What are the correct 
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 meson mass and width values?

Bartoš, Erik; Dubnička, S.; Liptaj, A.; Dubničková, A. Z.; Kamiński, R.

doi:10.1103/physrevd.96.113004

Cited by 9 publications

(21 citation statements)

References 15 publications

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“…are found [8], which do not coincide, neither with the values obtained by description of the BESIII-BaBaR data on σ tot (e + e − → π + π − ) by G.-S. charged pion EM FF model, nor with values of PDG.…”

Section: Discussioncontrasting

confidence: 74%

“…elaborated in [9,10], is applied, a perfect description of δ 1 1 (t) data (see Fig.2b), by a model independent phase shift δ 1 1 (t) representation [8] δ 1 1 (q) = arctg are found to be consistent with (6).…”

Section: Discussionmentioning

confidence: 62%

“…The same values of ρ 0 meson parameters are found also by a generalization of formula (5) to the region of the excited states of the ρ 0 meson [8], what can not be said about results obtained by a generalization of the pion EM FF G.-S. model [4] to the same region.…”

Section: Discussionmentioning

confidence: 71%

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The most correct ρ⁰(770) meson mass and width values

et al. 2019

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By application of the pion electromagnetic form factor and also the P-wave isovector ππ scattering phase shift parametrizations, following from the first principles, like unitarity and analyticity, for a description of the corresponding accurate data, it is clearly demonstrated that the ρ0(770) meson mass and width values obtained by the Gounaris-Sakurai model in a description of the same data can not be accepted as correct ones.

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Section: Discussioncontrasting

confidence: 74%

Section: Discussionmentioning

confidence: 62%

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The most correct ρ⁰(770) meson mass and width values

et al. 2019

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“…(12) vanishes, and comparing with a Breit-Wigner distribution formula, the first derivative of the phase shift can be given by 1=m ρ Γ ρ , one can express F The other approach employed in Ref. [4] was based on a very simple unitary and analytic (UA) formula with two symmetric poles and zeroes representing a resonance. The left-hand cut was simulated with one pole (and a symmetric zero).…”

Section: ρð1250þ From An Analysis Of the Pion Electromagnetic Formentioning

confidence: 99%

“…Now, it is true that the precise mass of a broad resonance like ρ 0 depends on the way the corresponding scattering data are analyzed. In that respect, the usual Breit-Wigner (BW) parametrizations can be very unreliable, possibly leading to deviations of the order of 10 MeV for ρð770Þ and even more than 100 MeV in the case of ρ 0 [4]. The reason is that multi-BW parametrizations typically do not satisfy unitarity, which becomes a very serious issue in highly inelastic processes like those in which ρ 0 is observed.…”

Section: Introductionmentioning

confidence: 99%

Strong evidence of the ρ(1250) from a unitary multichannel reanalysis of elastic scattering data with crossing-symmetry constraints

et al. 2020

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An analysis is presented of elastic P-wave ππ phase shifts and inelasticities up to 2 GeV, aimed at identifying the corresponding J PC ¼ 1 −− excited ρ resonances and focusing on the ρð1250Þ vs ρð1450Þ controversy. The approach employs an improved parametrization in terms of a manifestly unitary and analytic three-channel S matrix with its complex-energy pole positions. The included channels are ππ, ρ2π, and ρρ, the latter two being effective in the sense that they mimic several experimentally observed decay modes with nearby thresholds. In an alternative fit, the ρ2π mode is replaced by ωπ, which is also an experimentally relevant channel. The improvement with respect to prior work amounts to the enforcement of maximum crossing symmetry through once-subtracted dispersion relations called GKPY equations. A separate analysis concerns the pion electromagnetic form factor, which again demonstrates the enormous importance of guaranteeing unitarity and analyticity when dealing with very broad and highly inelastic resonances. In the case of ρð1250Þ vs ρð1450Þ, the failure to do so is shown to give rise to an error in the predicted mass of about 170 MeV. A clear picture emerges from these analyses, identifying five vector ρ states below 2 GeV, viz. ρð770Þ, ρð1250Þ, ρð1450Þ, ρð1600Þ, and ρð1800Þ, with ρð1250Þ being indisputably the most important excited ρ resonance. The stability of the fits as well as the imposition of unitarity, analyticity, and approximate crossing symmetry in the analyses lend very strong support to these assignments. The possibly far-reaching consequences for meson spectroscopy are discussed.

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Explicit form of the R-ratio of electron–positron annihilation into hadrons

Нестеренко

2019

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

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The explicit expression for the R-ratio of electron-positron annihilation into hadrons, which properly accounts for all the effects due to continuation of the spacelike perturbative results into the timelike domain, is obtained at an arbitrary loop level. Several equivalent ways to derive a commonly employed approximation of the R-ratio are recapped and the impact of discarded in the latter higher-order π 2 -terms on the evaluation of the strong running coupling is elucidated. The obtained results substantially facilitate the theoretical study of electron-positron annihilation into hadrons and the related strong interaction processes.

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What are the correct ρ0(770) meson mass and width values?

Cited by 9 publications

References 15 publications

The most correct ρ⁰(770) meson mass and width values

The most correct ρ⁰(770) meson mass and width values

Strong evidence of the ρ(1250) from a unitary multichannel reanalysis of elastic scattering data with crossing-symmetry constraints

Explicit form of the R-ratio of electron–positron annihilation into hadrons

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What are the correct ρ0(770) meson mass and width values?

Cited by 9 publications

References 15 publications

The most correct ρ0(770) meson mass and width values

The most correct ρ0(770) meson mass and width values

Strong evidence of the ρ(1250) from a unitary multichannel reanalysis of elastic scattering data with crossing-symmetry constraints

Explicit form of the R-ratio of electron–positron annihilation into hadrons

Contact Info

Product

Resources

About

The most correct ρ⁰(770) meson mass and width values

The most correct ρ⁰(770) meson mass and width values