Experimental input from $e^+e^-$ machines to hadronic contribution to muon (g-2) M. N. Achasov, R. R. Akhmetshin, A. N. Amirkhanov, A. V. Anisenkov, V. M. Aulchenko, V. Sh. Banzarov, A. Yu. Barnyakov, N. S. Bashtovoy, K. I. Beloborodov, A. V. Berdyugin, D. E. Berkaev, A. G. Bogdanchikov, A. E. Bondar, A. A. Botov, A. V. Bragin, T. V. Dimova, V. P. Druzhinin, S. I. Eidelman, D. A. Epifanov, L. B. Epshteyn, A. L. Erofeev, G. V. Fedotovich, S. E. Gayazov, V. B. Golubev, A. A. Grebenuk, S. S. Gribanov, D. N. Grigoriev, F. V. Ignatov, V. L. Ivanov, L. V. Kardapoltsev, S. V. Karpov, V. F. Kazanin, A. G. Kharlamov, A. N. Kirpotin, I. A. Koop, A. A. Korol, A. A. Korobov, S. V. Koshuba, A. N. Kozyrev, E. A. Kozyrev, D. P. Kovrizhin, P. P. Krokovny, A. S. Kupich, A. E. Kuzmenko, A. S. Kuzmin, R. A. Litvinov, I. B. Logashenko, P. A. Lukin, K. A. Martin, N. A. Melnikova, K. Yu. Mikhailov, A. E. Obrazovsky, V. S. Okhapkin, A. V. Otboev, E. V. Pakhtusova, Yu. N. Pestov, A. S. Popov, K. V. Pugachev, G. P. Razuvaev, A. A. Ruban, N. M. Ryskulov, A. E. Ryzhenenkov, A. I. Senchenko, S. I. Serednyakov, Yu. M. Shatunov, P. Yu. Shatunov, V. E. Shebalin, D. N. Shemyakin, D. A. Shtol, B. A. Shwartz, D. B. Shwartz, A. L. Sibidanov, Z. K. Silagadze, E. P. Solodov, I. K. Surin, A. A. Talyshev, V. M. Titov, S. S. Tolmachev, A. I. Vorobiov, I. M. Zemlyansky, Yu. V. Yudin
SciPost physics proceedings,
02/2019
1
Journal Article
Recenzirano
Odprti dostop
Precise study of the hadrons production in $e^+e^-$ 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 $(g-2)$ 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.
The process
e
+
e
−
→
K
+
K
−
π
0
has been studied in the center-of-mass energy range from 1.2 to 2 GeV using a 80.6 pb
−1
data sample collected with the CMD-3 detector at the electron-positron ...collider VEPP-2000. Preliminary results of the cross-section measurement are presented.
Preliminary results of the first experiments at the new VEPP-2000 e+e− collider are presented. The experiments have been carried out in the center of mass energy range 1–2 GeV with instant luminosity ...1030–1031cm−2s−1 and total integrated luminosity of about 10pb−1. The main e+e− annihilation cross sections, π+π−π0π0,π+π−π0,π0π0γ,andπ+π−η, have been measured. The cross section of nucleon–antinucleon production is also presented.
Recent results on various cross sections of e+e−→hadrons obtained with the SND and CMD3 detectors at the VEPP-2000 collider in the energy range up to 2 GeV are presented. The final states studied ...include e+e−→π+π−, K+K−, π+π−π0, π+π−π0π0, ηπ+π−, ωη, ηγ and others. The measured cross sections are important since they contribute to the total hadronic cross section, muon g-2 and parameters of excited vector mesons. The nucleon-antinucleon production at threshold was also studied.
The conversion decays
φ→
ηe
+
e
− and
η→
γe
+
e
− were studied by the SND detector using
φ-meson production in
e
+
e
−-annihilation at VEPP-2M collider. The branching ratios of these decays were ...measured:
Br(
φ→
ηe
+
e
−)=(1.19±0.19±0.07)×10
−4 and
Br(
η→
γe
+
e
−)=(5.15±0.62±0.39)×10
−3. The
e
+
e
−-pair mass spectra and transition form factors were also studied.
Self-polarizing electron ring for eRHIC project Otboev, A.V.; Shatunov, Yu.M.; Ptitsyn, V.
Nuclear instruments & methods in physics research. Section A, Accelerators, spectrometers, detectors and associated equipment,
01/2005, Letnik:
536, Številka:
3
Journal Article
Recenzirano
We present the electron storage ring for an arrangement of electron–proton and electron–ion collisions at RHIC. High degree of radiative electron polarization will be achieved at the beam energy ...range 5–10
GeV with characteristic time about 10
min. Required luminosity of polarized e–p collisions for studies of deep inelastic scattering is 1×10
33
cm
−2
s
−1 in the SCM energy range 15–100
GeV.
The cross section of the process \(e^+e^-\to\pi^+\pi^-\) has been measured in the center-of-mass energy range from 0.32 to 1.2 GeV with the CMD-3 detector at the electron-positron collider VEPP-2000. ...The measurement is based on an integrated luminosity of about 88 pb\(^{-1}\), of which 62 pb\(^{-1}\) represent a complete dataset collected by CMD-3 at center-of-mass energies below 1 GeV. In the dominant region near the \(\rho\) resonance a systematic uncertainty of 0.7% was achieved. The implications of the presented results for the evaluation of the hadronic contribution to the anomalous magnetic moment of the muon are discussed.
The electron–ion scattering experiment ELISe is part of the installations envisaged at the new experimental storage ring at the International Facility for Antiproton and Ion Research (FAIR) in ...Darmstadt, Germany. It offers an unique opportunity to use electrons as probe in investigations of the structure of exotic nuclei. The conceptual design and the scientific challenges of ELISe are presented.
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