Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold

Akhmetshin, R.R.; Amirkhanov, A.N.; Anisenkov, A. V.; Aulchenko, V.; Banzarov, V.Sh.; Bashtovoy, N.S.; Berkaev, D. E.; Bondar, A.; Bragin, A.V.; Eidelman, S.; Epifanov, D.; Epshteyn, L.B.; Erofeev, A.L.; Fedotovich, G. V.; Gayazov, S.E.; Grebenuk, A.A.; Gribanov, S.S.; Grigoriev, D.N.; Ignatov, F.V.; Иванов, В. Л.; Karpov, S. V.; Казанин, В. Ф.; Koop, I. A.; Kirpotin, A. N.; Korobov, A.; Kozyrev, Aleksei; Kozyrev, E. A.; Krokovny, P.; Kuzmenko, A.E.; Kuzmin, A.; Logashenko, I.B.; Lukin, P.; Mikhailov, K.; Okhapkin, V.S.; Otboev, A.V.; Pestov, Y.; Попов, А. С.; Razuvaev, G.P.; Рубан, А.А.; Ryskulov, N.M.; Ryzhenenkov, A.E.; Senchenko, A. I.; Shatunov, Yu. M.; Shatunov, P. Yu.; Shebalin, V.; Shemyakin, D.N.; Shwartz, B.; Shwartz, D. B.; Sibidanov, A.; Solodov, E. P.; Talyshev, A.; Титов, В.М.; Толмачев, С. С.; Воробйов, А.І.; Zemlyansky, I. M.; Yudin, Yu.V.

doi:10.1016/j.physletb.2019.05.032

Cited by 36 publications

(38 citation statements)

References 38 publications

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“…In the new detail scan the CMD-3 confirmed observed earlier [24] fast drop of the e + e − → 3(π + π − ) cross section at the NN production threshold as seen in Fig. 7 [25]. It was found that one more channel shows similar behaviour -e + e − → K + K − π + π − as seen in Fig.…”

Section: Other Hadronic Channelssupporting

confidence: 75%

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Experimental input from $e^+e^-$ machines to hadronic contribution to muon (g-2)

Ачасов

Akhmetshin

Amirkhanov

et al. 2019

SciPost Phys. Proc.

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Precise study of the hadrons production in \bm{e^+e^-}𝐞+𝐞− annihilation at low energies provides important information about interactions of light quarks and spectroscopy of their bound states. These studies are especially important for theoretical calculations of the muon \bm{(g-2)}(𝐠−2) via the Standard Model because of the present difference between theoretical and experimental values exceeds three standard deviations. In this report we will discuss current status and recent results obtained by the CMD-3 experiment and will give a brief look to status of the BaBar and Belle II experiments.

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Section: Other Hadronic Channelssupporting

confidence: 75%

“…Cross section of e + e − → 3(π + π − ) process measured by CMD-3[25]. The solid line is a fit with empirical function.…”

mentioning

confidence: 99%

Experimental input from $e^+e^-$ machines to hadronic contribution to muon (g-2)

Ачасов

Akhmetshin

Amirkhanov

et al. 2019

SciPost Phys. Proc.

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“…Generalized FF as a function of the four-momentum q 2 . The data are from CMD-3[23] (red stars), BaBar[16,21] (black circles), BESIII[19] (blue squares), and[18] (green triangles). They are shown together with the six-parameter fit from[22] compared to the fit from[20] (red dashed line).…”

mentioning

confidence: 99%

Dynamical Properties of Baryons

2021

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The internal structure of composite particles is conveniently described in terms of form factors (FFs)—these are experimentally accessible in annihilation and scattering of elementary reactions, and are theoretically calculable by all models that describe the properties of particles. FFs depend only on one kinematical variable, q2. This is the four-momentum transferred by the virtual photon that carries the interaction. Important developments in accelerator and detector techniques have brought impressive advances, both by extending the kinematical region and by reaching a higher precision. A critical review on the underlying methods and findings in polarized and unpolarized experiments is presented. The unique role played by polarization in determining the ratio of electric to magnetic form factors in the space-like region, and the extraction of individual form factors in the whole kinematical region, are described. Recent results at electron accelerators and electron–positron colliders confirm the existence of periodical structure in the annihilation cross section. We suggest a global framework which describes the dynamical structure of charge distribution in baryons, in order to build a coherent view of the creation and annihilation of baryonic matter.

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“…Space-like proton form factors have been measured with very high precision in many experiments [ 22 , 23 ]. In the time-like region, there have been a few measurements of G eff by DM2 [ 24 , 25 ], E760 [ 26 ], PS170 [ 27 ], FENICE [ 28 ], E835 [ 29 , 30 ], BaBar [ 31 , 32 ] and CMD-3 [ 33 , 34 ], but these have relatively poor precision and mutual agreement. For the | G E / G M | ratio, the measurements were rare and there is a long-time tension between PS170 and BaBar.…”

Section: Baryon Form Factor Measurements At Besiiimentioning

confidence: 99%

Probing the internal structure of baryons

Huang

Ferroli

2021

National Science Review

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Electromagnetic form factors are fundamental observables that describe the electric and magnetic structure of hadrons and provide keys to understand the strong interaction. At the Beijing Spectrometer (BESIII), form factors have been measured for different baryons in the time-like region for the first time or with the best precision. The results are presented with examples focus on but not limited to the proton/neutron, the Λ, with a strange quark, and the Λc, with a charm quark.

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Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold

Abstract: A study of hadron production at the nucleon-antinucleon threshold has been performed with the CMD-3 detector at the VEPP-2000 e + e − collider. The very fast rise with about 1 MeV width has been observed in the e + e − →

Cited by 36 publications

References 38 publications

Experimental input from $e^+e^-$ machines to hadronic contribution to muon (g-2)

Experimental input from $e^+e^-$ machines to hadronic contribution to muon (g-2)

Dynamical Properties of Baryons

Probing the internal structure of baryons

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Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold

Abstract: A study of hadron production at the nucleon-antinucleon threshold has been performed with the CMD-3 detector at the VEPP-2000 e + e − collider. The very fast rise with about 1 MeV width has been observed in the e + e − →

Cited by 36 publications

References 38 publications

Experimental input from $e^+e^-$ machines to hadronic contribution to muon (g-2)

Experimental input from $e^+e^-$ machines to hadronic contribution to muon (g-2)

Dynamical Properties of Baryons

Probing the internal structure of baryons

Contact Info

Product

Resources

About

Observation of a fine structure in e+e− → hadrons production at the nucleon-antinucleon threshold