STAR Results from the RHIC Beam Energy Scan-I

Kumar, L.

doi:10.1016/j.nuclphysa.2013.01.070

Cited by 57 publications

(43 citation statements)

References 30 publications

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“…in Refs. [22][23][24], and a problem that is intractable using contemporary lattice-QCD (lQCD) algorithms [25], an experimental search is underway [26,27].…”

mentioning

confidence: 99%

Critical end point in the presence of a chiral chemical potential

Cui

Cloët

et al. 2016

Phys. Rev. D

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A class of Polyakov-loop-modified Nambu-Jona-Lasinio (PNJL) models have been used to support a conjecture that numerical simulations of lattice-regularized quantum chromodynamics (QCD) defined with a chiral chemical potential can provide information about the existence and location of a critical endpoint in the QCD phase diagram drawn in the plane spanned by baryon chemical potential and temperature. That conjecture is challenged by conflicts between the model results and analyses of the same problem using simulations of lattice-regularized QCD (lQCD) and wellconstrained Dyson-Schwinger equation (DSE) studies. We find the conflict is resolved in favor of the lQCD and DSE predictions when both a physically-motivated regularization is employed to suppress the contribution of high-momentum quark modes in the definition of the effective potential connected with the PNJL models and the four-fermion coupling in those models does not react strongly to changes in the mean-field that is assumed to mock-up Polyakov loop dynamics. With the lQCD and DSE predictions thus confirmed, it seems unlikely that simulations of lQCD with µ5 > 0 can shed any light on a critical endpoint in the regular QCD phase diagram.PACS numbers: 12.38. Mh, 25.75.Nq, 12.38.Aw I. Introduction. One of the most basic questions in the Standard Model refers to unfolding the state of stronglyinteracting matter at extreme temperature and density: the former existed shortly after the Big-Bang and the latter is thought to exist in the core of compact astrophysical objects. Quantum chromodynamics (QCD) is supposed to provide the answer, which hinges on the existence and interplay between color confinement and dynamical chiral symmetry breaking (DCSB), two emergent phenomena whose domains of persistence and disappearance characterize a potentially very rich phase structure. Confinement is most simply defined empirically: those degrees-of-freedom used in defining the QCD Lagrangian (gluons and quarks) do not exist as asymptotic states, i.e. these partonic excitations do not propagate with integrity over length-scales that exceed some modest fraction of the proton's radius. The forces responsible for confinement appear to generate more than 98% of the mass of visible matter [1,2]. This is DCSB, a quantum field theoretical effect that is expressed and explained via, inter alia, the appearance of momentum-dependent massfunctions for quarks [3][4][5][6] and gluons [7][8][9][10][11][12], and helicityflipping terms in quark-gauge-boson vertices [13][14][15][16][17][18], all in the absence of any Higgs-like mechanism.Owing to the complexity of strong interaction theory, attempts are often made to develop insights concerning confinement, DCSB, and the associated phase diagram in

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“…in Refs. [22][23][24], and a problem that is intractable using contemporary lattice-QCD (lQCD) algorithms [25], an experimental search is underway [26,27].…”

mentioning

confidence: 99%

Critical end point in the presence of a chiral chemical potential

Cui

Cloët

et al. 2016

Phys. Rev. D

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“…The spectra are measured using TPC+TOF up to 4 GeV/c for strange baryons and less than 2 GeV/c for π, K, p,p. The similar spectra for identified particles at other BES energies were presented in [25][26][27]. Multi-strange hadrons are important probes for the search of the phase boundaries of QGP (see [28] and references therein).…”

Section: Hadron Spectra In Au+aumentioning

confidence: 53%

“…The kinetic freeze-out temperature and average collective velocity parameters are extracted from blast-wave fits to the identified hadron spectra. STAR spectra of particles π, K, p, Λ, Ξ and their anti-particles were used to determine the different particle ratios and to obtain the phase diagram in {T ch , μ B } and {T kin , < β >} planes [24][25][26][27]. Figure 6(a) demonstrates the dependence of T ch and μ B on centrality (number of participants N part ) at different energies √ s NN = 7.7, 11.5, 14.5, 19.6, 27, and 39 GeV.…”

Section: Thermodynamic Parametersmentioning

confidence: 99%

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Recent STAR heavy-ion results

Tokarev¹

2017

EPJ Web Conf.

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Abstract. The recent STAR heavy-ion results obtained in the first phase of the RHIC Beam Energy Scan program are presented. The measurements of particle spectra have been performed over a wide range of collision energy √ s NN =7.7-200 GeV, centrality and transverse momentum of produced particles. The fixed target mode in heavy-ion collisions at the STAR experiment also extends considerably the range of search for the new physics. Heavy quarks provide an exceptional probe in understanding properties of the hot and dense medium created in such collisions. The Heavy Flavor Tracker (HFT) and Muon Telescope Detector (MTD) upgrades at the STAR experiment at RHIC significantly improved the experimental capabilities of TPC, ToF and EMC detectors in measuring both open and hidden heavy flavor hadrons in heavy-ion collisions.

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“…), a beam energy scan including lower energy is needed [5] (see Figure 1, right). By performing a beam-energy scan using heavy-ion projectiles, changes are experimentally produced in (i) initial extreme condition, (ii) development of the hydrodynamical system (with a specific viscosity and entropy), (iii) hadronization (chemical-freeze-out) point, and (iv) kinetic freeze-out point.…”

Section: Heavy Ion Physics In J-parcmentioning

confidence: 99%

Heavy Ion Acceleration at J-PARC

Sato

2018

EPJ Web Conf.

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Abstract. J-PARC, the Japan Proton Accelerator Research Complex, is an accelerator, which provides a high-intensity proton beam. Recently as a very attractive project, the acceleration of heavy ions produced by supplementary ion sources, called J-PARC-HI, is seriously contemplated by domestic as well as international communities. The planned facility would accelerate heavy ions up to !"! with a beam energy 20 AGeV ( !! of 6.2 AGeV). The highlight of the J-PARC-HI project is its very high beam rate up to ~10 !! Hz, which will enable the study of very rare events. Taking advantage of this high intensity, J-PARC-HI will carry out frontier studies of new and rare observables in this energy region: (i) nuclear medium modification of chiral property of vector mesons through low-mass di-lepton signal, (ii) QCD critical point characterization through event-by-event fluctuation signals of particle production, (iii) systematic measurements related to the equation of state through collective flow signal or two-particle momentum correlation signal, or (iv) the search of hyper nuclei with multi strangeness including or exceeding S = 3. The current plan of J-PARC-HI aims to carrying out the first experimental measurements in 2025.

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STAR Results from the RHIC Beam Energy Scan-I

Cited by 57 publications

References 30 publications

Critical end point in the presence of a chiral chemical potential

Critical end point in the presence of a chiral chemical potential

Recent STAR heavy-ion results

Heavy Ion Acceleration at J-PARC

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