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Achasov, N. N.; Киселев, А. В.

doi:10.1103/physrevd.68.014006

Cited by 127 publications

(217 citation statements)

References 48 publications

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“…The values close to those were obtained, for example, for the processes e + e − → 3π [7] and e + e − → π 0 γ [8]. The difference between the observed phases and quark model predictions of 0 • and 180 • for these processes can be described by φ − ω and ρ − ω mixing [7,9]. Estimations show, that the contribution of the φ − ω mixing in the ηγ channel is small.…”

supporting

confidence: 83%

Reanalysis of thee+e−→ηγreaction cross section

et al. 2007

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In the experiment with the SND detector at the VEPP-2M e + e − collider measuring the e + e − → ηγ cross section in the energy range 0.6 < √ s < 1.38 GeV the reanalysis of data is performed. The goal is to improve the accuracy of the previous results by analysing ambiguities in the approximation of energy dependence of the e + e − → ηγ cross section, which were not taken into account in our previous study. We report new results on the approximation of the e + e − → ηγ cross section based on Vector Dominance Model under new model parameter assumptions. In our previous work [1] we performed a measurement of the e + e − → ηγ reaction cross section for two η-meson decay modes: η → 3π 0 and η → π + π − π 0 . The measured cross section was approximated within Vector Dominance Model (VDM). In this approximation the fact that with the free magnitudes and phases of all four ρ, ω, φ, and ρ ′ resonances, the minimized likelihood function has several minima and thus, a choice of the right minimization solution is ambiguous, was ignored. Additional physical restrictions must be applied to, at least, the parameters of the ρ ′ resonance, in order to make a right choice of the minimization solution.In this work the ρ ′ -meson parameters were estimated from the experimental data on the e + e − → ηρ cross section [2,3]. The cross section value in the ρ ′ -resonance maximum obtained from the approximation of the e + e − → ηρ cross section can be translated to the e + e − → ρ ′ → ηγ cross section using VDM as in Ref. [4]. The approximation of the data on the e + e − → ηρ cross section was done with three different models describing the energy dependence of the ρ ′ resonance width:Under these assumptions the resulting mass, width, and maximum cross section of the ρ ′ resonance varied within 1440-1520 MeV, 220-400 MeV, and 0.08-0.13 nb, respectively. All three ρ ′ parameter sets were used in the e + e − → ηγ cross section approximation. The difference in the experimental results was included in the systematic uncertainty of the final result. The cross section at the ρ ′ resonance maximum acquired an additional 20% systematic error from the uncertainty of the cross section calculation in the VDM.Natural values for the phase of the ρ ′ amplitude are 0 or 180 degrees. The phase shift from these values can be induced by the ρ and ρ ′ mixing via common decay channels, for example, ρ, ρ ′ → ωπ 0 . In the model considered in Ref. [5] it was shown that mixing is strongly energy dependent. For the approximation of the data on e + e − → ηγ cross section the ϕ ρ ′ value at the φ resonance maximum is important. Since at this energy the ρ − ρ ′ mixing is small, no significant phase shifts from 0 or 180 degrees are expected. Two approximations with the ϕ ρ ′ phase fixed at these values were considered. In order to estimate a corresponding systematic uncertainty of the approximation parameters due to the ρ ′ phase uncertainty, we varied ϕ ρ ′ by ±20 • with respect to its initial values.The fitting results with the ρ ′ parameters fixed to described ...

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supporting

confidence: 83%

Reanalysis of thee+e−→ηγreaction cross section

et al. 2007

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“…The k πη is the momentum in the a 0 → πη channel while s is defined as s = 4(m 2 K 0 + k * 2 ). In this analysis several sets of coupling parameters of a 0 (in the order of lower to higher values) taken from [19] ("Martin"), [20] ("Antonelli"), [21] ("Achasov1"), and [22] ("Achasov2") were studied.…”

Section: Neutral Kaon-charged Kaon Pairsmentioning

confidence: 99%

“…The main motivation for studying the K 0 S K ± final-state interaction is the possibility of constraining the coupling parameters of a 0 which in fact is considered in the literature as a potential tetraquark state, a hadron composed of 4 constituent quarks, or a "K − K molecule" [19][20][21][22][23][24].…”

Section: Epj Web Of Conferences 172 01007 (2018)mentioning

confidence: 99%

“…Therefore, higher values of a 0 resonance are favored by the experimental data. S K ± pairs from pp collisions at √ s = 7 TeV divided by the quadratic baseline functions with fits using a 0 parameters from [22] ("Achasov2"). …”

Section: Epj Web Of Conferences 172 01007 (2018)mentioning

confidence: 99%

“…Radius R from K 0 S K ± femtoscopy in Pb-Pb collisions at √ s NN = 2.76T eV (left, plots from [18]) and pp collisions at √ s = 7 TeV (right) averaged over the results from fits to K 0 S K + and K 0 S K + correlation functions in both collision systems. The a 0 parameters used in the fit come from [19][20][21][22] for Pb-Pb data and from [22] ("Achasov2") for pp data. …”

Section: Ali-prel-129483mentioning

confidence: 99%

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What can we learn from femtoscopic and angular correlations of identified particles in ALICE?

Graczykowski

2018

EPJ Web of Conferences

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Abstract. Two-particle correlations have proven to be a robust tool which allow the exploration of many physics phenomena present in high-energy particle collisions. In this work, two techniques, namely femtoscopic and angular correlations of identified particles, are discussed the most recent results of both of them obtained from pp and Pb-Pb collisions recorded by the ALICE detector are presented.

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