Electromagnetic pion form factor in the timelike region

Барков, Л.М.; Chilingarov, A.; Eidelman, S.; Khazin, B.I.; Lel'chuk, M.Y.; Okhapkin, V.S.; Пахтусова, Е. В.; Redin, S. I.; Ryskulov, N.M.; Shatunov, Yu. M.; Shekhtman, A.I.; Shwartz, B.; Sidorov, V.; Skrinsky, A.N.; Smakhtin, V.; Solodov, E. P.

doi:10.1016/0550-3213(85)90399-2

Cited by 373 publications

(292 citation statements)

References 34 publications

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“…as found [1] from the observed [2] isospin violating (∆I = 1) decay ω → π + π − , which underlies the dominant charge-symmetry-violating (CSV) nucleon-nucleon interaction of refs. [3,4].…”

Section: Introductionmentioning

confidence: 77%

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Vector meson dominance and ρ-ω mixing

Coon

Scadron

1998

Phys. Rev. C

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The scale of a phenomenologically successful charge-symmetry-violating nucleon-nucleon interaction, that attributed to meson exchange with a ∆I = 1 rho-omega transition, is set by the Coleman-Glashow SU (2) breaking tadpole mechanism. A single tadpole scale has been obtained from symmetry arguments, electromagnetic meson and baryon measured mass splittings, and the observed isospin violating (∆I = 1) decay ω → π + π − . The hadronic realization of this tadpole mechanism lies in the I = 1 a 0 scalar meson. We show that measured hadronic and two-photon widths of the a 0 meson, with the aid of the Vector Meson Dominance model, recover the universal Coleman-Glashow tadpole scale.

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Section: Introductionmentioning

confidence: 77%

“…One element of this universality is the value of the effective em ρ • −ω transition found [1] from the observed [2] isospin violating (∆I = 1) decay ω → π + π − .…”

Section: Discussionmentioning

confidence: 99%

Vector meson dominance and ρ-ω mixing

Coon

Scadron

1998

Phys. Rev. C

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“…In extension of our previous work [30], we here calculate the ππ phase shift and the pion EM formfactor, |F π | 2 , from our vector correlator and compare them to data [39][40][41][42], in Fig. 10.…”

Section: Vacuum Spectral Functions In the Vector And Axial-vectomentioning

confidence: 99%

Massive Yang–Mills for vector and axial-vector spectral functions at finite temperature

Hohler

Rapp

2016

Annals of Physics

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The hadronic mechanism which leads to chiral symmetry restoration is explored in the context of the ρπa1 system using Massive Yang-Mills, a hadronic effective theory which governs their microscopic interactions. In this approach, vector and axial-vector mesons are implemented as gauge bosons of a local chiral gauge group. We have previously shown that this model can describe the experimentally measured vector and axial-vector spectral functions in vacuum. Here, we carry the analysis to finite temperatures by evaluating medium effects in a pion gas and calculating thermal spectral functions. We find that the spectral peaks in both channels broaden along with a noticeable downward mass shift in the a1 spectral peak and negligible movement of the ρ peak. The approach toward spectral function degeneracy is accompanied by a reduction of chiral order parameters, i.e., the pion decay constant and scalar condensate. Our findings suggest a mechanism where the chiral mass splitting induced in vacuum is burned off. We explore this mechanism and identify future investigations which can further test it.

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“…Whereas there are different annihilation channels data obtained from different detectors, we fit every channel separately and find the formula for full cross section. The analysis is performed using the data on e + e − -annihilation to pion channels: e + e − → π + π − (CMD and OLYA detectors) [8], e + e − → 2π + 2π − (M3N, GG2, DM1, CMD, OLYA, DM2, SND, CMD2, SND, BaBar) [9][10][11][12][13][14][15][16][17][18][19], e + e − → π + π − 2π 0 (OLYA, CMD2, SND, DM2, Frascati-ADONE-GAMMA-GAMMA-2) [20][21][22][23][24][25], e + e − → 3π + 3π − (BaBar) [26], e + e − → 2π + 2π − 2π 0 (BaBar) [26].…”

Section: Fitsmentioning

confidence: 99%

Search for short strings ine⁺e⁻-annihilation

Kozhevnikova¹,

Oganesian²,

Teryaev³

2017

EPJ Web Conf.

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Abstract. In this work the behavior of power corrections to Adler function in operator product expansion (OPE) is studied, in particular the possible contribution of operator of dimension 2. The OPE terms of dimension 4 and 6 are taken into account. Various experimental data on reactions of e + e − -annihilation to pion channels (π + π − , 2π + 2π − , π + π − 2π 0 , 3π + 3π − , 2π + 2π − 2π 0 ) are used. The high-precision fits of the experimental data are obtained and used. The method based on Borel transformation of Adler function is applied. It is shown that the contribution of operator of dimension 2 is negative being compatible to zero at three standard deviations level. The strong (anti)correlation between short string and local gluon condensate is found.

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Electromagnetic pion form factor in the timelike region

Cited by 373 publications

References 34 publications

Vector meson dominance and ρ-ω mixing

Vector meson dominance and ρ-ω mixing

Massive Yang–Mills for vector and axial-vector spectral functions at finite temperature

Search for short strings ine⁺e⁻-annihilation

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Electromagnetic pion form factor in the timelike region

Cited by 373 publications

References 34 publications

Vector meson dominance and ρ-ω mixing

Vector meson dominance and ρ-ω mixing

Massive Yang–Mills for vector and axial-vector spectral functions at finite temperature

Search for short strings ine+e−-annihilation

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Product

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Search for short strings ine⁺e⁻-annihilation