Measurement of the ratio of<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Σ</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>to<mml:math xmlns:mml="http://www.w3.org/1998/Math/MathML" display="inline"><mml:mrow><mml:msup><mml:mrow><mml:mi>Λ</mml:mi></mml:mrow><mml:mrow><mml:mn>0</mml:mn></mml:mrow></mml:msup></mml:mrow></mml:math>inclusive production from 28.5-GeV/<i>c</i>protons on beryllium

Sullivan, Marilyn W.; Jensen, D.; Kreisler, M. N.; Marcin, Martin; Raychaudhuri, K.; Bunce, G.; Makdisi, Y. I.; Yamin, P.; Dukes, E. C.; Overseth, O. E.; Heller, Kenneth

doi:10.1103/physrevd.36.674

Cited by 27 publications

(19 citation statements)

References 33 publications

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“…Furthermore, from data on inclusive and 0 production in pBe collisions at √ s = 25 GeV, we obtain the ratio, 0 / = 0.278 ± 0.011 ± 0.05, with a statistical and a systematic error, respectively [55]. We take 0 / = 0.278 ± 0.052, thus = (0.2175 ± 0.032) + 0 .…”

Section: Modeling Susceptibilities and Correlations In Heavy Ion Collmentioning

confidence: 99%

Confronting fluctuations of conserved charges in central nuclear collisions at the LHC with predictions from Lattice QCD

et al. 2016

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We construct net baryon number and strangeness susceptibilities as well as correlations between electric charge, strangeness and baryon number from experimental data at midrapidity of the ALICE Collaboration at CERN. The data were taken in central Pb-Pb collisions at √ s NN = 2.76 TeV and cover one unit of rapidity. The resulting fluctuations and correlations are consistent with Lattice QCD results at the chiral crossover pseudocritical temperature T c 155 MeV. This agreement lends strong support to the assumption that the fireball created in these collisions is of thermal origin and exhibits characteristic properties expected in QCD at the transition from the quark gluon plasma to the hadronic phase. The volume of the fireball for one unit of rapidity at T c is found to exceed 3000 fm 3 . A detailed discussion on uncertainties in the temperature and volume of the fireball is presented. The results are linked to pion interferometry measurements and predictions from percolation theory.

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Section: Modeling Susceptibilities and Correlations In Heavy Ion Collmentioning

confidence: 99%

Confronting fluctuations of conserved charges in central nuclear collisions at the LHC with predictions from Lattice QCD

et al. 2016

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“…Fig. 3 contains the Λ/Σ 0 ratio observed in p Be (open triangle) [28] and p Ne (open circle) [29] collisions. The open square is a very recent result [30] from the STAR Collaboration at RHIC obtained for d Au collisions at √ s=200 GeV.…”

Section: Pacs 1375ev Hyperon-nucleon Interactions -1420jn Hyperomentioning

confidence: 99%

Phenomenology of the Λ/Σproduction ratio in pp collisions

et al. 2006

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Abstract. We show that the recently measured asymmetry in helicity-angle spectra of the Λ-hyperons produced in the reaction pp→K + Λp reaction and the energy dependence of the total pp→K + Λp cross section can be explained consistently by the same Λp final-state interaction. Assuming that there is no final-state interaction in the Σ 0 p channel, as suggested by the available data, we can also reproduce the energy dependence of the Λ/Σ 0 production ratio and, in particular, the rather large ratio observed near the reaction thresholds. The nominal ratio of the Λ and Σ 0 production amplitudes squared, i.e. when disregarding the final-state interaction, turns out to be about 3, which is in line with hyperon production data from proton and nuclear targets available at high energies. One of the surprising results observed at the COSY accelerator facility is the large ratio of the pp→K + Λp to pp→K + Σ 0 p cross sections near the reaction thresholds [1,2]. This ratio is as large as 28 [1] at very low energies and eventually approaches values around 3 with increasing energy. In the last few years several theoretical studies [3,4,5,6,7,8] appeared where different production scenarios were considered in order to describe simultaneously both the pp→K + Λp and pp→K + Σ 0 p reaction cross sections and, thus, the Λ/Σ 0 ratio. These included π, K as well as heavier meson exchanges, intermediate baryonic resonances coupled to the K + Λ and K + Σ 0 channels as well as the Λp and Σ 0 p final-state interaction (FSI). But, as summarized in Refs. [2,9], none of these models is able to reproduce the energy dependence of the Λ/Σ 0 ratio convincingly. A basic problem is that the relevance of the FSI on one hand side, and the interplay between the different baryonic resonances on the other side can not be resolved from considering only the total reaction cross section. Therefore, in the present paper we follow a different strategy. We look not only at the total cross sections but also at differential observables because some of them do allow to distinguish between effects from the FSI and baryonic resonances, as we pointed out recently [10]. Moreover, for the reaction pp→K + Λp data for the relevant observables are already available in the literature [11]. Note that our study is completely phenomenological in the sense that we do not consider any specific reaction mechanism. But we take into account the effects from the Λp final-state interaction. We will argue that the differential data of Ref. PACS[11] strongly support the interpretation of the measured energy-dependence of the total pp→K + Λp cross section in terms of FSI effects. At the same time, and in view of the lack of any visible FSI effects in the reaction pp→K, we come to the conclusion that the energy-dependence of the Λ/Σ 0 cross section ratio could likewise be governed primarily by FSI effects in the pp→K + Λp channel. The role of the Λp FSI in describing the pp→K + Λp cross section near the reaction threshold was already addressed after the first experiments of the COSY-...

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“…Additionally, there exist data from only one experiment on how the production of Σ 0 and Λ differ over phase space in nuclear collisions (p+Be at p lab = 28.5 GeV/c), from which it appears that the ratio Λ Σ 0 →Λγ /Λ inclusive is relatively constant at approximately 1/4. [5]. However, with possibly different feeddown contributions from resonance states in larger colliding systems, that may not be true in heavy ion collisions.…”

Section: Introductionmentioning

confidence: 99%

Reconstructing Σ⁰decays in STAR

Buren¹

2005

J. Phys. G: Nucl. Part. Phys.

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Typical comparisons of data from nuclear collisions to particle production models require a caveat for (anti)Λ yields from experimental inability to separate the contributions of those yields from Σ state decays. Recent analysis in STAR is leading toward resolving the contribution from excited Σ states [1], but the bulk contribution comes from electromagnetic decays of the (anti)Σ 0 .In the STAR detector, photon conversions into e + e − pairs in the detector material have been used to identify photons from π 0 decays [2]. A similar technique has been used here to identify photons from (anti)Σ 0 decays in conjunction with STAR's excellent PID capabilities for finding the associated (anti)Λ daughters. We report here on progress toward measuring the (anti)Σ 0 yields in various nuclear collisions at RHIC.

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Measurement of the ratio ofΣ0toΛ0inclusive production from 28.5-GeV/cprotons on beryllium

Cited by 27 publications

References 33 publications

Confronting fluctuations of conserved charges in central nuclear collisions at the LHC with predictions from Lattice QCD

Confronting fluctuations of conserved charges in central nuclear collisions at the LHC with predictions from Lattice QCD

Phenomenology of the Λ/Σproduction ratio in pp collisions

Reconstructing Σ⁰decays in STAR

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Measurement of the ratio ofΣ0toΛ0inclusive production from 28.5-GeV/cprotons on beryllium

Cited by 27 publications

References 33 publications

Confronting fluctuations of conserved charges in central nuclear collisions at the LHC with predictions from Lattice QCD

Confronting fluctuations of conserved charges in central nuclear collisions at the LHC with predictions from Lattice QCD

Phenomenology of the Λ/Σproduction ratio in pp collisions

Reconstructing Σ0decays in STAR

Contact Info

Product

Resources

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Reconstructing Σ⁰decays in STAR