Physics at VEPP-2000

doi:10.1016/j.nuclphysbps.2006.09.122

Nuclear Physics B - Proceedings Supplements

Volume 162, December 2006, Pages 323-326

https://doi.org/10.1016/j.nuclphysbps.2006.09.122 Get rights and content

Physical problems to be studied at the VEPP-2000 $e^{+} e^{-}$ collider now under construction in Novosibirsk are discussed.

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Cited by (23)

Barrel calorimeter of the CMD-3 detector
2013, Nuclear Instruments and Methods in Physics Research, Section A: Accelerators, Spectrometers, Detectors and Associated Equipment
Since 2010 the CMD-3 detector has been collecting data at the $e^{+} e^{-}$ collider VEPP-2000 at Budker Institute of Nuclear Physics. CMD-3 is a general purpose detector designed to study $e^{+} e^{-}$ annihilation into hadrons in the wide energy range $\sqrt{s} = 0.3 - 2 GeV$ . The CMD-3 barrel electromagnetic calorimeter consists of two subsystems: closest to the beam pipe is the Liquid Xenon calorimeter and the outer one is based on CsI scintillation crystals. The design of the calorimeter and its current performance are presented.
The muon g - 2
2009, Physics Reports
The muon anomalous magnetic moment is one of the most precisely measured quantities in particle physics. In a recent experiment at Brookhaven it has been measured with a remarkable 14-fold improvement of the previous CERN experiment reaching a precision of 0.54 ppm. Since the first results were published, a persistent “discrepancy” between theory and experiment of about 3 standard deviations is observed. It is the largest “established” deviation from the Standard Model seen in a “clean” electroweak observable and thus could be a hint for New Physics to be around the corner. This deviation triggered numerous speculations about the possible origin of the “missing piece” and the increased experimental precision animated a multitude of new theoretical efforts which lead to a substantial improvement of the prediction of the muon anomaly $a_{μ} = (g_{μ} - 2) / 2$ . The dominating uncertainty of the prediction, caused by strong interaction effects, could be reduced substantially, due to new hadronic cross section measurements in electron-positron annihilation at low energies. Also the recent electron $g - 2$ measurement at Harvard contributes substantially to progress in this field, as it allows for a much more precise determination of the fine structure constant $α$ as well as a cross check of the status of our theoretical understanding.
In this report we review the theory of the anomalous magnetic moments of the electron and the muon. After an introduction and a brief description of the principle of the muon $g - 2$ experiment, we present a review of the status of the theoretical prediction and in particular discuss the role of the hadronic vacuum polarization effects and the hadronic light-by-light scattering correction, including a new evaluation of the dominant pion-exchange contribution. In the end, we find a 3.2 standard deviation discrepancy between experiment and Standard Model prediction. We also present a number of examples of how extensions of the electroweak Standard Model would change the theoretical prediction of the muon anomaly $a_{μ}$ . Perspectives for future developments in experiment and theory are briefly discussed and critically assessed. The muon $g - 2$ will remain one of the hot topics for further investigations.
Muon g - 2 update
2008, Nuclear Physics B - Proceedings Supplements
We present an update of the theoretical prediction of the muon $g - 2$ . Mainly new BaBar data and a new measurement of $σ^{π π}$ by KLOE required a new update of the hadronic contribution, although no substantial change of previous estimates results. We also include a new calculation of the hadronic light-by-light contribution in the large-N_c framework. We find $a_{μ}^{the} = 116591795.4 (65.2)$ or $a_{μ}^{the} - a_{μ}^{\exp} = - 284.6 \pm 90.7 (3.1 σ)$ . The new measurement of the τ spectral–function by Belle confirms the pattern of deviations observed between $e^{+} e^{-}$ – and isospin rotated and corrected τ–data.
The running fine structure constant α (E) via the Adler function
2008, Nuclear Physics B - Proceedings Supplements
We present an up-to-date analysis for a precise determination of the effective fine structure constant and discuss the prospects for future improvements. We advocate to use a determination monitored by the Adler function which allows us to exploit perturbative QCD in an optimal well controlled way. Together with a long term program of hadronic cross section measurements at energies up to a few GeV, a determination of $α (M_{Z})$ at a precision comparable to the one of the Z mass $M_{Z}$ should be feasible. Presently $α (E)$ at $E > 1 GeV$ is the least precisely known of the fundamental parameters of the SM. Since, in spite of substantial progress due to new BaBar exclusive data, the region 1.4 to 2.4 GeV remains the most problematic one a major step in the reduction of the uncertainties are expected from VEPP-2000 [B. Khazin, these proceedings; S. Eidelman, Nucl. Phys. Proc. Suppl. 162 (2006) 323] and from a possible “high-energy” option DAFNE-2 at Frascati [P. Raimondi, these proceedings; G. Venanzoni, Acta Phys. Polon. B 38 (2007) 3421; F. Ambrosino et al., Eur. Phys. J. C 50 (2007) 729]. The up-to-date evaluation reads $Δ α_{had}^{(5)} (M_{Z}^{2}) = 0.027515 \pm 0.000149$ or $α^{−1} (M_{Z}^{2}) = 128.957 \pm 0.020$ .
Measurement of the e+e− → π+π− cross section from threshold to 1.2 GeV with the CMD-3 detector
2023, arXiv
Leading and Next-to-Leading Logarithmic Approximations in Quantum Electrodynamics
2019, Physics of Particles and Nuclei

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Nuclear Physics B - Proceedings Supplements

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Cited by (23)

Barrel calorimeter of the CMD-3 detector

The muon g - 2

Muon g - 2 update

The running fine structure constant α (E) via the Adler function

Measurement of the e<sup>+</sup>e<sup>−</sup> → π<sup>+</sup>π<sup>−</sup> cross section from threshold to 1.2 GeV with the CMD-3 detector

Leading and Next-to-Leading Logarithmic Approximations in Quantum Electrodynamics