Recent results from SND detector

Ачасов, М. Н.; Barnyakov, A.; Beloborodov, K.; Berdyugin, A. V.; Богданчиков, А. Г.; Botov, A. A.; Dimova, T.; Голубев, В. Б.; Kardapoltsev, L.; Kharlamov, A. G.; Koop, I. A.; Korol, A. A.; Koshuba, S. V.; Kovrizhin, D. P.; Kupich, A.; Martin, K. A.; Obrazovsky, A. E.; Пахтусова, Е. В.; Rogozina, E. V.; Serednyakov, S. I.; Shatunov, Yu. M.; Shtol, D.; Силагадзе, З. К.; Surin, I. K.; Usov, Y.; Vasiljev, A. V.

doi:10.1063/1.4949392

Cited by 19 publications

(38 citation statements)

References 17 publications

Supporting

Mentioning

Contrasting

Order By: Relevance

“…[10,11,12,13] the "dip" is due to the strong interaction in virtual nucleon-antinucleon (NN ) production, and is related to the fast rise of the e + e − → NN cross section and NN annihilation to hadrons. This hypothesis is supported by the fast increase of the pp [14,15] and nn [16] form factors near threshold, and explains a similar drop in the η ′ (958)π + π − spectrum, observed by the BES-III Collaboration in the J/ψ → η ′ (958)π + π − γ decay [17]. The authors of Ref.…”

Section: Introductionsupporting

confidence: 52%

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

et al. 2019

View full text Add to dashboard Cite

show abstract

Section: Introductionsupporting

confidence: 52%

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

et al. 2019

View full text Add to dashboard Cite

show abstract

“…Therefore, it would be crucial that a number of data points at large Q 2 were measured for the e + e − → e + e − A cross-section. An interesting and complementary study would be to address the the e + e − → f 1 production, that has been recently measured by SND Collaboration [88]. Finally, it might also be interesting to study the sum rules as discussed in [66].…”

Section: Discussionmentioning

confidence: 99%

Axial-vector exchange contribution to the hadronic light-by-light piece of the muon anomalous magnetic moment

2020

View full text Add to dashboard Cite

In this work we study the axial contributions to the hadronic light-by-light piece of the muon anomalous magnetic moment using the framework of resonance chiral theory. As a result, we obtain a HLbL;A µ = 0.8 +3.5 −0.8 · 10 −11 , that might suggest a smaller value than most recent calculations, underlining the need of future work along this direction. In particular, we find that our results depend critically on the asymptotic behavior of the form factors, and as such, emphasizes the relevance of future experiments for large photon virtualities. In addition, we present general results regarding the involved axial form factors description, comprehensively examining (and relating) the current approaches, that shall be of general interest. 1 arXiv:1910.02881v2 [hep-ph] 9 Dec 2019 1.2 Axial-vector contributions to the muon anomalous magnetic moment Although the Landau-Yang theorem [64,65] forbids the annihilation of a spin-one particle into a pair of real photons, axial-vector exchange contributions to the HLbL piece of a µ are still possible, since at least one photon is off-shell in both axial-γ * -γ * vertices in such a contribution. Still, the Landau-Yang theorem imposes non-trivial requirements on the symmetry structure of the involved form factors, as we will see.Early estimates of the corresponding contributions were carried out both in the extended Nambu-Jona-Lasino model by Bijnens, and by Hayakawa, Kinoshita and Sanda using Hidden Local Symmetry Lagrangians [38,39]. The first group obtained a HLbL;A µ = (2.5 ± 1.0) · 10 −11 , which includes the ballpark value 1.7 · 10 −11 , given by the second group. Melnikov and Vainshtein [45] derived operator product expansion (OPE) constraints on the hadronic light-by-light (HLbL) tensor and built a model where these were saturated by dropping 2 This arises from a SM µ = 1.16591783(35) [15], a SM µ = 1.16591820.4(35.6) [16], a SM µ = 1.16591830(48) [15]. 3 Remarkable progress in the evaluation of the HLbL part of aµ on the lattice has been achieved recently [60-62], as well (see Ref.[63] for a review on this topic).

show abstract

“…In this paper we begin to study the e + e − → π 0 γ process in experiments at the VEPP-2000 e + e − -collider [1]. The previous most accurate measurements of this process were performed in experiments at the VEPP-2M e + e − collider with the SND [2][3][4] and CMD-2 [5] detectors.…”

Section: Introductionmentioning

confidence: 99%

Measurement of the e+e−→π0γ cross section in the energy range 1.075–2 GeV at SND

Ачасов¹,

Barnyakov²,

Beloborodov³

et al. 2018

Phys. Rev. D

View full text Add to dashboard Cite

show abstract

Recent results from SND detector

Cited by 19 publications

References 17 publications

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

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

Axial-vector exchange contribution to the hadronic light-by-light piece of the muon anomalous magnetic moment

Measurement of the e+e−→π0γ cross section in the energy range 1.075–2 GeV at SND

Contact Info

Product

Resources

About

Recent results from SND detector

Cited by 19 publications

References 17 publications

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

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

Axial-vector exchange contribution to the hadronic light-by-light piece of the muon anomalous magnetic moment

Measurement of the e+e−→π0γ cross section in the energy range 1.075–2 GeV at SND

Contact Info

Product

Resources

About

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

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