Chiral symmetry restoration in strange hadronic matter

Wang, P.; Lyubovitskij, Valery E.; Gutsche, Th.; Faessler, Amand

doi:10.1103/physrevc.70.015202

Cited by 20 publications

(27 citation statements)

References 33 publications

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“…Theq 0 τ 0 are chosen from 0.84−1.8 GeV 2 . The suppression factor increases with p T was observed, it is mainly due to the energy dependence of parton energy loss and the less steep initial jet production spectra [44].…”

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confidence: 95%

η meson production of high-energy nuclear collisions at NLO

et al. 2015

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The transverse momentum spectrum of η meson in relativistic heavy-ion collisions is studied at the Next-to-Leading Order (NLO) within the perturbative QCD, where the jet quenching effect in the QGP is incorporated with the effectively medium-modified η fragmentation functions using the higher-twist approach. We show that the theoretical simulations could give nice descriptions of PHENIX data on η meson in both p+p and central Au+Au collisions at the RHIC, and also provide numerical predictions of η spectra in central Pb + Pb collisions with √ sNN = 2.76 TeV at the LHC.The ratios of η/π 0 in p + p and in central Au + Au collisions at 200 GeV are found to overlap in a wide pT region, which matches well the measured ratio η/π 0 by PHENIX. We demonstrate that, at the asymptotic region when pT → ∞ the ratios of η/π 0 in both Au + Au and p + p are almost determined only by quark jets fragmentation and thus approach to the one in e + e − scattering; in addition, the almost identical gluon (quark) contribution fractions to η and to π result in a rather moderate variation of η/π 0 distribution at intermediate and high pT region in A + A relative to that in p+p; while a slightly higher η/π 0 at small pT in Au+Au can be observed due to larger suppression of gluon contribution fraction to π 0 as compared to the one to η. The theoretical prediction for η/π 0 at the LHC has also been presented. PACS numbers: 12.38.Mh; 25.75.-q; 13.85.NiThe strong suppression of single hadron production at large transverse momentum [1,2] has provided the convincing evidence of the jet quenching phenomena discovered in relativistic heavy-ion collisions (HIC) [3]. Extensive phenomenological investigations [4-9] and experimental measurements [10-16] on the suppression of single hadron spectra at high p T have been carried out at both the RHIC and the LHC. As the first observable of jet quenching phenomena, the yield suppression of inclusive hadrons is arguably the most thoroughly studied quantity of jet quenching, and provides an indispensible tool to extract the properties of the hot medium created in nucleus-nucleus collisions by comparing theoretical calculations with experimental measurements, such as the jet transport coefficientq [17]. The interplay between theory and experiment on the single hadron production will help constraining the longitudinal distribution of parton energy loss in hot/dense QCD medium, and better understanding the jet-medium interactions after being combined with studies of full jets which also shed light on the angular distribution of the medium-induced gluon radiation and thus constrain the transverse distribution of parton energy loss as well [18][19][20][21][22][23].So far, most of the theoretical calculations on single hadron productions in HIC focus on π meson or charged hadrons (where π also giving a predominant contribu- * tion), and there are very few studies on other identified hadrons [24][25][26][27]. We note that η meson is the second important source of decay electrons and photons just after the π 0 , and...

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confidence: 95%

η meson production of high-energy nuclear collisions at NLO

et al. 2015

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“…Clearly, such vacuum induced Berry phase would have no counterpart in a model constructed by a classical driving field, hence it would be a direct proof of electromagnetic field quantization. The novel work of I. Fuentes-Guridi et al avalanched a series of following papers [15][16][17][18][19][20][21]. In particular, various extensions of Ref.…”

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confidence: 99%

“…In particular, various extensions of Ref. [14] have been addressed, such as; multi-atom (Dicke) systems [17], geometrical quantum computing [18], decohering cavity modes [19], solid state counterparts [20], and multi-level atom situations [21]. Most of these references picture one or another sort of cavity QED scheme, and more importantly the RWA has been imposed in all of them.…”

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confidence: 99%

Absence of Vacuum Induced Berry Phases without the Rotating Wave Approximation in Cavity QED

Larson

2012

Phys. Rev. Lett.

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We revisit earlier studies on Berry phases suggested to appear in certain cavity QED settings. It has been especially argued that a nontrivial geometric phase is achievable even in the situation of no cavity photons. We, however, show that such results hinge on imposing the rotating wave approximation (RWA), while without the RWA no Berry phases occur in these schemes. A geometrical interpretation of our results is obtained by introducing semiclassical energy surfaces which in a simple way brings out the phase-space dynamics. With the RWA, a conical intersection between the surfaces emerges and encircling it gives rise to the Berry phase. Without the RWA, the conical intersection is absent and therefore the Berry phase vanishes. It is believed that this is a first example showing how the application of the RWA in the Jaynes-Cummings model may lead to false conclusions, regardless of the mutual strengths between the system parameters.

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“…The conclusion being that the medium formed in central Au+Au collisions at RHIC has a high degree of opacity [34]. In addition, theoretical studies suggest that for a given initial density, the R AA (p T ) values are also sensitive to the lifetime (τ ) of dense matter formed in heavy-ion collisions [29]. The solid curves are predictions from Ref.…”

Section: Jet Quenching and Highly Opaque Mediummentioning

confidence: 93%

“…This phenomena is called as the jet quenching in a dense partonic matter [27]. The energy loss by energetic partons traversing the dense medium formed in high-energy heavy-ion collisions is predicted to be proportional to both the initial gluon density [28] and the lifetime of the dense matter [29]. The results on high-p T suppression are usually presented in terms of the nuclear modification factor (R AA ), defined as:…”

Section: Jet Quenching and Highly Opaque Mediummentioning

confidence: 99%

Exploring the quantum chromodynamics landscape with high-energy nuclear collisions

Mohanty

2011

New J. Phys.

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Quantum chromodynamics (QCD) phase diagram is usually plotted as temperature (T ) versus the chemical potential associated with the conserved baryon number (µ B ). Two fundamental properties of QCD, related to confinement and chiral symmetry, allows for two corresponding phase transitions when T and µ B are varied. Theoretically the phase diagram is explored through non-perturbative QCD calculations on lattice. The energy scale for the phase diagram (Λ QCD ∼ 200 MeV) is such that it can be explored experimentally by colliding nuclei at varying beam energies in the laboratory. In this paper we review some aspects of the QCD phase structure as explored through the experimental studies using high energy nuclear collisions. Specifically, we discuss three observations related to the formation of a strongly coupled plasma of quarks and gluons in the collisions, experimental search for the QCD critical point on the phase diagram and freeze-out properties of the hadronic phase.

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Chiral symmetry restoration in strange hadronic matter

Cited by 20 publications

References 33 publications

η meson production of high-energy nuclear collisions at NLO

η meson production of high-energy nuclear collisions at NLO

Absence of Vacuum Induced Berry Phases without the Rotating Wave Approximation in Cavity QED

Exploring the quantum chromodynamics landscape with high-energy nuclear collisions

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