Charged pion production in<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>2</mml:mn><mml:mi>A</mml:mi></mml:mrow></mml:math>to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mn>8</mml:mn><mml:mi>A</mml:mi><mml:mspace width="0.3em" /><mml:mtext>GeV</mml:mtext></mml:mrow></mml:math>central<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:mtext>Au</mml:mtext><mml:mo>+</mml:mo><mml:mtext>

Klay, J. L.; Ajitanand, N. N.; Alexander, J.; Anderson, M.; Best, D.; Brady, F.P.; Case, T.; Caskey, W.; Cebra, D.; Chance, J. L.; Chung, P.; Cole, B.; Crowe, K.; Das, A.; Draper, J. E.; Gilkes, M. L.; Gushue, S.; Heffner, M.; Hirsch, A.; Hjort, E.; Huo, L.; Justice, M.; Kaplan, M.; Keane, D.; Kintner, J. C.; Krofcheck, D.; Lacey, R.; Lauret, J.; Law, C.; Lisa, M. A.; Liu, H.; Liu, Y.M.; McGrath, Robert; Milosevich, Z.; Odyniec, G.; Olson, D.; Panitkin, S.; Pinkenburg, C.; Porile, N.; Rai, G.; Ritter, H.G.; Romero, J. L.; Scharenberg, R. P.; Srivastava, B.; Stone, N. T. B.; Symons, T. J. M.; Wang, S.; Wells, R.; Whitfield, J.; Wienold, T.; Witt, R.; Wood, L.; Zhang, W.N.

doi:10.1103/physrevc.68.054905

Cited by 154 publications

(106 citation statements)

References 149 publications

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“…This phenomenon is usually referred to as longitudinal scaling and is observed by plotting the particle yields with respect [30,31], SPS [32,33], and RHIC [6,11,12] data from [6] using the trapezoidal approximation for dN ch /dη and assuming that the mid-rapidity dN ch /dη scales as ln s NN . The dashed line is a fit to the RHIC and ALICE data derived using the trapezoidal approximation, but assuming the mid-rapidity dN ch /dη scales as s 0.15 NN as in [8].…”

Section: Resultsmentioning

confidence: 99%

Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at sNN=2.76 TeV

Abbas¹,

Abelev²,

Adam³

et al. 2013

Physics Letters B

179

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Centrality dependence of the pseudorapidity density distribution for charged particles in Pb-Pb collisions at √ s NN = 2.76 TeV ✩ .ALICE Collaboration a r t i c l e i n f o a b s t r a c tWe present the first wide-range measurement of the charged-particle pseudorapidity density distribution, for different centralities (the 0-5%, 5-10%, 10-20%, and 20-30% most central events) in Pb-Pb collisions at √ s NN = 2.76 TeV at the LHC. The measurement is performed using the full coverage of the ALICE detectors, −5.0 < η < 5.5, and employing a special analysis technique based on collisions arising from LHC 'satellite' bunches. We present the pseudorapidity density as a function of the number of participating nucleons as well as an extrapolation to the total number of produced charged particles (N ch = 17 165 ± 772 for the 0-5% most central collisions). From the measured dN ch /dη distribution we derive the rapidity density distribution, dN ch /dy, under simple assumptions. The rapidity density distribution is found to be significantly wider than the predictions of the Landau model. We assess the validity of longitudinal scaling by comparing to lower energy results from RHIC. Finally the mechanisms of the underlying particle production are discussed based on a comparison with various theoretical models.ICE detector. The employed method relies on using so-called 'satellite' bunch collisions and is based on measurements from three ✩ © CERN for the benefit of the ALICE Collaboration. different ALICE sub-detectors. This method is applicable for the 30% most central events where the trigger efficiency for these 'satellite' collisions remains high. These measurements extend considerably the former results obtained at the LHC [8-10] and can be compared to the wealth of results on the charged-particle pseudorapidity density from lower energy Au-Au collisions at RHIC [6,11, 12] as well as model calculations. Experimental setupA detailed description of the ALICE detector can be found in [13]. In the following, we will briefly describe the detectors used in this analysis, namely the Silicon Pixel Detector (SPD), the Forward Multiplicity Detector (FMD), the VZERO, and the Zero Degree Calorimeter (ZDC) (see Fig. 1).The SPD is the innermost element of the ALICE inner tracking system [13]. It consists of two cylindrical layers of hybrid silicon pixel assemblies positioned at radial distances of 3.9 and 7.6 cm from the beam line, with a total of 9.8 × 10 6 pixels of size 50 × 425 μm 2 , read out by 1200 electronic chips. The SPD coverage for particles originating from the nominal interaction point at the center of the detector is |η| < 2 and |η| < 1.4 for the inner and outer layers, respectively.The VZERO detector [14] consists of two arrays of 32 scintillator tiles (4 rings of increasing radii each with 8 azimuthal sectors) placed at distances of 3.3 m (VZERO-A) and −0.9 m (VZERO-C) from the nominal interaction point along the beam axis, covering the full azimuth within 2.8 < η < 5.1 and −3.7 < η < −1.7, 0370-2693/

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Section: Resultsmentioning

confidence: 99%

Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at sNN=2.76 TeV

Abbas¹,

Abelev²,

Adam³

et al. 2013

Physics Letters B

179

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“…The particle yields at midrapidity from PHSD are connected by lines (to draw the eye) although experimental data (taken from Refs. [19,[48][49][50][51][52][54][55][56][57][58][59][60][61][62][63][64][65][66][67][68]) and calculations do not always correspond to the same centrality selection (and system) for different bombarding energies. However, for given √ s NN , the data and calculation correspond to the same centrality and collision system.…”

Section: A Hadron Yields At Midrapiditymentioning

confidence: 99%

Baryon-antibaryon dynamics in relativistic heavy-ion collisions

Seifert

Cassing

2018

Phys. Rev. C

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The dynamics of baryon-antibaryon annihilation and reproduction (BB ↔ 3M) is studied within the PartonHadron-String Dynamics (PHSD) transport approach for Pb+Pb and Au+Au collisions as a function of centrality from lower Super Proton Synchrotron (SPS) up to Large Hadron Collider (LHC) energies on the basis of the quark rearrangement model. At Relativistic Heavy-Ion Collider (RHIC) energies we find a small net reduction of baryon-antibaryon (BB) (2013)], where a deviation of 2.7 σ was claimed by the ALICE Collaboration, should not be attributed to a net antiproton annihilation. This is in line with the observation that no substantial deviation between the data and statistical hadronization model (SHM) calculations is seen for antihyperons, since according to the PHSD analysis the antihyperons should be modified by the same amount as antiprotons. As the PHSD results for particle ratios are in line with the ALICE data (within error bars) this might point towards a deviation from statistical equilibrium in the hadronization (at least for protons and antiprotons). Furthermore, we find that the BB ↔ 3M reactions are more effective at lower SPS energies where a net suppression for antiprotons and antihyperons up to a factor of 2-2.5 can be extracted from the PHSD calculations for central Au+Au collisions.

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“…, andp produced at mid-y or mid-η in central Au-Au collisions at different √ s N N , where the particle types, y or η intervals, centrality classes, and collision energies are marked in the panels. The closed and open symbols represent respectively the experimental data of positively and negatively charged particles measured by the E866 [24], E895 [25,26], E802 [27,28], STAR [29,30,31], and PHENIX [32,33] Collaborations marked in the panels, where in Figs. 1(a)-1(d) the data for π ± and K + are taken from the E866 Collaboration [24] and the data for p are taken from the E895 Collaboration [25,26].…”

Section: Resultsmentioning

confidence: 99%

“…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).…”

Section: Introductionmentioning

confidence: 99%

On Descriptions of Particle Transverse Momentum Spectra in High Energy Collisions

Liu

Gao

Wei

2014

Advances in High Energy Physics

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Transverse momentum (mass) 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 in various collisions at high energies are analyzed in this work. The experimental data measured in central gold-gold (Au-Au) collisions at the Alternating Gradient Synchrotron (AGS) by the E866, E895, and E802 Collaborations and at the Relativistic Heavy Ion Collider (RHIC) by the STAR and PHENIX Collaborations, in central lead-lead (Pb-Pb) collisions at the Super Proton Synchrotron (SPS) by the NA49 Collaboration and at the Large Hadron Collider (LHC) by the ALICE Collaboration, as well as in inelastic (INEL) proton-proton (pp) collisions at the SPS by the NA61/SHINE Collaboration, at the RHIC by the PHENIX Collaboration, and at the LHC by the CMS Collaboration are studied. The (two-component) standard distribution is used to fit the data and the excitation function of effective temperature is obtained. Then, the excitation functions of kinetic freeze-out temperature, transverse flow velocity, and initial temperature are extracted. In the considered collisions, the four parameters increase with the increase of collision energy in general, and the kinetic freeze-out temperature appears the trend of saturation at the top RHIC and LHC.

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Charged pion production in2Ato8AGeVcentralAu+

Cited by 154 publications

References 149 publications

Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at sNN=2.76 TeV

Centrality dependence of the pseudorapidity density distribution for charged particles in Pb–Pb collisions at sNN=2.76 TeV

Baryon-antibaryon dynamics in relativistic heavy-ion collisions

On Descriptions of Particle Transverse Momentum Spectra in High Energy Collisions

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