The longitudinal target-spin asymmetry ${A}_{\mathrm{UL}}$ for the exclusive electroproduction of high-energy photons was measured for the first time in $e\stackrel{\ensuremath{\rightarrow}}{p}\ensuremath{\rightarrow}{e}^{\ensuremath{'}}p\ensuremath{\gamma}$. The data have been accumulated at JLab with the CLAS spectrometer using 5.7 GeV electrons and a longitudinally polarized ${\mathrm{NH}}_{3}$ target. A significant azimuthal angular dependence was observed, resulting from the interference of the deeply virtual Compton scattering and Bethe-Heitler processes. The amplitude of the $\mathrm{sin}\ensuremath{\phi}$ moment is $0.252\ifmmode\pm\else\textpm\fi{}{0.042}^{\mathrm{stat}}\ifmmode\pm\else\textpm\fi{}{0.020}^{\mathrm{sys}}$. Theoretical calculations are in good agreement with the magnitude and the kinematic dependence of the target-spin asymmetry, which is sensitive to the generalized parton distributions $\stackrel{\texttildelow{}}{H}$ and $H$.

Virtual particle

10.1103/physrevlett.97.072002

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Citations (109)

Precise measurements of the hadronic cross sections with the CMD-3 and SND detectors at the VEPP-2000e⁺e⁻collider

EPJ Web of Conferences (2014)

М. Н. Ачасов R.R. Akhmetshin A. V. Anisenkov V.M. Aulchenko V.Sh. Banzarov

It’s good known the difference in 3.5 sigma between the muon (g – 2) experimental result and its calculation in Standard Model. To clarify this intriguing discrepancy the new stage of muon (g – 2) measurement is under preparation at Fermi National Laboratory. On other hand, regular data taking for measurements of hadron cross section production in e+ e− annihilations is under way since December 2010 at the electron-positron collider VEPP-2000 with the CMD-3 and SND detectors. The collected data sample corresponds to about 60 inverse picobarns of integrated luminosity per detector in the energy range from 0.32 up to 2 GeV. Preliminary analysis of various hadronic cross sections has been performed.

Sigma

Electron–positron annihilation

10.1051/epjconf/20147100121

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Study of ϕ→π+π−π0 with CMD-2 detector

Physics Letters B (2006)

R.R. Akhmetshin V.M. Aulchenko V.Sh. Banzarov Л.М. Барков N.S. Bashtovoy

The cross section of the process e+e−→π+π−π0 has been measured in the c.m. energy range 984–1060 MeV with the CMD-2 detector at the VEPP-2M collider. The obtained value of Br(ϕ→e+e−)Br(ϕ→π+π−π0)=(4.51±0.16±0.11)×10−5 is in good agreement with the previous measurements and has the best accuracy. Analysis of the Dalitz plot was performed. The contributions of the dominant ϕ→ρπ mechanism as well as of a small direct ϕ→3π amplitude were determined.

Dalitz plot

10.1016/j.physletb.2006.09.041

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Citations (58)

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

SciPost Physics Proceedings (2019)

М. Н. Ачасов R.R. Akhmetshin Artem Amirkhanov A. V. Anisenkov V.M. Aulchenko

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.

10.21468/scipostphysproc.1.034

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Table 4 ; Electroproduction of phi(1020) mesons at 1.4

J. P. Santoro E. S. Smith M. Garc con M. Guidal J. M. Laget

Table (database)

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Electroproduction of phi(1020) mesons at 1.4

J. P. Santoro E. S. Smith M. Garc con M. Guidal J. M. Laget

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Study of the process e+e−→K0LK0S in the c.m. energy range 1.05–1.38 GeV with CMD-2

Physics Letters B (2002)

R.R. Akhmetshin V.M. Aulchenko V.Sh. Banzarov Л.М. Барков S.E. Baru

The process $e^+e^- \to K^0_L K^0_S$ has been studied with the CMD-2 detector using about 950 events detected in the center-of-mass energy range from 1.05 to 1.38 GeV. The cross section exceeds the expectation based on the contributions of the rho(770), omega(782) and phi(1020) mesons only.

Electron–positron annihilation

10.1016/s0370-2693(02)02985-4

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Citations (41)

Measurement of the pion form factor in the range 1.04–1.38 GeV with the CMD-2 detector

JETP Letters (2005)

V. Aulchenko R.R. Akhmetshin V.Sh. Banzarov Л.М. Барков N. S. Bashtovoĭ

Form factor (electronics)

Electron–positron annihilation

10.1134/1.2175241

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Citations (98)

Hadronic cross sections with the CMD-3 detector at the VEPP-2000

Nuclear and Particle Physics Proceedings (2018)

R.R. Akhmetshin Artem Amirkhanov A. V. Anisenkov V.M. Aulchenko V.Sh. Banzarov

Electron–positron annihilation

10.1016/j.nuclphysbps.2018.03.019

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Tensor Correlations Measured in 3 Heðe;e 0 ppÞn

H. Baghdasaryan L. B. Weinstein M. Aghasyan M. Amarian M. Anghinolfi

H. Baghdasaryan,* L. B. Weinstein, J.M. Laget, K. P. Adhikari, M. Aghasyan, M. Amarian, M. Anghinolfi, H. Avakian, J. Ball, M. Battaglieri, I. Bedlinskiy, R. P. Bennett, B. L. Berman, A. S. Biselli, C. Bookwalter, W. J. Briscoe, W.K. Brooks, S. Bultmann, V.D. Burkert, D. S. Carman, V. Crede, A. D’Angelo, A. Daniel, N. Dashyan, R. De Vita, E. De Sanctis, A. Deur, B. Dey, R. Dickson, C. Djalali, G. E. Dodge, D. Doughty, R. Dupre, H. Egiyan, A. El Alaoui, L. El Fassi, P. Eugenio, S. Fegan, M.Y. Gabrielyan, G. P. Gilfoyle, K. L. Giovanetti, W. Gohn, R.W. Gothe, K. A. Griffioen, M. Guidal, L. Guo, V. Gyurjyan, H. Hakobyan, C. Hanretty, C. E. Hyde, K. Hicks, M. Holtrop, Y. Ilieva, D. G. Ireland, K. Joo, D. Keller, M. Khandaker, P. Khetarpal, A. Kim, W. Kim, A. Klein, F. J. Klein, P. Konczykowski, V. Kubarovsky, S. E. Kuhn, S. V. Kuleshov, V. Kuznetsov, N.D. Kvaltine, K. Livingston, H. Y. Lu, I. J. D. MacGregor, N. Markov, M. Mayer, J. McAndrew, B. McKinnon, C. A. Meyer, K. Mikhailov, V. Mokeev, B. Moreno, K. Moriya, B. Morrison, H. Moutarde, E. Munevar, P. Nadel-Turonski, C. Nepali, S. Niccolai, G. Niculescu, I. Niculescu, M. Osipenko, A. I. Ostrovidov, R. Paremuzyan, K. Park, S. Park, E. Pasyuk, S. Anefalos Pereira, S. Pisano, O. Pogorelko, S. Pozdniakov, J.W. Price, S. Procureur, D. Protopopescu, G. Ricco, M. Ripani, G. Rosner, P. Rossi, F. Sabatie, C. Salgado, R. A. Schumacher, H. Seraydaryan, G.D. Smith, D. I. Sober, D. Sokhan, S. S. Stepanyan, S. Stepanyan, P. Stoler, S. Strauch, M. Taiuti, W. Tang, C. E. Taylor, D. J. Tedeschi, M. Ungaro, M. F. Vineyard, E. Voutier, D. P. Watts, D. P. Weygand, M.H. Wood, B. Zhao, and Z.W. Zhao

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