 TeV at the LHC in equilibrium and non-equilibrium models is made. It includes the $\eta$, $\rho$(770), $\Sigma$(1385), $\Lambda$(1520), and…

High Energy Physics - Phenomenology · Physics 2018-03-14 Viktor Begun

The subtle differences between positive and negative pion spectra can used be used to study the nature of the nuclear interaction region in heavy-ion collisions. Several large acceptance heavy ion experiments at facilities ranging from SIS,…

Nuclear Experiment · Physics 2014-08-07 D. Cebra , S. G. Brovko , C. E. Flores , B. A. Haag , J. L. Klay

Using equilibrium hydrodynamics with initial conditions for the energy and net baryon number densities from the perturbative QCD + saturation model, a good simultaneous description of the measured pion, kaon and (anti)proton spectra in…

High Energy Physics - Phenomenology · Physics 2009-11-07 K. J. Eskola , H. Niemi , P. V. Ruuskanen , S. S. Räsänen

The use of charge balance functions in heavy-ion collision studies was initially proposed as a probe of delayed hadronization and two-stage quark production in these collisions. It later emerged that general balance functions can also serve…

High Energy Physics - Phenomenology · Physics 2022-09-22 Claude Pruneau , Victor Gonzales , Brian Hanley , Ana Marin , Sumit Basu

The BRAHMS measurement of proton-to-pion ratios in Au+Au and p+p collisions at 62.4 and 200 GeV is presented as a function of transverse momentum and collision centrality within the pseudorapidity range 0 < eta < 3.2. The p/pi ratio…

Nuclear Experiment · Physics 2011-05-05 N. Katrynska , P. Staszel

An analysis is presented of the expectations of the thermal model for particle production in collisions of small nuclei. The maxima observed in particle ratios of strange particles to pions as a function of beam energy in heavy ion…

Nuclear Theory · Physics 2016-09-14 J. Cleymans , B. Hippolyte , H. Oeschler , K. Redlich , N. Sharma

Balance functions have been regarded in the past as a method of investigating the late-stage hadronization found in the presence of a strongly-coupled medium. They are also used to constrain mechanisms of particle production in large and…

High Energy Physics - Phenomenology · Physics 2024-11-19 Alexandru Manea , Claude Pruneau , Diana Catalina Brandibur , Andrea Danu , Alexandru F. Dobrin , Victor Gonzalez , Sumit Basu

The results of mid-rapidity ($0 < y < 0.8$) neutral pion spectra over an extended transverse momentum range ($1 < p_T < 12$ GeV/$c$) in $\sqrt{s_{NN}}$ = 200 GeV Au+Au collisions, measured by the STAR experiment, are presented. The neutral…

Nuclear Experiment · Physics 2010-01-27 STAR Collaboration , B. I. Abelev

We present a comprehensive analysis of hadron production in e+e- collisions at different center-of-mass energies in the framework of the statistical model of the hadron resonance gas. The model is formulated in the canonical ensemble with…

High Energy Physics - Phenomenology · Physics 2014-11-18 A. Andronic , F. Beutler , P. Braun-Munzinger , K. Redlich , J. Stachel

The light front analysis of pi^{-} mesons in A_{P} (He, C, Mg, O) + A_{T} (Li,C, Ne, Mg,Cu,Pb) collisions is carried out. The phase space of secondary pions is naturally divided into two parts in one of which the thermal equilibration…

High Energy Physics - Experiment · Physics 2007-05-23 M. Anikina , L. Chkhaidze , T. Djobava , V. Garsevanishvili , L. Kharkhelauri

We calculate the pi-/pi+ ratio for Pb+Pb at CERN/SPS energies and for Au+Au at BNL/AGS energies using a (3+1) dimensional hydrodynamical model. Without consideration of Coulomb effect an enhancement of this ratio at low mt is found…

High Energy Physics - Phenomenology · Physics 2009-10-28 N. Arbex , U. Ornik , M. Pluemer , B. R. Schlei , R. M. Weiner

Charged particles $p_T$ spectra and elliptic flow in 0-60% Au+Au collisions at RHIC are analyzed in a hydrodynamic model with hot, hadronic resonance gas in the initial state. Physically conceivable hadronic resonance gas, thermalized in…

Nuclear Theory · Physics 2014-11-21 Victor Roy , A. K. Chaudhuri

We present the first results of meson production in the K^+K^- decay channel from Au+Au collisions at sqrt(s_NN) = 200 GeV as measured at mid-rapidity by the PHENIX detector at RHIC. Precision resonance centroid and width values are…

Nuclear Experiment · Physics 2008-11-26 PHENIX Collaboration , S. S. Adler